Caterpillartrack-type tractor
Caterpillar D6R
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar D6R is a medium track-type tractor (bulldozer) in the roughly 18–20.5 tonne (40,400–45,200 lb) class, introduced in 1996 as the successor to the D6H. It pairs a six-cylinder Cat diesel with an electronically controlled powershift transmission and differential steering, delivering three speeds forward and reverse. Early Series I machines ran the mechanically governed Cat 3306T; later builds moved to the 3306 ATAAC and then the electronic C9 and C9 ACERT, rated from about 123 kW (165 hp) up to 149 kW (200 hp) net depending on series and configuration. It was offered as standard (STD), XL, XW, and low-ground-pressure LGP — the LGP carrying wider shoes for roughly 34 kPa (5 psi) ground pressure — and sits squarely in the D6H → D6R → D6T lineage, with the D6T phasing it out around 2004–2008.
Across its production run the D6R evolved through three series, and the differences matter to anyone buying or servicing one. Series I (about 1996–2001) used the 3306T; Series II (about 2001–2005) kept the 3306 (ATAAC) on the standard machine while shifting XL/XW/LGP builds to the electronic C9; Series III (about 2005–2008) standardized on the C9 ACERT, adding cleaner combustion, higher gross output (roughly 213 hp on the STD and 228 hp on the uprated configurations) and updated electronics. Because the platform was built in large numbers and is simple and rebuildable, the D6R remains one of the most heavily traded medium dozers on the used market. That longevity sustains steady demand for undercarriage, powertrain, blade, and 3306/C9 engine parts — and makes correct series and configuration identification essential, since a Series I 3306T machine and a Series III C9 ACERT machine wear the same badge but share very few service parts.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Caterpillar D6R specifications
Engine
| Engine family by series | Series I: Cat 3306T, 10.5 L inline-6, mechanical unit injection · Series II: Cat C9, 8.8 L, HEUI · Series III: Cat C9 ACERT, 8.8 L, HEUI multi-injection |
| Net power (ISO 9249) | Series I: 123–138 kW (165–185 hp) by configuration · Series II: 130–149 kW (175–200 hp) band — varies by configuration and rating convention · Series III: 138 kW (185 hp) STD, 149 kW (200 hp) XL/XW/LGP/VPAT |
| Bore × stroke | 3306T: ≈121 mm × 152 mm (4.75–4.8 × 6.0 in) · C9/C9 ACERT: 112 mm × 149 mm (4.4 × 5.9 in) |
| Emissions | Series III (C9 ACERT): US EPA Tier 2 / EU Stage II / China Stage 2. No derate to 2,286 m (7,500 ft); max operating altitude 3,048 m (10,000 ft) |
Weights
| Operating weight — Series II/III | 18,325–23,051 kg (40,400–50,818 lb) across STD SU-blade to LGP VPAT configurations |
| Operating weight — Series I (secondary sources) | 18,145–20,502 kg (40,000–45,200 lb): STD 18,145 · XL/XR 19,187 · IG 19,731 · LGP 20,502 kg |
| Shipping weight (no blade/ripper, 10% fuel) | 14,708–19,044 kg (32,426–41,985 lb) by configuration |
| Ground pressure (standard shoes) | 0.36–0.66 kg/cm² (5.15–9.36 psi): STD 8.74 psi · XL 8.90 · XW 6.72 · LGP S-blade 5.15 psi |
Dimensions
| Track gauge | 1,880 mm (74 in) STD/XL · 2,032 mm (80 in) XW · 2,286 mm (90 in) LGP |
| Width over standard track | 2,440 mm (96 in) STD/XL · 2,794 mm (110 in) XW · 3,193 mm (125.7 in) LGP |
| Height to ROPS | 3,195 mm (125.8 in); 3,245 mm (127.8 in) LGP |
| Length, basic tractor | 3,860 mm (152 in); 4,247 mm (167.2 in) LGP. Blade adds 1,043–1,718 mm; ripper adds 1,403 mm |
| Track on ground | 2,664 mm (104.9 in) STD · 2,871 mm (113 in) XL/XW · 3,275 mm (128.9 in) LGP |
| Ground clearance | 383 mm (15.1 in); 433 mm (17 in) LGP |
| Standard shoe width | 560 mm (22 in) STD/XL · 760 mm (30 in) XW · 915 mm (36 in) LGP (810 mm/32 in on LGP-VPAT) |
Performance & hydraulics
| Travel speeds (3F/3R powershift) | Forward: 3.8 / 6.6 / 11.5 km/h (2.3/4.1/7.1 mph) · Reverse: 4.8 / 8.4 / 14.6 km/h (3.0/5.2/9.1 mph) — both OEM Specalogs agree exactly |
| Drawbar pull (from published curve, approximate) | ≈342 kN (77,000 lbf) 1st gear · ≈187 kN (42,000 lbf) 2nd · ≈102 kN (23,000 lbf) 3rd |
| Gradeability | Not published by Cat for the D6R — grade performance is expressed via the drawbar-pull-vs-speed curve and ground pressure, not a headline percentage |
| Hydraulic pump output | 214–217 L/min (56.5–57.3 gal/min) at 2,125 rpm rated speed |
| Relief pressures | Main relief 42,000 kPa (6,092 psi) · implement circuits (blade/tilt/ripper) 19,300 kPa (2,799 psi) · steering 40,000 kPa (5,802 psi) |
Blades & ripper
| Blade families | S (straight), SU (semi-universal), A (angle, twin tilt cylinders); VPAT (variable pitch angle tilt) from Series III on XL/XW/LGP |
| Blade capacities (SAE J1265) | 3.75–5.62 m³ (4.90–7.35 yd³): SU highest at 5.61–5.62 m³; VPAT 4.32–5.10 m³ |
| Blade widths | 3,260 mm (10.7 ft) SU to 4,200 mm (13.8 ft) A-blade XW |
| Ripper | Fixed parallelogram, field-configurable 1–3 shanks. Penetration 500 mm (19.7 in) · pryout force 9,134 kgf (20,137 lbf) · 1,782 kg (3,932 lb) with 3 shanks |
Service capacities (summary)
| Fuel tank | 424 L (112 gal) Series II/III; ≈383 L (101 gal) Series I — a genuine generational change |
| Cooling system | 76.8 L (20.3 gal) |
| Engine oil | 28 L (7.4 gal) |
| Power train (transmission) | 145.7 L (38.5 gal) |
| Final drives / roller frames | 13.6 L (3.6 gal) each final drive · 24.6 L (6.5 gal) each roller frame |
| Hydraulic tank | 51.5 L (13.6 gal) — OEM-consistent across both Specalogs |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D6R fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with oil filter change) | ≈28 L (7.4 gal) across all series; a Series I base listing shows ≈27.6 L (7.3 gal). Consistent ~28 L whether the 3306/3306T (Series I), 3306 ATAAC/C9 (Series II) or C9 ACERT (Series III). | Cat DEO / DEO-ULS (Diesel Engine Oil, API CH-4/CI-4 class). Viscosity by climate: SAE 15W-40 for warm/general use (~-10 °C to 50 °C); SAE 10W-30 for cooler/moderate (~-18 °C to 40 °C); Cat DEO Cold Weather SAE 0W-40 for extreme cold (~-40 °C to 40 °C). Straight SAE 30 was an older-OMM monograde option for stable warm climates on the 3306. |
| Cooling system | Series I (3306/3306T) ≈74 L (19.6 gal); Series III (C9 ACERT) ≈70 L (18.5 gal). Overall listings span ~70–77 L — varies by series/configuration. | Cat ELC (Extended Life Coolant), typically 1:1 premix (or ELC concentrate blended ~50/50 with clean water) for freeze protection to roughly -37 °C (-34 °F). Earlier units were factory-filled with Cat DEAC (Diesel Engine Antifreeze/Coolant); do not mix ELC and conventional coolant without a full flush. |
| Fuel tank | Series I ≈383 L (101 gal); Series III ≈424 L (112 gal). Varies by series/configuration. | Clean distillate diesel meeting Cat fuel spec — ultra-low-sulfur diesel (ULSD) for later ACERT/C9 emissions hardware. Cat permits biodiesel up to B20 on ACERT-era units per the OMM; observe Cat cold-flow/cloud-point guidance in cold climates. |
| Power train — powershift transmission + torque divider + steering-differential (bevel-gear) group (common oil system) | Series I ≈155 L (41 gal); Series III ≈145.7 L (38.5 gal). Varies by series. NOTE ON THE 'SPLIT': the D6R uses differential steering in which the torque divider, 3F/3R powershift transmission and the steering-differential/bevel-gear share ONE common power-train oil supply and filter — so Cat spec sheets and the OMM give a single power-train capacity rather than separate transmission and bevel-gear fills (unlike older mechanical-steer dozers such as the D6D). One third-party oil chart cited a separate 28 L 'transmission' + 13.6 L 'bevel gear', but this could not be corroborated against a Cat OMM and appears to be a data artifact. | Cat TDTO (Transmission/Drive Train Oil) — Cat explicitly lists TDTO for powershift transmissions, clutches, brakes, bevel gears and differentials. Viscosity by climate: TDTO SAE 30 for general/warm use (~0 °C to +35 °C); TDTO SAE 10W or TDTO-TMS multigrade (~-20 °C to +43 °C) for cold; Cat TDTO Cold Weather 0W-20 (synthetic blend) for extreme cold. |
| Final drives (each — two separate planetary final drive compartments) | Series I ≈14.0 L (3.7 gal) each; Series III ≈13.6 L (3.6 gal) each. Range ~13.6–14 L per side. | Cat FDAO (Final Drive and Axle Oil) or Cat TDTO per the OMM lubrication chart. Grade by climate: heavier (TDTO/SAE 50 or FDAO 60) in high ambient heat; SAE 30 or 10W-range in cold. Cat TDTO Cold Weather 0W-20 is approved for final drives in extreme cold. |
| Hydraulic system / implement tank | Series I ≈76 L (20.1 gal); Series III ≈51.5 L (13.6 gal). Varies SIGNIFICANTLY by series and blade/implement configuration — give the range 51.5–76 L (13.6–20.1 gal) and confirm against the specific machine's OMM. | Cat HYDO Advanced 10 (SAE 10W) is the preferred fill; Cat TDTO 10W or Cat MTO are acceptable alternates. Cold: HYDO Advanced 10 or TDTO Cold Weather 0W-20 / Cat arctic hydraulic for extreme cold; use a higher-viscosity Cat TDTO SAE 30 if high ambient heat demands it. Cat BIO HYDO where environmentally required. |
| Track roller frames (each side — oil-filled undercarriage reservoir) | Series III ≈24.6 L (6.5 gal) each. Not separately itemized on all Series I/II sheets (oil-filled roller-frame undercarriage). | Cat power-train oil / Cat TDTO (SAE 30 grade typical) per the OMM roller-frame lubrication callout. Verify grade against the specific machine's OMM lubrication chart. |
| Pivot shaft compartment | Series III ≈4.9 L (1.3 gal). (Some quick summaries mis-state ~1.9 L; the 1.3 gal figure converts to 4.9 L and is the corroborated value.) | Cat TDTO / power-train oil (SAE 30 grade typical) per the OMM. Same fluid family as the roller frames. |
| Grease points (fittings — no single reservoir capacity) | No fixed volume — grease-to-purge at each fitting per the OMM greasing schedule (pins, bushings, linkage, equalizer bar, etc.). | Cat multipurpose moly grease — Cat Prime, Cat Advanced 3Moly, Cat Ultra 5Moly, or MPGM (Multi-Purpose Grease with Molybdenum), NLGI No. 2 for normal ambient; NLGI No. 1 or 0 (or Cat Arctic Platinum) for cold-climate operation. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar D6R maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 12,000 h |
|
Servicing the D6R beyond the schedule
Predictive Maintenance & Fluid Analysis
The D6R rewards disciplined S·O·S sampling. Draw scheduled oil samples from the 3306 or C9 engine at 250 hours and from the powershift transmission, hydraulic tank, and both final drives at 500 hours — the differential-steering powertrain loads its gears hard, so rising wear metals flag bevel-gear, steer-clutch, and final-drive bearing decay early. Sample the ELC coolant for nitrite depletion before adding Extender. Trending iron and silicon on a D6R exposes undercarriage-fed dirt ingress and gear wear long before a jobsite failure.
Corrective & Common Repairs
Common D6R corrective work centers on the undercarriage, hydraulics, and steering. Track chain, sprocket, roller, and idler wear drives the biggest repair spend, while blade lift and tilt cylinders develop rod-seal leaks under heavy dozing. On the powershift and differential-steering system, slow steering response or clutch slip points to worn steer clutches or low TDTO. Series I 3306 machines see fuel-transfer- and injection-pump service; C9 machines add electronic sensor and wiring faults. Renew blade cutting edges and pins before wear reaches the moldboard.
Overhaul & Rebuild Points
A high-hour D6R is a strong rebuild candidate. The 3306T, 3306 ATAAC, and later C9 are all certified-rebuild engines; plan an in-frame or full overhaul as blowby and oil consumption climb. The final drives and powershift transmission carry planetary gearsets and clutch packs that reward scheduled rebuild over run-to-failure. Undercarriage is a staged job — turn or replace bushings, then renew chain, sprockets, rollers, and idlers by wear measurement. Reseal blade and ripper cylinders and inspect the differential-steering module during any major powertrain teardown.
