Caterpillartrack-type tractor
Caterpillar D8H
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar D8H is a large crawler (track-type) tractor/dozer built from 1958 to 1974, about 16 years of continuous production. It runs Caterpillar's own D342 diesel, developed specifically for the D8 line, in its turbocharged D342T form; the D8H was the first D8 to get the turbocharged version of that engine. The engine is fully mechanical, with mechanical fuel injection and no electronic controls. Flywheel output started at 168 kW (225 hp) in 1958, rose to 175 kW (235 hp) in 1961, and climbed in further stages to roughly 201-209 kW (270-280 hp) by the early 1970s. Operating weight varies widely by series and equipment: lighter early direct-drive and torque-converter machines ran around 18.6-21.3 t (41,000-47,000 lb), while later production fitted with a dozer blade and rear ripper commonly reached about 31-32 t (68,000-71,000 lb), with some heavily optioned late units reported near 36 t (79,000 lb). Caterpillar offered the D8H in direct-drive, torque-converter, and powershift drivetrain configurations with a choice of blade types and a rear ripper, without the Std/XL/LGP width trims later D8 generations offered. It followed the D8F/D8G lineage and was replaced by the D8K in 1974.
Across its run, the D8H picked up a wider 2.13 m (84 in) gauge and hydraulically actuated steering clutches in place of the air-actuated clutches used on its D8F/D8G predecessors, on top of the stepped power increases noted above as turbocharger boost and engine tuning improved. Caterpillar built the model in the United States and at its Birtley, England plant for markets outside North America, where it carried separate series designations. Of the drivetrain options, the powershift line was built in far greater numbers than the direct-drive or torque-converter versions. Because it predates electronic engine and transmission controls, the D8H still appeals to owners who want a simple, field-serviceable mechanical drivetrain, and a strong aftermarket in undercarriage, engine, and final-drive components keeps rebuilt and running units viable for land-clearing, forestry, and heavy dozing work. It also holds a place in the vintage/collector crawler-tractor market as the last of Caterpillar's D342-powered D8 line before the D8K introduced a new engine and running-gear generation.
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 D8H specifications
Engine
| Engine model | Caterpillar D342T, 6-cylinder inline diesel, turbocharged, direct injection, liquid-cooled |
| Displacement | 20.4 L (1,246 cu in) |
| Bore x stroke | 146 mm x 203 mm (5.75 in x 8.00 in) |
| Power - early production (1958/59 introduction) | approx. 168-175 kW (225-235 hp) flywheel, governed near 1,240 rpm |
| Power - later production (from the mid/late-1960s serial break) | approx. 201 kW (270 hp) flywheel, governed near 1,280 rpm; some references cite up to approx. 209 kW (280 hp) in the final production years before 1974. The uprating came with a smaller, faster-spooling turbocharger and increased fuel delivery, not a different base engine. |
| Variant guard | The D8H used this lower/mid-output D342T tune throughout its life. A higher-output D342T tune rated around 224 kW (300 hp) exists but belongs to the successor D8K, not the D8H - do not merge the two. |
| Emissions | Predates emissions certification. Mechanically governed fuel system, no electronic controls, no aftertreatment. |
Weights
| Configuration note | The D8H was not sold in Std/XL/LGP trims like later Cat dozers. Its configuration split is by drivetrain: direct drive, torque-converter drive, and 3-speed powershift. No low-ground-pressure (LGP) wide-track variant is documented for the D8H specifically; that nomenclature became standard on later D8 generations. |
| Bare tractor weight - direct drive / torque-converter drivetrains | approx. 18.6-22.7 t (41,000-50,000 lb) depending on drivetrain, per era literature and parts documentation |
| Bare tractor weight - powershift drivetrain | toward the upper end of that range, approx. 22-22.7 t (49,000-50,000 lb) |
| As-equipped weight (blade + ripper + ROPS canopy, typical field configuration) | commonly documented near 31-32 t (68,000-71,000 lb) on surviving powershift units with full attachments |
| Weight variance note | Operating weight swings widely with attachments. Treat any single published 'operating weight' figure with caution and confirm against the specific unit's equipped configuration. |
Dimensions
| Overall length (blade attached) | approx. 6.55 m (21 ft 6 in) per general spec compilations; individual as-sold units are sometimes measured to a different reference point, so treat as approximate |
| Overall width | approx. 2.79-2.82 m (9 ft 2 in - 9 ft 3 in) |
| Overall height | approx. 3.35-3.40 m (11 ft - 11 ft 2 in) with ROPS/canopy fitted; approx. 2.54 m (8 ft 4 in) with canopy removed |
| Track gauge (center to center) | approx. 2.13 m (84 in) - notably wider than the pre-H D8's narrower gauge, one of the D8H's redesign points |
| Track shoe width (standard) | 559 mm (22 in) grouser shoe |
| Blade width | varies by blade type, approx. 3.7-4.1 m (12 ft 2 in - 13 ft 6 in); tilting an angling blade narrows the effective working width to approx. 3.5 m (11 ft 6 in) |
| Blade height | approx. 1.5 m (5 ft) on a standard dozing blade |
| Ground clearance | not documented in accessible literature for this vintage model - confirm against the OEM operator's manual for your serial range |
Performance
| Transmission options | Direct drive, torque-converter drive, and a 3-speed powershift were all offered across the production run. The powershift version was the volume seller and is the most commonly encountered surviving configuration. |
| Travel speeds (forward/reverse) | not documented in accessible public references for this vintage model. Per-gear speed charts were not part of the standard published literature format used for this era's tractors the way later Cat spec sheets present them - consult dealer or OEM documentation for the exact figures on a given serial prefix. |
| Drawbar pull | not documented in accessible public specs for the D8H specifically. The much lower-powered pre-H D8 predecessor (roughly half the flywheel output) is not a valid substitute figure and is excluded here to avoid misattribution. |
| Ground pressure | not documented in accessible public sources for the D8H specifically - verify against OEM literature or a certified reweigh for your unit's shoe width and equipped weight. |
| Gradeability | not documented in accessible sources for this model. |
Blades
| Blade types offered | Straight, semi-U, and angling/U-blade configurations were offered, consistent with the broader D8-family blade lineup of the era. |
| Blade capacity | Factory literature from this era did not publish a rated SAE blade capacity in cubic meters/yards the way later Cat spec sheets do. Only blade width and height dimensions are documented for the D8H. |
| Blade width | approx. 3.7-4.1 m (12 ft 2 in - 13 ft 6 in) depending on blade type; narrows to approx. 3.5 m (11 ft 6 in) effective width when angled |
| Blade height | approx. 1.5 m (5 ft) |
| Ripper | A rear-mounted ripper was offered as an attachment, in both single-shank and multi-shank arrangements, for breaking up rock and hardpan ahead of dozing passes. |
Service capacities
| Fuel tank | approx. 507 L (134 US gal) per one equipment reference; not independently cross-verified elsewhere in public specs for this model - confirm against the tank or operator's manual for your unit |
| Engine oil (crankcase) | approx. 33 L (8.7 US gal), per service documentation for this model |
| Cooling system | not documented in accessible public sources for the D8H specifically - verify against the OEM service manual |
| Hydraulic / torque-converter oil | not documented in accessible public sources for the D8H specifically - verify against the OEM service manual |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D8H fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) - D342 diesel | 33 L (35 US qt / 8.7 US gal). Fill to the dipstick mark; treat the refill figure as a guideline only, not the exact drain-and-fill volume. | Caterpillar-approved detergent diesel engine oil (era-correct Cat DEO-class HD oil). Viscosity by ambient temperature: SAE 30 above roughly 4°C (40°F); SAE 10W between about 4°C and -18°C (40°F to 0°F); a lighter arctic-grade oil below that for cold starting. Owners commonly run a modern 15W-40 heavy-duty diesel oil as the practical equivalent. |
