Caterpillar D8N
Maintenance schedule, common problems & OEM parts breakdown
The D8N is a mid-large Caterpillar track-type tractor in the D8 size class, built from 1987 through 1996. It runs the Cat 3406 turbocharged, aftercooled inline-six diesel: early production used the mechanical 3406 and 3406B, later builds moved to the electronically-assisted 3406C, rated around 228 kW (306 hp) gross and 213 kW (285 hp) net at 2100 rpm. Bare shipping weight runs roughly 26,400 kg (58,300 lb); operating weight with a standard S-blade and full fluids lands near 37,500 kg (82,600 lb), and a dozer-plus-ripper configuration runs closer to 36,000 kg (79,400 lb) - the exact figure varies by blade, ripper, and undercarriage choice. It followed the larger, more powerful D8L (1982-1987) and was replaced by the D8R starting in 1996. Factory configurations included straight (S) and semi-U (SU) dozer blades with PAT hydraulic control, single- or multi-shank rippers, a waste-disposal application package, and a choice of rigid or bogie-suspended undercarriage.
The D8N's signature change was differential steering, the first time Caterpillar built that system into a track-type tractor, replacing the clutch-and-brake steering used on the D8L and earlier D8s; it carried differential steer forward into the D8R and D8T that followed. Within the D8N run itself, the biggest split is undercarriage: some serial groups carry a bogie-suspended (oscillating) track frame while a separate rigid-frame group was built alongside them, so undercarriage parts should be matched by serial prefix rather than by year alone. Engine control moved from purely mechanical fuel systems early in the run to the electronically-assisted 3406C later, though core service capacities stayed the same across that change. In the used and parts market the D8N holds up well: it predates emissions aftertreatment entirely, its 3406-family engine and TO-4 drivetrain fluids are common across a wide range of Cat iron, and used units and take-off parts remain plentiful compared to the tighter-supply D8R and D8T that followed it.
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 D8N specifications
Engine
| Engine model | Cat 3406, inline-6 diesel. Early production tractors (from 1987 launch) used the mechanical 3406B; later production years used the electronically-assisted 3406C. Spec sheets most commonly cite the 3406C rating. |
| Aspiration | Turbocharged and aftercooled |
| Displacement | 14.6 L (891 cu in) |
| Gross power | 228 kW (306 hp) at 2100 rpm |
| Net power | 213 kW (285 hp) at 2100 rpm |
| Emissions | Pre-emissions-regulation mechanical/PEEC diesel; no EPA Tier certification applies to this production era |
| Cylinders | 6 |
Weights
| Shipping weight (bare tractor) | 26,427 kg (58,261 lb) |
| Operating weight, dozer + ripper configuration | 36,007 kg (79,381 lb) |
| Operating weight, standard S-blade configuration | 37,462 kg (82,590 lb) — figure most widely published for the standard dozer configuration; exact figure varies by blade type, ripper, and other attachments |
| Note | A dedicated factory LGP (Low Ground Pressure) trim is not clearly documented for the D8N in available spec sheets, unlike later D8T/D8R generations. Weight varies with track shoe width and attachment package |
Dimensions
| Overall length with S-blade | 6.27 m (20 ft 6-7 in) |
| Length without blade | 4.95 m (16 ft 3 in) |
| Overall width over tracks | 2.65-2.66 m (8 ft 8-9 in) |
| Height to top of cab | 3.43-3.44 m (11 ft 3 in) |
| Ground clearance | 0.55 m (1 ft 9-10 in) |
| Track gauge (centerline to centerline) | 2.08-2.10 m (6 ft 10 in) |
| Standard track shoe width | 560 mm (22 in); wider shoes available for softer ground conditions |
| Ground contact length | 3.20 m (126 in) |
| Ground contact area | approx. 3.6 sq m (5,580 sq in) per track pair, standard shoe |
Performance
| Travel speed, forward (top gear) | 10.8-10.9 km/h (6.8 mph) |