Seasonal & Environment Servicing
Match D6R service to its jobsite. In cold climates, run the correct cold-grade Cat DEO, confirm ELC freeze protection, and verify an ether or coolant-heater aid and a fully charged battery pack before winter. In hot, dusty land-clearing or landfill work, shorten air-cleaner and radiator-core cleaning intervals and watch hydraulic and transmission temperatures for fine-dust ingress past the seals. LGP machines on soft, wet ground need extra undercarriage cleanout and more frequent pivot-shaft and equalizer-bar lubrication to flush abrasive mud.
D6R common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 134-3589 | Film-Information | Fuel system service | Check fitment → |
| 4P-8681 | Film Identification | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D6R fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 168-04 (also 168-03) — MID 113 / MID 030 | CID 168 = Electrical System Voltage. FMI 04 = voltage below normal (FMI 03 = above normal). On the D6R this is logged when battery/system voltage sags below roughly 21.3 VDC; if it drops below ~18 VDC the machine protects itself by applying the brakes and shifting the transmission to neutral. | Charging-system fault (alternator output low, loose/corroded alternator or battery connections), weak or failing batteries, or a voltage drop in the machine harness/ground. ECM failure is possible but unlikely. | Load-test batteries and measure alternator charging output at the battery and at the ECM power pins; clean/tighten battery, ground, and alternator connections before condemning any control. |
| 096-03 — MID 030 (Cat Monitoring System) | CID 96 = Fuel Level Sensor. FMI 03 = signal voltage above normal / shorted high. Displays on the monitoring panel as '030 096 f03'. It is a monitoring-system fault, not a powertrain fault. | Fuel-level sender shorted to +battery, chafed/pinched sender wiring, or a failed/stuck sender float. Frequently seen alongside other harness codes. | Disconnect the fuel-level sender and check the sender signal wire for a short to supply; inspect the sender connector and float, then re-check for active vs logged status in Cat ET. |
| 248-02 — MID 030 / MID 113 | CID 248 = Cat Data Link. FMI 02 = data erratic, intermittent, or incorrect. Indicates the ECMs are losing communication with each other or with the monitoring system over the Cat Data Link. | Damaged or corroded data-link wiring/connectors between the transmission ECM, engine controller, and monitor; a powered-down or failing module on the link; or intermittent connector contact. | Inspect the data-link harness and connectors for the two-wire link between modules; check for a module that is not powering up. Often clears once a loose/corroded connector is reseated. |
| 299-08 (also 299-13) — MID 113 (Power Train ECM) | CID 299 = Transmission Lever / Direction-Selector Position Sensor. FMI 08 = abnormal frequency, pulse width, or period; FMI 13 = out of calibration. The ECM sees the direction/speed selector signal as out of range, so it may hold the transmission in neutral. | Faulty or misaligned selector position sensor, damaged/loose connector at the control lever, or a sensor that has lost calibration. | Inspect and reseat the selector sensor connector, verify sensor signal in Cat ET, then recalibrate the transmission control lever per procedure if the sensor checks good. |
| 671-02 / 673-02 — MID 113 (Power Train ECM) | On the D6R powertrain, CID 671 = No.1 Transmission Output Speed Sensor and CID 673 = No.2 Transmission Output Speed Sensor (674/675 = intermediate speed sensors). FMI 02 = erratic/intermittent signal. The ECM can no longer compute speed ratios and will log apparent forward/reverse clutch 'slippage'. NOTE: generic Caterpillar CID lists label 671 as 'Left Pedal Position Sensor' — on the D6R transmission it functions as the output speed sensor, so meaning varies by machine/module context. | Speed sensor dirty or with wrong air gap, metal debris on the sensor tip, damaged sensor wiring, or the output/intermediate speed-sensor connectors swapped during service (a documented cause of paired 671/673 codes). | At the rear transmission access cover, inspect/clean both speed sensors, confirm the yellow/purple sensor connectors are in their correct positions (not exchanged), and compare sensor readings by gear in Cat ET (or historically the Cat's dedicated control service tool service tool, mode 7). |
| 070-02 — MID 113 (Power Train ECM) | CID 70 = Parking Brake Switch (ON/OFF). FMI 02 = data erratic, intermittent, or incorrect. The ECM is getting an implausible or bouncing parking-brake state, which can keep the machine from moving. | Faulty or misadjusted parking-brake switch, corroded/loose switch connector, or chafed switch wiring giving an intermittent signal. | Check the parking-brake switch operation and connector, verify the switch state in Cat ET as the brake is applied/released, and repair any intermittent wiring before replacing the switch. |
| 271-06 — MID 030 / MID 113 | CID 271 = Action Alarm. FMI 06 = current above normal / grounded circuit. The alarm driver output is seeing excessive current, typically a short. | Action-alarm coil shorted, or the alarm output wire shorted to ground/chafed against the frame. | Disconnect the action alarm and check the driver circuit for a short to ground; test the alarm itself for a shorted coil. |
| 324-06 — MID 030 / MID 113 | CID 324 = Warning (Action) Lamp. FMI 06 = current above normal / grounded circuit. The dash action/warning lamp output is overloaded. | Warning-lamp circuit shorted to ground, wrong/failed bulb, or chafed lamp wiring. | Inspect the action/warning lamp bulb and its wiring for a short to ground; verify the lamp output drives correctly once the short is cleared. |
| 590-xx / event E0594 — Engine Control Module (C9 machines) | CID 590 = Engine Control Module. On the D6R this controller exists only on the C-series (C9) machines — Series II XL/XW/LGP and Series III ACERT; the Series I / STD 3306 is largely mechanical and does not generate C9-style engine ECM codes. Related transmission-oil-temp warnings surface as event codes (e.g. E594, high transmission oil temperature, ~110°C / 230°F) rather than a CID-FMI pair. | For CID 590: engine-ECM power/ground or Cat Data Link communication fault, or an internal controller issue. For the E594 event: transmission overheating (low/degraded oil, cooler or flow restriction, overload). | For a 590 comms fault, check engine-ECM power, grounds, and data-link wiring in Cat ET. For the temperature event, check transmission oil level/condition and cooling flow. Confirm the exact FMI/event on the display before parts are touched. |
| 268-02 — MID 113 / MID 030 | CID 268 = Programmed Parameter (Check Programmable Parameters) Fault. FMI 02 = erratic/incorrect. Indicates a configuration/calibration parameter in the ECM is missing, mismatched, or not set. | ECM was replaced or reflashed and required parameters/calibrations were not programmed, or a stored parameter has become corrupted. | Connect Cat ET and review/re-program the machine configuration and required calibrations for that serial number; re-check for active status after programming. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
D6R attachments & work tools
Blades (S/SU/A/PAT/VPAT)
S blade: ~3.35–3.36 m (11.0–11.02 ft) width, ~3.89 m³ (5.09 yd³) capacity, fixed angle, best penetration/visibility, general heavy dozing in hard/rocky material. SU blade: 3.27 m (10.7 ft) width, 5.7 m³ (7.34–7.4 yd³) capacity — narrower but taller/curved moldboard gives highest capacity of the fixed blades; production dozing/stockpiling. A (angling) blade: manual pin-reposition angle + hydraulic tilt, 3.78–4.18 m (12.4–13.67 ft) width depending on undercarriage width band (source disagreement flagged, likely STD vs XW variants). PAT (Series II): fully hydraulic 6-way angle+tilt, ~4.08 m (13.4 ft), 6.33–6.65 yd³ (Cat's own catalog figure). VPAT (Series III): adds hydraulic pitch on top of angle+tilt, blade stays level when angled; XL 12.73 ft/6.19 yd³, LGP ~13.65 ft/5.65 yd³. Flagged anomaly: Series III VPAT capacity reads lower than Series II PAT — possibly a measurement-standard difference (SAE 2:1 vs struck), unresolved. Blade width/capacity always scales with undercarriage (STD ~22in shoe/8.5-9psi, XW wider gauge/~9psi, LGP 36-40in shoe/~4.95-5.3psi) — confirm undercarriage before quoting a blade number. VPAT is confirmed available on D6R (not just larger dozers).
Rippers
Single family across the whole D6R lineage: fixed parallelogram ripper, 3-pocket frame, field-configurable to 1, 2, or 3 shanks (curved or straight, interchangeable on the same beam). No separate impact-ripper option exists at this weight class (impact/hammer rippers start at D8-and-up). Series III weights (cross-checked 2 sources): single-shank installed weight 1,636 kg (3,606 lb); each additional shank +74 kg (163 lb), so a full 3-shank set adds ~148 kg (326 lb) over base. Overall beam width ~2.20-2.21 m (86.7-87 in). Max penetration 500 mm (19.7 in); max clearance raised 513 mm (20.2 in); max penetration force 64.7 kN (14,557 lbf); pry-out force 89.6 kN (20,137 lbf). Contamination warning: a lighter generic 'D6' ripper spec (~1,550 kg base, 68.8 kN penetration, 126 kN pry-out) circulating online belongs to the current-generation D6/D6 XE platform (2018+), not the D6R — must not be blended in.
Winches
Two distinct winch classes fit the D6R depending on series. PA-56 (PACCAR/Carco, mechanical) fits Series I/II (and is shared across the D6G/D6H-era weight class, continuing into early D6T): drum diameter ~254 mm (10 in), drum/flange width 254-330 mm (10-13 in), single lever actuates both clutch and brake, rope 22 mm recommended/25 mm optional (max warrantable ~1 in), drum working capacity ~55 m (180 ft) of 22 mm rope, oil capacity ~67 L (17.7 gal), weight ~1,135-1,180 kg (2,502-2,600 lb, varies by source/vintage), adds ~520 mm (20.4 in) to overall tractor length when installed. H90VS (Carco, hydraulic variable-speed) fits Series III D6R only (shares an installation/parts manual with early D6T): overall reduction ratio ~255:1, powered off implement hydraulics rather than a mechanical PTO/clutch pack; full drum-capacity/line-pull tables were not resolved from public sources in this pass. Primary use case for a D6R winch is forestry/log-skidding (often paired with a logging arch to keep cable off the drum edge under off-center pull), not general construction towing — that role falls to the drawbar.
Drawbars & Counterweights
Rigid drawbar and long (extended) drawbar options, used for towing trailed implements (disks, compactors, sheepsfoot rollers) — not for logs. Drawbar height (center of clevis) from ground ~576 mm (1 ft 11 in), measured 511 mm (1 ft 8 in) from ground face of shoe (Series III figure). Rear counterweight: 781 kg (1,722 lb), recommended specifically when no other rear attachment is fitted, for balance on steep back-slope work and heavy dozing. Additional stackable counterweight slab: 342 kg (753 lb). Architectural note: ripper, winch, drawbar, and rear counterweight all occupy the same rear mounting position on this dozer class — one is fitted per job (ripper for scarifying, winch for skidding, drawbar for towing, counterweight as rear ballast if nothing else is fitted); no single Cat document was found stating this as an absolute mechanical interlock specific to the D6R, but it is the consistent practical/dealer-literature framing.
Cab/ROPS Guarding (Forestry/Waste)
Forestry Screens & Sweeps package: two side screens, two door screens, one rear screen, roof screen, complete hardware, plus front sweeps (limb/brush deflectors ahead of tracks and radiator); OEM-style sweeps accept factory parts, finished to match Cat black; optional roof panel over sweeps; package weight ~644 kg (1,420 lb) shipped. Waste Handling (WH) arrangement guarding (documented on Cat's own D6R WH product page, though against an earlier 3306-era/Series I platform — later-series WH guarding was not independently confirmed and is treated as reasonable extrapolation): impact-resistant polycarbonate cab doors (replaces door screens entirely), hinged quick-release radiator guard, tilt-cylinder line guards, full crankcase/belly guard, chassis guards deflecting debris from engine bay, pivot-shaft and idler seal guards (specifically against wire/strapping wrap-up), thicker hardened final-drive seal guards, engine enclosure with perforated hood/side panels, hydraulic and fuel tank guard, two-pass cooling system with enlarged surface area, optional AMOCS radiator, reversing (Flexxaire-type) self-purging fan, optional ROPS-mounted A/C condenser relocation away from debris zone. Base ROPS/cab: standard four-post Canopy ROPS/FOPS; optional fully enclosed, isolation-mounted, pressurized A/C cab; ROPS meets SAE J395/J1040, FOPS meets ISO 3449-1992 Level II (Series III-documented).
Hydraulic Arrangement (Front/Rear Tools)
Series II/III architecture (cross-checked, Cat's own catalog + independent spec sheet): load-sensing, variable-displacement axial-piston implement pump feeding both blade and ripper circuits via pilot-operated (low-effort) control valves, with flow apportioned on demand rather than fixed splitting between circuits. Bulldozer (blade) circuit max operating pressure 19,300 kPa (2,799 psi). Main relief valve pressure (differential-steering circuit) 42,000 kPa (6,092 psi). Pump output variable, ~80-217 L/min (21.1-57.3 gpm) depending on function/demand. Winch circuit on the Series III H90VS is hydraulically driven off the same implement system (distinct from the mechanical-clutch PA-56 used on Series I/II). Control layout: separate low-effort pilot-hydraulic levers for blade (angle/tilt/pitch depending on blade type) and ripper (raise/lower/shank selection) — not a single unified joystick across both tools; steering/direction/gear selection is on its own independent single-handle finger-tip control. Series I (3306T) implement hydraulics follow the same general variable-displacement/compensator-valve principle, but period-specific pressure/flow figures were not cross-verified to the same standard — the pressure/flow numbers given are Series II/III-representative, not confirmed universal across all three series.
