Caterpillarwheel-type skidderwheel skidder
Caterpillar 508
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 508 is a wheel-type log skidder built in cable and grapple configurations for small-to-mid-scale forestry work. Both versions share a Cat 3204 inline four-cylinder diesel, mechanically injected with no electronic engine controller, rated around 70.8 kW (95 hp) gross, driving through a Funk-built powershift transmission with three forward gears. Operating weight runs about 7,770 kg (17,130 lb) for the cable skidder with its bare-drum winch (max line pull near 9,590 kg / 21,137 lb), up to about 8,767 kg (19,326 lb) for the grapple skidder. Both ride on oscillating tandem axles (15 degrees of oscillation) and 23.1-26 tires, and carry a 161 L (42.6 US gal) fuel tank. Cat parts records show two production serial blocks, 2HD (grapple line) and 9NC (cable line), both placed around the mid-1980s; documented used-market listings for the 508 run from the mid-to-late 1980s. No documented predecessor or successor model ties directly to the 508 in available Cat records.
Cat's own parts catalog shows no 508B or 508C revision. The 2HD and 9NC serial blocks read as parallel production runs for the two configurations rather than distinct generations, so this model did not evolve through series changes the way many Cat machines did. What changed buyer to buyer was mainly configuration choice: cable-and-blade for straight skidding, or grapple-and-boom for faster hookup on smaller timber. In today's used and parts market the 508 holds a niche among small logging outfits and woodlot owners who want a simple, mechanically injected diesel and a conventional powershift transmission with no electronics to complicate a repair. Its age narrows OEM parts support, pushing owners toward rebuilds, salvage machines, and aftermarket cross-reference parts to keep the engine, transmission, and winch in service.
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 508 specifications
Engine
| Engine model | Cat 3204, inline 4-cylinder diesel |
| Gross power | 70.8 kW (95 hp) |
| Displacement | 5.2 L (317 cu in) per equipment spec listings for this model; the 3204 engine family is more commonly documented elsewhere at 4.4 L (269 cu in) — figure not fully reconciled across sources, verify against the engine serial plate |
| Net power | Not published in available spec listings |
| Emissions tier | Not documented — mechanically governed diesel of an era that predates emissions-tier regulation |
Weights
| Operating weight, cable configuration | 7,770 kg (17,130 lb) |
| Operating weight, grapple configuration | 8,767 kg (19,326 lb) |
| Shipping weight | Not published |
| Ground pressure | Not published |
Dimensions
| Overall length, cable configuration | 5.36 m (17.58 ft) |
| Overall length, grapple configuration | approx. 7.02 m (23.02 ft) — grapple arm adds to the cable-version length; treat as approximate |
| Overall width | 2.69 m (8.83 ft), both configurations |
| Height to top of cab | 2.87 m (9.42 ft), both configurations |
| Ground clearance | 0.52 m (1.71 ft), both configurations |
| Wheelbase | 2.80 m (9.19 ft), both configurations |
| Tire size | 23.1-26 |
| Dozer blade width (cable configuration) | 2.10 m (6.89 ft) |
Performance
| Forward gears | 3 |
| Max travel speed, forward | 25.7 km/h (16 mph) |
| Winch max line pull, bare drum | 9,587 kg (21,137 lb) |
| Winch max line speed | 78.0 m/min (255.9 ft/min) |
| Winch drum diameter | 228 mm (8.98 in) |
| Gradeability / drawbar pull | Not published in available spec listings |
Service capacities (summary)
| Fuel tank | 161.3 L (42.6 gal), both configurations |
| Hydraulic system | 26.1 L (6.9 gal), both configurations |
| Engine oil | Not published for this specific model — check the engine serial-range service manual |
| Cooling system | Not published for this specific model — check the engine serial-range service manual |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
508 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) - Cat 3204 diesel | Not published for the 508 specifically in available sources. The 3204 engine (used across many Cat truck and equipment applications) generally runs about 9.5-19 L (2.5-5 US gal) with filter depending on sump/pan configuration - confirm against the 508 OMM or a dealer before service. | Cat Diesel Engine Oil (Cat DEO). SAE 15W-40 for temperate ambient, SAE 10W-30 where cold starts are expected. |
| Cooling system | Not documented in available sources for this machine. | Cat antifreeze/coolant, full-strength or 50/50 mix by ambient temperature, with corrosion inhibitor maintained per Cat's cooling system service guidance for this engine era. |
| Fuel tank | 161 L (42.6 US gal) | No. 2-D diesel fuel per Cat fuel spec. Winterized/low-temperature blend recommended in cold climates to prevent fuel gelling. |
| Powertrain / transmission compartment | 26.1 L (6.9 US gal) per some spec sheets - other sources apply this same figure to the hydraulic system instead, so the system assignment is not fully settled. Treat as a combined transmission/hydraulic reservoir range until checked against the 508 OMM by serial prefix. | Cat Transmission/Drive Train Oil (Cat TDTO). SAE 10W in cold climates, SAE 30W in warm climates. |
| Hydraulic system (implement/steering circuit) | 26.1 L (6.9 US gal) - same figure reported for the transmission compartment by other sources; not independently confirmed as hydraulic-only. | Cat Hydraulic Oil suited to this machine class; on this era of forestry equipment the hydraulic and powershift circuits commonly share a TDTO-type fluid. Viscosity grade selected by ambient temperature. |
| Final drives (each) | Not documented in available sources for this machine. | Cat Final Drive Axle Oil (Cat FDAO) or equivalent GL-5 gear oil, viscosity graded by ambient temperature. |
| Axles / differentials | Not documented in available sources for this machine. | Cat differential/axle gear oil, GL-5 type, viscosity graded by ambient temperature. |
| Grease (chassis, pins, bushings) | Spec only - no fill quantity applicable. | Cat Multipurpose Grease (Cat MPGM), NLGI 2 general-purpose grease for standard temperatures; cold-climate/arctic grade for sub-freezing operation. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 508 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the 508 beyond the schedule
Predictive maintenance & fluid analysis
Run oil analysis on the 3204 crankcase, Funk transmission, and axle housings at every 250-hour service; logging debris and dust load these fluids faster than typical earthmoving duty. Watch for metal fines signaling worn transmission clutch packs or axle bearings before outright failure. Log winch wire rope wear and drum brake band thickness over time, since bare-drum cable skidding wears rope faster than owners expect. Fuel filter debris checks also flag mechanical injection pump wear early, before it shows up as hard starting.