| Travel speed, reverse (top gear) | 13.9-14.0 km/h (8.7 mph) |
| Number of speeds | 3 forward, 3 reverse |
| Transmission type | Planetary powershift, with differential steering — the D8N was the first Cat track-type tractor fitted with differential steer as standard |
| Final drive | Double-reduction planetary |
| Ground pressure, standard shoe | 100.6 kPa (14.6 psi) |
| Drawbar pull | Not published in available spec sheets for this model; consult a dealer or the operator's manual drawbar-pull performance chart for gear-by-gear figures |
| Gradeability | Not documented in available spec sheets for this exact configuration |
Blades
| Blade types offered | Straight (S), Semi-Universal (SU), and Universal (U) blades were offered across the D8 platform this tractor belongs to; the S-blade is the configuration most consistently tied to published D8N spec sheets |
| Standard S-blade width | 3.96 m (13 ft) |
| Standard S-blade capacity | 8.7 cu m (11.4 cu yd) |
| Other blade capacities | SU and U blade capacity figures specific to the D8N are not consistently documented across spec sources; SU/U blade hardware sold for this platform is shared with the later D8R/D8T chassis, so figures for those should not be assumed identical for the D8N without direct confirmation |
Service capacities
| Fuel tank | 481-488 L (127-129 gal) |
| Cooling system | 74 L (19.6 gal) |
| Engine oil (with filter) | 37 L (9.8 gal) |
| Hydraulic/implement system | 57-70 L (15-18.5 gal), figure varies by source — likely reservoir-only vs total system fluid volume |
| Transmission/final drive oil | approx. 129 L (136 qt) combined powershift/steering system, per factory service data |
| Hydraulic system operating pressure | approx. 24 MPa (3,500 psi) |
| Hydraulic pump output | approx. 280 L/min (74 gpm) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D8N fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 37 L (9.8 US gal) | Cat Diesel Engine Oil (DEO). D8N ran the Cat 3406-family inline-six across its production run (3406, then 3406B, then 3406C depending on build year), gross rating up to about 306 hp (228 kW) / net 285 hp (213 kW) at 2100 rpm; crankcase fill stays the same across those engine variants. Use SAE 15W-40 for general service; drop to SAE 10W-30 in cooler climates and straight SAE 30 or 40 only where ambient stays warm and multigrade isn't available. Match oil to the coldest expected start-up temperature, not the daytime high. |
| Cooling system | 73.9 L (19.6 US gal) | Cat heavy-duty diesel engine antifreeze/coolant (glycol-based, factory-era equivalent of Cat DEAC) treated with Cat SCA (supplemental coolant additive). Full-strength mix protects to roughly -37°C (-34°F); adjust glycol/water ratio for local climate, minimum recommended concentration around 30-50% glycol. Check and maintain SCA level at scheduled intervals rather than a one-time fill. This machine's era predates Cat's long-life ELC as factory fill. |
| Fuel tank | 488 L (129 US gal) | No. 2-D diesel fuel for normal operation; blend with No. 1-D or use a winter-grade No. 2-D in cold weather to keep pour/cloud point below ambient. Keep tank topped at end of shift to limit condensation. |
| Power train - transmission and bevel gear/differential-steering compartment | 129 L (34.1 US gal) combined | Cat TDTO (Transmission/Drive Train Oil), TO-4 specification. SAE 30 covers most moderate ambient ranges; step down to SAE 10W in sustained cold and up to SAE 50 in sustained high heat, per the OMM's viscosity-by-temperature guidance. The D8N was Caterpillar's first track-type tractor with a differential-steer transmission, so the powershift transmission and the bevel-gear/steering section share one oil system and one combined refill figure in the OMM rather than the separate steering-clutch compartment used on earlier D8-family machines; a further sub-compartment split is not confirmed in available sources. |