All D6R assemblies by section
Every catalogued assembly group for the Caterpillar D6R. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
1009213 Air Cleaner Group
| 10***13 | Air Cleaner Group | 1 |
Air Cleaner (1009211 N/S)
| 10***11 | Air Cleaner Group; Air Cleaner Group | 1 |
Exhaust Manifold Fastener (1w4486 N/S)
| 1W***86 | Fastener Group-Exhaust Manifold; Exhaust Manifold Fastener Group | 1 |
Air Lines (1009214 N/S)
| 10***14 | Lines Group-Air; Air Lines Group | 1 |
Air Lines (1135368 N/S)
| 11***68 | Lines Group-Air | 1 |
Turbocharger Oil Lines (9y5727 N/S)
| 9Y***27 | Lines Group-Turbocharger Oil; Turbocharger Oil Lines Group | 1 |
Turbocharger Oil Lines (7e5683 N/S)
| 7E***83 | Lines Group-Turbocharger Oil | 1 |
Turbocharger Oil Lines (1865205 N/S)
| 18***05 | Lines Group-Turbocharger Oil | 1 |
Dust Ejector (4y2816 N/S)
| 4Y***16 | Dust Ejector; Dust Ejector Group | 1 |
Exhaust Manifold (6n0164 N/S)
| 6N***64 | Manifold Group-Exhaust | 1 |
Exhaust Manifold (1344208 N/S)
| 13***08 | Manifold Group-Exhaust | 1 |
Muffler (4y9541 N/S)
| 4Y***41 | Muffler | 1 |
1138315 Turbocharger Cartridge Group
| 11***15 | Turbocharger Cartridge Group | 1 |
Turbocharger (1135340 N/S)
| 11***40 | Turbocharger Group | 1 |
1137919 Turbocharger Group
| 11***19 | Turbocharger Group | 1 |
Basic Engine
Damper (1w7831 N/S)
| 1W***31 | Damper Group; Damper Group | 1 |
Fan Drive (7e5722 N/S)
| 7E***22 | Drive Group-Fan (Belt); Drive Gp-Fan (Belt) | 1 |
Flywheel (7n2729 N/S)
| 7N***29 | Flywheel Group | 1 |
Oil Level Gauge (4w4269 N/S)
| 4W***69 | Gauge Group-Oil Level (Dipstick); Gauge Gp-Oil Level (Dipstick) | 1 |
Rear Gear (7c0502 N/S)
| 7C***02 | Gear Group-Rear; Rear Gear Group | 1 |
Flywheel Housing (1w1154 N/S)
| 1W***54 | Housing Group-Flywheel | 1 |
Engine Mounting (4w5386 N/S)-Flexible
| 4W***86 | Mounting Group-Engine | 1 |
Vandalism Protection (1w1421 N/S)-Oil Level Gauge
| 1W***21 | Protection Group-Vandalism; Vandalism Protection Group -- Engine Oil Level Gage | 1 |
Engine Support (8n4422 N/S)
| 8N***22 | Support Group-Engine | 1 |
Camshaft (1n4406 N/S)-Single
| 1N***06 | Camshaft Group-Single; Camshaft Group--Single | 1 |
Cylinder Block Cover (7n1342 N/S)
| 7N***42 | Cover Group-Cylinder Block; Cylinder Block Cover Group | 1 |
Front Housing Cover (2p6528 N/S)
| 2P***28 | Cover Group-Front Housing; Front Housing Cover Group | 1 |
Valve Mechanism Cover (8n4745 N/S)
| 8N***45 | Cover Group-Valve Mechanism; Valve Mechanism Cover Group | 1 |
Crankshaft (4p9856 N/S)
| 4P***56 | Crankshaft Group | 1 |
1n3576 Cylinder Block Group
| 1N***76 | Cylinder Block Group | 1 |
Cylinder Block (8n5286 N/S)
| 8N***86 | Cylinder Block Group; Cylinder Block Group | 1 |
Cylinder Head (7n8876 N/S)
| 7N***76 | Cylinder Head Group; Cylinder Head Group | 1 |
8n6796 Cylinder Head Group
| 8N***96 | Cylinder Head Group | 1 |
Cylinder Head Fastener (7n9536 N/S)
| 7N***36 | Fastener Group-Cylinder Head; Cylindetr Head Fastener Group | 1 |
Front Housing Fastener (8n0872 N/S)
| 8N***72 | Fastener Group-Front Housing; Front Housing Fastener Group | 1 |
Oil Pan Fastener (2p6200 N/S)
| 2P***00 | Fastener Group-Oil Pan; Fastener Gp-Engine Oil Pan | 1 |
Front Timing Gear (1118001 N/S)
| 11***01 | Gear Group-Front | 1 |
Front Housing (8n0303 N/S)
| 8N***03 | Housing Group-Front; Front Housing Group | 1 |
Engine Lifting (6n8326 N/S)
| 6N***26 | Lifting Group; Lifting Eye Gp-Engine | 1 |
Alternator Mounting (2w0176 N/S)
| 2W***76 | Mounting Group-Alternator | 1 |
Oil Pan (2p6152 N/S)
| 2P***52 | Pan Group-Oil; Oil Pan Group | 1 |
Connecting Rod And Piston (1w6588 N/S)-6 Required
| 1W***88 | Piston & Rod Group; Connecting Rod And Piston Group | 1 |
Connecting Rod And Piston (1w6588)-6 Required
| 1W***88 | Piston & Rod Group; Connecting Rod And Piston Group | 1 |
Pulley (1080083 N/S)
| 10***83 | Pulley Group-Alternator | 1 |
Crankshaft Pulley (1095176 N/S)
| 10***76 | Pulley Group-Crankshaft | 1 |
Crankshaft Seal (2p6226 N/S)
| 2P***26 | Seal Group-Crankshaft; Seal Group-Crankshaft | 1 |
Engine Trunnion (8n0107 N/S)
| 8N***07 | Trunnion Group-Engine; Engine Trunnion Group | 1 |
Valve Mechanism (7n8026 N/S)
| 7N***26 | Valve Mechanism Group; Valve Mechanism Group | 1 |
Cooling System
Filter Base And Engine Oil Cooler (2w2271 N/S)
| 2W***71 | Cooler Group-Filter Base & Eng Oil | 1 |
Filter Base And Engine Oil Cooler (2w2272 N/S)
| 2W***72 | Cooler Group-Filter Base & Eng Oil | 1 |
Transmission Oil Cooler (7n2731 N/S)
| 7N***31 | Cooler Group-Transmission Oil | 1 |
Engine Oil Filler (4w4270 N/S)
| 4W***70 | Filler Group-Oil; Engine Oil Filler Group | 1 |
Fumes Disposal (8n1295 N/S)
| 8N***95 | Fumes Disposal Group; Fumes Disposal Group | 1 |
Vandalism Protection (4w4268 N/S)-Engine Oil Filler
| 4W***68 | Protection Group-Vandalism; Vandalism Protection Group -- Engine Oil Filler | 1 |
Exhaust Shield (1159707 N/S)
| 11***07 | Shield Group-Exhaust | 1 |
Oil Filter Base (8n4457 N/S)
| 8N***57 | Base Group-Oil Filter; Base Group-Engine Oil Filter | 1 |
Breather (1p4244 N/S)
| 1P***44 | Breather Group | 1 |
Blower Fan (1080082 N/S)
| 10***82 | Fan Group-Blower | 1 |
Housing And Regulator (1190099 N/S)
| 11***99 | Housing & Regulator Group | 1 |
Water Lines (2w6779 N/S)
| 2W***79 | Lines Group-Water | 1 |
Water Lines (1114061 N/S)
| 11***61 | Lines Group-Water | 1 |
Water Pump (1167968 N/S)
| 11***68 | Pump Group-Water | 1 |
Radiator (1080090 N/S)-Part 2 Of 2
| 10***90 | Radiator Group | 1 |
Radiator (1106095 N/S)
| 11***95 | Radiator Group | 1 |
Radiator (1080090 N/S)-Part 1 Of 2
| 10***90 | Radiator Group | 1 |
Water Tank (1125362 N/S)
| 11***62 | Tank Group-Coolant | 1 |
1167967 Water Pump Group
| 11***67 | Water Pump | 1 |
Electrical System
3e6328 Alarm Group
| 3E***28 | Alarm Group; -Caterpillar Monitoring System-Action | 1 |
Charging Alternator-24v, 70a (1080088 N/S)
| 10***88 | Alternator Group | 1 |
1855294 Charging Alternator Group
| 18***94 | Alternator Group-Charging; -Waste Handling | 1 |
Charging Alternator-24v, 65a (1942928 N/S)
| 19***28 | Alternator Group-Charging | 1 |
1322156 Alternator Group-Delco Remy-Part 1 Of 2
| 13***56 | Alternator Group-Charging | 1 |
1322156 Alternator Group-Delco Remy-Part 2 Of 2
| 13***56 | Alternator Group-Charging | 1 |
Back-Up Alarm Wiring (1266995 N/S)
| 12***95 | Back-Up Alarm | 1 |
Battery (1266987 N/S)-Heavy Duty
| 12***87 | Battery | 1 |
Battery And Wiring (1081330 N/S)-Part 3 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery And Wiring (1081330 N/S)-Part 1 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery And Wiring (1081330 N/S)-Part 4 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery And Wiring (1081330 N/S)-Part 2 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery And Wiring (1081330 N/S)-Part 8 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery And Wiring (1081330 N/S)-Part 6 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery And Wiring (1081330 N/S)-Part 5 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery And Wiring (1081330 N/S)-Part 7 Of 8
| 10***30 | Battery & Wiring Group | 1 |
Battery Box (1080646 N/S)-Part 1 Of 2
| 10***46 | Box Group-Battery | 1 |
Battery Box (1080646 N/S)-Part 2 Of 2
| 10***46 | Box Group-Battery | 1 |
1658857 Charging Alternator-24v, 70a
| 16***57 | Charging Alternator | 1 |
Charging Alternator-24v, 70a (1700292 N/S)
| 17***92 | Charging Alternator | 1 |
Electric Control Group (1915020 N/S)
| 17***89 | Control Group-Unprogrammed; -Steering, Transmission | 1 |
| 19***20 | Control Group-Power Train | 1 |
Power Converter (1315039 N/S)-12v
| 13***39 | Converter Group-Electrical | 1 |
Electronics Arrangement (1382820 N/S)
| 12***69 | Film-Identification; (Autoshift Switch) | 1 |
| 13***20 | Electronics Ar-Machine | 1 |
| 13***05 | Electronics Group-Power Train; Control Gp-Power Train Elek | 1 |
Electronics (1393905 N/S)
| 13***05 | Electronics Group-Power Train; Control Gp-Power Train Elek | 1 |
| 19***20 | Control Group-Power Train | 1 |
1387916 Harness Assembly-Part 1 Of 3
| 13***16 | Harness Assembly | 1 |
1387916 Harness Assembly-Part 2 Of 3
| 13***16 | Harness Assembly | 1 |
1387916 Harness Assembly-Part 3 Of 3
| 13***16 | Harness Assembly | 1 |
1096376 Harness Assembly-Engine
| 10***76 | Harness Assembly; (Engine) | 1 |
1096379 Harness Assembly-Torque Convertor
| 10***79 | Harness Assembly | 1 |
1096374 Harness Assembly-Radiator
| 10***74 | Harness Assembly | 1 |