Corrective & common repairs
Common 508 complaints include fuel starvation on steep grades from a corroded fuel pickup tube inside the tank, and forward-gear slip or transmission overheating traced to a worn Funk charge pump or failing seals. Output shaft seal leaks on the transmission are known but awkward to reach. Bare-drum winch owners report brake band and clutch wear from repeated hot-line pulls under full load. Grapple-arm bushings and pivot pins take side-load wear the cable version never sees, so inspect those separately.
Overhaul & rebuild points
Rebuild priorities on a high-hour 508: Funk transmission clutch packs and charge pump, articulation hitch and king pin bushings worn from constant frame flex under skidding loads, and winch drum bearings plus brake band relining after repeated hot pulls. The 3204's mechanical injection pump benefits from bench calibration at major overhaul rather than field guesswork. Final drive gear sets and axle housings deserve inspection alongside the transmission teardown, since both carry the same drawbar-load duty cycle.
Seasonal & environment servicing
Cold starts on the mechanically injected 3204 call for a lighter-viscosity Funk transmission and hydraulic oil grade (SAE 10W versus a warm-weather 30W) and a winterized diesel blend to prevent gelling. Clear the radiator and screen guard of mud, bark, and needles each shift in wet ground conditions, since logging debris chokes airflow faster than open-field duty. Check axle and final-drive seals after deep mud or water crossings for intrusion. In dry, dusty seasons, shorten air filter service intervals well below the standard 250-hour mark.
508 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 6V-7615 | Film-Identification-On Fuel Filter | Fuel system service | Check fitment → |
| 8T-5913 | Screen-Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
508 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Coolant Temperature warning lamp (red segment/gauge) | Engine coolant temperature has reached or exceeded the safe operating range | Low coolant level, plugged radiator core, slipping or broken fan belt, faulty water pump, or heavy sustained load on a hot day | Stop the machine, let the engine idle cool down, check coolant level and radiator fins for debris before restarting |
| Engine Oil Pressure warning lamp | Engine oil pressure has dropped below the safe minimum | Low oil level, worn oil pump, clogged oil filter, or worn main/rod bearings | Shut the engine down immediately, check oil level and filter condition, do not restart until the cause is found |
| Alternator/Charging System warning lamp | Charging circuit is not producing correct voltage to the battery | Loose or worn drive belt, failed alternator, bad voltage regulator, or a loose/corroded battery connection | Check belt tension and battery terminals first, then test alternator output |
| Hydrostatic Transmission Oil Temperature gauge/lamp | Hydrostatic drive oil is running hotter than normal operating range | Low transmission fluid level, worn pump or motor swash plate reducing hydraulic efficiency, clogged oil cooler, or degraded fluid | Stop and let the system cool, check fluid level and cooler for blockage, sample fluid condition before continued operation |
| Air Filter Restriction indicator | Intake air filter element is loaded to the point of restricting airflow | Dirty or clogged air filter element | Service or replace the air filter element and reset the indicator |
| Parking/Service Brake system warning lamp | Brake hydraulic system pressure is low or the parking brake is still applied | Low brake system hydraulic pressure, worn brake components, or parking brake left engaged | Confirm parking brake release and check brake system hydraulic pressure before moving the machine |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
508 attachments & work tools
Integral tree grapple (boom/arch-mounted)
Standard work tool on the grapple-skidder configuration. Box-section tongs open to about 1.93 m (6.34 ft) tip-to-tip, with grapple capacity figures for this class running roughly 0.78-0.84 sq m (8.4-9 sq ft), varies by source. Grapple is fixed to the machine's own arch and boom, not a quick-coupler tool, and draws on the machine's built-in rotation/clamp hydraulic circuit rather than an add-on kit.