| Cooling system | 117.4 L (124 US qt, about 31 US gal), per factory-level reference data for the 46A/68A power-shift series. Verify at the radiator sight glass/filler, since aftermarket radiators can vary slightly from factory volume. | Clean water mixed with a Caterpillar-approved permanent-type (ethylene-glycol) antifreeze/coolant plus a Cat-approved supplemental coolant additive for corrosion/cavitation protection. Set the glycol/water ratio for the coldest expected ambient temperature. |
| Fuel tank | 507 L (134 US gal), per factory-level reference data for the 46A series. Earlier direct-drive/torque-converter D8H variants (36A/35A, and UK-built 22A/52A) are not separately confirmed and may differ. | No. 2-D diesel fuel for normal operation; No. 1-D diesel fuel in cold weather to reduce waxing/gelling and aid cold starting. |
| Transmission / power-train case (power shift transmission, or direct-drive transmission, combined with the bevel gear and steering clutch compartments) | 117.4 L (124 US qt, about 31 US gal) total, per factory-level reference data - documented the same for both the 3-speed power shift transmission and the 6-speed direct-drive transmission option on the 46A series, and consistent with the combined figure carried over on the successor model's power shift case. The lubrication chart in the OMM breaks this case into separate check/fill points for the transmission, bevel gear, and steering clutch (brake) sections; only the combined refill total is corroborated here, not the individual sub-splits. | Caterpillar TDTO (Transmission/Drive Train Oil) specification gear oil. Seasonal SAE grade: SAE 10W in cold weather, SAE 30 in moderate ambient temperatures, SAE 50 in sustained hot-climate or heavy-load service. |
| Final drives (each side) | Not corroborated in available reference sources for this generation. Each final drive is its own sealed compartment with its own check/fill plug; confirm the exact figure against the OMM or parts book for the specific serial-number range. | Caterpillar TDTO-specification gear oil, same seasonal SAE grading as the transmission/bevel-gear case (SAE 10W/30/50 by ambient temperature). |
| Hydraulic / blade-control system | Not documented in available reference sources. Blade control on the D8H was cable-operated (winch and sheaves) on many units and power-angle-tilt (hydraulic) on others depending on the attachment fitted; no single hydraulic-tank capacity applies across configurations. | On units fitted with hydraulic blade control, use Caterpillar-specification hydraulic oil (Cat HYDO-equivalent), graded by season the same way as engine oil. Confirm tank capacity against the OMM for the specific blade-control equipment installed. |
| Pivot shaft / equalizer bar | Not documented for the D8H generation in available reference sources. Later D8-family generations list a separate serviceable pivot-shaft compartment; this has not been confirmed as applicable to the D8H's equalizer-bar arrangement. | If a serviceable pivot-shaft compartment is fitted, use Caterpillar TDTO-specification gear oil per the machine's own lubrication chart. |
| Chassis grease (track idlers/rollers, cable sheaves, bulldozer tilt brace and ball-and-socket, steering/cable-control linkage, etc.) | No bulk reservoir - serviced fitting by fitting on the 10-, 50-, 100-, and 250-hour lubrication intervals per the chart (varies by attachment fitted, e.g. cable-control sheaves vs. hydraulic tilt brace). | Caterpillar multipurpose-type grease, NLGI Grade 2 with EP (extreme-pressure) additive, for general chassis and track-roller/idler fittings. Switch to a softer NLGI 1 or 0 EP grease in sustained sub-freezing weather where called for. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar D8H maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 6,000 h |
|
Servicing the D8H beyond the schedule
Predictive Maintenance & Fluid Analysis
The D8H predates electronic diagnostics, so condition monitoring is manual. Draw scheduled samples of D342T engine oil, torque-converter or powershift oil, and coolant to catch turbocharger bearing wear, fuel-injection wear metals, or final-drive gear wear before a failure sidelines the machine. Check final drive and transmission drain plugs for metal fines at every oil change. Feel for turbocharger shaft play and listen for boost loss by ear. On a purely mechanical drivetrain like this, fluid analysis is the closest thing to a warning light.
Corrective & Common Repairs
Common D8H fixes center on the steering and fuel systems. Brake-band linings wear unevenly and pull the machine to one side; relink and adjust the band before the lining glazes. Hydraulically actuated steering clutch packs drag or slip with age and need readjustment or disc replacement. Decades-old mechanical injection pumps and nozzles drift out of calibration, causing smoke and power loss, so have them tested rather than guessed at. Oil-bath air cleaner seals dry out and let dust reach the D342T, so seal condition and track sag need frequent checks.
Overhaul & Rebuild Points
At rebuild time, plan on the D342T's turbocharger, liners, pistons, and injection pump needing attention together, since turbo wear and injector drift both push up oil consumption and exhaust smoke over a long service life. Torque-converter or powershift clutch packs wear as a unit and are normally rebuilt alongside the final drives, given their shared duty cycle. Undercarriage components (chain, rollers, idlers, sprockets) are best replaced as a matched set rather than piece by piece, since mixed wear stages on a machine this old accelerate re-wear.
Seasonal & Environment Servicing
Cold starting is the D8H's signature seasonal issue. Early production relied on a small gasoline pony motor to warm and crank the D342T, and its fuel lines, points, and drive clutch need dedicated seasonal checks; later electric-start machines need battery, starting-aid, and coolant checks instead. In hot, dusty work, shorten air cleaner and precleaner service intervals and inspect the turbocharger and radiator core for packed debris. Track and final-drive seals also dry and shrink in extreme heat or freeze-thaw cycles, so check them more often in those conditions.
D8H common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1H-1444 | Transfer--Oil Filter Instructions--1 7/8" High | Lubrication service | Check fitment → |
| 8H-4973 | Oil Filter Assembly | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D8H attachments & work tools
Blades
D8H blades were offered in Straight (S), Angle (A), Universal (U) and Semi-U (SU) profiles typical of the D8 class. Width runs roughly in the 3.7-4.3 m (12-14 ft) class depending on profile; U/SU blades carry more material for stockpiling and land-clearing while S and A blades suit fine grading and side-casting. Early production used cable-and-clutch blade control; hydraulic lift/angle/tilt cylinders became standard through the 1960s and were the only control offered by the end of the run. VPAT (variable pitch/angle/tilt) blades are a later Cat design for smaller dozers and do not apply to the D8H.
Rippers
Ripper choices for this class split into single-shank and multi-shank (commonly three-shank) parallelogram units, plus a heavier single-shank radial-arm design for deeper penetration. Single-shank rippers suit hard-packed, frozen, or rocky ground and stump/root work; multi-shank rippers cover more ground faster in lighter or shale-type material but with less per-tooth penetration force. Ripper weight and lift/tilt cylinder arrangement vary by configuration (single vs multi-shank, parallelogram vs radial-arm), so match the specific unit's linkage to the tractor's rear hydraulic circuit before fitting.
Winches
D8H-era winches are power-shift, rear-mounted units driven mechanically off the tractor's own torque-converter/powershift drive, common on cable-control machines used for logging and skidding. Hydraulic-motor-driven winch designs only entered the market toward the end of the D8H's production run and are more associated with later dozer generations. A winch fitment typically occupies the same rear mounting area as a ripper, so a given machine is normally set up with one or the other, not both.
Drawbars/counterweights
A rear drawbar/pull-hook is standard for towing and skidding loads and also serves as the mounting base for a winch or ripper frame. Bolt-on rear counterweight can be added to improve stability and traction when running a winch or heavy ripper, or to balance out a lighter blade-only setup. Drawbar, counterweight, ripper and winch fitments compete for the same rear frame space, so configuration is a trade-off rather than all being carried at once.
