Caterpillartrack-type tractorbackhoe
Caterpillar D3
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar D3 covered here is the original small-frame track-type tractor built from 1973 into 1979, predating the current-production small-dozer line that later reused the D3 name. It carries the Cat 3204 four-cylinder diesel, a naturally aspirated engine with mechanical governor-controlled fuel injection, rated around 46 kW (62 hp), paired with a three-speed powershift transmission and clutch-and-brake steering acting through final drives to the sprockets. Operating weight runs roughly 4.7 to 6 tonnes (about 10,300 to 13,000-plus lb) depending on configuration: standard-gauge undercarriage (79U prefix), low ground pressure LGP with wider track shoes (83U), and other factory build series (82U, 06N). Caterpillar also offered the D3 as a tractor-loader-backhoe, sharing chassis and powertrain commonality with the contemporary Cat 931 track loader. This generation was replaced by the D3B at the end of the 1970s.
What makes this generation notable is its mechanical simplicity: no electronic controls, no sensors, just a governed injection pump, a powershift valve body, and clutch-and-brake steering that a field mechanic can diagnose by ear and feel. Over 45 years on, that simplicity is exactly why examples still work in developing markets where diagnostic tooling and dealer support are scarce, and why the model draws steady interest from vintage-equipment collectors and restorers. Factory parts support has thinned with age, so keeping one running now depends on a mix of remaining new-old-stock, remanufactured wear items (steering clutch discs, injection pump components, undercarriage), and machined-to-fit replacements sourced outside standard dealer counters.
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 D3 specifications
Engine
| Engine model | Cat 3204, inline 4-cylinder, 4-stroke-cycle diesel, naturally aspirated |
| Displacement | 5.2 L (317 cu in) per equipment build records for this tractor; generic 3204 engine-family literature lists 4.4 L (269 cu in) for other bore/stroke arrangements of the same base engine. Confirm against the engine arrangement number on the data plate. |
| Bore and stroke | 108 mm x 127 mm (4.25 in x 5.00 in), typical for this engine family |
| Rated power | Approx. 62 hp / 46 kW gross at rated speed (standard configuration) |
| Fuel system | Mechanical direct injection; camshaft-driven distributor-type injection pump with multi-hole injectors. No electronic controls. |
| Governor | Mechanical, min-max or variable-speed all-speed type |
| Compression ratio | Approx. 16.5:1 (typical for this engine family; verify against specific arrangement) |
| Net dry engine weight | Approx. 500 kg (1,100 lb), engine only, no fluids or accessories |
| Production span | Approx. 1973-1979, built in Japan, predecessor to the D3B |
| Serial number prefixes | 79U (standard gauge, main production run), 83U (LGP / extreme-service undercarriage). Less-documented prefixes 06N and 82U are also associated with this model; treat as secondary until confirmed against your specific unit's plate. |
Weights
| Operating weight, standard gauge | Approx. 4,670-5,900 kg (10,300-13,000 lb), bare tractor with blade, depending on equipped attachments |
| Operating weight, LGP configuration | Not independently documented for this vintage series in accessible records. Expect a modest increase over standard gauge from the wider track group and shoes; verify against the parts/operation manual for the 83U prefix |
| Weight note | A figure of approximately 14,000 kg (30,800 lb) is sometimes published for this model, but that sits far outside the weight class implied by the engine rating and by the successor D3B's documented range (approx. 5,100-6,900 kg / 11,300-15,160 lb); treat it as unreliable rather than a genuine spec for this vintage tractor |
Dimensions
| Length, with dozer blade | Approx. 3.68 m (12 ft 1 in) |
| Length, tractor only (no blade) | Approx. 2.77 m (9 ft 1 in) |
| Width over tracks, standard gauge | Approx. 1.78 m (5 ft 10 in) |
| Height to top of hood/cab | Approx. 1.70 m (5 ft 7 in) |
| Track gauge, standard | Approx. 1.42 m (4 ft 8 in) |
| Track shoe width, standard | Approx. 305 mm (12 in) grouser shoe |
| Track shoe width, LGP | Wider grouser shoe fitted for the 83U low-ground-pressure undercarriage; exact width not independently confirmed for this vintage series |
| Ground clearance | Approx. 0.31 m (12 in) |
| Track contact length on ground | Approx. 1.83 m (6 ft) |
| Dimensions note | Caterpillar reused the D3 name for an unrelated current-production small dozer introduced in 2020, a different machine with different dimensions. Treat the length/width/height figures above as approximate for this vintage 1970s tractor and cross-check against a period operation manual where precision matters. |
Performance
| Transmission | Powershift, 3 forward speeds / 1 reverse speed |
| Maximum forward travel speed (top gear) | Approx. 11.4 km/h (7.1 mph) |
| Reverse travel speed | Approx. 5.1 km/h (3.2 mph) |
| Individual gear speeds (1st/2nd) | Not documented in accessible sources for this vintage; only top-gear forward and single reverse speed are consistently published |
| Ground pressure, standard gauge | Approx. 54 kPa (7.9 psi), typical for the standard shoe/undercarriage combination on this weight class. Treat as approximate and confirm against a period spec sheet for your exact configuration |
| Ground pressure, LGP configuration | Lower than standard gauge by design (wider shoes, greater ground contact area); exact figure not independently documented for this vintage series |
| Drawbar pull | Not published in accessible sources for this model/vintage. Consult the factory performance chart or a dealer for rated drawbar pull by gear |
| Gradeability | Not documented in accessible sources for this vintage. Typical of this machine class and undercarriage, but no verified factory figure found |
Blades and attachments
| Standard equipment | Factory dozer blade (straight configuration); this was the standard attachment for the model |
| Blade capacity | Not reliably documented for this specific vintage without risk of confusion with the unrelated current-production D3's blade options. Consult the period specalog or parts manual for the exact blade width/capacity code fitted to your unit |
| Tractor-loader-backhoe (TLB) configuration | This model was also factory-offered as a tractor-loader-backhoe. The parts catalog for this machine carries backhoe boom, bucket, stick, and stabilizer cylinder groups alongside loader groups, confirming the backhoe-capable configuration shared with the companion 931 track loader |
| Backhoe hydraulics | Backhoe operation calls for the higher-capacity implement pump option, rated around 22 US gpm at 2500 psi (versus the standard base-machine hydraulic circuit), to give adequate boom/stick/bucket cycle speed |
Service capacities summary
| Fuel tank | Approx. 114 L (30 US gal) |
| Hydraulic system (implement circuit) | Approx. 30-57 L (8-15 US gal) depending on source/series; open-center system rated around 172 bar (2,500 psi) with pump flow near 55 L/min (14.5 US gpm) |
| Powershift transmission oil | Approx. 17 L (18 US qt) |
| Engine oil (with filter change) | Approx. 9.5 L (2.5 US gal) |
| Cooling system | Approx. 12 L (3.2 US gal) engine-side; total system volume depends on radiator/piping and is not separately published |
| Electrical system | 12V system, alternator charging, rated approx. 40 amps |
| Fluid specification notes | Use Caterpillar-spec diesel engine oil (Cat DEO or equivalent API CD/CE-rated oil, commonly SAE 15W-40), Cat TDTO-class transmission/hydraulic oil, and standard Cat coolant/antifreeze for this era of machine. Confirm exact grade against the machine's lubrication chart |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D3 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not independently confirmed for the original D3 (S/N 79U/6N prefix, pre-D3B). The related D330/3204-family 4-cylinder diesel used in the successor D3B lists 12 L (3.2 gal); treat that as an approximate reference figure only, not a confirmed D3 number. Confirm against the OMM or parts book for your serial prefix. | Cat diesel engine oil (Series 3 / Cat DEO-equivalent, API CD-class for the era). Viscosity by ambient temperature per period Cat guidance: SAE 10W below 0°C (32°F), SAE 30 for 0-25°C (32-77°F), SAE 10W-30 multigrade where temperatures swing across that range. |
| Cooling system | Not confirmed for the original D3 in available literature. Same-class D330 4-cylinder engine data and D3B-family figures suggest roughly 19-20 L (5.0-5.3 gal), but no D3-specific number could be verified. Confirm against the OMM for your serial prefix. | Cat permanent-type antifreeze/coolant (glycol-based, DEAC-equivalent for the era) with corrosion inhibitor, mixed to protect against the lowest expected ambient temperature. |
| Fuel tank | 113.6 L (30 gal) | No. 2-D diesel fuel. No. 1-D diesel recommended in cold weather (below roughly 0°C/32°F) to reduce fuel waxing/gelling. |
| Power shift transmission | Approx. 17 L (4.5 gal) per cross-referenced parts/service data for the 79U-prefix D3. Treat as approximate pending direct confirmation from the OMM for your machine. | Cat TDTO (Transmission/Drive Train Oil), SAE 30, or a TO-2/TO-4-spec 30-weight equivalent. Cat TDTO exceeds the TO-4 spec and is formulated to extend powershift friction-material life. Thinner viscosity (10W or 10W-30) suited to sustained sub-freezing operation. |
| Bevel gear and steering clutch compartment | Approx. 15 L (4 gal) per cross-referenced parts/service data. Approximate; confirm against the OMM. This compartment is checked and filled separately from the power shift transmission case even though the same oil spec applies. | Cat TDTO 30W, or a TO-2/TO-4-spec 30-weight equivalent (same specification family as the power shift transmission). |
| Final drive (each side) | 9.5 L (2.5 gal) per side. Fill only to the centerline check plug; the large square-head plugs are level checks, not fill points, and overfilling is a common mistake. | Cat TDTO 50W or 60W, or a TO-4-spec 50W/60W gear oil. Straight engine oil of the same weight is an accepted substitute for this compartment per Cat guidance. |
| Hydraulic/steering control system | 30 L (8 gal) | Cat HYDO 10W hydraulic oil, or an AW-32-spec equivalent. |
| Pivot shaft / equalizer bar | Grease point only, no fill-volume specification. Lubricated through a remote fitting serving both end-pin bearings. | Cat Multipurpose Grease (NLGI 2 EP). Switch to a softer NLGI 1 equivalent for sustained sub-zero climates to ease gun pumpability. |
| Grease specification (general chassis/track fittings) | Applied per standard grease-gun interval at all chassis, track, and linkage zerks; no single reservoir volume applies. | Cat Multipurpose Grease (NLGI 2 EP) for general use; NLGI 1 equivalent in cold climates. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar D3 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the D3 beyond the schedule
Predictive Maintenance & Fluid Analysis
This machine predates onboard diagnostics, so predictive care on a D3 means scheduled sampling and observation. Pull periodic oil samples from the 3204 crankcase, powershift/steering clutch compartment, and final drives to catch wear metal before it becomes a failure. Watch exhaust smoke color for injection pump or ring wear, listen for steering clutch slip under load, and track sag as an undercarriage wear indicator. Coolant condition and antifreeze strength should be checked on the same schedule as oil, since the 3204's cast-iron block is unforgiving of neglected corrosion inhibitor.