Integral cable winch (bare drum)
Cable-skidder version of this class carries a rear-mounted bare-drum winch rated about 9,590 kg (21,137 lb) max line pull at up to roughly 78 m/min (256 ft/min) line speed. Drum diameter runs about 22.8 cm (8.98 in) for 16 mm (0.63 in) cable. Winch is driven off the machine's own transmission/hydraulic circuit, not a bolt-on hydraulic kit.
Chokers / cable rigging
Cable-skidder configuration pulls logs with chokers run off the winch line instead of a grapple. Same arch and fairlead hardware as the grapple version carries the cable to the load.
Clearing/pusher blade
Factory front blade option, about 2.1 m (6.89 ft) wide, documented on both the grapple and cable-skidder spec sheets for this class. Used mainly for trail clearing, site prep and self-recovery rather than as a dozing tool.
Arch and fairlead mounting (fixed, non quick-coupler)
Grapple, boom and cable all mount through the machine's own arch structure rather than a universal quick-coupler. Arch gate carries a bolt-on fairlead-roller assembly on winch-equipped units, or a bolt-on guard plate in place of the fairlead on grapple-only units without a winch.
Open ROPS canopy and guarding
Units of this class are commonly built with an open ROPS/FOPS canopy; used-equipment listings for this model repeatedly show the open-canopy arrangement. Canopy screens over the rear, sides and doors are the typical factory guarding option on this skidder class to protect the operator from limbs and debris during grapple and winch work, varies by configuration and production year.
All 508 assemblies by section
Every catalogued assembly group for the Caterpillar 508. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
7e5374 Air Cleaner Gp
| 7E***74 | Air Cleaner Group | 1 |
1w5855 Air Cleaner Gp-Engine
| 1W***55 | Air Cleaner Group | 1 |
8n4780 Cartridge Gp-Turbocharger*R
| 8N***80 | Cartridge Group-Turbocharger | 1 |
9c5200 Guard Gp-Precleaner
| 9C***00 | Guard Group-Precleaner | 1 |
1w5859 Lines Gp-Air
| 1W***59 | Lines Group-Air | 1 |
4w5025 Lines Gp-Engine Air
| 4W***25 | Lines Group-Engine Air | 1 |
8n3131 Lines Gp-Turbocharger Oil
| 8N***31 | Lines Group-Turbocharger Oil; Turbocharger Oil Lines Group | 1 |
6n6085 Manifold Gp-Exhaust
| 6N***85 | Manifold Group-Exhaust; Exhaust Manifold Group | 1 |
1w5860 Muffler Gp
| 1W***60 | Muffler Group | 1 |
8n4774 Turbocharger Gp
| 8N***74 | Turbocharger Group | 1 |
6n5079 Turbocharger Gp
| 6N***79 | Turbocharger Group; Turbocharger Group | 1 |
Basic Engine
2w1337 Camshaft Gp
| 2W***37 | Camshaft Group-Single; Single Camshaft Group | 1 |
1w1352 Cover Gp-Valve Mechanism
| 1W***52 | Cover Group-Valve Mechanism; Valve Mechanism Cover Group | 1 |
7w6273 Crankshaft Gp
| 7W***73 | Crankshaft Group | 1 |
1w9768 Crankshaft Gp
| 1W***68 | Crankshaft Group; Crankshaft Group | 1 |
7n4821 Cylinder Block As
| 7N***21 | Cylinder Block As | 1 |
6n9049 Cylinder Block Gp
| 6N***49 | Cylinder Block Group; Cylinder Block Group | 1 |
7w9391 Cylinder Head As
| 7W***91 | Cylinder Head As | 1 |
7c2320 Cylinder Head As *R
| 7C***20 | Cylinder Head As | 1 |
7w9394 Cylinder Head Gp*R
| 7W***94 | Cylinder Head Group | 1 |
6n2397 Cylinder Head Gp*R
| 6N***97 | Cylinder Head Group; Cylinder Head Group | 1 |
1w7459 Drive Gp-Water Pump
| 1W***59 | Drive Group-Water Pump | 1 |
1w5856 Flywheel Gp
| 1W***56 | Flywheel Group | 1 |
1w1355 Gear Gp-Engine Front
| 1W***55 | Gear Group-Front; Front Gear Group | 1 |
4w9075 Housing Gp-Flywheel
| 4W***75 | Housing Group-Flywheel | 1 |
2w4384 Housing Gp-Front
| 2W***84 | Housing Group-Front; Front Housing Group | 1 |
2w1678 Lifting Eye Gp-Engine
| 2W***78 | Lifting Group; Lifting Eye Gp-Engine | 1 |
7w9029 Pan Gp-Engine Oil
| 7W***29 | Pan Group-Oil; Pan Gp-Engine Oil | 1 |
2w1040 Rod & Piston Gp-4 Required
| 2W***40 | Piston & Rod Group; Connecting Rod And Piston Group | 1 |
2w4841 Piston Gp
| 2W***41 | Piston Group | 1 |
1w5861 Pulley Gp-Auxiliary Drive
| 1W***61 | Pulley Group-Auxiliary Drive | 1 |
4w9842 Support Gp-Engine
| 4W***42 | Support Group-Engine | 1 |
1w5720 Valve Mechanism Gp
| 1W***20 | Valve Mechanism Group; Valve Mechanism Group | 1 |
Cab, Gauges And Accessories
8v9096 Compartment Gp-Literature
| 8V***96 | Compartment Group-Literature | 1 |
6w2519 Cushion As-Arm
| 6W***19 | Cushion As-Arm | 1 |
6w2520 Cushion As-Arm
| 6W***20 | Cushion As-Arm | 1 |
9v1676 Door Gp-Lh
| 9V***76 | Door Group-Lh; Door Gp-L.H | 1 |
9v1676 Door Gp-L.H.