1137133 Harness Assembly-Fuel Tank
| 11***33 | Harness Assembly | 1 |
1343853 Harness Assembly-Fuse Box
| 13***53 | Harness Assembly-Fuse Box | 1 |
1336335 Flood Lamp Group
| 13***35 | Lamp Group-Flood; -24-Volt, 65-Watt-Blackout | 1 |
1336336 Flood Lamp Group
| 13***36 | Lamp Group-Flood; (24-Volt) | 1 |
1532073 Flood Lamp Group-(24v) (Vertical)
| 15***73 | Lamp Group-Flood; -Cab-Extended Bolster-Rear-Blade-Moldboard | 1 |
1470319 Flood Lamp Group-(24v) (Suspended)
| 14***19 | Lamp Group-Flood; -Engine Work, Rh, Lh | 1 |
1068964 Flood Lamp Group
1076689 Flood Lamp Group
| 10***89 | Lamp Group-Flood; -Vertical Mount | 1 |
Lighting (1080652 N/S)-4 Lamp
| 10***52 | Lighting Group-Flood | 1 |
Circuit Breaker Panel (1105083 N/S)
| 11***83 | Panel Group-Circuit Breaker | 1 |
Ether Starting Aid (1228950 N/S)
| 12***50 | Starting Aid Group-Ether | 1 |
Electric Starting Motor (1068552 N/S)-Robert Bosch
| 10***52 | Starting Motor Group-Electric | 1 |
6v5227 Electric Starting Motor Group
| 10***52 | Starting Motor Group-Electric | 1 |
| 6V***27 | Starting Motor Group-Electric | 1 |
| 6V***37 | Starting Motor Group-Electric | 1 |
Electric Starting Motor (6v5538 N/S)-Nippondenso
| 6V***38 | Starting Motor Group-Electric | 1 |
Electric Starting Motor (6v5537 N/S)-Delco Remy-Part 2 Of 2
| 6V***37 | Starting Motor Group-Electric | 1 |
Electric Starting Motor (7s3622 N/S)-24v
| 7S***22 | Starting Motor Group-Electric; Electric Starting Motor Group | 1 |
Electric Starting Motor (6v5537 N/S)-Delco Remy-Part 1 Of 2
| 6V***37 | Starting Motor Group-Electric | 1 |
7n0718 Disconnect Switch Assembly
| 7N***18 | Switch As-Disconnect; -Battery-Ground Level | 1 |
9x7781 Filter Bypass Switch Group
| 9X***81 | Switch Group-Bypass; -Xmsn Lubrication Supply Filter-Xmsn Lubrication Charge Filter-Hoist Screen-Tc, Front Brake Cooling-Transmission Oil Filter-Rear Axle Oil Filter | 1 |
1647577 Filter Bypass Switch Group
| 16***77 | Switch Group-Bypass; -Xmsn Lubrication Supply Filter-Xmsn Lubrication Charge Filter-Hoist Screen-Tc, Front Brake Cooling-Transmission Oil Filter-Rear Axle Oil Filter | 1 |
1251302 Magnetic Switch Assembly
| 12***02 | Switch Group-Magnetic; -Starting Motor, Start Relay | 1 |
Engine Arrangement
1081076 Engine Arrangement-Basic-Part 1 Of 2
| 10***76 | Engine Ar | 1 |
| 10***76 | Pulley Group-Crankshaft | 1 |
| 11***01 | Gear Group-Front | 1 |
1081076 Engine Arrangement-Basic-Part 2 Of 2
| 10***57 | Pump Group-Engine Oil | 1 |
| 10***76 | Engine Ar | 1 |
| 11***68 | Pump Group-Gov & Fuel Inj | 1 |
1081073 Engine Arrangement-Basic-Part 2 Of 2
| 10***57 | Pump Group-Engine Oil | 1 |
| 10***73 | Engine Ar | 1 |
| 11***68 | Pump Group-Gov & Fuel Inj | 1 |
1081073 Engine Arrangement-Basic-Part 1 Of 2
| 10***73 | Engine Ar | 1 |
| 10***76 | Pulley Group-Crankshaft | 1 |
| 11***01 | Gear Group-Front | 1 |
Installation Arrangement (1078309 N/S)
| 10***11 | Air Cleaner Group; Air Cleaner Group | 1 |
| 10***14 | Lines Group-Air; Air Lines Group | 1 |
| 10***09 | Installation Ar-Engine | 1 |
Frame And Body
Drawbar (7g8975 N/S)
| 7G***75 | Drawbar Group; -Short | 1 |
Drawbar (3w6866 N/S)
| 3W***66 | Drawbar Group; Drawbar Group | 1 |
Grill (8e4053 N/S)-Heavy Duty
| 8E***53 | Grill Group | 1 |
Precleaner Guard (3w1654 N/S)
| 3W***54 | Guard Group-Precleaner | 1 |
Transmission Guard (3w1356 N/S)
| 3W***56 | Guard Group-Transmission; (Includes Items 15a, B & C) | 1 |
6t3216 Track Idler Group-4 Required
| 6T***16 | Idler Group-Track; Track Idler Cap Group | 1 |
1492493 Track Idler Group
| 14***93 | Idler Group-Track | 1 |
6y1781 Track Carrier Roller Group-2 Required
| 6Y***81 | Roller Group-Track Carrier; -Heavy Duty | 1 |
Protective Screen (3w3057 N/S)
| 3W***57 | Screen Group-Protection | 1 |
Sweep (3w5366 N/S)
| 3W***66 | Sweep Group | 1 |
6i9655 Track Group-510mm Grouser Shoe-2 Required
| 6I***55 | Track Group; -2 Required | 1 |
6i9656 Track Group-560mm Grouser Shoe-2 Required
| 6I***56 | Track Group; -2-Required | 1 |
6i9642 Track Group-610mm Grouser Shoe-2 Required
| 6I***42 | Track Group; -2-Required | 1 |
6i9641 Track Group-560mm Grouser Shoe-2 Required
| 6I***41 | Track Group; -2-Required | 1 |
6i9653 Track Group-560mm Grouser Shoe-2 Required
| 6I***53 | Track Group; Track Group | 1 |
6i9654 Track Group-610mm Grouser Shoe-2 Required
| 6I***54 | Track Group; -2-Required | 1 |
6i9644 Track Group-560mm Grouser Shoe-2 Required
| 6I***44 | Track Group; -2-Required | 1 |
6i9643 Track Group-510mm Grouser Shoe-2 Required
| 6I***43 | Track Group; -2 Required | 1 |
Equalizer Bar (1091186 N/S)
| 10***86 | Bar Group-Equalizer | 1 |
Track Idler Cap (1081091 N/S)-8 Required
| 10***91 | Cap Group-Track Idler; -Sound Suppression | 1 |
Frame And Case (1079684 N/S)
| 10***84 | Case & Frame Group | 1 |
Chassis Arrangement (1266747 N/S)
| 10***57 | Fender Group | 1 |
| 10***84 | Case & Frame Group | 1 |
| 10***19 | Tank Group-Fuel | 1 |
Chassis Arrangement (1266749 N/S)
| 10***57 | Fender Group | 1 |
| 10***84 | Case & Frame Group | 1 |
| 10***19 | Tank Group-Fuel | 1 |
Ecology Drain (1106287 N/S)
| 11***87 | Drain Group-Ecology; -Case, Frame | 1 |
Engine Enclosure (1081329 N/S)-Part 2 Of 2
| 10***29 | Enclosure Group-Engine | 1 |
Engine Enclosure (1081331 N/S)-Part 1 Of 2
| 10***31 | Enclosure Group-Engine | 1 |
Engine Enclosure (1081331 N/S)-Part 2 Of 2
| 10***31 | Enclosure Group-Engine | 1 |
Engine Enclosure (1081329 N/S)-Part 1 Of 2
| 10***29 | Enclosure Group-Engine | 1 |
Enclosure (1080647 N/S)
| 10***47 | Enclosure Group-Fender | 1 |
Equalizer Bar (1266781 N/S)
| 12***81 | Equalizer Bar | 1 |
Fender (1069357 N/S)
| 10***57 | Fender Group | 1 |
1079683 Frame And Case Assembly
| 10***83 | Frame And Case Assembly | 1 |
Telescoping Recoil Frame (1080148 N/S)-L.H.
| 10***48 | Frame Group-Telescoping Recoil; (Lh)(Lh) | 1 |
Telescoping Recoil Frame (1080147 N/S)-R.H.
| 10***47 | Frame Group-Telescoping Recoil; (Rh)(Rh) | 1 |
Sand Blast Grid (1117161 N/S)
| 11***61 | Grid Group-Sand Blast Eroding | 1 |
Bottom Guard (1080649 N/S)
| 10***49 | Guard Group-Bottom | 1 |
Bottom Guard (1707184 N/S)-Heavy Duty
| 17***84 | Guard Group-Bottom | 1 |
Bottom Guard (1163205 N/S)-Extreme Service
| 11***05 | Guard Group-Bottom | 1 |
Bottom Guard (1163204 N/S)-Heavy Duty
| 11***04 | Guard Group-Bottom | 1 |
Bottom Guard (1707190 N/S)-Extreme Service
| 17***90 | Guard Group-Bottom | 1 |
Bottom Guard (1693693 N/S)
| 16***93 | Guard Group-Bottom | 1 |
Fuel Tank Guard (1108766 N/S)
| 11***66 | Guard Group-Fuel Tank | 1 |
Fuel Tank Guard (1108767 N/S)
| 11***67 | Guard Group-Fuel Tank; -With Ripper | 1 |
Radiator Guard (1080650 N/S)-Part 1 Of 2
| 10***50 | Guard Group-Radiator | 1 |
Radiator Guard (1080650 N/S)-Part 2 Of 2
| 10***50 | Guard Group-Radiator | 1 |
Radiator Bottom Guard (8e3041 N/S)-Heavy Duty
| 8E***41 | Guard Group-Radiator; (Bottom) | 1 |
Track Guiding Guard (1080178 N/S)
| 10***78 | Guard Group-Track Guide; -Heavy-Duty | 1 |
Track Roller Guard (1093443 N/S)
| 10***43 | Guard Group-Track Roller | 1 |
Track Roller Guard (1093444 N/S)
| 10***44 | Guard Group-Track Roller | 1 |
Hood (1081328 N/S)-Cab
| 10***28 | Hood & Guard Group | 1 |
Hood And Guard (1081332 N/S)
| 10***32 | Hood & Guard Group | 1 |
Front Pull Hook (1163203 N/S)
| 11***03 | Hook Group-Front Pull | 1 |
6i9668 Link Assembly
| 6I***68 | Link As-Track | 1 |
6i9671 Link Assembly
| 6I***71 | Link As-Track | 1 |
Cab Mounting (1059665 N/S)
| 10***65 | Mounting Group-Cab | 1 |
Carrier Roller Mounting (1080177 N/S)
| 10***77 | Mounting Group-Carrier Roller | 1 |
R.O.P.S. Mounting (1080651 N/S)
| 10***51 | Mounting Group-Rops | 1 |
Pivot Bar (1080175 N/S)
| 10***75 | Pivot Bar Group; -Systemone | 1 |
Platform (1081164 N/S)-Part 2 Of 2
| 10***64 | Platform Group-Cab | 1 |
Platform (1059666 N/S)
| 10***66 | Platform Group-Cab | 1 |
Platform (1081164 N/S)-Part 1 Of 2
| 10***64 | Platform Group-Cab | 1 |
Track Roller (1254177 N/S)-Double Flange
| 12***77 | Roller Ar-Track | 1 |
Track Roller (1255533 N/S)-Double Flange
| 12***33 | Roller Ar-Track; -Heavy-Duty | 1 |
Track Roller (1254176 N/S)-Double Flange
| 12***76 | Roller Group-Track-Double Flange; -Heavy-Duty | 1 |
Track Roller (1254175 N/S)-Single Flange-8 Required
| 12***75 | Roller Group-Track-Single Flange; -Heavy-Duty | 1 |
Telescoping Recoil Frame (1266784 N/S)-L.H.
| 12***84 | Telescoping Recoil Frame | 1 |
Telescoping Recoil Frame (1266783 N/S)-R.H.