Cab/ROPS guarding (forestry/waste)
Factory D8H operator stations are open (OROPS); forestry and waste-handling guarding on this model is typically a dealer- or aftermarket-fitted package rather than a factory line item. Common additions include mesh or bar screen guards over the front, side, and door openings, a radiator/grille brush guard, underside/belly guarding, and light guards to protect against branches and debris. Guarding level varies by application (logging vs landfill/waste) and there is no documented factory sealed, pressurized cab option for this era of machine.
Hydraulic arrangement (front/rear tools)
On hydraulically-controlled D8H units, front blade lift/angle/tilt cylinders and rear ripper lift/tilt cylinders normally run off separate pump and valve circuits, allowing the two ends to be worked independently. A rear-mounted winch, where fitted, is driven mechanically off the powershift/torque-converter train rather than the hydraulic system, and shares mounting space with the ripper rather than running alongside it. Earlier and mid-production cable-control machines route blade movement through cables and clutches instead of the later all-hydraulic circuit, so control type should be confirmed before assuming hydraulic compatibility.
All D8H assemblies by section
Every catalogued assembly group for the Caterpillar D8H. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
1m1331 Air Cleaner Inlet Extension Group
7m913 Air Filter Service Indicator Group
7m914 Air Filter Service Indicator Group
6h3754 Auxiliary Seat Group
| 6H***54 | Auxiliary Seat Group | 1 |
4j9449 Blade Tilt Control Lines Group--Type 2
| 4J***49 | Blade Tilt Control Lines Group; Control Lines Group Blade Tilt | 1 |
4j9449 Blade Tilt Control Lines Group--Type 1
| 4J***49 | Blade Tilt Control Lines Group; Control Lines Group Blade Tilt | 1 |
5m4255 Blower Fan And Guard Group--Type 1
5m4255 Blower Fan And Guard Group--Type 2
1m3425 Blower Fan And Guard Group
5m1097 Blower Fan Group--Self-Cleaning
| 5M***97 | Blower Fan Group | 1 |
5m1097 Blower Fan Group--Self Cleaning
| 5M***97 | Blower Fan Group | 1 |
7m3420 Brush Guard Group
2m3305 Brush Guard Group--Replaces 9h7865
1s861 Brush Guard Group
1s860 Brush Guard Group--Replaces 2m3305
9h7865 Brush Guard Group
9h7916 Bumper Group
| 9H***16 | Bumper Group | 1 |
1s1002 Cab Group--Part 2 Of 2--Replaces 9h7736
| 1S***02 | Cab Group | 1 |
9h7736 Cab Group--Front View--Part 2 Of 2
| 9H***36 | Cab Group | 1 |
1s1002 Cab Group--Part 1 Of 2--Replaces 9h7736
| 1S***02 | Cab Group | 1 |
9h7736 Cab Group--Side View--Part 1 Of 2
| 9H***36 | Cab Group | 1 |
4m490 Cab Heater Group--Recirculating--12 Volt--Type 2
4m490 Cab Heater Group--Recirculating--12 Volt--Type 3
4m490 Cab Heater Group--Recirculating--12 Volt--Type 1
1m4261 Cab Heater Group--Recirculating--6 Volt
1m4134 Canopy Curtain Group--Type 2
| 1M***34 | Canopy Curtain Group | 1 |
1m4134 Canopy Curtain Group--Type 1
| 1M***34 | Canopy Curtain Group | 1 |
1m2546 Canopy Group--Type 2
| 1M***46 | Canopy Group | 1 |
1m2546 Canopy Group
| 1M***46 | Canopy Group | 1 |
3j7690 Control Lever Housing Group
| 3J***90 | Control Lever Housing Group | 1 |
1s8717 Counterweight Group--3500 Pounds
| 1S***17 | Counterweight Group | 1 |
5m3967 Counterweight Group--3976 Pounds
| 5M***67 | Counterweight Group | 1 |
7s9655 Crankcase Guard Group
7m3336 Crankcase Guard Group--Replaces 2m9625
2m9625 Crankcase Guard Group
2s9414 Crankcase Guard Group
9m150 Crankcase Guard Group--Replaces 7m3336
9h5368 Decelerator Control Group--Type 2
| 9H***68 | Decelerator Control Group | 1 |
9h5368 Decelerator Control Group--Type 1
| 9H***68 | Decelerator Control Group | 1 |
5m2022 Defroster Fan Group--12 Volt--Type 3
| 5M***22 | Defroster Fan Group | 1 |
5m2022 Defroster Fan Group--12 Volt
| 5M***22 | Defroster Fan Group | 1 |
5m2023 Defroster Fan Group--6 Volt--Replaces 6h1151
| 5M***23 | Defroster Fan Group | 1 |
5m2022 Defroster Fan Group--12 Volt--Type 2
| 5M***22 | Defroster Fan Group | 1 |
6h1151 Defroster Fan Group--6 Volt
| 6H***51 | Defroster Fan Group | 1 |
8h4219 Drawbar Group--Swinging
| 8H***19 | Drawbar Group | 1 |
4j5350 External Control Valve Group
| 4J***50 | External Control Valve Group | 1 |
1s4791 Fan Group--Reversible Blade--Type 2
1s4791 Fan Group--Reversible Blade--Type 1
1s4791 Fan Group--Reversible Blade--Type 3
9m937 Fan Group--Reversible Blade
9h1847 Final Drive Steel Case Group--Second Type
| 9H***47 | Final Drive Case | 1 |
9h1847 Final Drive Case--Steel
| 9H***47 | Final Drive Case | 1 |
8m367 Final Drive Wear Guard Group
| 8M***67 | Final Drive Wear Guard Group | 1 |
2m856 Flood Lamp Assembly--12 Volt--Type 2
| 2M***56 | Flood Lamp Assembly | 1 |
2m856 Flood Lamp Assembly--12 Volt
| 2M***56 | Flood Lamp Assembly | 1 |
1m4260 Fresh Air Cab Heater Group--6 Volt
4m491 Fresh Air Cab Heater Group--12 Volt
2h9476 Front Pull Hook Group
| 2H***76 | Front Pull Hook Group | 1 |
1m1539 Front Pull Hook Group
| 1M***39 | Front Pull Hook Group | 1 |
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
1m3377 Flood Lamp Assembly--6 Volt--Type 1
| 1M***77 | Head Lamp Assembly | 1 |
1m3377 Flood Lamp Assembly--6 Volt--Type 2
| 1M***77 | Head Lamp Assembly | 1 |
2m7930 Heater Assembly--12 Volt
7h7850 Heater Assembly--6 Volt
4j9451 Hydraulic Control Arrangement--Blade Tilt
| 4J***50 | External Control Valve Group | 1 |
| 4J***09 | Pump Lines Group | 1 |
| 4J***49 | Blade Tilt Control Lines Group; Control Lines Group Blade Tilt | 1 |
5j745 Hydraulic Pump Assembly
| 5J***45 | Hydraulic Pump Assembly | 1 |
4m566 Lighting System Group--12 Volt--4 Lamp--Type 2
| 4M***66 | Lighting System Group | 1 |
1m3080 Lighting System Group--6 Volt, 4 Lamp--For Use With Cab
| 1M***80 | Lighting System Group | 1 |
4m564 Lighting System Group--12 Volt, 2 Lamp--For Use With Cab--Type 2
| 4M***64 | Lighting System Group | 1 |
4m566 Lighting System Group--12 Volt, 4 Lamp--For Use With Cab