| 9V***76 | Door Group-Lh; Door Gp-L.H | 1 |
9v1675 Door Gp-Rh
| 9V***75 | Door Group-Rh; Door Gp-R.H | 1 |
9v1675 Door Gp-R.H.
| 9V***75 | Door Group-Rh; Door Gp-R.H | 1 |
9v1674 Enclosure Ar
| 9V***74 | Enclosure Ar | 1 |
| 9V***75 | Door Group-Rh; Door Gp-R.H | 1 |
| 9V***76 | Door Group-Lh; Door Gp-L.H | 1 |
9c7745 Enclosure Ar-Cab
| 9C***32 | Panel Group-Cab | 1 |
| 9C***45 | Enclosure Ar-Cab | 1 |
| 9V***75 | Door Group-Rh; Door Gp-R.H | 1 |
9c1642 Fan Gp-Circulating
| 9C***42 | Fan Group-Circulating | 1 |
5d2856 Fan Gp-Defroster
| 5D***56 | Fan Group-Defrosting | 1 |
9v1709 Fan Gp-Defrosting
| 9V***09 | Fan Group-Defrosting | 1 |
9c4151 Heater Gp-Cab-Part 2 Of 2
| 9C***51 | Heater Group-Cab | 1 |
9c5891 Heater Gp-Cab-Part 1 Of 2
| 9C***91 | Heater Group-Cab | 1 |
9c4151 Heater Gp-Cab-Part 1 Of 2
| 9C***51 | Heater Group-Cab | 1 |
9c5891 Heater Gp-Cab-Part 2 Of 2
| 9C***91 | Heater Group-Cab | 1 |
9v1677 Heater Gp-Cab-Part 2 Of 2
| 9V***77 | Heater Group-Cab | 1 |
9v1677 Heater Gp-Cab-Part 1 Of 2
| 9V***77 | Heater Group-Cab | 1 |
8v2249 Horn Gp-Electric
| 8V***49 | Horn Group-Electric | 1 |
9c0540 Mirror Gp-Rear View
| 9C***40 | Mirror Group-Rear View | 1 |
8v2254 Module Gp-Operator-Part 2 Of 2
| 8V***54 | Module Group-Operator | 1 |
8v2254 Module Gp-Operator-Part 1 Of 2
| 8V***54 | Module Group-Operator | 1 |
9v1678 Panel Gp-Cab
| 9V***78 | Panel Group-Cab | 1 |
9c7732 Panel Gp-Cab
| 9C***32 | Panel Group-Cab | 1 |
6w1549 Panel Gp-Instrument
| 6W***49 | Panel Group-Instrument | 1 |
9v1682 Protection Gp-Vandalism
| 9V***82 | Protection Group-Vandalism | 1 |
9v1683 Screen Ar-Door
| 9V***75 | Door Group-Rh; Door Gp-R.H | 1 |
| 9V***76 | Door Group-Lh; Door Gp-L.H | 1 |
| 9V***83 | Screen Ar-Door | 1 |
6w6599 Screen Gp-Protective
| 6W***99 | Screen Group-Protective | 1 |
9v1684 Screen Gp-Protective Door
| 9V***84 | Screen Group-Protective; Screen Gp-Protective Door | 1 |
8y4037 Seat Belt Gp
| 8Y***37 | Seat Belt Group | 1 |
9c7773 Seat Gp
| 9C***73 | Seat Group | 1 |
9v8787 Seat Gp
| 9V***87 | Seat Group | 1 |
8v2256 Seat Gp-Adjustable
| 8V***56 | Seat Group-Adjustable | 1 |
7v2319 Seat Gp-Suspension
| 7V***19 | Seat Group-Suspension | 1 |
9c2774 Seat Gp-Suspension
| 9C***74 | Seat Group-Suspension | 1 |
9c3696 Seat Gp
| 9C***96 | Seat Group-Suspension | 1 |
| 9C***61 | Suspension Group-Seat | 1 |
| 9C***73 | Seat Group | 1 |
8r2122 Service Gp-Cab
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 4V***04 | Hinge As | 1 |
| 4V***05 | Hinge-Half; (Half) | 1 |
9v1692 Suppression Gp-Fire
| 9V***92 | Suppression Group-Fire | 1 |
9c3630 Suppression Gp-Sound
| 9C***30 | Suppression Group-Sound | 1 |
2v7961 Suspension Gp-Seat
| 2V***61 | Suspension As-Seat | 1 |
9c7161 Suspension Gp-Seat-Part 2 Of 2
| 9C***61 | Suspension Group-Seat | 1 |
9c7161 Suspension Gp-Seat-Part 1 Of 2
| 9C***61 | Suspension Group-Seat | 1 |
9v1690 Warning Gp-Operator
| 9V***90 | Warning Group-Operator | 1 |
6w9972 Washer Gp-Windshield
| 5C***40 | Reservoir | 1 |
| 5C***41 | Support As | 1 |
| 6W***72 | Washer Group-Window | 1 |
9c7733 Window Gp
| 9C***33 | Window Group | 1 |
9v1679 Wiper & Washer Gp-Part 1 Of 2
| 9V***79 | Wiper & Washer Group | 1 |