| Final drives (each side) | 14 L (3.7 US gal) per side | Cat TDTO, TO-4 specification, same grade selection as the power train: SAE 30 for moderate climates, SAE 50 for sustained hot ambient, SAE 10W for sustained cold. Service both sides equally. |
| Hydraulic system/tank | 70 L (18.5 US gal) | Cat TDTO-class hydraulic-compatible oil (this era of track-type tractor commonly shares drivetrain-oil viscosity grades with the hydraulic reservoir rather than a separate dedicated hydraulic-only product line). Grade selection follows the same cold/moderate/hot viscosity pattern as the power train and final drives. System relief valve is set at roughly 24 130 kPa (3500 psi); pump flow is roughly 240 L/min (63.5 US gpm). Useful for cross-checking system health, not a fluid spec. |
| Pivot shaft / equalizer bar | Grease point, not a measured fluid-fill reservoir | Lubricate through the grease fitting on the documented interval; not part of the OMM's refill-capacity chart. Use the same multipurpose grease specified for the rest of the chassis. |
| Grease (all chassis/track/linkage points) | Per-fitting service, no single system capacity | Cat Multipurpose Grease (MPG), NLGI 2, lithium-complex base, effective roughly -30°C to 40°C (-22°F to 104°F) ambient. For sustained extreme heat or heavy shock-load pin joints, Cat's higher-temperature Prime/Extreme-duty grease lines are the climate-driven step-up; pick the grade for the expected ambient and duty cycle rather than defaulting to standard MPG in extreme conditions. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar D8N maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
| Every 12,000 h |
|
Servicing the D8N beyond the schedule
Predictive Maintenance & Fluid Analysis
Sample oil from each drivetrain system on a schedule: the combined differential-steer/power-train compartment, each final drive separately, and the engine crankcase. Because the D8N's steering clutches and transmission share one oil system, a single sample flags wear in either before it shows up as a steering complaint. Track coolant SCA/glycol concentration on this pre-extended-life-coolant machine rather than assuming a one-time fill lasts the whole interval. Pull hydraulic oil samples too, since the PAT blade and rear ripper draw off the same implement pump.
Corrective & Common Repairs
Watch the differential-steer clutch and brake packs for slipping or uneven turning response. This was Caterpillar's first application of that system on a track-type tractor, and early units see the most wear complaints. Turbocharger seal leaks and boost loss are common on both the 3406 and 3406C. Expect PAT blade lift/tilt cylinder seal replacement and rear ripper auxiliary-valve hydraulic leaks with age. Track sag drifts faster on bogie-suspended frames working rough ground than on rigid-frame units.
Overhaul & Rebuild Points
The 3406-family engine typically runs well past 10,000 hours before a top-end or in-frame overhaul under a disciplined oil-sample program. Undercarriage wear (rollers, idlers, sprockets, chain) is application-driven rather than fixed-hour: bogie-suspended frames working abrasive or rocky ground wear faster than rigid frames on stable underfoot conditions. Rebuild the differential-steer clutch packs and final drive planetaries when oil analysis or shift and turn quality signal wear, not on a blind calendar.
Seasonal & Environment Servicing
Adjust coolant glycol ratio and confirm SCA level before cold weather, since this era predates long-life coolant and depends on periodic additive top-up. Switch engine and TDTO viscosity grades for winter versus summer per the OMM chart, and blend winter-grade diesel to keep the pour point below ambient. Machines running a waste-disposal package need extra attention to cab sealing and air filtration in dusty landfill duty; forestry-guarded units need PAT cylinder and hose inspection for debris packing.