| 12***83 | Telescoping Recoil Frame | 1 |
Track Adjuster And Recoil (1270471 N/S)
| 12***71 | Track Adjuster And Recoil | 1 |
Undercarriage Arrangement (1078297 N/S)
| 10***97 | Undercarriage Ar | 1 |
| 10***47 | Frame Group-Telescoping Recoil; (Rh)(Rh) | 1 |
| 10***48 | Frame Group-Telescoping Recoil; (Lh)(Lh) | 1 |
Undercarriage Arrangement (1266778 N/S)
| 10***75 | Pivot Bar Group; -Systemone | 1 |
| 10***91 | Cap Group-Track Idler; -Sound Suppression | 8 |
| 12***75 | Roller Group-Track-Single Flange; -Heavy-Duty | 8 |
Fuel System
Primary Fuel Filter (1w1690 N/S)
| 1W***90 | Filter Group-Primary Fuel | 1 |
Primary Fuel Filter (1w6351 N/S)
Secondary Filter (7w5156 N/S)
Torque Control (1w8668 N/S)
| 1W***68 | Torque Control Group | 1 |
1113770 Camshaft Assembly
| 11***70 | Camshaft Group | 1 |
1115162 Fuel Ratio Control Group
| 11***62 | Control Group-Fuel Ratio (Basic) | 1 |
4p9840 Fuel Pump Housing Assembly
| 4P***40 | Fuel Pump Housing Assembly | 1 |
2w2410 Governor Group-Part 2 Of 3
| 2W***10 | Governor Group | 1 |
2w2410 Governor Group-Part 1 Of 3
| 2W***10 | Governor Group | 1 |
2w2410 Governor Group-Part 3 Of 3
| 2W***10 | Governor Group | 1 |
Drain Lines (2w1605 N/S)
Fuel Lines (1081319 N/S)
Drain Lines (1858023 N/S)
| 18***23 | Lines Group-Fuel Drain | 1 |
Fuel Injection Lines (1135341 N/S)
Fuel System Protection (1287984 N/S)
4p9827 Fuel Injection Pump Group
| 4P***27 | Pump Group-Fuel Injection | 1 |
1113769 Fuel Injection Pump Group
| 11***69 | Pump Group-Fuel Injection | 1 |
Fuel Priming Pump And Primary Filter (1858021 N/S)
Fuel Priming Pump And Primary Filter (1697278 N/S)
1w1695 Fuel Transfer Pump Group
Fuel Transfer Pump And Mounting (2w4160 N/S)
Governor And Fuel Injection Pump (1113768 N/S)
| 11***68 | Pump Group-Gov & Fuel Inj | 1 |
Fuel Tank (1080619 N/S)-250 Liter
Fuel Tank (1704876 N/S)-250 Liter
Hydraulic System
Tilt Cylinder Arrangement (9w9057 N/S)-Angling Bulldozer
| 8C***42 | Bolt-Plt; (3/4unc X 4) | 8 |
| 9T***95 | Cylinder Group-Tilt; Tilt Cylinder Group | 2 |
| 9W***57 | Cylinder Ar-Tilt; -Bulldozer | 1 |
9t2716 Ripper Cylinder Group-127mm Bore X 362mm Stroke
| 9T***16 | Cylinder Group-Ripper Lift; (Ripper Lift) | 1 |
1662582 Tilt Cylinder Group-165.1mm Bore X 128mm Stroke
| 16***82 | Cylinder Group-Tilt; -Semi-Universal Bulldozer | 1 |
9t6095 Tilt Cylinder Group-152mm Bore X 105mm Stroke
| 9T***95 | Cylinder Group-Tilt; Tilt Cylinder Group | 1 |
1u3991 Tilt Cylinder Group-165mm Bore X 128mm Stroke
| 1U***91 | Cylinder Group-Tilt | 1 |
Ripper Lines (1081334 N/S)
| 10***34 | Lines Group-Ripper | 1 |
Ripper Lines (9w1018 N/S)
| 9W***18 | Lines Group-Ripper; Ripper Lines Group | 1 |
Tilt Cylinder Lines (1081315 N/S)
| 10***15 | Lines Group-Tilt Cylinder | 1 |
Tilt Cylinder Lines (1u2393 N/S)-Part 2 Of 2
| 1U***93 | Lines Group-Tilt Cylinder; Tilt Cylinder Lines Group | 1 |
Tilt Cylinder Lines (1u2393 N/S)-Part 1 Of 2
| 1U***93 | Lines Group-Tilt Cylinder; Tilt Cylinder Lines Group | 1 |
Tilt Cylinder Lines (9w9079 N/S)-Part 2 Of 2
| 9W***79 | Lines Group-Tilt Cylinder; Tilt Cylinder Lines Group | 1 |
Tilt Cylinder Lines (9w9079 N/S)-Part 1 Of 2
| 9W***79 | Lines Group-Tilt Cylinder; Tilt Cylinder Lines Group | 1 |
Hydraulic Tank Cap Protection Cover (9g9288 N/S)
| 9G***88 | Protection Cover Group; -Hydraulic Tank-Steering Tank Fill Cap-Hydraulic Tank Fill Cap | 1 |
9t9912 Hydraulic Pump Group-Part 1 Of 2
| 9T***12 | Pump Group-Piston | 1 |
9t9912 Hydraulic Pump Group-Part 2 Of 2
| 9T***12 | Pump Group-Piston | 1 |
1022064 Rotating Group-Pump
| 10***64 | Rotating Group-Pump; -Hydraulic Fan | 1 |
1022068 Pressure And Flow Compensator Valve Group
| 10***68 | Valve Group-Press & Flow Cmpnstr; (Pressure, Flow Compensator) | 1 |
1135429 Quick Drop Valve Group
| 11***29 | Valve Group-Quick-Drop; -Bulldozer | 1 |
4t1008 Relief Valve Group
| 4T***08 | Valve Group-Relief; -Inlet Manifold-Charging | 1 |
9t8378 Relief Valve Group
| 9T***78 | Valve Group-Relief; (Direct Operated) | 1 |
Hydraulic Hand Control (1073915 N/S)-Ripper-Part 1 Of 2
| 10***15 | Control Group-Hydraulic | 1 |
Hydraulic Hand Control (1073915 N/S)-Ripper-Part 2 Of 2
| 10***15 | Control Group-Hydraulic | 1 |
Hydraulic Hand Control (1073911 N/S)-Lift And Tilt-Part 1 Of 2
| 10***11 | Control Group-Hydraulic Hand | 1 |
Hydraulic Hand Control (1073911 N/S)-Lift And Tilt-Part 2 Of 2
| 10***11 | Control Group-Hydraulic Hand | 1 |
Lift Cylinder And Lines (1268465 N/S)-L.H.
| 12***65 | Cylinder & Lines Group-Lift; -Lh-Bulldozer | 1 |
Lift Cylinder And Lines (1268464 N/S)-R.H.
| 12***64 | Cylinder & Lines Group-Lift; -Rh-Bulldozer | 1 |
1278931 Lift Cylinder Group-101.6mm Bore X 1262mm Stroke
| 12***31 | Cylinder Group-Bulldozer Lift; -Bulldozer | 1 |
Hydraulic Arrangement (1078300 N/S)
| 10***11 | Control Group-Hydraulic Hand | 1 |
| 10***00 | Hydraulic Ar | 1 |
| 10***14 | Lines Group-Lift Cylinder | 1 |
Hydraulic Arrangement (1266787 N/S)-For Angle Dozer
| 0S***07 | Spacer-Pawl; (13/3 X 3/4 X 25/64in Thk) | 2 |
| 10***79 | Film-Instruction | 1 |
| 12***87 | Hydraulic Arrangement | 1 |
Hydraulic Arrangement (1266789 N/S)-3 Valve Angle And Ripper
| 0S***07 | Spacer-Pawl; (13/3 X 3/4 X 25/64in Thk) | 2 |
| 10***15 | Control Group-Hydraulic | 1 |
| 10***34 | Lines Group-Ripper | 1 |
Lift Cylinder Lines (1081314 N/S)-Part 2 Of 2
| 10***14 | Lines Group-Lift Cylinder | 1 |
Lift Cylinder Lines (1081314 N/S)-Part 1 Of 2
| 10***14 | Lines Group-Lift Cylinder | 1 |
Pump Lines (1081316 N/S)-Part 1 Of 3
| 10***16 | Lines Group-Pump | 1 |
Pump Lines (1081316 N/S)-Part 2 Of 3
| 10***16 | Lines Group-Pump | 1 |
Pump Lines (1081316 N/S)-Part 3of 3
| 10***16 | Lines Group-Pump | 1 |
Tilt Cylinder And Lines (6y5705 N/S)
| 6Y***05 | Lines Group-Tilt & Tip Cylinder; -Semi-Universal Bulldozer | 1 |
1129083 Manifold Group
| 11***83 | Manifold Group-Control | 1 |
Valve Mounting (1101454 N/S)
| 11***54 | Mounting Group-Valve | 1 |
Hydraulic Tank And Filter (1081532 N/S)-76 Liter-Part 1 Of 2
| 10***32 | Tank & Filter Group-Hydraulic | 1 |
Hydraulic Tank And Filter (1081532 N/S)-76 Liter-Part 2 Of 2
| 10***32 | Tank & Filter Group-Hydraulic | 1 |
1081585 Unit Test Valve Group-2 Valve-Part 1 Of 2
| 10***85 | Valve Group-Bank 2 | 1 |
1081585 Unit Test Valve Group-2 Valve-Part 2 Of 2
| 10***85 | Valve Group-Bank 2 | 1 |
Unit Test Valve (1081583 N/S)-3 Valve
| 10***83 | Valve Group-Bank 3 | 1 |
4t5896 Check Valve Group
| 4T***96 | Valve Group-Check; -Pressure Reducing | 1 |
1071189 Control Valve Group
| 10***89 | Valve Group-Control; (Tilt Cylinder) | 1 |
1071185 Control Valve Group
| 10***85 | Valve Group-Control; (Lift Cylinder) | 1 |
1071186 Control Valve Group
| 10***86 | Valve Group-Control; (Ripper Cylinder) | 1 |
4t1860 Shuttle Valve Group
| 4T***60 | Valve Group-Shuttle; -Ripper Lift-Ripper Tilt-Blade Tilt-Blade Lift | 1 |
Vandalism Protection Arrangement (4y9764 N/S)
| 1W***21 | Protection Group-Vandalism; Vandalism Protection Group -- Engine Oil Level Gage | 1 |
| 4W***68 | Protection Group-Vandalism; Vandalism Protection Group -- Engine Oil Filler | 1 |
| 4Y***64 | Vandalism Protection Arrangement | 1 |
Winch Control (1382423 N/S)
| 13***23 | Winch Control | 1 |
Implements
Bulldozer Brance (4t5348 N/S)
| 4T***48 | Brace Group-Bulldozer; Bulldozer Brace Group | 1 |
C-Frame (6i8346 N/S)-Power Angling
| 6I***46 | C-Frame Group; -Extra Long Angling Bulldozer | 1 |
C-Frame (6y2073 N/S)-Power Angling
| 6Y***73 | C-Frame Group; -Angling Bulldozer | 1 |
Cylinder Mounting (3g9451 N/S)
| 3G***51 | Mounting Group-Cylinder; Cylinder Mounting Group | 1 |
Push Arm (1940937 N/S)-Part 1 Of 2
| 19***37 | Push Arm Group; -Extra Long Semi-Univ Bulldozer | 1 |
Push Arm (1940937 N/S)-Part 2 Of 2
| 19***37 | Push Arm Group; -Extra Long Semi-Univ Bulldozer | 1 |
Push Arm (8e9375 N/S)-Part 2 Of 2
| 8E***75 | Push Arm Group; Push Arm Group | 1 |
Push Arm (6y0949 N/S)
| 6Y***49 | Push Arm Group; Push Arm Group | 1 |
Push Arm (8e9375 N/S)-Part 1 Of 2
| 8E***75 | Push Arm Group; Push Arm Group | 1 |
Push Arm (1909771 N/S)
| 19***71 | Push Arm Group; -Semi-Universal Bulldozer | 1 |
Power Angle And Tilt Bulldozer Arrangement (1083978 N/S)
| 10***78 | Bulldozer Ar-Angling | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 12***64 | Cylinder & Lines Group-Lift; -Rh-Bulldozer | 1 |
Power Angle And Tilt Bulldozer Arrangement (1083982 N/S)
| 10***82 | Bulldozer Ar-Angling; -Extra Long | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 12***64 | Cylinder & Lines Group-Lift; -Rh-Bulldozer | 1 |
Power Angle And Tilt Bulldozer Arrangement (1083979 N/S)-Basic
| 10***79 | Bulldozer Ar-Angling | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 4T***48 | Brace Group-Bulldozer; Bulldozer Brace Group | 1 |
Power Angle And Tilt Bulldozer Arrangement (1083983 N/S)-Basic
| 10***83 | Bulldozer Ar-Angling; -Extra Long | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 4T***48 | Brace Group-Bulldozer; Bulldozer Brace Group | 1 |
Semi Universal Bulldozer Arrangement (1083977 N/S)-Basic
| 10***77 | Bulldozer Ar-Semi-Universal; -Extra Long | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 6Y***05 | Lines Group-Tilt & Tip Cylinder; -Semi-Universal Bulldozer | 1 |
Semi Universal Bulldozer Arrangement (1083974 N/S)
| 10***74 | Bulldozer Ar-Semi-Universal | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 12***64 | Cylinder & Lines Group-Lift; -Rh-Bulldozer | 1 |
Semi Universal Bulldozer Arrangement (1083975 N/S)-Basic
| 10***75 | Bulldozer Ar-Semi-Universal | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 19***71 | Push Arm Group; -Semi-Universal Bulldozer | 1 |
Semi Universal Bulldozer Arrangement (1083976 N/S)
| 10***76 | Bulldozer Ar-Semi-Universal; -Extra Long | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 12***64 | Cylinder & Lines Group-Lift; -Rh-Bulldozer | 1 |
Straight Bulldozer Arrangement (1083970 N/S)
| 10***70 | Bulldozer Ar-Straight | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 12***64 | Cylinder & Lines Group-Lift; -Rh-Bulldozer | 1 |
Straight Bulldozer Arrangement (1083971 N/S)-Basic
| 10***71 | Bulldozer Ar-Straight | 1 |
| 10***52 | Trunnion Group-Bulldozer | 1 |
| 19***71 | Push Arm Group; -Semi-Universal Bulldozer | 1 |
Tilt Cylinder Guard (4y9397 N/S)
| 4Y***97 | Tilt Cylinder Guard | 1 |
Bulldozer Trunnion (1091352 N/S)
| 10***52 | Trunnion Group-Bulldozer | 1 |
Lubrication System
Engine Oil Lines (2p6105 N/S)
| 2P***05 | Lines Group-Engine Oil; Engine Oil Lines Group | 1 |
6i1346 Engine Oil Pump Group
| 6I***46 | Pump Group-Engine Oil | 1 |
Engine Oil Pump (1068957 N/S)
| 10***57 | Pump Group-Engine Oil | 1 |
Machine Arrangement
General Arrangement (1266737 N/S)
| 10***89 | Power Train Ar | 1 |
| 10***00 | Hydraulic Ar | 1 |
| 10***09 | Installation Ar-Engine | 1 |
General Arrangement (1266739 N/S)
| 10***89 | Power Train Ar | 1 |
| 10***97 | Undercarriage Ar | 1 |
| 10***00 | Hydraulic Ar | 1 |
Operator Station
Roll-Over Protective System (9g0963 N/S)
| 9G***63 | Rops Group | 1 |
Roll-Over Protective System (7g7999 N/S)
| 7G***99 | Rops Group; Roll-Over Protective System Group | 1 |
7t1068 Window Group-R.H.
| 7T***68 | Window Group | 1 |
7t1069 Window Group-L.H.
| 7T***69 | Window Group | 1 |
6t8402 Window Group-R.H.
| 6T***02 | Window Group-Cab | 1 |
6t8403 Window Group-L.H.
| 6T***03 | Window Group-Cab | 1 |
6w8505 Seat Adjuster Group
| 6W***05 | Adjuster Group-Seat; -Suspension | 1 |
Air Conditioner Arrangement (1391016 N/S)
| 10***20 | Air Conditioner Group; -Waste Handling | 1 |
| 10***20 | Condenser & Mtg Group-Refrigerant | 1 |
| 11***93 | Plate; (Instruction) (On Right Side Behind Cab Door) | 1 |
Air Conditioner (1080720 N/S)
| 10***20 | Air Conditioner Group; -Waste Handling | 1 |
Air Conditioner Lines (1391015 N/S)-Part 2 Of 2
| 13***15 | Air Conditioner Lines | 1 |
Air Conditioner Lines (1391015 N/S)-Part 1 Of 2
| 13***15 | Air Conditioner Lines | 1 |
Blower Group (1095762 N/S)-Part 1 Of 2
| 10***62 | Blower Group-Cab | 1 |
Blower Group (1095762 N/S)-Part 2 Of 2
| 10***62 | Blower Group-Cab | 1 |
Cab Arrangement (1059655 N/S)
Cab Arrangement (1266796 N/S)-R.O.P.S.