9v1679 Wiper & Washer Gp-Part 2 Of 2
| 9V***79 | Wiper & Washer Group | 1 |
3t7062 Wiper Gp
| 3T***62 | Wiper Group-Window; -Rear | 1 |
Chassis
9c3223 Counterweight Gp-Front
| 9C***23 | Counterweight Group-Front | 1 |
9c5546 Cover Gp-Miscellaneous
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 5P***75 | Washer-Hard; (10.2x22.5x3-mm Thk)(Shield To A/C) | 2 |
| 9C***46 | Cover Group-Miscellaneous | 1 |
8v2241 Frame Gp-Engine End
| 8V***41 | Frame Group-Engine End | 1 |
8v2283 Frame Gp-Grapple
| 8V***83 | Frame Group-Grapple | 1 |
8v2277 Frame Gp-Non Engine End
| 8V***77 | Frame Group-Non-Engine End | 1 |
8r8080 Frame Gp-Non-Engine End
| 8R***80 | Frame Group-Non-Engine End | 1 |
8v2242 Frame Gp-Non Engine End
| 8V***42 | Frame Group-Non-Engine End | 1 |
9c3690 Guard Gp-Driveshaft
| 9C***90 | Guard Group-Drive Shaft | 1 |
9v2537 Guard Gp-Dozer Lines
| 9V***37 | Guard Group-Lines | 1 |
8v2284 Guard Gp-Grapple Lines
| 8V***84 | Guard Group-Lines | 1 |
8v2246 Guard Gp-Radiator
| 8V***46 | Guard Group-Radiator | 1 |
8v2274 Guard Gp-Winch
| 8V***74 | Guard Group-Winch | 1 |
8v2247 Hitch Gp-Articulated
| 8V***47 | Hitch Group-Articulated | 1 |
8v2248 Hood & Guard Gp-Part 2 Of 2
| 8V***48 | Hood & Guard Group | 1 |
8v2248 Hood & Guard Gp-Part 1 Of 2
| 8V***48 | Hood & Guard Group | 1 |
8v2253 Link Gp-Frame Lock
| 8V***53 | Link Group-Frame Lock | 1 |
8v2255 Mounting Gp-Rops
| 8V***55 | Mounting Group-Rops | 1 |
8v2258 Sweep Gp
| 8V***58 | Sweep Group | 1 |
8v2348 Swivel & Rotator Gp-Grapple-Type 1
| 8V***48 | Swivel & Rotator Group | 1 |
8v2348 Swivel & Rotator Gp-Grapple-Type 2
| 8V***48 | Swivel & Rotator Group | 1 |
8v2348 Swivel & Rotator Gp-Grapple
| 8V***48 | Swivel & Rotator Group | 1 |
Cooling System
9n5659 Cooler Gp-Engine Oil
| 9N***59 | Cooler Group-Engine Oil | 1 |
4w9237 Cooler Gp-Engine Oil
| 4W***37 | Cooler Group-Engine Oil | 1 |
1w5858 Fan Gp-Blower
| 1W***58 | Fan Group-Blower | 1 |
4w9238 Fan Gp-Suction
| 4W***38 | Fan Group-Suction | 1 |
4w9240 Lines Gp-Water
| 4W***40 | Lines Group-Water | 1 |
4n0660 Pump Gp-Water
| 4N***60 | Pump Group-Water; Water Pump Group | 1 |
7e5297 Radiator Gp
| 7E***97 | Radiator Group; Radiator Gp (Bsc) | 1 |
1w5862 Radiator Gp
| 1W***62 | Radiator Group | 1 |
4p5193 Radiator Gp
| 4P***93 | Radiator Group; Radiator Gp (Bsc) | 1 |
4w8922 Radiator Gp-Folded Core
| 4W***22 | Radiator Group | 1 |
4e2234 Service Gp
| 2M***80 | Seal--To Connector Pump Outlet | 2 |
| 4E***39 | Tube As. | 1 |
| 4E***40 | Tube As. | 1 |
Engine Arrangement
1w5853 Engine Ar-Part 2 Of 2
| 1W***20 | Valve Mechanism Group; Valve Mechanism Group | 1 |
| 1W***53 | Engine Ar | 1 |
| 1W***61 | Pulley Group-Auxiliary Drive | 1 |
1w5853 Engine Ar-Part 1 Of 2
| 1W***52 | Cover Group-Valve Mechanism; Valve Mechanism Cover Group | 1 |
| 1W***54 | Lines Group-Fuel Injection; Fuel Injection Lines Group | 1 |
| 1W***55 | Gear Group-Front; Front Gear Group | 1 |
Fuel System And Governor
8v2235 Control Gp-Governor
| 8V***35 | Control Group-Governor | 1 |
1w2481 Cover Gp-Tachometer Drive
| 1W***81 | Cover Group-Tachometer Drive; Tachometer Drive Cover Group | 1 |
7c0162 Governor & Fuel Injection Pump Gp