Corrective & Common Repairs
Typical D3 complaints trace to the steering clutch and brake compartment: worn fiber discs, a sticking hydraulic release valve, or a brake band needing readjustment show up as pull-to-one-side steering or soft braking. On the 3204, hard starting and blue-gray smoke usually point to worn injectors or a tired injection pump needing recalibration. Also check the water pump and radiator core for age-related leaks, final drive seals for oil weep, and track pins and bushings for pitch stretch on higher-hour machines.
Overhaul & Rebuild Points
At high hours, plan for a steering clutch compartment rebuild: fiber discs, springs, and the release yoke wear as a set and are best replaced together rather than piecemeal. Engine overhaul on the 3204 covers liners, pistons, and a bench recalibration of the injection pump and governor linkage. The powershift transmission's clutch packs and modulating valves wear with hour count and warrant inspection at rebuild. Undercarriage overhaul, chain, rollers, idlers, and sprockets, is the other major rebuild point once track sag can no longer be adjusted out.
Seasonal & Environment Servicing
Cold starts on a mechanical-governor 3204 rely on disciplined ether use, short bursts while cranking, not continuous spray, plus correct antifreeze concentration and a warmed-up idle before working the machine. Check and reset track tension for frozen or thawing ground, since sag targets shift with soil grip. In dusty, hot climates, clean the radiator core and air cleaner more often and drain the fuel tank sump more frequently, since sediment and condensation both foul the mechanical injection system faster than in a temperate climate.
D3 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 8T-2475 | Transmission Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D3 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Coolant temperature gauge needle sitting in the gauge's red segment | Engine coolant temperature has risen above the normal operating band (mechanical Cat gauges of this era typically run normal in the 82-99°C / 180-210°F band, with the red segment starting somewhere around 99-110°C / 210-230°F depending on gauge and dash calibration) | Radiator core packed with mud or debris, stuck-closed thermostat/regulator, trapped air in the cooling system after service, low coolant level, or worn water pump bearing letting the fan wobble and lose airflow | Shut down and let cool; check coolant level and clear radiator fins/core of debris; confirm thermostat opens at spec; bleed air from the system per the fill procedure; check fan/water pump bearing for wobble or play |
| Oil pressure gauge low or near zero (warning light/buzzer on machines so equipped) | Insufficient lubrication pressure reaching engine bearings | Worn oil pump or increased main/rod bearing clearance from wear, low oil level, oil pump inlet screen or relief valve stuck open (often shows first at low idle), or a faulty gauge/sending unit rather than an actual pressure loss | Verify actual pressure with a mechanical test gauge before condemning the sender; check oil level and condition; if confirmed low, inspect oil pump, inlet screen, and bearings |
| Engine cranks but will not fire, especially in cold weather | Insufficient heat/compression to ignite the fuel charge on start-up; this covers both the pre-1978 precombustion-chamber (glow plug) version of the 3204 and the direct-injection version introduced partway through the D3 production run | Worn rings/cylinders reducing compression, weak or fouled glow plugs (precombustion-chamber engines) not bringing the chamber to heat, air trapped in the fuel system, or cold ambient temperature compounding mechanical wear | On precombustion-chamber (glow-plug) engines, preheat with the glow plugs per the machine's procedure and do not use ether/starting fluid at the same time the glow plugs are energized, since ether ignited against a hot glow plug can backfire the intake and break plug tips; check and replace glow plugs if they are not reaching full heat. On direct-injection engines fitted with a starting-fluid aid, use it per the machine's procedure. On either version, bleed air from the fuel system and run a compression test if hard starting persists |
| Black or gray exhaust smoke under load | Incomplete combustion from a rich fuel mixture or off-spec injection timing | Clogged air filter restricting intake air, worn or faulty injector nozzles, or injection pump timing out of specification | Inspect and replace the air filter, check injector spray pattern and condition, verify injection pump timing against the specified procedure |
| Engine surging or rough, unstable idle | Fuel rack/governor not holding steady fuel delivery | Governor flyweight/spring linkage or fuel rack sticking (worn rack bushings are a common wear point), a blocked governor oil-supply screen from dirty or varnished engine oil since oil lubricates the governor internals, or an air leak on the low-pressure side of the fuel system | Check the fuel rack for free movement at the pump housing access cover while working the throttle, change engine oil and filter and check the governor oil-supply screen for blockage, inspect low-pressure fuel lines and fittings for air leaks, inspect governor linkage for binding |
| Starter cranks intermittently, or continues running/turns hot after the engine starts | Fault in the starting circuit rather than the engine itself | Faulty or miswired starter solenoid, or a poor ground connection between the battery negative terminal and the engine block; this pairing of symptoms has been documented on this machine specifically | Test continuity from battery negative to engine block, inspect solenoid wiring and contacts, confirm the ignition/start switch is not sticking |
| Powershift transmission oil temperature gauge climbing quickly into the red zone under load | Torque converter/transmission fluid overheating | Operating in too high a gear for the load (lugging the converter), low or degraded transmission fluid, a clogged transmission oil cooler, or dragging brakes | Downshift to the lowest practical gear for the load, check transmission fluid level and condition against the TO-4-type spec, clean the cooler core, check brake adjustment |
| Track sag outside spec, or audible squeal/clatter from the undercarriage | Improper track tension, or a dry/failing pin-bushing joint | Too loose causes bounce, vibration, and chain snaking that risks derailing; too tight accelerates roller, idler, and bushing wear. Squealing points to a dry joint: on older non-sealed track this can mean the joint needs periodic lubrication, while on sealed-and-lubricated (SALT) track a dry, noisy joint usually means a failed pin seal rather than something a grease gun fixes, and points toward a track turn or rebuild | Measure sag with a straightedge against the manual's spec, adjust tension at the idler/recoil grease fitting; if joints run dry, lubricate them if the undercarriage is the older non-sealed type, or plan a pin/bushing turn if it is sealed-and-lubricated track with failed seals |
| Diesel fuel odor in crankcase oil, or oil level rising between changes | Fuel is diluting the engine oil | Worn injector seals or a failing injection pump allowing fuel to leak past into the crankcase; owners of this engine have traced the same symptom to both the fuel transfer pump and the injection pump | Check oil for fuel smell or dilution at each service interval, inspect/pressure-test the injectors and the transfer and injection pump seals, replace as needed and change the diluted oil |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
D3 attachments & work tools
Blades
Standard-gauge D3 tractors (79U prefix) took a front dozer blade in straight or angling arrangement sized for general grading and utility dozing; the LGP undercarriage version (83U prefix) paired a wider track gauge and shoe for lower ground pressure in soft footing. Published blade width and capacity figures vary by configuration and source - confirm exact blade fit against the serial number with your dealer before ordering cutting edges or end bits.
Loader
Factory front loader arrangement follows the tractor-loader-backhoe build shared with the contemporary Caterpillar 931 track-type loader (same Japan-built chassis family, heavy parts commonality). Loader bucket runs in the roughly 0.8 cu m (about 1.1 cu yd) class, single general-purpose bucket, cross-shaft lift linkage raised and tilted by the tractor's own hydraulic bank rather than a separate power unit.
Backhoe
Rear backhoe attachment bolts on in place of the drawbar/ripper and is documented in its own dedicated parts catalog alongside the D3 tractor and 931 loader. Arrangement is boom, dipperstick, and bucket with a pair of rear stabilizer/outrigger legs for dig stability; digging depth and reach figures are not consistently documented for this exact vintage build - treat published third-party numbers as approximate and verify against the specific serial range.
Rippers
Rear ripper options for this class run single-shank or multi-shank (parallelogram-style, two to three teeth). Single-shank gives better penetration in hard, frozen, or rocky ground; multi-shank suits lighter, more favorable soil where production matters more than penetration. Shank spacing and beam style are sized for the D3's class and are not interchangeable with later D3B/D3C ripper hardware.
Winches
An optional rear-mounted cable control unit (Caterpillar's term for what other makers called a power control unit) was available for towing and skidding work, driven off the tractor's own powertrain rather than a bolt-on hydraulic pump. Line-pull and drum capacity figures are not reliably documented for this specific vintage build across available sources - varies by winch model fitted, verify before specifying cable.
Drawbars/Counterweights
A rear drawbar was the standard fitment when neither ripper, winch, nor backhoe occupied the rear of the tractor, used for towing and light pull work. Front counterweight ballast was offered to rebalance the machine when a heavier rear attachment (ripper or winch) was fitted, keeping steering and traction even front to rear.