D8N common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 8T-6765 | Plug-Pipe | Scheduled service item | Check fitment → |
| 9S-8752 | Nut-Full | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D8N fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine Coolant Temperature warning lamp (gauge red zone / blinking indicator) | Coolant temperature has exceeded the machine's normal operating range on the mechanical 3406/3406B engine used in the D8N. | Low coolant level, plugged or debris-packed radiator core, slipping or damaged fan drive, bad thermostat, or (if the gauge disagrees with actual engine temp) a faulty coolant-temperature sender or wiring. | Idle down and shut off safely, check coolant level and radiator fins for blockage, check fan drive belt condition/tension, and verify the sender circuit before condemning the engine. |
| Engine Oil Pressure warning lamp (flashing) with audible alarm | Oil pressure has dropped below the switch point monitored by the gauge cluster. | Low oil level, worn oil pump, plugged suction screen or filter, or a failed pressure sender/wiring fault that keeps flashing even after a fresh oil and filter change. | Stop the engine immediately, check oil level and look for external leaks, then verify the sender and its wiring before restarting. |
| Torque Converter / Transmission Oil Temperature warning lamp (high-temp alarm) | Torque converter/transmission oil temperature has reached the machine's high-temperature alarm point, commonly cited around 125 C (257 F) on this machine. | Sustained heavy pushing or repeated high-load cycles, low transmission/converter oil level, a clogged transmission oil cooler, or a slipping converter. | Reduce load, shift to neutral and let the converter cool, check oil level and inspect the cooler for restriction, and confirm actual case temperature against the gauge if the alarm seems premature. |
| Transmission (Powertrain) Oil Filter Bypass indicator lamp | The filter bypass valve has opened, so transmission/torque-converter oil is bypassing a restricted filter element. | Filter element loaded with debris, cold oil viscosity at cold startup, or an incorrect filter. | Replace the transmission filter and recheck after the oil warms up; if the light returns quickly after a fresh filter, inspect for internal contamination. |
| Charging System / Low Alternator Voltage warning lamp | System voltage has dropped below the threshold the monitor expects from a properly charging system. | Worn or slipping alternator belt, failed alternator or regulator, or loose/corroded battery cable and ground connections. | Check belt tension and condition, test alternator output at the battery, and inspect grounds and connections for corrosion. |
| Hydraulic Oil Temperature warning lamp | Implement hydraulic oil temperature has exceeded the machine's normal operating range. | Low hydraulic fluid level, a plugged hydraulic oil cooler, or extended high-load ripping/blade work in hot ambient conditions. | Idle to allow cooling, check fluid level, clean the cooler core of debris, and verify the temperature sender if the reading seems inconsistent. |
| Parking Brake Engaged indicator lamp | The park brake switch shows the brake applied, normally lighting when the operator attempts to travel with the brake set. | Standard safety interlock warning during normal operation; occasionally a stuck switch or wiring fault if it stays on with the brake released. | Confirm the brake lever/switch position and release before traveling; if the lamp stays on with the brake released, check the switch and its wiring. |
| Monitor self-diagnostic flash code (technician-level, e.g. MID 030 sensor-circuit fault) | The Caterpillar Monitoring System's own DIAGNOSTIC lamp can flash a two-digit module/component code identifying a shorted or open sensor circuit feeding the gauge cluster (coolant temp, oil pressure, or transmission/converter temp senders), separate from the analog gauge alarms themselves. | Damaged sender, corroded connector, or chafed wiring on one of the monitored circuits rather than an actual out-of-range engine or transmission condition. | Count the lamp flash sequence or connect a Cat diagnostic tool at the cab diagnostic connector to identify which sensor circuit is faulted, then inspect that sender and its wiring. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
D8N attachments & work tools
Blades
Standard S (straight) blade measures about 3.96 m (13 ft) wide with roughly 8.7 m3 (11.4 yd3) capacity; an SU (semi-U) blade with shorter curvature and smaller side wings than a full U-blade is also documented for this class, trading some fine-grading control for more carrying capacity. Blade control is PAT (power-angle-tilt) hydraulic — raise/lower plus power angle and power tilt from the cab, no manual repinning. VPAT (variable-pitch-angle-tilt) is not offered on this size class; that option is reserved for Caterpillar's smaller D3-D6 dozers. A taller, higher-capacity waste/landfill blade (documented around 16.7 m3 / 21.8 yd3) was offered under the factory Waste Disposal Application package.
Rippers
Single-shank parallelogram ripper: one deep-penetrating tip for hard or rocky ground, with hydraulic lift and tilt cylinders fed from a rear auxiliary valve. Multi-shank ripper: a beam carrying several shank pockets for wider, shallower ripping in looser material, giving faster area coverage than the single-shank unit but less penetration depth per pass. A complete single-shank assembly (ripper structure, tyne with protector/tip, cylinders, hoses, mounting hardware, transmission guard) runs roughly 4.5 t (about 9,900 lb); the multi-shank assembly falls in a similar weight range.
Winches
The documented winch fit for this dozer class is a rear-mounted, two-speed towing/logging winch, originally a Hyster unit and later continued under Allied, driven off the tractor's power take-off rather than an auxiliary hydraulic circuit. It mounts in the same rear position used for a ripper or drawbar and was typically paired with a crawler-mounted logging arch for skidding logs to a landing. No Caterpillar-branded factory winch is documented for this model — winches were fitted as a specialist aftermarket/OEM attachment.