| 7C***62 | Gov & Fuel Inj Pump Group; Governor & Fuel Injection Pump Gp | 1 |
1w8730 Governor Gp-Part 3 Of 3
| 1W***30 | Governor Group | 1 |
1w8730 Governor Gp-Part 1 Of 3
| 1W***30 | Governor Group | 1 |
1w8730 Governor Gp-Part 2 Of 3
| 1W***30 | Governor Group | 1 |
1w5867 Lines & Fuel Filter Gp
| 1W***67 | Lines & Fuel Filter Group; Fuel Filter And Lines Group | 1 |
8v2251 Lines & Filter Gp-Fuel
| 8V***51 | Lines Group-Fuel | 1 |
8v2251 Lines Gp-Fuel Oil
| 8V***51 | Lines Group-Fuel | 1 |
7n0042 Lines Gp-Fuel Injection
| 7N***42 | Lines Group-Fuel Injection | 1 |
1w1354 Lines Gp-Fuel Injection
| 1W***54 | Lines Group-Fuel Injection; Fuel Injection Lines Group | 1 |
1w5860 Muffler Gp
| 1W***60 | Muffler Group | 1 |
4w0469 Pump Gp-Fuel Injection
| 4W***69 | Pump Group-Fuel Injection | 1 |
1w6539 Pump Gp-Fuel Injection
| 1W***39 | Pump Group-Fuel Injection | 1 |
8n5251 Pump Gp-Fuel Priming & Primary Filter
| 8N***51 | Pump Group-Fuel Prime & Prim Filter | 1 |
8n3365 Pump Gp-Fuel Priming
| 8N***65 | Pump Group-Fuel Priming; Priming Pump-Fuel & Primary Filter | 1 |
2w4403 Pump Gp-Fuel Transfer
| 2W***03 | Pump Group-Fuel Transfer; Fuel Transfer Pump Group | 1 |
1w0568 Pump Gp-Transfer Fuel
| 1W***68 | Pump Group-Fuel Transfer | 1 |
8v2259 Tank Gp-Fuel
| 8V***59 | Tank Group-Fuel | 1 |
1w3598 Control Gp-Torque-Type 1
| 1W***98 | Torque Control Group | 1 |
1w3598 Torque Control Gp-Type 2
| 1W***98 | Torque Control Group | 1 |
Hydraulic System
9t3819 Rotating Gp-Pump
| 9T***19 | Rotating Group-Pump | 1 |
8v2281 Control Gp-Grapple Hand
| 8V***81 | Control Group-Hand | 1 |
8v2262 Control Gp-Hydraulic Hand
| 8V***62 | Control Group-Hydraulic Hand | 1 |
8v2282 Cylinder & Mounting Gp
| 8V***82 | Cylinder & Mounting Group | 1 |
8v2263 Cylinder & Mounting Gp-Lift
| 8V***63 | Cylinder & Mounting Group | 1 |
4t0863 Cylinder Gp-Boom-(Change 2)
| 4T***63 | Cylinder Group-Boom | 1 |
4t0863 Cylinder Gp-Boom-(Change 1)
| 4T***63 | Cylinder Group-Boom | 1 |
4t9394 Cylinder Gp-Lift-Lh-(Change 1)
| 4T***94 | Cylinder Group-Lift | 1 |
4t9394 Cylinder Gp-Lift-Lh-(Change 2)
| 4T***94 | Cylinder Group-Lift | 1 |
4t0862 Cylinder Gp-Lift-Rh-(Change 1)
| 4T***62 | Cylinder Group-Lift | 1 |
4t0862 Cylinder Gp-Lift-Rh-(Change 2)
| 4T***62 | Cylinder Group-Lift | 1 |
8v2264 Lines Gp-Bulldozer
| 8V***64 | Lines Group-Bulldozer | 1 |
8v2286 Lines Gp-Grapple-Part 2 Of 3
| 8V***86 | Lines Group-Grapple | 1 |
8v2286 Lines Gp-Grapple-Part 3 Of 3
| 8V***86 | Lines Group-Grapple | 1 |
8v2286 Lines Gp-Grapple-Part 1 Of 3
| 8V***86 | Lines Group-Grapple | 1 |
8v2250 Lines Gp-Trunnion Grease
| 8V***50 | Lines Group-Grease | 1 |
8r3655 Lines Gp-Grease
| 8R***55 | Lines Group-Grease | 1 |
8v9224 Lines Gp-Hydraulic Oil-Part 2 Of 2
| 8V***24 | Lines Group-Hydraulic Oil | 1 |
8v9224 Lines Gp-Hydraulic Oil-Part 3 Of 3
| 8V***24 | Lines Group-Hydraulic Oil | 1 |
8v2266 Lines Gp-Hydraulic Oil-Part 2 Of 3
| 8V***66 | Lines Group-Hydraulic Oil | 1 |
8v9224 Lines Gp-Hydraulic Oil-Part 1 Of 2
| 8V***24 | Lines Group-Hydraulic Oil | 1 |
8v9224 Lines Gp-Hydraulic Oil-Part 2 Of 3
| 8V***24 | Lines Group-Hydraulic Oil | 1 |
8v9224 Lines Gp-Hydraulic Oil-Part 1 Of 3
| 8V***24 | Lines Group-Hydraulic Oil | 1 |