ROPS/Canopy
Operator protection on this generation was a two-post ROPS structure, offered either open with a sunshade/FOPS canopy overhead or with a factory enclosed cab option that included heat. Canopy and cab both mount to the same ROPS frame rather than being separate structures.
Hydraulic Arrangement
Base machine hydraulics are open-center: roughly 30 L (8 US gal) reservoir, about 172 bar (2500 psi) relief setting, and pump flow near 55 L/min (14.5 gpm) feeding blade lift/tilt or loader raise/tilt. The parts catalog for this machine documents both a 3-valve control bank (blade or loader: raise/lower, tilt, angle) and a 4-valve bank that adds a section for a rear tool; ripper and winch circuits are shown as their own dedicated valve sections rather than folded into the base blade/loader bank.
All D3 assemblies by section
Every catalogued assembly group for the Caterpillar D3. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
4n7914 Air Cleaner Group
| 4N***14 | Air Cleaner Group | 1 |
4n0307 Air Cleaner Group
| 4N***07 | Air Cleaner Group | 1 |
4n0312 Exhaust Extension Group
| 4N***12 | Extension Group-Exhaust | 1 |
1w5054 Air Lines Group
| 1W***54 | Lines Group-Air; Air Lines Group | 1 |
7n4971 Exhaust Manifold Group
| 7N***71 | Manifold Group-Exhaust; Exhaust Manifold Group | 1 |
7n4970 Muffler Group
| 7N***70 | Muffler Group | 1 |
5m2735 Prescreener Group
| 5M***35 | Prescreener Group; Prescreener Group----------------------. | 1 |
Basic Engine
6n2393 Camshaft Group
| 6N***93 | Camshaft Group-Single; Camshaft Group-Single | 1 |
2w7486 Valve Mechanism Cover Group
| 2W***86 | Cover Group-Valve Mechanism; Valve Mechanism Cover Group | 1 |
Crankshaft Bearing Replacements
| 1W***55 | Bearing (0.25mm Undersize) | 1 |
| 1W***56 | Bearing (0.51mm Undersize) | 1 |
| 1W***57 | Bearing (1.27mm Undersize) | 1 |
7w3926 Crankshaft Group
| 7W***26 | Crankshaft Group; Crankshaft Group | 1 |
1w4327 Cylinder Block Assembly
| 1W***27 | Cylinder Block As | 1 |
2w7902 Cylinder Block Assembly
| 2W***02 | Cylinder Block As | 1 |
1w4326 Cylinder Block Group
| 1W***26 | Cylinder Block Group; Cylinder Block Group | 1 |
7w9390 Cylinder Head As
| 7W***90 | Cylinder Head As | 1 |
7c2320 Head As-Cylinder Service*R
| 7C***20 | Cylinder Head As | 1 |
1w2280 Cylinder Head Group
| 1W***80 | Cylinder Head Group | 1 |
6n2467 Cylinder Head Group*R
| 6N***67 | Cylinder Head Group; Cylinder Head Group | 1 |
6n2467 Cylinder Head Gp*R
| 6N***67 | Cylinder Head Group; Cylinder Head Group | 1 |
7w9392 Cylinder Head Gp*R
| 7W***92 | Cylinder Head Group | 1 |
7n5141 Fan Drive Group
| 7N***41 | Drive Group-Fan; Water Pump Drive Group | 1 |
7n6937 Flywheel Group
| 7N***37 | Flywheel Group; Flywheel Group | 1 |
1w1355 Front Gear Group
| 1W***55 | Gear Group-Front; Front Gear Group | 1 |
7n6344 Flywheel Housing Group
| 7N***44 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
2w4384 Front Housing Group
| 2W***84 | Housing Group-Front; Front Housing Group | 1 |
1w5554 Engine Lifting Group
| 1W***54 | Lifting Group | 1 |
6n8370 Oil Pan Group
| 6N***70 | Pan Group-Oil; Oil Pan Group | 1 |
8n4079 Connecting Rod And Piston Group-4 Required
| 8N***79 | Piston & Rod Group; Connecting Rod And Piston Group | 1 |
2w8419 Piston Group
| 2W***19 | Piston Group | 1 |
7n5138 Crankshaft Pulley Group
| 7N***38 | Pulley Group-Crankshaft; Auxiliary Drive Pulley Group | 1 |
4n0300 Engine And Transmission Support Group
| 4N***00 | Support Group-Engine & Tmsn | 1 |
1w5720 Valve Mechanism Group
| 1W***20 | Valve Mechanism Group; Valve Mechanism Group | 1 |
Cab, Gauges And Accessories
7v9507 Seat Belt Group
| 7V***07 | Seat Belt Group | 1 |
7v9506 Seat Belt Group
| 7V***06 | Seat Belt Group | 1 |
8y4037 Seat Belt Gp
| 8Y***37 | Seat Belt Group | 1 |
5g1020 Dash Group
| 5G***20 | Dash Group | 1 |
5g5888 Gauge Group
| 5G***88 | Gauge Group | 1 |
5g2341 Hydraulic Oil Temperature Gauge Group
| 5G***41 | Gauge Group-Hydraulic Oil Temp; Hydraulic Oil Temperature Gauge Group | 1 |
5g0949 Vandalism Guard Group
| 5G***49 | Guard Group-Vandalism | 1 |
5g2988 Assist Handle Group
| 5G***88 | Handhold Group; Handle Group--Assist | 1 |
4n0481 Electric Hour Meter Group
| 4N***81 | Meter Group-Hour | 1 |
5g0673 Roll Over Protective Group
| 5G***73 | Rops Group | 1 |
5g5889 Seat & Support Gp-Part 2 Of 2
| 5G***89 | Seat & Support Group | 1 |
5g5889 Seat & Support Gp-Part 1 Of 2
| 5G***89 | Seat & Support Group | 1 |
6s7596 Seat Gp-Part 2 Of 2
| 6S***96 | Seat Group | 1 |
6s7596 Seat Gp-Part 1 Of 2
| 6S***96 | Seat Group | 1 |
5g2334 Seat Gp-Reversible
| 5G***34 | Seat Group; Reversible Seat Group | 1 |
6s3626 Suspension Seat Group
| 6S***26 | Seat Group-Suspension; Suspension Seat Group------------------- | 1 |
2v7961 Suspension As-Seat
| 2V***61 | Suspension As-Seat | 1 |
Chassis And Undercarriage
5g1136 Lift Cylinder Brace Group
| 5G***36 | Brace Group-Lift Cylinder; Lift Cylinder Brace Group | 1 |
6s9359 Track Cleaner Bar Group
| 6S***59 | Cleaner Bar Group | 1 |
5g0796 Counterweight Group-204 Kg (450 Lbs.)
| 5G***96 | Counterweight Group | 1 |
5g0797 Counterweight Group-340 Kg (750 Lbs.)
| 5G***97 | Counterweight Group | 1 |
5g0441 Front Counterweight Group-386 Kg (850 Lbs.)