| 4M***66 | Lighting System Group | 1 |
1m3077 Lighting System Group--6 Volt, 2 Lamp--For Use Without Cab
| 1M***77 | Lighting System Group | 1 |
4m565 Lighting System Group--12 Volt, 4 Lamp--For Use Without Cab
| 4M***65 | Lighting System Group | 1 |
1m3079 Lighting System Group--6 Volt, 4 Lamp--For Use Without Cab
| 1M***79 | Lighting System Group | 1 |
4m563 Lighting System Group--12 Volt, 2 Lamp--For Use Without Cab
| 4M***63 | Lighting System Group | 1 |
1m3078 Lighting System Group--6 Volt, 2 Lamp--For Use With Cab
| 1M***78 | Lighting System Group | 1 |
4m564 Lighting System Group--12 Volt, 2 Lamp--For Use With Cab
| 4M***64 | Lighting System Group | 1 |
Name Plate And Transfers
| 1H***44 | Transfer--Oil Filter Instructions--1 7/8" High | 1 |
| 1H***38 | Transfer Safety First | 1 |
| 2M***78 | Transfer-- Capacity-- Fuel Oil | 1 |
4h5076 Air Precleaner Group
5j746 Pump And Mounting Group
| 5J***46 | Pump And Mounting Group | 1 |
4j8609 Pump Lines Group
| 4J***09 | Pump Lines Group | 1 |
2j9546 Push Block Group
| 2J***46 | Push Block Group | 1 |
5j4843 Push Block Group
| 5J***43 | Push Block Group | 1 |
3j8148 Push Block Group--Replaces 3j8147
| 3J***48 | Push Block Group | 1 |
2j9546 Push Block Group--Second Type
| 2J***46 | Push Block Group | 1 |
3j8147 Push Block Group
| 3J***47 | Push Block Group | 1 |
3j7340 Push Block Group
| 3J***40 | Push Block Group | 1 |
3j1806 Push Block Hitch Group
4j1241 Push Plate Group
| 4J***41 | Push Plate Group | 1 |
4j8076 Push Plate Group
| 4J***76 | Push Plate Group | 1 |
9h7900 Push Plate Group
| 9H***00 | Push Plate Group | 1 |
3s7121 Radiator Conversion Group--Center Support
9s8276 Radiator Grill Hinged Plate Group--Factory Installation Only
9s8204 Radiator Guard Hinge Group--Field Installation
1s4153 Rain Cap Group--Starting Engine
5s3171 Sender Group--12 Volt--Type 2
| 5S***71 | Sender Group | 1 |
5s3171 Sender Group--12 Volt--Type 1
| 5S***71 | Sender Group | 1 |
4m6080 Seven Roller Track Roller Frame Group
| 4M***80 | Seven Roller Track Roller Frame Group | 1 |
8m432 Seven Roller Track Roller Frame Group--Type 2
| 8M***32 | Seven Roller Track Roller Frame Group | 1 |
8m432 Seven Roller Track Roller Frame Group--Type 1
| 8M***32 | Seven Roller Track Roller Frame Group | 1 |
5j4946 Spring Group
4j8060 Spring Group
5j4953 Spring Group
1m499 Street Plate Group--Full Set
| 1M***00 | Street Plate Group | 1 |
3s7120 Support Group--Type 2
3s7120 Support Group--Type 1
5m8732 Swinging Drawbar Group
| 5M***32 | Swinging Drawbar Group | 1 |
5m3332 Switch Assembly--12 Volt
8m9316 Tail Lamp Assembly
| 8M***16 | Tail Lamp Assembly | 1 |
7f9853 Tail Lamp Assembly--6 Volt
| 7F***53 | Tail Lamp Assembly | 1 |
2m7886 Tail Lamp Assembly--12 Volt
| 2M***86 | Tail Lamp Assembly | 1 |
8m9854 Tool Group
| 8M***54 | Tool Group | 1 |
8h8177 Tool Group
| 8H***77 | Tool Group | 1 |
9s7977 Hand Tool Group
| 9S***77 | Tool Group-Hand | 1 |
Tools (8m8830 N/S)
1m429 Track Group--20" Grouser Shoe--2 Groups Required
| 1M***29 | Track Group | 1 |
2m7002 Track Group--22" Manganese Shoe--2 Groups Required
| 2M***02 | Track Group | 1 |
5m2891 Track Group--22" Grouser Shoe--2 Groups Required
| 5M***91 | Track Group | 1 |
1m438 Track Group--26" Grouser Shoe--2 Groups Required
| 1M***38 | Track Group | 1 |
7m750 Track Group--24" Grouser Shoe--2 Groups Required
| 7M***50 | Track Group | 1 |
7m748 Track Group--24" Grouser Shoe--2 Groups Required
| 7M***48 | Track Group | 1 |
1m444 Track Group--28" Grouser Shoe--2 Groups Required
| 1M***44 | Track Group | 1 |
4m8345 Track Group--20" Manganese Shoe--2 Groups Required
| 4M***45 | Track Group | 1 |
7m749 Track Group--22" Grouser Shoe--2 Groups Required
| 7M***49 | Track Group | 1 |
Track Groups--2 Required
Track Groups
Track Groups--2 Groups Required
4s6718 Track Roller Group
| 4S***18 | Track Roller Group | 1 |
4s6717 Track Roller Guard Group
| 4S***17 | Track Roller Guard Group | 1 |
5m5020 Track Roller Guard Group
| 5M***20 | Track Roller Guard Group | 1 |
8m7492 Track Roller Guard Group
| 8M***92 | Track Roller Guard Group | 1 |
8m437 Track Roller Guard Group
| 8M***37 | Track Roller Guard Group | 1 |
8m9447 Track Roller Guard Group
| 8M***47 | Track Roller Guard Group | 1 |
5m6599 Track Roller Guard Group
| 5M***99 | Track Roller Guard Group | 1 |
8m7493 Track Roller Guard Group
| 8M***93 | Track Roller Guard Group | 1 |
8m9446 Track Roller Guard Group
| 8M***46 | Track Roller Guard Group | 1 |
9h9328 Track Roller Guard Group
| 9H***28 | Track Roller Guard Group | 1 |
8m1129 Track Roller Guard Group
| 8M***29 | Track Roller Guard Group | 1 |
9s6782 Track Sprocket Adapter Group--Field Installation
| 9S***82 | Track Sprocket Adapter Group | 1 |
8s3015 Track Sprocket Adapter Group
| 8S***15 | Track Sprocket Adapter Group | 1 |
4s8971 Track Sprocket Adapter Group--Field Installation
| 4S***71 | Track Sprocket Adapter Group | 1 |
8s3022 Track Sprocket Group
| 8S***22 | Track Sprocket Group | 1 |
3s9188 Track Sprocket Group--Field Installation
| 3S***88 | Track Sprocket Group | 1 |
1s9616 Windshield Wiper Group--12 Volt--Replaces 4m470
| 1S***16 | Windshield Wiper Group | 1 |
4m470 Windshield Wiper Group--12 Volt
| 4M***70 | Windshield Wiper Group | 1 |
8f7299 Windshield Wiper Group--6 Volt
| 8F***99 | Windshield Wiper Group | 1 |
Clutch, Transmission And Chassis
7m5202 Track Carrier Roller Group--4 Required
| 7M***02 | Roller Group-Track Carrier | 1 |
5m8674 Brake Band Assembly--2 Required
| 5M***74 | Band & Lining As | 1 |
5m8674 Brake Band Assembly--2 Assemblies Required
| 5M***74 | Band & Lining As | 1 |
4m3759 Band Assembly--2 Assemblies Required
| 4M***59 | Band Assembly | 1 |
Bevel Gear Case And Covers
5m2914 Brake Band Assembly--2 Required--Field Installation
| 5M***14 | Brake Band Assembly | 1 |
Brake Hydraulic Mechanism
Brake Hydraulic Mechanism (9h7700 N/S)
| 9H***00 | Brake Hydraulic Mechanism Group | 1 |