8v2266 Lines Gp-Hydraulic Oil-Part 3 Of 3
| 8V***66 | Lines Group-Hydraulic Oil | 1 |
8v2266 Lines Gp-Hydraulic Oil-Part 1 Of 3
| 8V***66 | Lines Group-Hydraulic Oil | 1 |
3t4961 Lines Gp-Winch
| 3T***61 | Lines Group-Winch | 1 |
8r7339 Lines Gp-Winch-Part 2 Of 2
| 8R***39 | Lines Group-Winch | 1 |
8v2275 Lines Gp-Winch-Part 2 Of 2
| 8V***75 | Lines Group-Winch | 1 |
8v2275 Lines Gp-Winch-Part 1 Of 2
| 8V***75 | Lines Group-Winch | 1 |
8r7339 Lines Gp-Winch-Part 1 Of 2
| 8R***39 | Lines Group-Winch | 1 |
8v2280 Pump & Mounting Gp-Hydraulic
| 8V***80 | Pump & Mounting Group | 1 |
4t5056 Pump Gp-Piston
| 4T***56 | Pump Group-Piston | 1 |
4t9424 Tank & Filter Gp-Hydraulic-Part 1 Of 2
| 4T***24 | Tank & Filter Group | 1 |
4t9424 Tank & Filter Gp-Hydraulic-Part 2 Of 2
| 4T***24 | Tank & Filter Group | 1 |
9v1712 Tank & Mounting Gp-Hydraulic
| 9V***12 | Tank & Mounting Group-Hydraulic | 1 |
4t4745 Valve Gp-Bank
| 4T***45 | Valve Group-Bank | 1 |
9t3220 Valve Gp-Control
| 9T***20 | Valve Group-Control | 1 |
9t3222 Valve Gp-Control
| 9T***22 | Valve Group-Control | 1 |
9t3221 Valve Gp-Control
| 9T***21 | Valve Group-Control | 1 |
9t7023 Valve Gp-Pressure & Flow Compensator
| 9T***23 | Valve Group-Press & Flow Cmpnstr | 1 |
9t3223 Valve Gp-Pilot Operated Relief
| 9T***23 | Valve Group-Relief | 1 |
9t5600 Valve Gp-Hydraulic Relief
| 9T***00 | Valve Group-Relief | 1 |
Implements
8v2261 Bulldozer Gp-Skidder
| 8V***61 | Bulldozer Group-Skidder | 1 |
3t4960 Case & Covers Gp-Winch
| 3T***60 | Case & Covers Group-Differential | 1 |
3t4959 Gear & Clutch Gp-Part 2 Of 2
| 3T***59 | Clutch & Gear Group | 1 |
3t4959 Gear & Clutch Gp-Part 1 Of 2
| 3T***59 | Clutch & Gear Group | 1 |
6w1587 Control & Mounting Gp-Winch
| 6W***87 | Control & Mounting Group | 1 |
8r6678 Control & Mounting Gp-Winch
| 8R***78 | Control & Mounting Group | 1 |
4t0859 Cylinder Gp-Grapple
| 4T***59 | Cylinder Group-Grapple | 1 |
4t0859 Cylinder Gp-Grapple-(Change 1)
| 4T***59 | Cylinder Group-Grapple | 1 |
8v2273 Drive Gp-Winch
| 8V***73 | Drive Group-Winch | 1 |
8v2240 Fairlead Gp-Log Skidder
| 8V***40 | Fairlead Group-Log Skidder | 1 |
6w6736 Fairlead Gp-Log Skidder
| 6W***36 | Fairlead Group-Log Skidder | 1 |
8v2285 Head Gp-Grapple
| 8V***85 | Head Group-Grapple | 1 |
8v2276 Mounting Gp-Winch
| 8V***76 | Mounting Group-Winch | 1 |
9v1691 Roller Gp-Top
| 9V***91 | Roller Group-Top; Roller Gp-Top (Winch Cable) | 1 |
9v1693 Snubber Gp-Grapple
| 9V***93 | Snubber Group-Grapple | 1 |
6y0746 Valve Gp-Winch
| 6Y***46 | Valve Group-Winch | 1 |
3t6327 Valve Gp-Winch
| 3T***27 | Valve Group-Winch | 1 |
3t4958 Winch Ar-Towing
| 3T***58 | Winch Ar-Towing | 1 |
| 3T***59 | Clutch & Gear Group | 1 |
| 3T***60 | Case & Covers Group-Differential | 1 |
Lubrication System
1w7298 Breather Gp-Crankcase
| 1W***98 | Breather Group; Breather Gp-Crankcase | 1 |
7c3989 Filler Gp-Oil
| 7C***89 | Filler Group-Oil | 1 |
7w5810 Filler Gp-Oil
| 7W***10 | Filler Group-Oil | 1 |
8n5930 Filter Gp-Engine Oil
| 8N***30 | Filter Group-Engine Oil; Engine Oil Filter Group | 1 |
7e5377 Disposol Gp
| 7E***77 | Fumes Disposal Group | 1 |
4w9974 Gauge Gp-Engine Oil Level-(Dipstick)