| 5G***41 | Counterweight Group-Front | 1 |
5g2628 Sprocket Counterweight Group
| 5G***28 | Counterweight Group-Sprocket | 1 |
5g0779 Drawbar Group
| 5G***79 | Drawbar Group; (Fixed) | 1 |
5g4328 Engine Enclosure Group
| 5G***28 | Enclosure Group-Engine | 1 |
5g4019 Engine Enclosure Group
| 5G***19 | Enclosure Group-Engine | 1 |
5g0060 Loader Frame Group
| 5G***60 | Frame Group-Loader | 1 |
5g4383 Track Roller Frame Group
| 5G***83 | Frame Group-Track Roller | 1 |
5g4397 Frame Gp-Track Roller
| 5G***97 | Frame Group-Track Roller | 1 |
5g1185 Bottom Guard Group
| 5G***85 | Guard Group-Bottom | 1 |
5g2342 Brush Guard Group-Side
| 5G***42 | Guard Group-Brush | 1 |
5g2327 Brush Guard Group-Rear
| 5G***27 | Guard Group-Brush | 1 |
5g0465 Radiator Guard Group
| 5G***65 | Guard Group-Radiator | 1 |
6s6166 Hinged Radiator Guard Group
| 6S***66 | Guard Group-Radiator Hinged; Radiator Hinger Guard Group | 1 |
6s8323 Radiator Guard Group-Hinged-Heavy Duty
| 6S***23 | Guard Group-Radiator Hinged | 1 |
5g4371 Guard Gp-Recoil
| 5G***71 | Guard Group-Recoil Mechanism | 1 |
5g4374 Guard Gp-Track Roller
| 5G***74 | Guard Group-Track Roller | 1 |
5g4308 Hood And Guard Group
| 5G***08 | Hood & Guard Group | 1 |
6s3864 Front Pull Hook Group
| 6S***64 | Hook Group-Front Pull | 1 |
5g4380 Idler Gp-Front-Part 1 Of 2
| 5G***80 | Idler Group-Front | 1 |
5g4380 Idler Gp-Front-Part 2 Of 2
| 5G***80 | Idler Group-Front | 1 |
6y1511 Link As-Track
| 6Y***11 | Link As-Track | 1 |
6t2133 Link Assembly
| 6T***33 | Link As-Track | 1 |
3t6705 Link As-Track
| 3T***05 | Link As-Track; Track Link Assembly | 1 |
6y1513 Link As-Track
| 6Y***13 | Link As-Track | 1 |
5g0460 Roll-Over Protective Structure Mounting Group
| 5G***60 | Mounting Group-Rops | 1 |
3t4352 Roller Gp-Single Flange-6 Required
| 3T***52 | Roller Group-Track; Single Flange Track Roller Group | 1 |
3t4353 Roller Gp-Double Flange-4 Required
| 3T***53 | Roller Group-Track; Double Flange Track Roller Group | 1 |
6s3609 Roller Gp-Track Carrier
| 6S***09 | Roller Group-Track Carrier; Track Carrier Roller Group | 1 |
5g2987 Heat Shield Group
| 5G***87 | Shield Group-Heat; Shield Group--Heat | 1 |
5g0377 Undercarriage Support Group
| 5G***77 | Support Group-Undercarriage | 1 |
5g0379 Support Gp-Undercarriage
| 5G***79 | Support Group-Undercarriage | 1 |
5g2236 Sweep Group
| 5G***36 | Sweep Group | 1 |
Track Group-2 Required-Sealed & Lubricated
| 3T***04 | Track Group | 2 |
| 3T***05 | Link As-Track; Track Link Assembly | 1 |
| 6T***33 | Track Group | 2 |
6y1672 Track Gp-2 Required
| 4K***38 | Bolt-Track (9/16-18 X 1.625 In); Bolt-Track-(9/16 X 18 X 1.6 In) | 144 |
| 6Y***11 | Link As-Track | 1 |
| 6Y***94 | Shoe-Track | 36 |
6y1678 Track Gp
| 4K***38 | Bolt-Track (9/16-18 X 1.625 In); Bolt-Track-(9/16 X 18 X 1.6 In) | 72 |
| 5A***87 | Bolt-Track-( 9/16 X 18 X 3.0 In) | 72 |
| 6S***02 | Shoe-Master Lgp Track | 1 |
Cooling System
1n4903 Engine Oil Cooler Group
| 1N***03 | Cooler Group-Engine Oil; Engine Oil Cooler Group | 1 |
5g2765 Hydraulic Cooler Group
| 5G***65 | Cooler Group-Hydraulic Oil | 1 |
7n9989 Blower Fan Group
| 7N***89 | Fan Group-Blower | 1 |
4n2220 Suction Fan Group
| 4N***20 | Fan Group-Suction; Suction Fan Group | 1 |
6n9125 Heater Gp-Jacket Water (750 Watt, 120 Volt)
| 6N***25 | Heater Group-Jacket Water | 1 |
6n9739 Heater Gp-Jacket Water (750 Watt, 120 Volt)
| 6N***39 | Heater Group-Jacket Water; Jacket Water Heater Group | 1 |
4n0188 Water Lines Group
| 4N***88 | Lines Group-Water; Water Lines Group | 1 |
4n0660 Pump Gp-Water
| 4N***60 | Pump Group-Water; Water Pump Group | 1 |
8n4077 Radiator Group
| 8N***77 | Radiator Group; Radiator Group | 1 |
8n5864 Radiator Group
| 8N***64 | Radiator Group | 1 |
8n3082 Radiator Group
| 8N***82 | Radiator Group | 1 |
Engine Arrangement
4w8350 Engine Arrangement-Part 2 Of 2
| 1N***03 | Cooler Group-Engine Oil; Engine Oil Cooler Group | 1 |
| 1W***05 | Lines Group-Fuel Injection; Fuel Injection Lines Group | 1 |
| 1W***63 | Alternator Group-Charging | 1 |
4w8350 Engine Arrangement-Part 1 Of 2
| 1N***24 | Filter Group-Oil; Oil Filter Group | 1 |
| 1W***67 | Gauge Group-Oil Level (Dipstick) | 1 |
| 1W***55 | Gear Group-Front; Front Gear Group | 1 |
Fuel System And Governor
2w0262 Camshaft Assembly-21 Degrees
| 2W***62 | Camshaft As | 1 |
6s8967 Governor Control Group
| 6S***67 | Control Group-Governor | 1 |
1w6680 Fuel Filter Group
| 1W***80 | Filter Group-Fuel; Fuel Filter Group | 1 |
1w8730 Governor Group-Part 1 Of 3
| 1W***30 | Governor Group | 1 |
1w8730 Governor Group-Part 3 Of 3
| 1W***30 | Governor Group | 1 |
1w8730 Governor Group-Part 2 Of 3
| 1W***30 | Governor Group | 1 |
5g4583 Fuel Lines Group
| 5G***83 | Lines Group-Fuel | 1 |
7n0042 Fuel Injection Lines Group
| 7N***42 | Lines Group-Fuel Injection | 1 |
1w4105 Fuel Injection Lines Group
| 1W***05 | Lines Group-Fuel Injection; Fuel Injection Lines Group | 1 |
6s9980 Vandalism Protection Group-Fuel Tank
| 6S***80 | Protection Group-Vandalism | 1 |
1w6539 Fuel Injection Pump Group
| 1W***39 | Pump Group-Fuel Injection | 1 |
2w0263 Fuel Injection Pump Group
| 2W***63 | Pump Group-Fuel Injection | 1 |
4n4314 Pump Gp-Fuel Priming
| 4N***14 | Pump Group-Fuel Priming; Fuel Priming Pump Group | 1 |
1w0568 Fuel Transfer Pump Group
| 1W***68 | Pump Group-Fuel Transfer | 1 |
2w4403 Fuel Transfer Pump Group
| 2W***03 | Pump Group-Fuel Transfer; Fuel Transfer Pump Group | 1 |
7w0189 Governor And Fuel Injection Pump Group
| 7W***89 | Pump Group-Gov & Fuel Inj; Governor & Fuel Injection Pump Group | 1 |
5g5909 Fuel Tank Gp
| 5G***09 | Tank Group-Fuel | 1 |
4w5063 Torque Control Gp
| 4W***63 | Torque Control Group | 1 |
Hydraulic System
9g9288 Protection Cover Group-Hydraulic Tank Cap
| 9G***88 | Protection Cover Group; -Hydraulic Tank-Steering Tank Fill Cap-Hydraulic Tank Fill Cap | 1 |
3y6885 Actuator Group
| 3Y***85 | Actuator Group | 1 |
4t0412 Rotary Actuator Group
| 4T***12 | Actuator Group-Rotary | 1 |
3y6884 Rotary Actuator Group
| 3Y***84 | Actuator Group-Rotary | 1 |
5g3761 Swing Actuator Group
| 5G***61 | Actuator Group-Swing; Swing Actuator Group | 1 |
5g2464 Swing Actuator Group
| 5G***64 | Actuator Group-Swing; Swing Actuator Group | 1 |
5g0332 Hydraulic Hand Control Group-Front
| 5G***32 | Control Group-Hydraulic Hand | 1 |
5g0331 Hydraulic Hand Control Group
| 5G***31 | Control Group-Hydraulic Hand | 1 |
5g0333 Hydraulic Hand Control Group-Ripper
| 5G***33 | Control Group-Hydraulic Hand; Hydraulic Hand Control Group-Ripper | 1 |
5g0583 Hydraulic Hand Control Group
| 5G***32 | Control Group-Hydraulic Hand | 1 |
| 5G***83 | Control Group-Hydraulic Hand; Control Gp-Hydraulic Attachment | 1 |
| 6S***81 | Film-Instruction; (Instruction) | 1 |
5g0585 Hydraulic Hand Control Group
| 5G***32 | Control Group-Hydraulic Hand | 1 |
| 5G***33 | Control Group-Hydraulic Hand; Hydraulic Hand Control Group-Ripper | 1 |
| 5G***85 | Control Group-Hydraulic Hand; Control Gp-Hydraulic Attachment | 1 |
7g6798 Winch Control Group
| 7G***98 | Control Group-Winch; Winch Hydraulic Control Group | 1 |
6y2048 Control Gp-Winch
| 6Y***48 | Control Group-Winch | 1 |
5g3446 Cylinder Group-Slider Lock
| 5G***46 | Cylinder Group; Slider Lock Cylinder Group | 1 |
3g5767 Boom Cylinder Group
| 3G***67 | Cylinder Group-Backhoe Boom | 1 |
3g5905 Bucket Cylinder Group
| 3G***05 | Cylinder Group-Backhoe Bucket | 1 |
1u2655 Stabilizer Cylinder Group-R.H.
| 1U***55 | Cylinder Group-Backhoe Stabilizer; Cylinder Gp-Backhoe Stabilizer-R.H | 1 |
1u2656 Stabilizer Cylinder Group-L.H.
| 1U***56 | Cylinder Group-Backhoe Stabilizer; Cylinder Gp-Backhoe Stabilizer-L.H | 1 |
3g5771 Stick Cylinder Group
| 3G***71 | Cylinder Group-Backhoe Stick | 1 |
3g7365 Bucket Cylinder Group-2 Required
| 3G***65 | Cylinder Group-Bucket; Cylinder Gp-Multi-Purpose Bucket | 1 |
7j5893 Cylinder Gp-Lift-R.H.
| 7J***93 | Cylinder Group-Lift | 1 |
7j5894 Cylinder Gp-Lift-L.H.