Cab Arrangement (1266798 N/S)-Head Guard
4y9483 Cab Group-Basic-Part 2 Of 3
| 4Y***83 | Cab Group | 1 |
4y9483 Cab Group-Basic-Part 1 Of 3
| 4Y***83 | Cab Group | 1 |
4y9483 Cab Group-Basic-Part 3 Of 3
| 4Y***83 | Cab Group | 1 |
Canopy (4y9681 N/S)-Soft
| 4Y***81 | Canopy | 1 |
Refrigerant Compressor (1499929 N/S)
| 14***29 | Compressor Group-Refrigerant | 1 |
Refrigerant Compressor (1067634 N/S)
| 10***34 | Compressor Group-Refrigerant | 1 |
Condenser And Mounting (1097320 N/S)
| 10***20 | Condenser & Mtg Group-Refrigerant | 1 |
Console Cover (1292008 N/S)
| 12***08 | Cover Group-Console | 1 |
8y5874 Backrest Extension Group
| 8Y***74 | Extension Group-Backrest; Backrest Extension Group | 1 |
1621613 Harness Assembly
| 16***13 | Harness Assembly | 1 |
1362087 Harness Assembly-Dash
| 13***87 | Harness Assembly | 1 |
1117198 Harness Assembly
| 11***98 | Harness Assembly; (Blower) | 1 |
1097955 Harness Assembly
| 10***55 | Harness Assembly | 1 |
Cab Heater (1082675 N/S)
| 10***75 | Heater Group-Cab; -Waste Handling | 1 |
1084582 Housing Group Suspension-Part 2 Of 2
| 10***82 | Housing Group-Seat Suspension | 1 |
1084582 Housing Group Suspension-Part 1 Of 2
| 10***82 | Housing Group-Seat Suspension | 1 |
Radio Installation (1059657 N/S)
| 10***57 | Installation Group-Radio | 1 |
Instrument Panel (1288102 N/S)-Open R.O.P.S.-Part 2 Of 2
Instrument Panel (1288101 N/S)-Part 1 Of 2
Instrument Panel (1288101 N/S)-Part 2 Of 2
| 12***01 | Instrument Group | 1 |
Instrument Panel (1288102 N/S)-Open R.O.P.S.-Part 1 Of 2
3e6389 Dome Lamp Group
| 3E***89 | Lamp Group-Dome; -With Switch-Cab, Rh, Lh | 1 |
Cab Liner (1152331 N/S)
| 11***31 | Liner Group-Cab | 1 |
Cab Liner (1059658 N/S)
| 10***58 | Liner Group-Cab | 1 |
Cab Heater Lines (1081333 N/S)
| 10***33 | Lines Group-Heater | 1 |
Mirror (9p9392 N/S)
| 9P***92 | Mirror Group; -Open Rops-Rops | 1 |
Mirror (1059659 N/S)
| 10***59 | Mirror Group-Rear View; -Interior | 1 |
1666928 Electronic Control Group
| 16***28 | Module Group-Quad Gauge; -Engine Coolant Temp, Transmission Oil Temp, Hydraulic Oil Temp, Fuel Level | 1 |
1005895 Electronic Control Group
| 10***95 | Module Group-Quad Gauge; (Quad Gauge Module) | 1 |
1171881 Wiper Motor Assembly
| 11***81 | Motor As-Window Wiper; -Door, Rh | 1 |
1171882 Wiper Motor Assembly
| 11***82 | Motor As-Window Wiper; -Door, Lh | 1 |
1477976 Wiper Motor Group-Basic
| 14***76 | Motor Group-Window Wiper; -Front Window | 1 |
1477979 Wiper Motor Group-Basic
| 14***79 | Motor Group-Window Wiper; -Rear | 1 |
1088421 Pan Assembly
| 10***21 | Pan Group-Backrest; -Seat Back | 1 |
Wiper Arm Pivot (6v6561 N/S)
| 6V***61 | Pivot Group-Wiper Arm; (Wiper Arm) | 1 |
Cab Pressurizer (1059670 N/S)-Part 2 Of 2
| 10***70 | Pressurizer Group-Cab | 1 |
Cab Pressurizer (1059670 N/S)-Part 1 Of 2
| 10***70 | Pressurizer Group-Cab | 1 |
Refrigerant Compressor (1764850 N/S)
| 17***50 | Refrigerant Compressor | 1 |
1561148 Seat Belt Group
| 15***48 | Seat Belt Group; -Retractable-Operator | 1 |
8y5976 Seat Group-Vinyl-Part 2 Of 2
| 8Y***76 | Seat Group; -Vinyl, Lumbar | 1 |
Suspension Seat (1416676 N/S)
| 14***76 | Seat Group | 1 |
8y5986 Seat Group-Fabric-Part 1 Of 2
| 8Y***86 | Seat Group; Seat Gp-Basic (Fabric) (Lumbar) | 1 |
Suspension Seat (1416643 N/S)
| 14***43 | Seat Group | 1 |
8y5976 Seat Group-Vinyl-Part 1 Of 2
| 8Y***76 | Seat Group; -Vinyl, Lumbar | 1 |
8y5986 Seat Group-Fabric-Part 2 Of 2
| 8Y***86 | Seat Group; Seat Gp-Basic (Fabric) (Lumbar) | 1 |
8y6138 Suspension Seat Group-Fabric
| 8Y***38 | Seat Group-Suspension; -Cloth, Lumbar | 1 |
8y3914 Suspension Seat Group-Part 1 Of 2
8y3914 Suspension Seat Group-Part 2 Of 2
| 8Y***14 | Seat Group-Suspension | 1 |
8y6179 Suspension Seat Group-Vinyl
| 8Y***79 | Seat Group-Suspension | 1 |
1084082 Seat Suspension Group
| 10***82 | Suspension Group-Seat; -Contour-Shock Absorber | 1 |
6w8502 Seat Suspension Group-Part 2 Of 2
| 6W***02 | Suspension Group-Seat | 1 |
6w8502 Seat Suspension Group-Part 1 Of 2
| 6W***02 | Suspension Group-Seat | 1 |
9g7641 Start Switch Group
| 9G***41 | Switch Group-Start; -Engine, Key-Vims Service | 1 |
Windshield Washer Bottle (1126632 N/S)
| 11***32 | Tank Group-Window Washer | 1 |
Windshield Washer (1059660 N/S)-Part 2 Of 2
| 10***60 | Washer Group-Window | 1 |
Windshield Washer (1059660 N/S)-Part 1 Of 2
| 10***60 | Washer Group-Window | 1 |
Wiper (1059661 N/S)
| 10***61 | Wiper Group-Window | 1 |
Power Train
Coupling And Guard (8g4678 N/S)
| 8G***78 | Coupling & Guard Group; Coupling And Guard Group | 1 |
Final Drive Group (7g5532 N/S)
| 7G***32 | Final Drive Group; Final Drive Group | 1 |
Bevel And Transfer Gear (7g4634 N/S)-Part 1 Of 2
| 7G***34 | Gear Group-Bevel & Transfer; Bevel And Transfer Gear Group | 1 |
Bevel And Transfer Gear (7g4634 N/S)-Part 2 Of 2
| 7G***34 | Gear Group-Bevel & Transfer; Bevel And Transfer Gear Group | 1 |
Transmission Mounting (8g3087 N/S)
| 8G***87 | Mounting Group-Transmission | 1 |
Screen (3t5298 N/S)
| 3T***98 | Screen Group; -Power Train Oil | 1 |
9w5596 Relief Valve Group
| 9W***96 | Valve Group-Relief; -Torque Converter Outlet | 1 |
1094365 Relief Valve Group
| 10***65 | Valve Group-Relief; -Transmission Hydraulic Control | 1 |
Yoke (8n0198 N/S)
| 8N***98 | Yoke Group; Yoke Group | 1 |
Powertrain Axle (1071023 N/S)
| 10***23 | Axle Group-Power Train | 1 |
Transmission Parts And Case (1086983 N/S)-Part 2 Of 2
| 10***83 | Case & Parts Group-Planetary | 1 |
Transmission Parts And Case (1086983 N/S)-Part 1 Of 2
| 10***83 | Case & Parts Group-Planetary | 1 |
Transmission Hydraulic Control (1635641 N/S)-Part 2 Of 2
| 16***41 | Control Group-Transmission Hydraulic | 1 |
Transmission Hydraulic Control (1635641 N/S)-Part 1 Of 2
| 16***41 | Control Group-Transmission Hydraulic | 1 |
Transmission Hydraulic Control (1087011 N/S)-Part 2 Of 2
| 10***11 | Control Group-Transmission Hydraulic | 1 |
Transmission Hydraulic Control (1087011 N/S)-Part 1 Of 2
| 10***11 | Control Group-Transmission Hydraulic | 1 |
Transmission Filter (1331290 N/S)
| 13***90 | Filter Group-Oil; (Transmission) | 1 |
Harness Assembly (1428076 N/S)
| 14***76 | Harness Assembly; (Solenoid) | 1 |
2054626 Harness Assembly
| 20***26 | Harness Assembly; (Transmission) | 1 |
Harness Assembly (1447871 N/S)
| 14***71 | Harness Assembly; (Transmission Speed)(Transmission Speed Sensors) | 1 |
Power Train Oil Lines (1081324 N/S)-Part 3 Of 4
| 10***24 | Lines Group-Power Train Oil | 1 |
Power Train Oil Lines (1081324 N/S)-Part 1 Of 4
| 10***24 | Lines Group-Power Train Oil | 1 |
Power Train Oil Lines (1081324 N/S)-Part 2 Of 4
| 10***24 | Lines Group-Power Train Oil | 1 |
Power Train Oil Lines (1081324 N/S)-Part 4 Of 4
| 10***24 | Lines Group-Power Train Oil | 1 |
Transmission Planetary (1086984 N/S)-Part 3 Of 4
| 10***84 | Planetary Group-Transmission | 1 |
Transmission Planetary (1086984 N/S)-Part 1 Of 4
| 10***84 | Planetary Group-Transmission | 1 |
Transmission Planetary (1086984 N/S)-Part 2 Of 4
| 10***84 | Planetary Group-Transmission | 1 |
Transmission Planetary (1086984 N/S)-Part 4 Of 4
| 10***84 | Planetary Group-Transmission | 1 |
Powertrain Arrangement (1078289 N/S)
| 10***05 | Kit-Receptacle; (6-Pin)(Display Monitor Harness) | 1 |
| 10***72 | Clutch & Brake Group-Steering | 2 |
| 10***23 | Axle Group-Power Train | 1 |
Gear Pump Group (1084113 N/S)
| 10***13 | Pump Group-Gear; -Transmission, Torque Converter | 1 |
1331403 Gear Pump Group
| 13***03 | Pump Group-Gear; -Xmsn And Conv Charging, Scav | 1 |
Main Drive Shaft (1081696 N/S)
| 10***96 | Shaft Group-Drive | 1 |
1t2004 Torque Converter Group
| 1T***04 | Torque Converter Group | 1 |
Torque Converter (1081429 N/S)
| 10***29 | Torque Converter Group | 1 |
Torque Converter (1081430 N/S)
| 10***30 | Torque Converter Group | 1 |
1t2055 Torque Converter Group
| 1T***55 | Torque Converter Group | 1 |
1081198 Transmission Arrangement
| 10***98 | Transmission Ar | 1 |
| 10***83 | Case & Parts Group-Planetary | 1 |
| 10***84 | Planetary Group-Transmission | 1 |
Transmission Arrangement (1803428 N/S)
| 10***83 | Case & Parts Group-Planetary | 1 |
| 10***84 | Planetary Group-Transmission | 1 |
| 16***41 | Control Group-Transmission Hydraulic | 1 |
2443114 Modulating Valve Group
| 24***14 | Valve Group-Modulating; -Transmission Hydraulic Control | 1 |
1590931 Modulating Valve Group
| 15***31 | Valve Group-Modulating; -Transmission Clutch | 1 |
1181336 Modulating Valve Group
| 11***36 | Valve Group-Modulating; -Transmission Clutch | 1 |
Priority Valve Group (1458310 N/S)
| 14***10 | Valve Group-Priority; -Power Train Oil | 1 |
Priority Valve Group (1088885 N/S)
| 10***85 | Valve Group-Priority | 1 |
1361679 Solenoid Valve Group
| 13***79 | Valve Group-Solenoid; -Clutch | 1 |
Service Equipment And Supplies
Films (1262297 N/S)
| 12***97 | Film Group | 1 |
Films (1262300 N/S)
| 12***00 | Film Group | 1 |
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
Name Plate And Films (1266770 N/S)
| 10***50 | Film; (Air Cleaner) (Radial Seal) (On Air Cleaner Cover) | 1 |
| 12***70 | Name Plate And Films | 1 |
| 12***19 | Film-Notice; (On Center Of Right Side Engine Guard Door) | 1 |
Name Plate And Films (1266768 N/S)
| 10***50 | Film; (Air Cleaner) (Radial Seal) (On Air Cleaner Cover) | 1 |
| 12***68 | Name Plate And Films | 1 |
| 12***19 | Film-Notice; (On Center Of Right Side Engine Guard Door) | 0 |
9s7977 Tool Group
| 9S***77 | Tool Group-Hand | 1 |
Steering And Braking System
Steering And Transmission Control Adjuster (1242354 N/S)-Part 2 Of 2
| 12***54 | Adjuster Group-Control; (Steering, Xmsn Control, Elect) | 1 |
Steering And Transmission Control Adjuster (1221511 N/S)-Part 1 Of 2
| 12***11 | Adjuster Group-Control; (Steering, Xmsn Control, Manual) | 1 |
Steering And Transmission Control Adjuster (1221511 N/S)-Part 2 Of 2
| 12***11 | Adjuster Group-Control; (Steering, Xmsn Control, Manual) | 1 |
Steering And Transmission Control Adjuster (1242354 N/S)-Part 1 Of 2
| 12***54 | Adjuster Group-Control; (Steering, Xmsn Control, Elect) | 1 |