Drawbars/Counterweights
The rear of the tractor accepts either a rigid drawbar or a combined counterweight/hitch casting, mounted in the same position used for a ripper or winch. When a ripper or rear winch is fitted, a rear counterweight option rebalances the machine and properly loads the rear frame. The rear striker bar is counterweight-ready, so extra rear ballast can be added if the rear attachment calls for it.
Cab/ROPS Guarding (forestry/waste)
Base machine ships with a ROPS-protected operator station. For logging/forestry duty, dealer-fit guarding packages add screens over the glass, front and side window guards, light guards, and brush/limb protection around the blade area. For waste/landfill duty, the factory Waste Disposal Application (WDA) configuration bundled extra sealing, cab guarding, and cab air-handling equipment together with the taller, higher-capacity waste blade to cope with debris and contamination.
Hydraulic Arrangement (front/rear tools)
Front: PAT blades (S and SU) run off the tractor's implement hydraulic pump through lift plus angle/tilt cylinders, giving full hydraulic control with no manual repinning. Rear: a ripper draws off a separate rear-mounted auxiliary hydraulic valve circuit dedicated to its own lift and tilt cylinders. A rear winch, where fitted, is mechanically PTO-driven rather than hydraulically powered, so it does not share or compete with the ripper's hydraulic circuit.
All D8N assemblies by section
Every catalogued assembly group for the Caterpillar D8N. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Basic Engine
304-6674 Kit-Hardware
| 03***19 | Bolt; --To Bearing Ret. At Lower Front Shaft Bore | 11 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 3 |
308-2942 Kit-Hardware
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 0T***65 | Bolt--3/8" X 3 1/2"--Use As Required; Bolt 5t***56 Plate To Cover Gp 4n***72 | 8 |
| 11***87 | Seal-O-Ring (23.16 mm Id) | 1 |
Engine Arrangement
304-6670 Conversion Ar-Engine
| 03***79 | Seal-O-Ring (Id=10.82mm) | 1 |
| 0R***80 | Rod As-Connecting | 1 |
| 0R***72 | Crankshaft As | 1 |
304-6671 Conversion Ar-Engine
| 03***79 | Seal-O-Ring (Id=10.82mm) | 1 |
| 0R***80 | Rod As-Connecting | 1 |
| 0R***47 | Cylinder Pack Group | 6 |
Fuel System
124-5658 Control Gp-Fuel Ratio
| 10***93 | Washer | 1 |
| 11***58 | Washer; (12.7x6.65x0.79-mm Thk) | 1 |
| 12***57 | Spring-Fuel Ratio Control | 1 |
9y-4913 Fastener Gp-Fuel Inj Pump -Governor
| 1B***16 | Bolt; (1/4-20x5-In) | 2 |
| 4F***57 | Screw,Cap,Hexagon H Shock Mount To Bracket | 2 |
| 5P***37 | Washer 5t***54 Plate To 7t***28 Cable As | 2 |
7c-4797 Governor Gp
| 03***16 | Bolt-Self Locking; (1/4unc X 3/4) | 3 |
| 0S***47 | Bolt; (1/4-20x0.75-In)(Drilled Head) | 2 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 1 |
108-6633 Pump Gp-Fuel Injection
| 10***02 | Bonnet-Valve | 1 |
| 10***04 | Plunger & Barrel As | 1 |
| 10***33 | Pump Group-Fuel Injection | 1 |
104-4409 Pump Gp-Fuel Injection
| 0S***15 | Bolt 19 mm (.75 In.) Long Return Air Console To Enclosed Rops | 14 |
| 10***09 | Pump Group-Fuel Injection | 1 |
| 10***52 | Camshaft-Fuel Pump | 1 |
2w-8628 Torque Control Gp
| 1P***52 | Insulator,Bushing Governor | 1 |
| 2P***85 | Spacer (.635 mm Thk); (0.635-mm Thk) | 1 |
| 2W***34 | Bar-Load Stop; (4.0mm Thk) | 1 |
Service Equipment And Supplies
304-6667 Kit-Engine Parts
| 03***46 | Elbow, 90 Deg Adj., 1/4in. J.I.C. X 7/16in.-14 Str. Thd. | 1 |
| 06***40 | Seal-O-Ring (Id=37.69mm) | 1 |
| 10***48 | Ring-Guide | 1 |
304-6666 Kit-Engine Parts
| 03***46 | Elbow, 90 Deg Adj., 1/4in. J.I.C. X 7/16in.-14 Str. Thd. | 1 |
| 06***40 | Seal-O-Ring (Id=37.69mm) | 1 |
| 10***48 | Ring-Guide | 1 |
309-3790 Kit-Engine Parts
| 03***46 | Elbow, 90 Deg Adj., 1/4in. J.I.C. X 7/16in.-14 Str. Thd. | 1 |
| 06***40 | Seal-O-Ring (Id=37.69mm) | 1 |
| 10***48 | Ring-Guide | 1 |
D8N serial number reference
The D8N serial/PIN plate is riveted to the frame on the right side near the rear of the machine, with the number also stamped into the frame itself as a backup. The plate shows the Product Identification Number: the first three characters are the letter/number prefix that identifies the model's build series and configuration (e.g. 9TC, 1XJ, 5TJ), and the digits following it are the sequential unit number within that series.