| 7J***94 | Cylinder Group-Lift | 1 |
9t6705 Cylinder Gp-L.H. Lift
| 9T***05 | Cylinder Group-Lift-Lh; Cylinder Gp-L.H. Lift | 1 |
9t6704 Cylinder Gp-R.H. Lift
| 9T***04 | Cylinder Group-Lift-Rh; Cylinder Gp-R.H. Lift | 1 |
7j9920 Ripper Cylinder Gp
| 7J***20 | Cylinder Group-Ripper | 1 |
3g6792 Stabilizer Cylinder Group
| 3G***92 | Cylinder Group-Stabilizer; Stabilizer Cylinder Group | 1 |
4t0963 Tilt Cylinder Group-2 Required
| 4T***63 | Cylinder Group-Tilt | 1 |
5g4626 Hydraulic Ar-3 Valve-Replaced By 5g9405-Page 127.01
| 1U***24 | Valve Group-Bank 3; Valve Gp-Bank-3 Valve | 1 |
| 5G***83 | Control Group-Hydraulic Hand; Control Gp-Hydraulic Attachment | 1 |
| 5G***15 | Lines Group-Front; Front Lines Group | 1 |
5g4627 Hydraulic Arrangement-4 Valve
| 1U***26 | Valve Group-Bank 4; Valve Gp-Bank-4 Valve | 1 |
| 5G***43 | Lines Group-Rear Attachment; Lines Gp-Rear Attachment-Ripper | 1 |
| 5G***85 | Control Group-Hydraulic Hand; Control Gp-Hydraulic Attachment | 1 |
5g0548 Hydraulic Arrangement-3 Valve Rear Attachment
| 1U***25 | Valve Group-Bank 3; Valve Gp-Bank-3 Valve | 1 |
| 5G***33 | Control Group-Hydraulic Hand; Hydraulic Hand Control Group-Ripper | 1 |
| 5G***43 | Lines Group-Rear Attachment; Lines Gp-Rear Attachment-Ripper | 1 |
5g9405 Hydraulic Ar-3 Valve
| 1U***24 | Valve Group-Bank 3; Valve Gp-Bank-3 Valve | 1 |
| 5G***83 | Control Group-Hydraulic Hand; Control Gp-Hydraulic Attachment | 1 |
| 5G***50 | Mounting Group-Attachment; Mounting Gp-Attachment Lines | 1 |
5g9406 Hydraulic Ar-4 Valve
| 1U***26 | Valve Group-Bank 4; Valve Gp-Bank-4 Valve | 1 |
| 5G***43 | Lines Group-Rear Attachment; Lines Gp-Rear Attachment-Ripper | 1 |
| 5G***85 | Control Group-Hydraulic Hand; Control Gp-Hydraulic Attachment | 1 |
5g3529 Kickout & Positioner Gp-Bucket-Part 1 Of 2
| 5G***29 | Kickout & Positioner Group | 1 |
5g3529 Kickout & Positioner Gp-Bucket-Part 2 Of 2
| 5G***29 | Kickout & Positioner Group | 1 |
5g3529 Bucket Positioner & Kickout Gp-Part 1 Of 2
| 5G***29 | Kickout & Positioner Group | 1 |
5g3529 Bucket Positioner & Kickout Gp-Part 2 Of 2
| 5G***29 | Kickout & Positioner Group | 1 |
5g2612 Boom Cylinder Lines Group
| 5G***12 | Lines Group-Boom Cylinder; Boom Cylinder Lines Group | 1 |
5g3669 Boom Cylinder Lines Group
| 5G***69 | Lines Group-Boom Cylinder; Room Cylinder Lines Group | 1 |
5g2619 Bucket Cylinder Lines Group
| 5G***19 | Lines Group-Bucket Cylinder; Bucket Cylinder Lines Group | 1 |
5g3672 Bucket Cylinder Lines Group
| 5G***72 | Lines Group-Bucket Cylinder; Bucket Cylinder Lines Group | 1 |
5g9399 Lines Gp-Front Hydraulic
| 5G***99 | Lines Group-Front; Lines Gp-Front-Mp Bucket | 1 |
5g4615 Front Hydraulic Lines Group-Lift Cylinder
| 5G***15 | Lines Group-Front; Front Lines Group | 1 |
5g5925 Hydraulic Lines Group-1 Circuit
| 5G***25 | Lines Group-Hydraulic; Lines Gp-Hydraulic-1 Circuit | 1 |
5g1652 Lines Gp-Hydraulic-Multi-Purpose Bucket-Part 2 Of 2
| 5G***52 | Lines Group-Hydraulic; Hydraulic Lines Group | 1 |
5g1652 Lines Gp-Hydraulic-Multi-Purpose Bucket-Part 1 Of 2
| 5G***52 | Lines Group-Hydraulic; Hydraulic Lines Group | 1 |
5g1652 Lines Gp-Hydraulic-Multi-Purpose Bucket
| 5G***52 | Lines Group-Hydraulic; Hydraulic Lines Group | 1 |
5g0408 Lift Cylinder Lines Group
| 5G***08 | Lines Group-Lift Cylinder | 1 |
5g0443 Pump Lines Group
| 5G***43 | Lines Group-Pump | 1 |
5g0543 Rear Attachment Lines Group
| 5G***43 | Lines Group-Rear Attachment; Lines Gp-Rear Attachment-Ripper | 1 |
6s3559 Ripper Lines Group
| 6S***59 | Lines Group-Ripper; Ripper Lines Group | 1 |
5g2216 Stablizer Lines Group
| 5G***16 | Lines Group-Stabilizer; Stabilizer Lines Group | 1 |
5g3682 Stabilizer Lines Group
| 5G***82 | Lines Group-Stabilizer; Lines Group-Stabilizer Cylinder | 1 |
5g2618 Stick Cylinder Lines Group
| 5G***18 | Lines Group-Stick; Stick Cylinder Lines Group | 1 |
5g3675 Stick Cylinder Lines Group
| 5G***75 | Lines Group-Stick; Stick Cylinder Lines Group | 1 |
5g3679 Swing Actuator Lines Group
| 5G***79 | Lines Group-Swing Actuator; Swing Actuator Lines Group | 1 |
5g2606 Swing Actuator Lines Group
| 5G***06 | Lines Group-Swing Actuator; Swing Actuator Lines Group | 1 |
5g0407 Tilt Cylinder Lines Group
| 5G***07 | Lines Group-Tilt Cylinder | 1 |
7g9425 Winch Lines Group
| 7G***25 | Lines Group-Winch; Winch Lines Group | 1 |
6y2111 Lines Gp-Winch
| 6Y***11 | Lines Group-Winch | 1 |
5g2491 Hydraulic Control Lock Gp
| 5G***91 | Lock Group-Hydraulic Hand Control | 1 |
7g6800 Manifold Group-Filter Base & Pressure Control
| 7G***00 | Manifold Group | 1 |
5g8750 Mounting Gp-Attachment-Front Lines
| 5G***50 | Mounting Group-Attachment; Mounting Gp-Attachment Lines | 1 |
5g4580 Pump And Lines Group-Backhoe
| 5G***80 | Pump & Lines Group; Pump & Lines Gp-Backhoe | 1 |
8y1299 Pump & Lines Gp
| 5G***80 | Pump & Lines Group; Pump & Lines Gp-Backhoe | 1 |
| 8Y***34 | Tube As | 2 |
| 8Y***99 | Pump & Lines Group | 1 |
5g3774 Pump & Lines Gp
| 5G***74 | Pump & Lines Group | 1 |
3g5386 Gear Pump Group-Shimadzu Seisakusko
| 3G***86 | Pump Group-Gear; Gear Pump Group-Shimadzu Seisakusho | 1 |
8j4515 Gear Pump Group-Tyrone
| 8J***15 | Pump Group-Gear; Gear Pump Group-Tyrone | 1 |
1u0414 Gear Pump Group
| 1U***14 | Pump Group-Gear | 1 |
8j4514 Hydraulic Gear Pump Group
| 8J***14 | Pump Group-Gear | 1 |
4t0384 Piston Pump Group-Slipper
| 4T***84 | Pump Group-Piston | 1 |
3y6893 Shaft Group
| 3Y***93 | Shaft Group | 1 |
5g0099 Hydraulic Tank And Filter Group
| 5G***99 | Tank & Filter Group | 1 |
5g0013 Hydraulic Tank Group
| 5G***13 | Tank Group-Hydraulic | 1 |
5g3687 Lines And Valve Group
| 5G***87 | Valve & Lines Group; Lines And Valves Group | 1 |
5g2582 Lines And Valve Group
| 5G***82 | Valve & Lines Group; Valve And Lines Group | 1 |
5g3692 Sideshift Lock Lines And Valve Group
| 5G***92 | Valve & Lines Group; Lines And Valve Group--Sideshift Lock | 1 |
3g0777 Control Valve Group-Boom
| 3G***77 | Valve Group | 1 |
7g6861 Valve Gp
| 7G***61 | Valve Group | 1 |
1u2576 Bank Valve Group
| 1U***76 | Valve Group-Bank | 1 |
1u1023 Bank Valve Group-2 Valve
| 1U***23 | Valve Group-Bank 2 | 1 |
1u1024 Bank Valve Group-Lift, Tilt & Multi-Purpose
| 1U***24 | Valve Group-Bank 3; Valve Gp-Bank-3 Valve | 1 |
1u1025 Bank Valve Group-Lift, Tilt, & Ripper
| 1U***25 | Valve Group-Bank 3; Valve Gp-Bank-3 Valve | 1 |
1u1026 Bank Valve Group-Lift, Tilt, Multi-Purpose-Bucket & Ripper
| 1U***26 | Valve Group-Bank 4; Valve Gp-Bank-4 Valve | 1 |
6s4767 Breaker Relief Valve Group
| 6S***67 | Valve Group-Breaker Relief | 1 |
8j9471 Lift Cylinder Make-Up Valve Group
| 8J***71 | Valve Group-Check; -Lift Cylinder Circuit | 1 |
3g0778 Control Valve Group-Bucket & Stabilizers
| 3G***78 | Valve Group-Control; (Rh Stabilizer) | 1 |
6s9822 Control Valve Group
| 6S***22 | Valve Group-Control | 1 |
5g0334 Control Valve Group-Bucket
| 5G***34 | Valve Group-Control | 1 |
1u4630 Control Valve Group-Swing
| 1U***30 | Valve Group-Control | 1 |
9j0717 Control Valve Group-Ripper
| 9J***17 | Valve Group-Control | 1 |
3g2887 Diverter Valve Group
| 3G***87 | Valve Group-Diverter; -Towing, Parking Brake Release | 1 |