9h7700 Brake Hydraulic Mechanism Group
| 9H***00 | Brake Hydraulic Mechanism Group | 1 |
Brakes--Side View--Part 1 Of 2
Brakes--Top View--Part 2 Of 2
9h5110 Flywheel Clutch Group--Part 1 Of 3
| 9H***10 | Clutch Group-Flywheel | 1 |
9h5110 Flywheel Clutch Group--Part 2 Of 3
| 9H***10 | Clutch Group-Flywheel | 1 |
9h5110 Flywheel Clutch Group--Part 3 Of 3
| 9H***10 | Clutch Group-Flywheel | 1 |
3s7024 Drawbar Bracket Group--Field Installation
| 3S***24 | Drawbar Bracket Group | 1 |
8h3383 Drawbar Group
| 8H***83 | Drawbar Group | 1 |
Equalizer And Suspension Bar
2m9617 Equalizer And Suspension Bar Group
| 2M***17 | Equalizer And Suspension Bar Group | 1 |
9s2976 Equalizer Bar Group--Factory Installation
| 9S***76 | Equalizer Bar Group | 1 |
Fenders--Part 1 Of 2
Fenders--Part 2 Of 2
Final Drive--Part 1 Of 2
Final Drive--Part 2 Of 2
Final Drive Oil System
7s1994 Final Drive Seal Group
8m7441 Final Drive Seal Group--2 Required
| 8M***41 | Final Drive Seal Group | 1 |
5m5038 Flow Control And Relief Valve Group
| 5M***38 | Flow Control And Relief Valve Group | 1 |
2p7223 Flywheel Clutch Group--Field Installation--Part 4 Of 4
| 2P***23 | Flywheel Clutch Group | 1 |
2p7223 Flywheel Clutch Group--Field Installation--Part 3 Of 4
| 2P***23 | Flywheel Clutch Group | 1 |
2p7223 Flywheel Clutch Group--Field Installation--Part 2 Of 4
| 2P***23 | Flywheel Clutch Group | 1 |
2p7223 Flywheel Clutch Group--Field Installation--Part 1 Of 4
| 2P***23 | Flywheel Clutch Group | 1 |
Front Idler--Part 1 Of 2
Front Idler--Part 2 Of 2
Fuel Tank
8h204 Fuel Tank Group
| 8H***04 | Fuel Tank Group | 1 |
Gear Shift And Flywheel Clutch Control--Front View--Part 1 Of 3
Gear Shift And Flywheel Clutch Control--Side View--Part 2 Of 3
Gear Shift And Flywheel Clutch Control--Top View--Part 3 Of 3
Hood And Dash (9h631 N/S)
| 9H***31 | Hood And Dash | 1 |
9h631 Hood And Dash Group
| 9H***31 | Hood And Dash | 1 |
9h722 Oil Filter Group
| 9H***22 | Oil Filter Group | 1 |
9f6654 Oil Pump Group
| 9F***54 | Oil Pump Group | 1 |
5m6701 Oil Pump Group
| 5M***01 | Oil Pump Group | 1 |
9h931 Oil Pump Group
| 9H***31 | Oil Pump Group | 1 |
1s6307 Protection Cover Group
| 1S***07 | Protection Cover Group | 1 |
2m8765 Relief Valve Group
| 2M***65 | Relief Valve Group | 1 |
Seat Cushions And Frame
Steering Clutch
Steering Clutch Hydraulic Control--Top View--Part 2 Of 2
Steering Clutch Hydraulic Control--Side View--Part 1 Of 2
9h5376 Steering Clutch Hydraulic Valve Group--Top View
| 9H***76 | Steering Clutch Hydraulic Valve Group | 1 |
7m3211 Steering Clutch Hydraulic Valve Group
| 7M***11 | Steering Clutch Hydraulic Valve Group | 1 |
3b136 Tool Box Group
| 3B***36 | Tool Box Group | 1 |
9h9415 Track Carrier Roller Group--4 Groups Required
| 9H***15 | Track Carrier Roller Group | 1 |
5m7819 Track Carrier Roller Group--4 Required
| 5M***19 | Track Carrier Roller Group | 1 |
9h1996 Track Group--24" Grouser Shoe--2 Groups Required
| 9H***96 | Track Group | 1 |
8m2643 Track Group--22" Grouser Shoe--2 Groups Required
| 8M***43 | Track Group | 1 |
8h6837 Track Group--22" Grouser Shoe--2 Required
| 8H***37 | Track Group | 1 |
9m4467 Track Group--22" Grouser Shoe--2 Groups Required
| 9M***67 | Track Group | 1 |
Track Roller Frame
Track Roller Frame (9h6492 N/S)
| 9H***92 | Track Roller Frame; Track Roller Frame Group | 1 |
Track Roller Frame Guard
9h6505 Track Roller Frame Guard Group
| 9H***05 | Track Roller Frame Guard Group | 1 |
9h6449 Track Roller Group--Single Flange--6 Groups Required
| 9H***49 | Track Roller Group | 1 |
9h6451 Track Roller Group--Double Flange--6 Required
| 9H***51 | Track Roller Group | 1 |
9h6449 Track Roller Group--Single Flange--6 Required
| 9H***49 | Track Roller Group | 1 |
9h6451 Track Roller Group--Double Flange--6 Groups Required
| 9H***51 | Track Roller Group | 1 |
8m380 Track Carrier Roller Group--4 Required
| 8M***80 | Track Roller Group-Carrier; Track Carrier Roller Group | 1 |
Transmission And Steering Clutch Oil System--Top View--Part 3 Of 3
Transmission And Steering Clutch Oil System--Part 3 Of 3
Transmission And Steering Clutch Oil System--Part 2 Of 3
Transmission And Steering Clutch Oil System--Side View--Part 2 Of 3
Transmission And Steering Clutch Oil System--End View--Part 1 Of 3
Transmission And Steering Clutch Oil System--Part 1 Of 3
9h6833 Transmission Group--Part 2 Of 2
| 9H***33 | Transmission Group | 1 |
9h6833 Transmission Group--Part 1 Of 2
| 9H***33 | Transmission Group | 1 |
9h5108 Universal Joint Assembly
| 9H***08 | Universal Joint Assembly | 1 |
Diesel Engine
1s8858 Accelerator Arrangement--Factory Installation
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 2 |
| 1S***29 | Plate Assembly-- Floor Plate | 1 |
| 1S***30 | Cover Assembly-- Floor | 1 |
1s8857 Accelerator Control Group--Field Installation
| 0S***70 | Cap Screw (5/8" Long) | 1 |
| 1L***65 | Lever-- Shaft To Spring Assembly | 1 |
| 1S***29 | Gasket-- Cover Assembly To Housing Assembly | 1 |
Accessory Drive And Governor--Part 1 Of 2
Accessory Drive And Governor--Part 2 Of 2
9h4567 Accessory Drive And Governor Group--Part 2 Of 2
| 9H***67 | Accessory Drive And Governor Group | 1 |
9h4567 Accessory Drive And Governor Group--Part 1 Of 2
| 9H***67 | Accessory Drive And Governor Group | 1 |
1s9857 Accessory Drive And Governor Group--Part 2 Of 2
| 1S***57 | Accessory Drive And Governor Group | 1 |
1s9857 Accessory Drive And Governor Group--Part 1 Of 2
| 1S***57 | Accessory Drive And Governor Group | 1 |
Air Cleaner
Air Cleaner (1m1696 N/S)
| 1M***96 | Air Cleaner Group | 1 |
1m1696 Air Cleaner Group
| 1M***96 | Air Cleaner Group | 1 |
Breather And Oil Filler
Camshaft (4h9649 N/S)
| 4H***49 | Camshaft Group | 1 |
9h4420 Compression Release Control Group
| 9H***20 | Compression Release Control Group | 1 |
Connecting Rod And Piston--6 Required
8h4645 Connecting Rod And Piston Group--6 Required
| 8H***45 | Connecting Rod And Piston Group | 1 |