Steering Clutch And Brake (1045372 N/S)-Part 1 Of 2
| 10***72 | Clutch & Brake Group-Steering | 1 |
Steering Clutch And Brake (1045372 N/S)-Part 2 Of 2
| 10***72 | Clutch & Brake Group-Steering | 1 |
Governor And Brake Control (1073889 N/S)
| 10***89 | Control Group-Governor & Brake | 1 |
Brake Control (1236446 N/S)
| 12***46 | Control Group-Parking Brake | 1 |
Steering Control And Mounting (1073900 N/S)
| 10***00 | Keeper Pin, Control Group-Steering | 1 |
Steering Control Group (1073926 N/S)
| 10***26 | Control Group-Steering | 1 |
| 12***56 | Control Group-Steering & Xmsn | 1 |
Steering And Transmission Control (1221512 N/S)-Part 1 Of 2
| 12***12 | Control Group-Steering & Xmsn | 1 |
Steering And Transmission Control (1221512 N/S)-Part 2 Of 2
| 12***12 | Control Group-Steering & Xmsn | 1 |
Steering And Transmission Control (1221513 N/S)
| 12***13 | Control Group-Steering & Xmsn | 1 |
Steering And Transmission Control (1242356 N/S)
| 12***56 | Control Group-Steering & Xmsn | 1 |
1601758 Electric Control
| 16***58 | Control Group-Unprogrammed; -Steering-Power Train | 1 |
1729389 Electronic Control Group-Basic
| 17***89 | Control Group-Unprogrammed; -Steering, Transmission | 1 |
Electric Control (1090563 N/S)
| 10***63 | Electric Control | 1 |
Steering Gear Group (1259664 N/S)
| 12***64 | Gear Group-Steering; -Steering Clutch, Brake, Rh | 1 |
1227372 Steering Gear Group
| 12***72 | Gear Group-Steering; -Steering Clutch, Brake, Lh | 1 |
1338468 Harness Assembly
| 13***68 | Harness Assembly | 1 |
Manifold (1378795 N/S)
| 13***95 | Manifold & Valve Group; -Steering Clutch, Brake, Rh, Lh | 1 |
Manifold (1333246 N/S)
| 13***46 | Manifold & Valve Group; -Parking, Secondary Brake | 1 |
Manifold (1754972 N/S)
| 17***72 | Manifold & Valve Group; -Steering Clutch, Brake, Rh, Lh | 1 |
Governor And Brake Pedal (1073890 N/S)-Part 1 Of 2
| 10***90 | Pedal Group-Governor & Brake | 1 |
Governor And Brake Pedal (1073890 N/S)-Part 2 Of 2
| 10***90 | Pedal Group-Governor & Brake | 1 |
9x5592 Electric Control Group
| 9X***92 | Sensor Group-Position; -Direction, Speed-Steering Pedal, Rh, Lh-Center Pedal | 1 |
1471680 Sensor Group
| 14***80 | Sensor Group-Position; -Direction, Speed-Steering Pedal, Rh, Lh-Center Pedal | 1 |
1618979 Position Sensor Group
| 16***79 | Sensor Group-Position; -Steering, Xmsn Control Handle | 1 |
1744909 Solenoid Valve Group
| 17***09 | Valve Group-Solenoid; (Steering Clutch, Brake, Rh, Lh) | 1 |
1722392 Solenoid Valve Group
| 17***92 | Valve Group-Solenoid; (Parking, Secondary Brake) | 1 |
1332250 Solenoid Valve Group
| 13***50 | Valve Group-Solenoid; (24 Volt) | 1 |
1214030 Solenoid Valve Group
| 12***30 | Valve Group-Solenoid | 1 |
1646092 Unit Test Valve Group-3 Valve
| 16***92 | Valve Group-Steering & Brake Cont | 1 |
Basic Valve Group (1378796 N/S)
| 13***96 | Valve Group-Steering & Brake Cont | 1 |
1333255 Unit Test Valve Group-3 Valve
| 13***55 | Valve Group-Steering & Brake Cont | 1 |
Work Tools
End Bit (6y2908 N/S)-Abrasion
| 6Y***08 | Bit Group-End | 1 |
End Bit (7t2307 N/S)-Abrasion
| 4T***54 | End Bit (L. H.) | 1 |
| 4T***55 | End Bit (R. H.) | 1 |
| 7T***07 | Bit Group-End | 1 |
Angling Blade (8e1092 N/S)
| 8E***92 | Blade Group-Angling; Angling Brade Group | 1 |
Angling Blade (6y1806 N/S)
| 6Y***06 | Blade Group-Angling; Angling Brade Group | 1 |
Semi Universal Blade (8e5203 N/S)
| 8E***03 | Blade Group-Semi-Universal | 1 |
Semi Universal Blade (8e9325 N/S)
| 8E***25 | Blade Group-Semi-Universal; Semi-Universal Blade Group | 1 |
8e5186 Straight Blade
| 8E***86 | Blade Group-Straight | 1 |
Ripper Mounting (9w0610 N/S)
| 9W***10 | Mounting Group-Ripper | 1 |
Ripper Arrangement (9w0804 N/S)
| 3W***56 | Guard Group-Transmission; (Includes Items 15a, B & C) | 1 |
| 9T***16 | Cylinder Group-Ripper Lift; (Ripper Lift) | 1 |
| 9W***10 | Mounting Group-Ripper | 1 |
Ripper (9w1017 N/S)
| 9W***17 | Ripper Group | 1 |
Adapter (1382446 N/S)
Bar (1382447 N/S)
Brake (1207698 N/S)
| 09***71 | Pipe Plug (1/8 Npt) | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 10***83 | Plug; (Hex Socket) (1/4 Npt) (Early) (Current Brake Housing May Be Visually Distinguished From The Early Design By Locating The -6 Orb Plug At The "B" Brake Pressure Port) (The Early Design Used A Socket Head, 1/4 Npt Plug) | 4 |
Case (1382398 N/S)
| 11***72 | Winch Case - Low Power Take-Off | 1 |
| 13***98 | Case | 1 |
| 13***99 | Drive | 1 |
Clutch (1382442 N/S)
Clutch Assembly (1187210 N/S)-Type 1
Clutch Assembly (1187210 N/S)-Type 2
Clutch Shaft (1401201 N/S)
Control Valve (1740333 N/S)
Control Valve (1740334 N/S)
| 17***34 | Control Valve Assembly; (See Control Valve Assembly) (Page 21) | 1 |
Cover (1382440 N/S)
| 11***83 | Sight Gauge (Includes Item 28) | 1 |
| 11***16 | Disc; Internal Disk, Disc, Gasket | 1 |
| 11***17 | Gasket | 2 |
Cylinder Group (1382411 N/S)
Drive (1382399 N/S)
Gear (1192213 N/S)
Gear (1187837 N/S)
Hydraulic Control Group (1382401 N/S)-Part 2 Of 2
| 13***01 | Hydraulic Control | 1 |
Hydraulic Control Group (1382401 N/S)
| 13***01 | Hydraulic Control | 1 |
| 13***02 | Hydraulic Control Assembly | 1 |
Hydraulic Control Group (1382401 N/S)-Part 1 Of 2
| 13***01 | Hydraulic Control | 1 |
Hydraulic Control Assembly (1382402 N/S)
| 10***96 | Piston | 1 |
| 10***97 | Plate-Reaction | 1 |
| 11***88 | Gear-Ring; (81-Teeth) | 1 |
Idler Shaft (1382410 N/S)
Installation Arrangement (1382422 N/S)-Winch
| 13***22 | Installation Arrangement | 1 |
| 13***23 | Winch Control | 1 |
| 3W***56 | Guard Group-Transmission; (Includes Items 15a, B & C) | 1 |
Mounting (1382448 N/S)
Pump (1382444 N/S)
Shaft (1382443 N/S)
Ripper Tooth (9j8926 N/S)
| 9J***26 | Tooth Group-Ripper; -Curved | 1 |
Winch Arrangement (1382397 N/S)-Standard Speed-Freespool
| 11***37 | Gear | 1 |
| 12***98 | Brake | 1 |
| 13***97 | Winch Arrangement | 1 |
Winch Arrangement (1382453 N/S)-Slow Speed-Freespool
| 11***13 | Gear; (39/14t) (E Ratio) (Slow Speed) | 1 |
| 12***98 | Brake | 1 |
| 13***98 | Case | 1 |
Winch Gear (1382445 N/S)
D6R serial number reference
Read the 3-character prefix at the start of the machine's serial/PIN — stamped on the frame ID plate (rear frame rail on most units; a rear ripper can hide it). Pre-2001 units carry an 8-character serial (e.g. S6X01234); later units use the 17-character PIN where the same prefix + 5-digit sequence form the last 8 characters. The prefix identifies model and generation — and on many older units the steering type — but NOT the blade/undercarriage configuration (STD/XL/XW/LGP) or, on Series II, the engine: Series I (~1996–2001) used the Cat 3306 across all configs, Series II (~2001–2006) split between the 3306 ATAAC (STD) and C9 (XL/XW/LGP), and Series III runs the C9 ACERT. Always confirm the exact build with a Cat dealer using the full PIN.
| Prefix | Identifies | Notes |
|---|---|---|
| 9PN | D6R Series I (Cat 3306/3306T) | STRONG — service + parts manuals; also in Cat's differential-steering electrical-schematic group (SENR-series index). Config (STD/XL/LGP) not derivable from prefix. |
| S6X | D6R — STD/XL/LGP (grouped manuals with S6T, S6Y) | Confirmed via Cat dealer parts reference + grouped parts catalogue. Sources disagree on Series I vs II attribution — engine is PIN-dependent (3306 early, C9 later); confirm with dealer. |
| S6T | D6R — STD/XL/LGP (same manual family as S6X/S6Y) | Dealer parts guide + O&M manual grouping. Series attribution varies by source — confirm with dealer. |
| S6Y | D6R — STD/XL/LGP (same manual family as S6X/S6T) | Strongest of the group: dealer guide + dedicated parts catalogue + service manual. |
| 8TM | D6R LGP — differential steering, 3306 engine | High-confidence: a Cat LGP parts-manual title identifies it exactly, and Cat's differential-steering schematic index corroborates. |
| 6FR | D6R Series I (3306-family) | Service manual from first unit up; also appears in an O&M prefix list. |
| 6MR | D6R Series I — conventional (clutch-brake) steering | Service manual + Cat conventional-steer schematic group. |
| 4FM | D6R Series I — differential steering | Service manual + Cat differential-steering schematic group. |
| 4TR | D6R Series I (3306-family) | Service manual from first unit up. Config unspecified — confirm with dealer. |
| 4HN | D6R Series I — conventional (clutch-brake) steering | Service manual + Cat conventional-steer schematic group. |
| 4MN | D6R XL — conventional (clutch-brake) steering | Service manual + conventional-steer schematic group; XL label from a model index — confirm with dealer. |
| 9MN | D6R Series I — differential steering | Service manual + Cat differential-steering schematic group. |
| 9BM | D6R Series I — differential steering | O&M manual grouping (9BM/DMP/S6T) + differential-steering schematic group. |
| DMP | D6R Series I (possible XW arrangement) | O&M manual grouping confirms D6R; an XW tie rests on thinner sourcing — confirm config and engine with dealer. |
| 5LN | D6R — differential steering | Standalone parts manual + Cat differential-steering schematic group. |
| AEP | D6R Series II | Dedicated 'D6R II' service manual from first unit up. Series II engine varies by configuration (STD = 3306 ATAAC ≈165 hp; XL/XW/LGP = C9 ≈185 hp) — confirm by PIN. |
| BLE | D6R Series II | Series II service manual + parts manual (grouped with BMJ). Engine by configuration as above. |
| BMJ | D6R Series II | Series II parts manual (grouped with BLE). |
| BRJ | D6R Series II | Dedicated 'D6R II' service manual from first unit up. |
| BMY | D6R II XL (Cat C9, ~2001–2006) | Cross-verified across two dealer/spec sources. XL-config Series II carries the C9, not the 3306. |
| AGM | D6R Series II/III (Cat C9) | THIN — single forum attribution, no Cat manual title found. Treat as provisional; confirm with dealer. |
| AAX | D6R Series II/III (Cat C9) | THIN — same single-forum source as AGM. Provisional; confirm with dealer. |
Frequently asked questions
What engine does the Caterpillar D6R use?