9j0715 Lift Cylinder Control Valve Group
| 9J***15 | Valve Group-Lift Control | 1 |
4t2591 Relief Valve Group-Pilot Operated
| 4T***91 | Valve Group-Relief; (Pressure) | 1 |
9j0723 Pilot Operated Relief Valve Group-Main
| 9J***23 | Valve Group-Relief | 1 |
9j0797 Pilot Operated Relief Valve Group
| 9J***97 | Valve Group-Relief; (Pilot Operated) | 1 |
8j9469 Tilt Cylinder Relief Valve Group-Pilot Operated-Dump
| 8J***69 | Valve Group-Relief | 1 |
9j0710 Relief Valve Group-Direct Operated-Ripper Cylinder
| 9J***10 | Valve Group-Relief | 1 |
8j9475 Relief Valve Group-Direct Operated
| 8J***75 | Valve Group-Relief | 1 |
9j0798 Relief Valve Group-Backhoe-Pilot Operated
| 9J***98 | Valve Group-Relief | 1 |
7g6799 Selector And Pressure Control Valve Group
| 7G***99 | Valve Group-Selector & Press Cont | 1 |
9t1076 Servo Valve Group
| 9T***76 | Valve Group-Servo | 1 |
9j0719 Tilt Control Valve Group
| 9J***19 | Valve Group-Tilt Control | 1 |
Implements
5g2150 Fixed Pivot Backhoe Arrangement
| 1U***55 | Cylinder Group-Backhoe Stabilizer; Cylinder Gp-Backhoe Stabilizer-R.H | 1 |
| 1U***56 | Cylinder Group-Backhoe Stabilizer; Cylinder Gp-Backhoe Stabilizer-L.H | 1 |
| 3G***67 | Cylinder Group-Backhoe Boom | 1 |
5g3690 Sideshift Backhoe Arrangement
| 3G***67 | Cylinder Group-Backhoe Boom | 1 |
| 3G***71 | Cylinder Group-Backhoe Stick | 1 |
| 3G***05 | Cylinder Group-Backhoe Bucket | 1 |
4t0807 Bit And Cutting Edge Group
| 4T***07 | Bit & Cutting Edge Group | 1 |
4t0805 Bit And Cutting Edge Group
| 4T***05 | Bit & Cutting Edge Group | 1 |
5g2721 Boom Group
| 5G***21 | Boom Group; Boom Group | 1 |
5g1679 Multi-Purpose Bucket Arrangement
| 3G***65 | Cylinder Group-Bucket; Cylinder Gp-Multi-Purpose Bucket | 2 |
| 5G***52 | Lines Group-Hydraulic; Hydraulic Lines Group | 1 |
| 5G***79 | Bucket Ar-Multipurpose | 1 |
5g2811 General Purpose Bucket Assembly
| 5G***11 | Bucket As-General Purpose | 1 |
5g3475 General Purpose Bucket Assembly
| 5G***75 | Bucket As-General Purpose | 1 |
5g0887 Hoe Bucket Group-457.2 Mm (18 In.) Wide
| 5G***87 | Bucket Group-Hoe | 1 |
5g0885 Hoe Bucket Group-690.6 Mm (24 In.) Wide
| 5G***85 | Bucket Group-Hoe | 1 |
5g0888 Hoe Bucket Group-762 Mm (30 In.) Wide
| 5G***88 | Bucket Group-Hoe | 1 |
5g0886 Hoe Bucket Group-914.4 Mm (36 In.) Wide
| 5G***86 | Bucket Group-Hoe | 1 |
5g4091 Multi-Purpose Bucket Group
| 5G***91 | Bucket Group-Multipurpose; Multi-Purpose Bucket Group | 1 |
6y1467 Case & Covers Gp
| 6Y***67 | Case & Covers Group-Winch | 1 |
7g9424 Covers And Case Group
| 7G***24 | Case & Covers Group-Winch | 1 |
6y1907 Gear & Clutch Gp-Part 1 Of 2
| 6Y***07 | Clutch & Gear Group; Gear & Clutch Gp | 1 |
6y1907 Gear & Clutch Gp-Part 2 Of 2
| 6Y***07 | Clutch & Gear Group; Gear & Clutch Gp | 1 |
7t5187 Gear & Clutch Gp-Part 2 Of 2
| 7T***87 | Clutch & Gear Group | 1 |
7t5187 Gear & Clutch Gp-Part 1 Of 2
| 7T***87 | Clutch & Gear Group | 1 |
5g2543 Console Group
| 5G***43 | Console Group; Backhoe Console Group | 1 |
5g3594 Backhoe Console Group
| 5G***94 | Console Group-Backhoe; Console Group-Backhoe | 1 |
5g2586 Mounting And Control Group
| 5G***86 | Control & Mounting Group; Backhoe Mounting & Control Group | 1 |
5g3960 Bucket Control Group
| 5G***60 | Control Group-Bucket | 1 |
5g2636 Control Gp-Towing Winch
| 5G***36 | Control Group-Winch; Control Gp-Towing Winch | 1 |
6y2216 Control Gp-Winch
| 6Y***16 | Control Group-Winch | 1 |
5g3938 Control Gp-Towing Winch
| 5G***38 | Control Group-Winch; Control Gp-Towing Winch | 1 |
6t2291 Control Gp-Winch Hydraulic
| 6T***91 | Control Group-Winch Hydraulic | 1 |
3t9837 Conversion Ar-Winch-Directional
| 3T***37 | Conversion Ar-Winch | 1 |
6y2176 Conversion Ar-Winch
| 0S***19 | Bolt,Machine Gear Retaining Part Of Kit P/N 1w***46 | 5 |
| 1A***83 | Bolt (4.75" Long-Location "B") | 2 |
| 3T***80 | Cover As | 1 |
7t3874 Conversion Ar-Winch
| 7T***74 | Conversion Ar-Winch | 1 |
9g0921 Winch Conversion Arrangement-Power Out
| 9G***21 | Conversion Group-Winch | 1 |
6y2217 Conversion Gp-Winch
| 6Y***17 | Conversion Group-Winch | 1 |
7g9547 Conversion Gp-Winch-Anti-Fallback
| 7G***47 | Conversion Group-Winch | 1 |
6y1959 Conversion Gp-Winch
| 6Y***59 | Conversion Group-Winch | 1 |
7g9447 Covers Gp-Shipping
| 2M***80 | Seal--To Connector Pump Outlet | 1 |
| 3T***85 | Cover-Shipping; Shipping Cover | 1 |
| 7G***47 | Cover Group-Shipping; Shipping Cover Group | 1 |
7g9470 Drive Gp-Winch
| 7G***70 | Drive Group-Winch | 1 |
5g3260 Backhoe Frame Group
| 5G***60 | Frame Group; Frame Group-Backhoe | 1 |
5g2235 Backhoe Frame Group
| 5G***35 | Frame Group; Backhoe Frame Group | 1 |
5g3443 Sliding Frame Group
| 5G***43 | Frame Group-Sliding; Sliding Frame Group | 1 |
5g2465 Swing Frame Group
| 5G***65 | Frame Group-Swing; Swing Frame Group | 1 |
5g3535 Bucket Indicator Group
| 5G***35 | Indicator Group-Bucket | 1 |
5g2695 Bucket Linkage Group
| 5G***95 | Linkage Group-Bucket; Bucket Linkage Group | 1 |
6t2288 Manifold Gp-Filter Base & Pressure Control
| 6T***88 | Manifold Group | 1 |
5g2173 Backhoe Mounting Arrangement
| 5G***73 | Mounting Ar-Backhoe | 1 |
| 5G***34 | Seat Group; Reversible Seat Group | 1 |
| 5G***41 | Gauge Group-Hydraulic Oil Temp; Hydraulic Oil Temperature Gauge Group | 1 |
6s6371 Backhoe Mounting Group
| 6S***71 | Mounting Group-Backhoe; Backhoe Mounting Group | 1 |
6s5905 Cylinder Mounting Group
| 6S***05 | Mounting Group-Cylinder; Cylinder Mounting Group | 1 |
8j3294 Ripper Mounting Group
| 8J***94 | Mounting Group-Ripper; Ripper Mounting Group | 1 |
7g9423 Mounting Gp-Winch
| 7G***23 | Mounting Group-Winch | 1 |
5g4320 Street Pad Group
| 5G***20 | Pad Group-Street | 1 |
6s7799 Street Pad Group
| 6S***99 | Pad Group-Street | 1 |
8j0631 Ripper Ar
| 6S***59 | Lines Group-Ripper; Ripper Lines Group | 1 |
| 7B***28 | Drive Screws-2 Required For Installing | 2 |
| 7J***20 | Cylinder Group-Ripper | 1 |
8j3334 Ripper Group
| 8J***34 | Ripper Group; Ripper Group | 1 |
5g2979 Stablizer Group-2 Required
| 5G***79 | Stabilizer Group; Stabilizer Group | 1 |
5g2963 Step Group
| 5G***63 | Step Group; Step Group | 1 |
5g2717 Hoe Stick Group
| 5G***17 | Stick Group-Hoe; Backhoe Stick Group | 1 |
8j5313 Tooth Group
| 8J***13 | Tooth Group | 1 |
1u1530 Tooth Gp
| 1U***30 | Tooth Group | 1 |
1u1529 Tooth Group-Short
| 1U***29 | Tooth Group | 1 |
9j4208 Tooth Group
| 9J***08 | Tooth Group | 1 |
9j0613 Loader Tooth Group-Uni
| 9J***13 | Tooth Group-Loader | 1 |
1u1528 Tooth Group-Long
| 1U***28 | Tooth Group-Long | 1 |
1u1527 Tooth Group-Short
| 1U***27 | Tooth Group-Short | 1 |
1u2423 Uni-Tooth Group
| 1U***23 | Tooth Group-Uni | 1 |
1u2422 Uni-Tooth Group
| 1U***22 | Tooth Group-Uni | 1 |
6t2289 Valve Gp
| 6T***89 | Valve Group | 1 |
6t2287 Valve Gp-Selector & Pressure Control
| 6T***87 | Valve Group-Selector & Press Cont | 1 |
7t5189 Winch Ar
| 5G***36 | Control Group-Winch; Control Gp-Towing Winch | 1 |
| 5G***74 | Pump & Lines Group | 1 |
| 7G***23 | Mounting Group-Winch | 1 |
6y2219 Winch Ar
| 5G***36 | Control Group-Winch; Control Gp-Towing Winch | 1 |
| 5G***74 | Pump & Lines Group | 1 |