9h5339 Fuel Pump And Governor Control Group
| 9H***39 | Control Group-Governor | 1 |
2s3025 Protection Cover Group--Oil Filler Cap
| 2S***25 | Cover Group-Protection; Protection Cover Group | 1 |
Crankshaft
Crankshaft Bearing Replacement
7h6755 Crankshaft Bearing Replacement Group
| 7H***55 | Crankshaft Bearing Replacement Group | 1 |
8m3477 Crankshaft Replacement Gear Group
| 8M***77 | Crankshaft Replacement Gear Group | 1 |
Cylinder Block And Covers--Side View--Part 1 Of 2
Cylinder Block And Covers--Front View--Part 2 Of 2
2m8101 Cylinder Block Assembly
| 2M***01 | Cylinder Block Assembly | 1 |
Cylinder Head And Valve Mechanism--Side View--Part 1 Of 2
Cylinder Head And Valve Mechanism--End View--Part 2 Of 2
Engine Support
Engine Support Group
Exhaust Extension
8h4681 Primary Fuel Filter Group
| 8H***81 | Filter Group-Primary Fuel; Primary Fuel Filter Group | 1 |
8h664 Fuel Filter Group
| 8H***64 | Fuel Filter Group | 1 |
Fuel Injection Valves And Lines
Fuel Lines
Fuel Pump And Governor Control
Fuel Pump Housing
5m8177 Fuel Pump Housing Group
| 5M***77 | Fuel Pump Housing Group | 1 |
8h4716 Fuel Pump Housing Group
| 8H***16 | Fuel Pump Housing Group | 1 |
5h2788 Fuel Transfer Pump Assembly
| 5H***88 | Fuel Transfer Pump Assembly | 1 |
5m7625 Fuel Transfer Pump Group
| 5M***25 | Fuel Transfer Pump Group | 1 |
9m3850 Governor And Accelerator Control Group
| 9M***50 | Governor And Accelerator Control Group; Governor And Accelerator Control Group Reverse Side This Insert | 1 |
2s1033 Governor And Accelerator Control Group
| 2S***33 | Governor And Accelerator Control Group; Governor And Accelerator Control Group Shown Below | 1 |
Manifolds
Oil Cooler
8h4973 Oil Filter Assembly
| 8H***73 | Oil Filter Assembly | 1 |
Oil Gauge, Fuel Gauge And Heat Indicator
9h1883 Oil Gauge, Fuel Gauge And Heat Indicator Group
| 9H***83 | Oil Gauge, Fuel Gauge And Heat Indicator Group | 1 |
Oil Lines And Filter--End View--Part 2 Of 3
Oil Lines And Filter--Side View--Part 1 Of 3
Oil Lines And Filter--End View--Part 3 Of 3
Oil Lines And Filter--Side View--Part 1 Of 2
Oil Lines And Filter--End View--Part 2 Of 2
4h8758 Oil Pump Assembly
| 4H***58 | Oil Pump Assembly | 1 |
4m359 Oil Pump Drive Group
| 4M***59 | Oil Pump Drive Group | 1 |
4m9112 Piston Assembly
| 4M***12 | Piston Assembly | 1 |
7s4327 Pressure Relief Valve Group
| 7S***27 | Pressure Relief Valve Group | 1 |
5s6849 Pressure Relief Valve Group
| 5S***49 | Pressure Relief Valve Group | 1 |
Primary Fuel Filter And Lines
Radiator--Side View--Part 1 Of 2
Radiator--Rear View--Part 2 Of 2
9m8879 Radiator Core Snubber Group--Field Installation
| 9M***79 | Radiator Core Snubber Group | 1 |
5m4254 Radiator Group--Rear View--Part 2 Of 2
| 5M***54 | Radiator Group | 1 |
5m4254 Radiator Group--Side View--Part 1 Of 2
| 5M***54 | Radiator Group | 1 |
4m9953 Radiator Group--Rear View--Part 2 Of 2
| 4M***53 | Radiator Group | 1 |
4m9953 Radiator Group--Side View--Part 1 Of 2
| 4M***53 | Radiator Group | 1 |
Radiator Guard
2s1161 Radiator Guard Hinge Group
| 2S***61 | Radiator Guard Hinge Group | 1 |
9h6248 Rear Power Take-Off Group
| 9H***48 | Rear Power Take-Off Drive Group; Power Take-Off Drive Group | 1 |
Rear Power Take-Off Housing
5m591 Rear Power Take-Off Housing Group
| 5M***91 | Rear Power Take-Off Housing Group | 1 |
9h5532 Rear Power Take-Off Housing Group
| 9H***32 | Rear Power Take-Off Housing Group | 1 |
8h5903 Service Meter Group
| 8H***03 | Service Meter Group | 1 |
Suction Fan And Drive
Transmission Oil Cooler (2m8190 N/S)
| 2M***90 | Transmission Oil Cooler | 1 |
Transmission Oil Cooler
2m5488 Turbocharger Assembly
| 2M***88 | Turbocharger Assembly | 1 |
3s8271 Or 3s2394 Turbocharger Assembly--Field Installation
| 3S***71 | Turbocharger Assembly | 1 |
7m7628 Turbocharger Oil System Group--Field Installation
| 7M***28 | Turbocharger Oil System Group | 1 |
Water Lines
8h4665 Water Lines Group
| 8H***65 | Water Lines Group | 1 |
2m6547 Water Lines Group
| 2M***47 | Water Lines Group | 1 |
9s2326 Water Pressure Gauge Group--Field Installation
| 9S***26 | Water Pressure Gauge Group | 1 |
2m7894 Water Pump Group
| 2M***94 | Water Pump Group | 1 |
Water Pump Idler Gear
Starting Engine
Battery And Wiring--12 Volt--Part 2 Of 2
Battery And Wiring--Part 2 Of 2--12 Volt
Battery And Wiring--12 Volt--Part 1 Of 2
Battery And Wiring--Part One--6 Volt
Battery And Wiring--Part Two--6 Volt
Battery And Wiring--Part 1 Of 2--12 Volt
Camshaft And Governor
9h6160 Camshaft And Governor Group
| 9H***60 | Camshaft And Governor Group | 1 |
9h6181 Carburetor Group
| 9H***81 | Carburetor Assembly | 1 |
7m6038 Carburetor Assembly
| 7M***38 | Carburetor Assembly | 1 |
9h3511 Choke And Throttle Control Group
| 9H***11 | Choke And Throttle Control Group | 1 |
7m7967 Choke And Throttle Control Group
| 7M***67 | Choke And Throttle Control Group | 1 |
9h3414 Clutch And Starter Pinion Control Group
| 9H***14 | Clutch And Starter Pinion Control Group | 1 |
5h6017 Clutch Group
| 5H***17 | Clutch Group | 1 |
9h4826 Clutch Group
| 9H***26 | Clutch Group | 1 |
7f2921 Switch Assembly
| 7F***21 | Combination Switch | 1 |
Connecting Rod And Piston (8f2738 N/S)--2 Required
| 8F***38 | Connecting Rod And Piston | 1 |
Crankshaft (9h6218 N/S)
| 9H***18 | Crankshaft | 1 |
Cylinder Block, Cylinder Head And Valve Mechanism--Part 2 Of 2
Cylinder Block, Cylinder Head And Valve Mechanism--Part 1 Of 2
7m7793 Electric Starter Group--12 Volt
| 7M***93 | Electric Starter Group | 1 |
6h4260 Electric Starting Group--6 Volt
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 2 |
| 3B***06 | Washer,Lock; Flange,Elbow,Clamp Assembly,Tube To Pump,Tube Assembly To Screen,Clip Mounting,And Tube Assembly To Transmission | 2 |
| 6H***60 | Electric Starter Group | 1 |
4m1320 Electric Starter Group--12 Volt
| 4M***20 | Electric Starter Group | 1 |
7h1604 Support Group
| 7H***04 | Engine Support Group | 1 |
9f6300 Flywheel Clutch Hydraulic Mechanism Control Group