It depends on the series. Series I (about 1996–2001) uses the six-cylinder Cat 3306T; Series II (about 2001–2005) keeps the 3306 (ATAAC) on the standard machine and moves the XL/XW/LGP builds to the Cat C9; Series III (about 2005–2008) uses the Cat C9 ACERT. Net ratings run from roughly 123 kW (165 hp) up to 149 kW (200 hp), varying by series and configuration.
What is the operating weight of the Caterpillar D6R?
It varies by configuration. A standard (STD) D6R runs about 18,325 kg (40,400 lb), the XL is around 20,080 kg (44,270 lb), and the low-ground-pressure LGP reaches roughly 20,500 kg (45,200 lb) at about 34 kPa (5 psi) ground pressure. Overall the machine spans roughly 18,300–20,500 kg (40,400–45,200 lb) depending on configuration and series.
What replaced the Caterpillar D6R?
The D6R was replaced by the Caterpillar D6T, phased in around 2004–2008 with a Tier 3 C9 ACERT engine. The D6R had itself replaced the earlier D6H in 1996. The modern D6 / D6 XE introduced from 2018 is a separate later generation, not the D6R's direct successor.
What D6R owners discuss
How does the D6R's differential steering actually behave, and how does it compare to the old steering-clutch-and-brake dozers operators grew up on?
The D6R uses differential steering rather than the clutch-and-brake steering of older D6 generations (D6C/D/G, etc.), and this is the single biggest behavioral difference operators talk about. With differential steering, engine power keeps flowing to BOTH tracks the whole time you're turning — the system simply speeds one track up while slowing the other down by an equal amount through a planetary/hydraulic steering arrangement driven by its own variable-displacement pump. The practical upshot, and what operators consistently praise, is that the machine holds its load and doesn't 'die' in a turn the way an old clutch-steer dozer does when you declutch a track and the blade load stalls you. You steer with a single tiller/lever and it modulates smoothly, so you can feather fine corrections around grade stakes, structures and other machines. The track-speed differential is capped (roughly 4.0 km/h / 2.5 mph between tracks), so turns are powered and progressive rather than abrupt. Two caveats the community raises: (1) the D6R will NOT spin-turn / counter-rotate the tracks in opposite directions the way a hydrostatic machine (like a D6N) can — differential steer holds power to both tracks but both keep driving the same direction, so it turns in a larger arc; and (2) because power routes through the steering differential ahead of the transmission, a diff-steer machine can creep or pull to one side if the steering circuit is applied, which surprises operators used to a track just freewheeling. Opinion is genuinely split on 'better' — most find diff-steer far more productive under load, while a few old-hands prefer the simplicity and dead-neutral feel of clutch/brake. Consensus: for a working dozer, the diff-steer D6R is more productive and much easier on the operator over a full shift.
What steering and brake problems come up most on the D6R, and what should I check first?
On the D6R the 'steering clutch' complaints of older dozers are largely gone (there are no traditional steering clutches to burn up), so the recurring items are in the service-brake and steering-circuit hydraulics and their linkage/sensors instead. The most-reported operator complaint is brakes that grab or 'lock on' the instant the pedal is touched, or that feel like they engage backwards — community diagnosis points to linkage adjustment/wear (worn ball joints, bushings and pivots throwing off the pedal-to-valve geometry) and, on the electronically controlled machines, to brake/neutralizer sensor faults that can also trip a transmission lock-out or parking-brake fault and immobilize the machine. The D6R's service brakes are oil-cooled multiple-disc units and the parking brake is spring-applied, hydraulically-released (SAHR) — so a loss of hydraulic release pressure leaves the park brake dragging or locked, and there's a documented manual-release procedure at the final drives for when the machine won't move. Before chasing internal parts, the forums stress checking fluid level and condition, linkage adjustment/wear, and pulling codes for brake and neutralizer sensors, since a cheap sensor or worn linkage pin mimics an expensive failure. Because brake behavior on a ~20-tonne crawler is safety-critical, confirm the correct band/linkage adjustment spec and torque, and have your Cat dealer verify the brake and SAHR park-brake circuit before returning the machine to service.
What undercarriage wear patterns should D6R owners expect, and how long does the undercarriage last?
Undercarriage is the D6R's biggest wear cost — the community and Cat's own guidance agree it can run to roughly half of a dozer's total owning-and-operating cost, so how you manage it dominates the machine's economics. Wear life varies enormously with conditions and cannot be pinned to a single number: soft, non-abrasive dirt is easy on it, while rocky, sandy, abrasive ground, heavy side-slope work, and constant high-speed reverse chew pins, bushings, sprockets and rollers far faster — owners describe the same chain going a few thousand hours in punishing rock versus considerably longer in good soil. On a standard (non-sealed-and-lubricated) chain the bushings are the limiter, and there is a planned pin-and-bushing turn at roughly the mid-point of chain life that exposes fresh bushing surface and effectively lets you get a second life out of the chain before replacement. Rollers and idlers on the D6R are lifetime-lubricated and can often be re-shelled/rebuilt rather than scrapped. Cat's SystemOne-style undercarriage is the alternative many buyers now prefer because its sealed cartridges are designed to wear as a system and eliminate the bushing-turn and sprocket-replacement steps entirely. The practical takeaways owners repeat: keep track tension correct (over-tight tracks accelerate wear dramatically), keep the undercarriage clean of packed mud, do regular measured wear readings rather than eyeballing it, and budget for undercarriage as a scheduled cost, not a surprise.
3306 vs C9 engine — which D6R engine do owners actually prefer, and what quirks come with each?
This is the most heated engine debate on the D6R, and community consensus leans clearly toward the older Cat 3306/3306T mechanical engine (Series I, and the STD-frame Series II) over the later C9 ACERT (bigger-frame Series II XL/XW/LGP, and Series III). The 3306 is beloved for reliability and field-serviceability: it's a proven engine that routinely runs well past 15,000–20,000 hours before a major overhaul with basic maintenance (owners cite 3306s reaching 18,000+ and even 30,000 hours in some duty cycles), and when it does have an injector or fuel-system issue you can often diagnose and fix it on the spot without a laptop. The C9 ACERT is the flashpoint: owners report it as more fragile and far more expensive to keep right, with the biggest gripes being the ACERT fuel system (costly injectors and fuel pumps) and, on the later emissions-equipped units, after-treatment complexity. Some heavy-use C9s develop piston-ring wear, cylinder-liner scoring and rising oil consumption, and repairs often force a dealer visit rather than a field fix — one widely-cited example had roughly $40,000 of warranty work paid out on a machine over about four-and-a-half years. Whatever fuel savings the C9 offers tend to get eaten by injector/pump costs and downtime, which is why many buyers specifically hunt for a 3306-powered D6R. That said, a well-maintained C9 with good service records can be fine — the warning to heed is that a neglected C9 is a much bigger financial risk than a neglected 3306. Note which engine a given machine has genuinely varies by series and configuration, so verify the actual engine on the specific unit rather than assuming from the model name.
What powershift transmission behaviors and faults show up on the D6R?
The D6R's powershift is electronically controlled — clutch fill and engagement pressures are managed by the power-train ECM and set through calibration — so the transmission complaints tend to be about shift QUALITY and dropping out of gear rather than gears grinding. The most common operator report is harsh or hard shifting when changing direction (forward↔reverse); the community's first move is a clutch-fill / engagement-pressure calibration, but they warn that if calibration only helps temporarily the real culprit is usually a worn or dirt-sensitive modulating valve (a newer-style modulating valve plus recalibration is a known fix), a bad transmission-oil temperature sensor (the ECM tailors modulation to oil temp, and if it thinks the oil is too cold — around 63–66°C / 145–150°F or below — shifts feel wrong), or worn directional-clutch friction discs. A second classic symptom is the machine dropping out of gear or refusing to pull at higher rpm: one documented case traced it to main/clutch pressure collapsing from roughly 2,930 kPa (425 psi) down to about 830 kPa (120 psi) once engine speed rose past ~1,350 rpm, so gauging the P1 (speed) and P2 (direction) clutch test points while the fault occurs is the recommended diagnostic. 'False neutral' / spontaneous neutral shifts and won't-move faults are frequently wiring-harness or speed-sensor problems that throw multiple transmission codes, so pull codes before condemning internals. A repeatedly emphasized point: use only a Cat TO-4-spec oil (e.g., Cat TDTO) — engine oil or GL-5 gear oil is too slippery and will make the clutch packs slip even at correct pressure. Because a transmission that unexpectedly drops out of gear or won't hold on a slope is a safety concern, confirm the correct calibration values and clutch pressures and have your Cat dealer verify before relying on the machine.
My D6R blade drifts or moves slowly — what causes hydraulic/blade problems on these machines?
Blade drift and slow/weak blade movement are common on higher-hour D6Rs, and the community traces them to the same short list. Blade slowly settling/dropping or a tilt that won't hold is most often internal leakage past worn cylinder rod seals or a worn/scored cylinder — fluid bleeds from one side of the piston to the other and the blade drifts, especially the tilt or angle function drifting to one side. The next suspects are the hydraulic control valve (worn spool or a stuck/leaking check) and worn blade pivot pins, ball-and-socket, and cross-brace hardware that let the blade wander even when the hydraulics are fine, so mechanical slop should be ruled in or out alongside seals. Slow or jerky blade speed across all functions usually points upstream — low or contaminated hydraulic fluid, a plugged filter/screen, air in the system, or a tired implement pump losing pressure/flow. The community's methodical approach: check fluid level and condition first (water, dirt or air in the oil will cause weak, erratic action), then do a pressure/leak-down test on both ends of the suspect cylinder to separate a leaking cylinder from a leaking valve before spending money. Rebuild cylinders with proper Cat seal kits and correct any worn pins/bushings at the same time so the repair actually holds. Keeping up the scheduled hydraulic fluid/filter service (roughly every 250–500 hours as a checkpoint) heads off most of these before they become a rebuild.
What should I check when buying a used D6R?
The community's used-D6R checklist puts undercarriage first, engine choice second, and documented service history throughout. (1) Undercarriage: never buy without a measured wear report on chains, bushings, sprockets, rollers and idlers — since undercarriage can be ~50% of operating cost, a worn-out set can be a five-figure surprise that swings the whole deal; check for correct, even track tension and look at reverse/abrasive wear patterns that hint at hard prior use. (2) Engine: confirm the ACTUAL engine on that specific unit (3306 vs C9 ACERT varies by series and configuration) — many buyers deliberately prefer a 3306-powered machine for serviceability, and if it's a C9 you want strong maintenance records and to watch for oil consumption, blow-by and after-treatment history. (3) Fluid samples: pull oil samples (engine, transmission, hydraulics, final drives) and have them analyzed — this is the single best early-warning of internal wear, coolant-in-oil, or fuel dilution before you commit. (4) Final drives: early D6Rs were known for final-drive carrier/planetary-shaft pins working loose and weeping oil (later production tightened the press-fit) — check both finals for oil seepage and any prior repair, and look for a machine that pulls evenly with no side-drift. (5) Leaks & overheating: verify nothing drips at rest or running, and probe any overheating history (weak coolant mix and water-pump cavitation are documented on these). (6) Transmission & steering: drive it — shift forward/reverse and through the gears feeling for harsh shifts or drop-out, and confirm brakes and the SAHR park brake hold and release properly. (7) Hours & overhaul math: expect to budget for engine/transmission overhaul consideration somewhere around 15,000–20,000 hours, and treat rising oil consumption or transmission slipping as signs that work is near. Finally, get the service/inspection records (a Cat dealer can often provide history) — a documented, well-maintained machine is worth paying a premium for over a cheaper unit with an unknown past.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific D6R part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.