| 6Y***56 | Winch Ar-Towing | 1 |
6y2056 Winch Ar-Towing
| 4B***58 | Screw (Identification Plate) Mounting | 4 |
| 6V***27 | Plate, Serial Number; On Left Hand Side Of Winch | 1 |
| 6V***46 | Film-Cat-Each Side | 1 |
7t5188 Towing Winch Arrangement
| 4B***58 | Screw (Identification Plate) Mounting | 4 |
| 6V***27 | Plate, Serial Number; On Left Hand Side Of Winch | 1 |
| 7G***98 | Control Group-Winch; Winch Hydraulic Control Group | 1 |
Lubrication System
6n3382 Breather Group
| 6N***82 | Breather Group; Breather Group | 1 |
1n3224 Oil Filter Group
| 1N***24 | Filter Group-Oil; Oil Filter Group | 1 |
7w0297 Fumes Disposal Group
| 7W***97 | Fumes Disposal Group; Fumes Disposal Group | 1 |
1w0367 Oil Level Gauge Group
| 1W***67 | Gauge Group-Oil Level (Dipstick) | 1 |
2w6697 Oil Pump Group-Without Housing
| 2W***97 | Pump Group-Oil-Without Housing | 1 |
Power Train-Power Transmission Unit
6t3921 Transmission Brake Group
| 6T***21 | Brake Group-Transmission; Transmission Brake Group | 1 |
6t3923 Transmission Case And Covers Group
| 6T***23 | Case & Parts Group-Planetary; Transmission Case And Covers Group | 1 |
7t6174 Flywheel Clutch Group
| 7T***74 | Clutch Group-Flywheel | 1 |
5g4694 Clutch Control Group
| 5G***94 | Control Group-Clutch | 1 |
5g4883 Forward And Reverse Control Group
| 5G***83 | Control Group-Forward/Reverse | 1 |
5g5911 Power Take-Off Drive Group
| 5G***11 | Drive Group-Power Take-Off | 1 |
5g5292 Power Train Oil Filler Group
| 5G***92 | Filler Group-Power Train Oil | 1 |
9p1509 Transmission Filter Group-With Housing
| 9P***09 | Filter Group-Transmission; (Trans.) | 1 |
6s7402 Final Drive Gp-Part 1 Of 2
| 6S***02 | Final Drive Group | 1 |
6s7402 Final Drive Gp-Part 2 Of 2
| 6S***02 | Final Drive Group | 1 |
6s3604 Final Drive Gp-Part 1 Of 2
| 6S***04 | Final Drive Group | 1 |
6s3604 Final Drive Gp-Part 2 Of 2
| 6S***04 | Final Drive Group | 1 |
5g4719 Bevel Gear Group
| 5G***19 | Gear Group-Bevel | 1 |
6t3922 Transmission Gear Group-Part 2 Of 2
| 6T***22 | Gear Group-Transmission | 1 |
6t3922 Transmission Gear Group-Part 1 Of 2
| 6T***22 | Gear Group-Transmission | 1 |
5g4666 Power Train Oil Lines Group
| 5G***66 | Lines Group-Power Train Oil | 1 |
6t4410 Transmission Gear Pump Group-2 Section
| 6T***10 | Pump Group-Transmission; Pump Gp-Transmission Gear | 1 |
6t4411 Transmission Gear Pump Group-2 Section
| 6T***11 | Pump Group-Transmission | 1 |
6t3919 Shift Gp-Gear-Part 2 Of 2
| 6T***19 | Shift Group-Gear | 1 |
6t3919 Shift Gp-Gear-Part 1 Of 2
| 6T***19 | Shift Group-Gear | 1 |
6t3924 Transmission Ar-Direct Drive
| 6T***19 | Shift Group-Gear | 1 |
| 6T***21 | Brake Group-Transmission; Transmission Brake Group | 1 |
| 6T***22 | Gear Group-Transmission | 1 |
5g1823 Universal Joint Group
| 5G***23 | Universal Joint Group | 1 |
7t0706 Valve Group
| 7T***06 | Valve Group | 1 |
6t9284 Valve Group-Selector & Pressure Control
| 6T***84 | Valve Group-Selector & Press Cont | 1 |
Service Equipment And Supplies
Gasket Kits
| 6V***96 | Rebuild Kit (Water Pump) | 0 |
| 8T***76 | Rear Structure | 0 |
| 8T***30 | Multiple Cylinder Head | 0 |
8f9866 Grease Gun Assembly
| 8F***66 | Grease Gun As | 1 |
3p2244 Hand Tool Group
| 3P***44 | Hand Tool Group | 1 |
Name Plates And Transfers
| 03***91 | Pop - Rivet (To Secure Safety Lable) | 4 |
| 2P***31 | Film--Cat On Each Side Of Radiator Guard; Film--Cat On Each Side--Above Drum Shaft | 2 |
| 2P***44 | Film-Caterpillar; On Front Of Radiator Guard | 1 |
Starting And Electrical System
7n4784 Alternator Group-12 Volt, 40 Ampere
| 7N***84 | Alternator Group-Charging | 1 |
8n2822 Alternator Group-12 Volt, 75 Ampere
| 8N***68 | Alternator Group-Charging | 1 |
| 8N***22 | Alternator Group-Charging | 1 |
| 9S***73 | Circuit Breaker (60 Amps); Circuit Breaker-60 Ampere | 1 |
1w4263 Alternator Group
| 1W***63 | Alternator Group-Charging | 1 |
8n2268 Alternator Group-12 Volt, 75 Ampere
| 8N***68 | Alternator Group-Charging | 1 |
5g0237 Battery And Wiring Group-Part 2 Of 3
| 5G***37 | Battery & Wiring Group | 1 |
5g0237 Battery And Wiring Group-Part 3 Of 3
| 5G***37 | Battery & Wiring Group | 1 |
5g0237 Battery And Wiring Group-Part 1 Of 3
| 5G***37 | Battery & Wiring Group | 1 |
6s3548 Battery Group-Heavy Duty
| 6S***48 | Battery Group | 1 |
5g1812 Electric Horn Group
| 5G***12 | Horn Group-Electric | 1 |
5g1715 Lighting Group-3 Lamp-12 Volt
| 5G***15 | Lighting Group | 1 |
5g2541 Ether Starting Aid Group
| 5G***41 | Starting Aid Group-Ether | 1 |
4n0241 Electric Starting Motor Group
| 4N***41 | Starting Motor Group-Electric | 1 |
4n0190 Electric Starting Motor Group-12 Volt
| 4N***90 | Starting Motor Group-Electric; Electric Starting Motor Group | 1 |
9g5517 Switch Assembly-12 Volt
| 9G***17 | Switch As | 1 |
8n0410 Solenoid Group
| 8N***10 | Switch Group; (Magnetic) | 1 |
5g5898 Backup Warning Group
| 5G***98 | Warning Group-Backup | 1 |
Steering Clutches And Brakes
5g8740 Brake Gp-Steering-Part 3 Of 3
| 5G***40 | Brake Group-Steering | 1 |
5g8740 Brake Gp-Steering-Part 2 Of 3
| 5G***40 | Brake Group-Steering | 1 |
5g5890 Steering Brake Gp-Part 3 Of 3
| 5G***90 | Brake Group-Steering | 1 |
5g8740 Brake Gp-Steering-Part 1 Of 3
| 5G***40 | Brake Group-Steering | 1 |
5g5890 Steering Brake Gp-Part 2 Of 3
| 5G***90 | Brake Group-Steering | 1 |
5g5890 Steering Brake Gp-Part 1 Of 3
| 5G***90 | Brake Group-Steering | 1 |
5g5891 Steering Clutch Case Group
| 5G***91 | Case Group-Steering Clutch | 1 |
5g8741 Case Gp-Steering Clutch
| 5G***41 | Case Group-Steering Clutch; Case Gp-Steering-Clutch | 1 |
5g8725 Clutch Gp-Steering
| 5G***25 | Clutch Group-Steering; Clutch Gp-Steering Brake | 1 |
6s3528 Steering Clutch Group
| 6S***28 | Clutch Group-Steering | 1 |
5g4699 Control Gp-Steering Clutch-Part 1 Of 2
| 5G***99 | Control Group-Steering Clutch | 1 |
5g4699 Control Gp-Steering Clutch-Part 2 Of 2
| 5G***99 | Control Group-Steering Clutch | 1 |
5g4699 Steering Clutch Control Group-Part 2 Of 2
| 5G***99 | Control Group-Steering Clutch | 1 |
5g4699 Steering Clutch Control Group-Part 1 Of 2
| 5G***99 | Control Group-Steering Clutch | 1 |
5g1073 Brake Band Lining Assembly*R
| 5G***73 | Lining & Band As | 1 |
5g6114 Steering Ar-Clutch & Brake Oil
| 1A***57 | Ball-Steering Clutch Release Yoke | 1 |
| 1M***23 | Insert-Steering Clutch Release Yoke | 1 |
| 5G***14 | Steering Ar-Oil Clutch & Brake | 1 |
5g8121 Valve Gp-Control
| 5G***21 | Valve Group; (Right Steer. | 1 |
5g8120 Valve Gp-Control
| 5G***20 | Valve Group; (Lh Control) | 1 |
5g0145 Control Valve Group
| 5G***45 | Valve Group-Control | 1 |
5g0706 Valve Gp-Control
| 5G***06 | Valve Group-Control | 1 |
D3 serial number reference
On the original small D3 (1973-1979), the serial/PIN plate is stamped into the bevel gear case at the rear of the tractor, with a reference plate also commonly found in the operator's compartment near the firewall. Exact side placement varies by unit, so confirm the exact spot against the physical machine or with a dealer. Read the first three characters as the prefix (model and build source) and the digits that follow as the sequential unit number.