| 9F***00 | Flywheel Clutch Hydraulic Mechanism Control Group | 1 |
9h4437 Fuel System Group
| 9H***37 | Fuel System Group; Starting Engine Fuel System | 1 |
8h5876 Generator--12 Volt, 24 Ampere
| 8H***76 | Generator | 1 |
8h5876 Generator Assembly--12 Volt, 24 Ampere
| 8H***76 | Generator | 1 |
7m2159 Generator Assembly--12 Volt, 24 Ampere
| 7M***59 | Generator Assembly | 1 |
2m6664 Generator--6 Volt, 40 Ampere
| 2M***64 | Generator Assembly | 1 |
7m149 Generator Assembly--12 Volt, 24 Ampere
| 7M***49 | Generator Assembly | 1 |
1s150 Generator Assembly--12 Volt, 24 Ampere
| 1S***50 | Generator Assembly | 1 |
1s1420 Generator Assembly--12 Volt, 24 Ampere
| 1S***20 | Generator Assembly | 1 |
5s8166 Generator Conversion Kit
| 5S***66 | Generator Conversion Kit | 1 |
4m419 Generator Group--12 Volt, 24 Ampere
| 4M***19 | Generator Group | 1 |
3s3638 Generator Group--12 Volt, 24 Ampere--Field Installation
| 3S***38 | Generator Group | 1 |
4m268 Generator Group--6 Volt, 40 Ampere
| 4M***68 | Generator Group | 1 |
5s3927 Generator Group--12 Volt, 24 Ampere--Field Installation
| 5S***27 | Generator Group | 1 |
9h6203 Ignition System Group
| 9H***03 | Ignition System Group | 1 |
4m2471 Lamp Assembly--12 Volt
| 4M***71 | Lamp Assembly | 1 |
9h6374 Magneto Assembly
| 9H***74 | Magneto Assembly | 1 |
8m9145 Magneto Assembly
| 8M***45 | Magneto Assembly | 1 |
7m4700 Magneto Assembly
| 7M***00 | Magneto Assembly | 1 |
5m6374 Magneto Assembly
| 5M***74 | Magneto Assembly | 1 |
5m2850 Magneto Assembly
| 5M***50 | Magneto Assembly | 1 |
9h6176 Manifold, Carburetor And Air Cleaner Group
| 9H***76 | Manifold, Carburetor And Air Cleaner Group | 1 |
7m7440 Manifold, Carburetor And Air Cleaner Group
| 7M***40 | Manifold, Carburetor And Air Cleaner Group | 1 |
Manual Crank
9h4699 Motor Assembly--6 Volt
| 9H***99 | Motor Assembly | 1 |
8h1543 Motor Assembly--12 Volt
| 8H***43 | Motor Assembly | 1 |
9h6165 Oil Line Group
| 9H***65 | Oil Line Group; Oil Lines Group | 1 |
2h7664 Oil Pump Assembly
| 2H***64 | Oil Pump Assembly | 1 |
8h5877 Regulator Assembly--12 Volt, 24 Ampere
| 8H***77 | Regulator Assembly | 1 |
8m8809 Regulator Assembly
| 8M***09 | Regulator Assembly | 1 |
7m3963 Regulator Assembly--12 Volt, 24 Ampere
| 7M***63 | Regulator Assembly | 1 |
9h6316 Regulator--6 Volt, 40 Ampere
| 9H***16 | Regulator Assembly | 1 |
7m5996 Separate Lubrication Conversion Group--Field Installation
| 7M***96 | Separate Lubrication Conversion Group | 1 |
7h7290 Switch Assembly
| 7H***90 | Switch As-Disconnect | 1 |
7h1603 Transmission And Starter Pinion Group--Part 2 Of 2
| 7H***03 | Transmission And Starter Pinion Group | 1 |
4m6262 Transmission And Starter Pinion Group--Part 2 Of 2
| 4M***62 | Transmission And Starter Pinion Group | 1 |
4m6262 Transmission And Starter Pinion Group--Part 1 Of 2
| 4M***62 | Transmission And Starter Pinion Group | 1 |
7h1603 Transmission And Starter Pinion Group--Part 1 Of 2
| 7H***03 | Transmission And Starter Pinion Group | 1 |
D8H serial number reference
The D8H predates Cat's modern 17-character PIN system, so there is no PIN plate as such. The serial number is stamped into the rear of the main frame on the left side, roughly mid-height - often hidden behind a mounted ripper or winch - and is repeated on a tag near the engine (left side of the block behind the pony motor, below the exhaust manifold) or on the lower right dash. The prefix (two digits plus a letter, e.g. 46A) identifies the drivetrain and manufacturing plant series; the digits that follow are the tractor's sequential build number within that series.
| Prefix | Identifies | Notes |
|---|---|---|
| 35A | D8H, USA-built, torque converter drive | Torque-converter sibling to the direct-drive 36A. Turbocharged D342 engine, initial rating around 225 hp (168 kW), raised to 235 hp (175 kW) at an early serial break circa 1961. Introduced late 1950s. Lowest-volume of the three USA-built D8H prefixes. |
| 36A | D8H, USA-built, direct drive | Turbocharged D342 engine. Started around 225 hp (168 kW) in 1958-59, stepped up to 235 hp (175 kW) at an early serial break circa 1961, then to 270-275 hp (201-205 kW) at a later break in the mid-1960s (reports vary on the exact final figure). Wider 84 in (2.13 m) gauge, solid equalizer bar, and hydraulically actuated steering clutches versus the pre-H D8 series. |
| 46A | D8H, USA-built, powershift transmission | Three-speed forward/reverse powershift drivetrain, factory Caterpillar unit. Same turbocharged D342 engine and horsepower progression as 36A, topping out at 270-275 hp (201-205 kW) by the mid-1960s (reports vary on the exact final figure). Introduced 1959. By far the highest-volume D8H prefix - most surviving D8H tractors are 46A-series. |
| 22A | D8H, UK-built (Birtley plant), direct drive | British-built counterpart to the USA 36A, added once demand justified production outside North America. Turbocharged D342 engine, following the same 225 to 235 to 270-275 hp (168 to 175 to 201-205 kW) progression as the USA-built direct-drive tractors (final figure varies by source). |
| 52A | D8H, UK-built (Birtley plant), torque converter drive | British-built counterpart to the USA 35A. Very low production - among the scarcest D8H prefixes; exact build total is inconsistent across sources, confirm with dealer/records. One source indicates this prefix stayed at the 235 hp (175 kW) rating and did not receive the later power increase seen on the direct-drive and powershift variants; single-sourced, treat as unconfirmed. |
| 68A | D8H, UK-built (Birtley plant), powershift transmission | British-built counterpart to the USA 46A powershift tractor. Turbocharged D342 engine, following the same progression up to 270-275 hp (201-205 kW) by the mid-1960s (final figure varies by source). Became the most common UK-built D8H variant. |
Frequently asked questions
What engine powers the Caterpillar D8H?