| Prefix | Identifies | Notes |
|---|---|---|
| 9TC | D8N track-type tractor, suspended (bogie) undercarriage | Earliest D8N production series, tied to the model's 1987 launch. Build-dated units from 1988-1989 are documented in dealer/auction records. Differential-steer transmission, Cat 3406 diesel rated 213 kW (285 hp). |
| 1XJ | D8N track-type tractor, non-suspended (rigid) undercarriage | Early-1990s production run, documented units dating to roughly 1990-1992. Distinguished in undercarriage/track literature from the 9TC, 5TJ and 7TK groups by rigid rather than bogie-suspended track roller frames. Differential-steer transmission, Cat 3406/3406C diesel. |
| 5TJ | D8N track-type tractor, suspended (bogie) undercarriage | Later D8N production series. Build-dated units from 1992 through 1994-1995 are documented, running to near the end of D8N production before the D8R replaced it. Differential-steer transmission, Cat 3406C diesel. |
| 7TK | D8N track-type tractor, suspended (bogie) undercarriage | Its own D8N serial break, grouped with 9TC and 5TJ under bogie-suspended undercarriage in factory parts literature for the 3406-family engine arrangement. Exact production-year span not confirmed in available listings - verify with your dealer. |
| 8WC | D8N track-type tractor (configuration not documented) | Documented D8N serial break, paired with 9TC1-and-up in the factory operator's manual, suggesting an early or parallel run alongside the 9TC group. Undercarriage configuration and production dates not independently confirmed - verify with your dealer. |
Frequently asked questions
What engine does the Caterpillar D8N use?
A Cat 3406 turbocharged, aftercooled inline-six diesel. Early production tractors used the mechanical 3406/3406B; later-production D8N units moved to the electronically-assisted 3406C. Gross output is about 228 kW (306 hp) and net output about 213 kW (285 hp) at 2100 rpm, depending on the exact engine variant and rating source.
What is the operating weight of a Caterpillar D8N?
Bare shipping weight runs about 26,400 kg (58,300 lb). Loaded operating weight with a standard S-blade lands near 37,500 kg (82,600 lb), while a dozer-plus-ripper configuration runs closer to 36,000 kg (79,400 lb). The exact figure varies by blade type, ripper, track shoe width, and other attachments.
What replaced the Caterpillar D8N?
The D8R replaced the D8N starting in 1996, keeping the differential-steer transmission the D8N introduced while stepping up engine output. The D8R was later replaced by the D8R Series II, and eventually by the D8T.
What D8N owners discuss
What's the real story on the D8N's engine across its production run, and what wear issues show up at high hours?
What differential-steer transmission quirks does the D8N have, and what does 'won't move' usually mean?
How does the D8N's undercarriage differ across serial ranges, and what wear pattern should I expect?
What electrical or gauge problems come up most on the D8N?
Are there cold-starting quirks specific to the D8N?
What should I check before buying a used D8N?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific D8N part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.