| Prefix | Identifies | Notes |
|---|---|---|
| 79U | D3 (1973-1979, standard-gauge track-type tractor) | Main-volume prefix for the original small D3 crawler tractor, built in Japan. Powered by the Cat 3204 four-cylinder diesel rated 62 hp (46 kW). Sequence ran from 1 up through roughly the low 6000s. Most references place the model run at 1973-1979; at least one independent source instead cites a 1972 start, so treat the earliest year as approximate. A documented unit at 79U4521 was built August 1977. |
| 83U | D3 LGP (1973-1979, low ground pressure / extreme-service undercarriage) | LGP-undercarriage version of the original small D3, same 3204 engine and Japan build as 79U. Active from around 1975 with an extreme-service undercarriage. Documented sequence tops out at roughly 800. Exact year breaks are not documented in available sources - confirm with dealer. |
| 06N | D3 (1973-1979, limited early-production run) | Appears alongside 79U/82U/83U across the same factory operator's and service manual family for the original small D3 crawler (shown in some literature as "6N"). Sequence only reaches the high 800s, pointing to a small or early batch. Exact track gauge/undercarriage not documented in available sources - confirm with dealer. |
| 82U | D3 (1973-1979, configuration undocumented) | Listed with 79U/83U/06N in the same Cat manual family for the original small D3 crawler, but no source specifies which undercarriage or gauge this run covers. Single-source for configuration - confirm with dealer. |
Frequently asked questions
What engine does the Caterpillar D3 (1973-1979) have?
It uses the Caterpillar 3204, a naturally aspirated four-cylinder diesel with mechanical governor-controlled fuel injection, producing approximately 46 kW (62 hp).
What is the operating weight of this D3?
Operating weight runs roughly 4.7 to 6 tonnes (about 10,300 to 13,000-plus lb), varying by configuration: standard gauge, LGP wide-track, or tractor-loader-backhoe.
What replaced the Caterpillar D3 of this era?
It was replaced by the Caterpillar D3B at the end of the 1970s, continuing the same small track-type tractor class.
What D3 owners discuss
Why is the vintage D3's Cat 3204 hard to start cold, and what do owners actually do about it?
Hard starting on this engine gets traced most often to weak injectors: it struggles to fire on its own but catches instantly with a shot of starting fluid, which points at the injectors rather than the pump. Fuel delivery should be checked too; transfer pump pressure at high idle should read roughly 200-275 kPa (30-40 psi), and low or no reading means a lift pump, air leak, or plugged fuel screen upstream of the injectors. If the engine still won't build compression, a leakdown test tells more than a straight compression gauge on a motor this old. A trick repeated by owners in cold climates is adding a small dose of automatic transmission fluid to a mostly-full fuel tank, said to noticeably improve cold starts. A block heater plugged in overnight helps more consistently. Starting-aid hardware varies by individual machine: some of these engines used a precombustion-chamber design with intake air heating, others (later in the production run) got a direct-injection version paired with an ether-assist canister. Confirm which system is fitted before using starting fluid: introducing ether to an engine with a hot glow plug or heater still active can cause a dangerous intake backfire. Have a qualified mechanic verify which starting-aid system your machine has before troubleshooting further.
What do mechanics say about the mechanical governor and injection pump on the 3204?
The engine uses a hydra-mechanical governor: engine-driven flyweights and a spring work against a hydraulic valve and piston that positions the fuel rack inside the injection pump housing. Community consensus is blunt: leave the factory-set adjusting screws alone unless you're prepared to redo the full procedure, since disturbing them means resetting fuel setting, high and low idle speed, and pump timing from scratch, referenced off number one piston at top center on the compression stroke. Rough running or a cylinder that skips is more often diagnosed as a weak or dirty injector, or occasionally a leaking head gasket between cylinders (not uncommon on this engine), than a governor fault. Injectors get pulled and bench-tested at a fuel injection shop rather than guessed at in the field. Because a misadjusted governor or pump affects engine speed control, have a qualified mechanic or dealer verify any governor or injection timing work before returning the machine to service.
What powershift transmission failures come up repeatedly on these dozers?
Track slip at low idle is a known trait, attributed to hydraulic clutch pressure that isn't quite enough to fully lock the clutches until rpm comes up. A separate complaint is a transmission that clicks cleanly into reverse, neutral, first, and second, but won't select third, pointing at a sticking valve or worn linkage rather than the clutch packs themselves. More serious is transmission pump failure, which shows up as hard pedals, loss of steering assist, and the machine stalling out once it reaches operating temperature; this is treated as a hydraulic supply problem, not an engine issue. Owners describe this size of machine as a natural condensate maker with leak-prone covers, and standing water in the transmission case is blamed for delaminating clutch friction material over time, first noticed as thumbnail-size flakes plugging the suction filter screen. A full teardown can also turn up unrelated metal debris on the magnetic suction screen (bearing rollers, washer fragments), a sign of earlier internal damage that wasn't fully cleaned out. Because loss of steering hydraulics is a safety issue, have a qualified mechanic or dealer verify transmission and steering pump condition before operating a machine with any of these symptoms.
How does the dry clutch-and-brake steering behave, and what wears out first?
Steering clutches on this machine spring-engage and release hydraulically: a release cylinder pushes a yoke against the spring housing to disengage drive to that track. Braking is a simple manual rod-and-band setup, and the only adjustment is band tightness. A commonly repeated field procedure is to tighten the brake as far as it will go, back it off about one and a half turns, then set the linkage rods as short as possible while still allowing the pins to seat. A frequently cited high-failure item is the roller bearing on the end of the steering control valve spool; if a clutch isn't fully releasing before its brake grabs, that roller is the first place to look. Being a dry clutch-and-brake design from this era (later D3 variants moved to different steering hardware), the bands and linkage need periodic manual readjustment rather than self-adjusting over time. Because steering directly affects operator control, have a qualified mechanic or dealer verify clutch and brake adjustment before returning the machine to work.
What undercarriage wear pattern is typical for a small crawler tractor this age?
The D3 line was offered with either an abrasion-resistant chain or a sealed-and-lubricated (SALT) chain, and owners report the two behave differently as they age. SALT chain seals lubricant into the pin and bushing joints to keep grit out, and typical reported service life runs roughly 3,700 to 4,000 hours before pins and bushings need attention, with rail wear limits cited around 126 mm new down to about 115 mm (4.96 in to 4.53 in) fully worn; actual figures vary by chain type and application. When SALT seals fail, lubricant leaks out unnoticed and the joint starts running dry, which shows up as a squeak or howl similar to a non-sealed chain under load. Opinions differ on whether it's worth turning pins and bushings on a machine this size: several experienced rebuilders argue the rail itself typically wears out before a turned pin-and-bushing joint would fail again, making straight rail replacement the more practical call once wear limits are reached.
What should owners know about the factory backhoe and loader attachments shared with the Cat 931?
The D3's backhoe attachment shares its design lineage with the contemporaneous 931 track loader: a fixed-pivot, side-shift backhoe using a rack-and-pinion swing mechanism. The 931's own hydraulic pump can run its backhoe, but the D3 needs the optional higher-capacity pump, rated around 83 L/min (22 gpm) at 17 000 kPa (2500 psi), to power the same attachment properly; the backhoe connects to machine hydraulics through a power-beyond adapter on the implement valve for live power. Because chassis and hydraulic architecture are shared across the D3 and 931 family, backhoe and loader components sourced from either machine are often reported to interchange, but pump capacity and plumbing need to be checked case by case, since an undersized pump noticeably slows cylinder response under digging load.
What should a buyer check before purchasing a used vintage D3 today?
Aftermarket support for engine, undercarriage, and hydraulic cylinder components is generally described as good, since these parts overlap with later D3B and D3C production. Factory items unique to the earliest machines, notably the transmission control valve and some pump housings, are described by owners as very difficult to source new, so budget for rebuild or exchange units rather than new stock. On inspection: pull a fuel sample and check transfer pump pressure, have the injectors bench-tested rather than judged by ear, and run a leakdown test rather than relying on compression alone (normal compression ratio on the non-turbo engine runs around 17:1). Expect dry, manually-adjusted steering clutches and brakes on a machine this old, not self-adjusting hardware. Check the transmission for water-contaminated, delaminating clutch material, a known issue on this size of machine, and pull the magnetic suction screen to check for metal fines indicating prior internal damage. Confirm which undercarriage type is fitted (abrasion-resistant or sealed-and-lubricated chain), since remaining rail life and turn-versus-replace economics differ between the two. Given the machine's age, budget for a full engine and transmission going-through rather than expecting drive-away condition, and have a qualified mechanic or dealer verify overall mechanical and structural condition before completing a purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Serial-range & configuration variants
This page covers the Caterpillar D3. Related factory variants of the same model family:
D3
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