The D8H runs Caterpillar's D342 diesel in its turbocharged D342T form, an engine family developed specifically for the D8 line and not used in other Caterpillar machines. Flywheel output started at 168 kW (225 hp) in 1958 and was raised in stages over the production run, reaching roughly 201-209 kW (270-280 hp) by the early 1970s. It's a purely mechanical engine, with mechanical fuel injection and no electronic engine controls.
What is the operating weight of the Caterpillar D8H?
It varies by series and equipment. Lighter early direct-drive and torque-converter machines ran around 18.6-21.3 t (41,000-47,000 lb). Later production fitted with a dozer blade and rear ripper commonly reached about 31-32 t (68,000-71,000 lb), and some heavily optioned late units with a winch and canopy have been reported close to 36 t (79,000 lb). Confirm the figure against the specific series and attachments before ordering parts.
What replaced the Caterpillar D8H?
The D8K replaced the D8H in 1974, after roughly 16 years of production across direct-drive, torque-converter, and powershift configurations. The D8K brought higher rated output and updated running gear as Caterpillar answered growing competition from Japanese crawler-tractor builders. The D8K itself was later succeeded by the D8L in 1982.
What D8H owners discuss
What engine does the D8H run, and how much power did it actually make?
Every D8H used the turbocharged Cat D342T, a 20.4-liter (1,246 cu in) inline six. The naturally aspirated D342 belongs to the direct predecessor (D8D/D8E), not the D8H itself. Flywheel output climbed through the production run: about 168 kW (225 hp) at launch in 1958, up to 175 kW (235 hp) by 1961, and roughly 201-205 kW (270-275 hp) on late-production direct-drive and powershift units by the mid-to-late 1960s. These figures vary by series and year, so match the rating to the machine's own serial prefix rather than a general spec sheet. The trade-off for chasing more power out of this block was cylinder liner movement: at hotter tunes, a liner could settle or shift in a worn counterbore and let combustion or coolant pressure into places it shouldn't, showing up as head gasket failure or a pressurized cooling system. Cat answered this late in the engine's life with a spacer-plate version of the block, which was about the practical ceiling for this design. A worn or sticking throttle linkage (the friction spring/roller pack on the cross shaft under the back head) is a separate, common complaint: it lets the throttle creep back up on deceleration instead of holding position.
Which transmission and steering setups did the D8H come in, and does it matter to a buyer or operator?
The D8H came in three drivetrain configurations, and the serial prefix tells you which one you have: torque converter drive, direct drive (steered with dry-plate clutches and external contracting brake bands), and powershift, added about a year after launch and eventually the most common of the three by a wide margin. Steering clutches on the direct-drive and powershift machines are not field-adjustable; only the external brake bands are, using adjusters under covers at the rear of the machine. Worn bands show up as excess pedal travel even with the adjuster run in as far as it goes. A clutch that won't release cleanly is usually a dry-housing sticking issue rather than a worn friction disc. Because the steering brakes also serve as the parking/emergency brake on this machine, have your dealer or a qualified tech verify band condition and adjustment before relying on them.
What powershift and torque-converter problems come up most often in the field?
The most common complaint is the transmission slipping out of gear or refusing to hold a range at low engine speed. A healthy transmission pump should hold roughly 2070-2410 kPa (300-350 psi) in neutral; once pressure sags toward about 690 kPa (100 psi), a safety valve intentionally dumps the transmission back to neutral, which is what the operator feels as it kicking out. In the field this has been traced to the transmission pump mounted on the torque converter housing wearing internally (scored gears, worn bushings) well before the main hydraulic pump itself is at fault. Different serial ranges used different pump and valve hardware, so troubleshooting against the wrong manual for that range wastes time chasing seals and o-rings that were never the real problem. A separate and less common failure is a torque converter scavenge pump giving out, which lets the converter housing flood with oil, stalls the converter, and can kill the engine.
What hydraulic gremlins show up on the blade lift, tilt, and angle circuits?
Blade problems usually trace to one of two places: a cylinder or the control valve. Lift cylinders on this class of machine are plumbed in parallel, so a bad rod seal in just one cylinder is enough to keep the blade from holding position or from raising fully, even though the other cylinder tests fine. A practical field check is to isolate the lift circuit against a blanked line and see if the engine bogs down trying to build pressure; bogging points to a leaking cylinder, no bog points to the control valve, a relief valve, or (on machines fitted with one) a quick-drop/dump spool. Drift on lowering the blade is more often caused by a worn rod seal than the piston seal most people suspect first.
What undercarriage wear patterns are typical on a D8H, and how do owners get more life out of it?
Bushing wear shows up long before it's visible from the top of the machine, so measuring pin-to-pin stretch across several links, plus checking roller condition on the bottom side, is the first real test of undercarriage health rather than a walk-around look. Once the chain has stretched enough to lose correct pitch with the sprocket, wear accelerates on both ends: the chain no longer indexes evenly across the sprocket teeth, and load concentrates on whichever tooth is doing the work instead of spreading across all of them. Turning pins and bushings, and replacing sprocket segments at the same time, used to be standard practice for stretching total undercarriage life, though with cheaper aftermarket chain available now, some shops question whether the labor still pays for itself compared to running the set out. One operator habit worth noting: avoiding sustained work in the transmission's highest range (blocked out on machines set up for it) is reported to noticeably extend undercarriage life, since more of the load is absorbed by controlled track slip instead of full power straight to the ground.
What period-correct electrical and starting quirks should a D8H owner expect?
The D8H started life exclusively with a gasoline pony motor. Direct electric start on the main engine only became a factory-standard option late in the production run. Pony motors on these machines are notorious for flooding. The standard fix is opening the fuel petcocks and running the choke wide open while cranking to clear it; pulling the main engine over with the compression-release lever open confirms whether raw fuel is even reaching the cylinders. Main charging is handled by a DC generator and an external regulator. The recurring complaint is a regulator that won't fully cut in, from weak or burnt cutout contacts or worn generator brushes, which leaves the battery undercharged even though the generator itself tests fine off the machine. One period-correct gotcha: after disconnecting a battery, generator, or regulator, the generator needs to be re-polarized before the next start, or it can burn itself out on reconnection. Because this is a 24V starting and charging system with no electronic safeguards behind it, have your dealer or a qualified electrical tech verify wiring and regulator condition rather than chasing a no-charge complaint by trial and error.
What should you check before buying a used D8H?
Start with the serial prefix. It tells you which transmission and steering package the machine actually has and roughly which engine tune to expect, which matters more on this model than the bare D8H badge alone. From there, check the engine for any history of head gasket failure or a pressurized cooling system, both classic symptoms of the cylinder liner movement that shows up on hotter-tuned late-production units. Pressure-test the transmission and torque converter circuits against the manual for that specific serial range rather than a generic D8H manual, since pump and valve hardware changed over the production run. Check steering brake band adjustment and pedal travel, and confirm the bands are not already run out of adjustment. Measure undercarriage wear across several pins rather than eyeballing one link, and check sprocket tooth wear for signs the chain has already stretched past usable pitch. Cycle the blade through full lift, tilt, and lower travel and watch for drift or hesitation. Confirm whether it still starts on the original pony motor or was converted to electric start, and ask how the machine was used, since heavy ripping and heavy dozing load the undercarriage and transmission differently and that history predicts what needs replacing first. Because the steering brakes double as the parking brake on this machine, have your dealer or a qualified tech verify brake and steering clutch condition before putting it to work.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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