| 4W***74 | Gauge Group-Oil Level (Dipstick) | 1 |
7c4702 Gauge Gp-Engine Oil Level-(Dipstick)
| 7C***02 | Gauge Group-Oil Level (Dipstick) | 1 |
4w9975 Pump Gp-Engine Oil
| 4W***75 | Pump Group-Engine Oil | 1 |
Power Train-Power Transmission Unit
8v2821 Axle Ar-Engine End
| 8V***21 | Axle Ar-Engine End | 1 |
| 8V***25 | Differential & Bevel Gear Group; Gear Gp-Differential & Bevel | 1 |
| 9V***97 | Axle Group-Oscillating | 1 |
6w6600 Axle Ar-Heavy Duty
| 6W***52 | Wheel & Final Drive Group; Final Drive & Wheel Gp | 4 |
| 6W***53 | Axle Group-Fixed | 1 |
| 6W***54 | Axle Group-Oscillating | 1 |
8v2822 Axle Ar-Non Engine End
| 8V***22 | Axle Ar-Non-Engine End | 1 |
| 8V***26 | Differential & Bevel Gear Group | 1 |
| 9V***96 | Axle Group-Fixed | 1 |
6w6353 Axle Gp-Fixed
| 6W***53 | Axle Group-Fixed | 1 |
9v1196 Axle Gp-Fixed
| 9V***96 | Axle Group-Fixed | 1 |
9v1197 Axle Gp-Oscillating
| 9V***97 | Axle Group-Oscillating | 1 |
6w6354 Axle Gp-Oscillating
| 6W***54 | Axle Group-Oscillating | 1 |
8v2237 Control Gp-Transmission-Part 1 Of 2
| 8V***37 | Control Group-Transmission | 1 |
8v2237 Control Gp-Transmission-Part 2 Of 2
| 8V***37 | Control Group-Transmission | 1 |
9w1182 Cover Gp-Transmission
| 9W***82 | Cover Group-Transmission | 1 |
8v2825 Gear Gp-Differential & Bevel
| 8V***25 | Differential & Bevel Gear Group; Gear Gp-Differential & Bevel | 1 |
8v2826 Gear Gp-Differential & Bevel
| 8V***26 | Differential & Bevel Gear Group | 1 |
8v2827 Differential Gp
| 8V***27 | Differential Group | 1 |
8r7291 Differential Gp
| 8R***91 | Differential Group | 1 |
8v3966 Differential Gp
| 8V***66 | Differential Group; Differential Group | 1 |
8v2271 Drive Shaft Gp
| 8V***71 | Drive Shaft Group | 1 |
6w4019 Drive Shaft Gp
| 6W***19 | Drive Shaft Group | 1 |
8v2268 Filler Gp-Oil
| 8V***68 | Filler Group-Oil | 1 |
8v2268 Filler Gp-Power Train Oil
| 8V***68 | Filler Group-Oil | 1 |
8v2269 Lines & Filter Gp-Power Train
| 8V***69 | Filter & Lines Group | 1 |
902852 Filter Gp-Hydraulic Oil
| 09***52 | Filter Group-Oil; -Winch | 1 |
8v2270 Lines Gp-Torque Converter Cooler
| 8V***70 | Lines Group-Torque Conv Cooler | 1 |
4w4267 Mounting Gp-Engine & Transmission
| 4W***67 | Mounting Group-Engine & Tmsn | 1 |
9w1163 Pump Gp-Charging
| 9W***63 | Pump Group-Charge | 1 |
6y4932 Pump Gp-Charging
| 6Y***32 | Pump Group-Charge | 1 |
6w9873 Rim Gp-Demountable-4 Required
| 6W***73 | Rim Group-Demountable | 1 |
9v1930 Rim Gp-Demountable-4 Required
| 9V***30 | Rim Group-Demountable | 1 |
8r3221 Rim Gp-Demountable-4 Required
| 8R***21 | Rim Group-Demountable | 1 |
8v0813 Rim Gp-Demountable
| 8V***13 | Rim Group-Demountable | 1 |
9v1934 Rim Gp-Demountable-4 Required
| 9V***34 | Rim Group-Demountable | 1 |
8v2833 Rim Gp-Demountable
| 8V***33 | Rim Group-Demountable | 1 |
6w2244 Rim Gp-Demountable-4 Required
| 6W***44 | Rim Group-Demountable | 1 |
9v1936 Tire Gp-Rim-Spare
| 2D***31 | Nut; (0.482-26-Thd) | 1 |
| 6D***43 | Housing Assem. (External Threads) | 1 |
| 7K***75 | Tire Tube Group | 1 |
9v1938 Tire & Rim Ar-Spare
| 2D***31 | Nut; (0.482-26-Thd) | 1 |
| 3V***11 | Tire Tube Group | 1 |
| 6D***43 | Housing Assem. (External Threads) | 1 |
9v1937 Tire & Rim Ar
| 3V***10 | Tire Tube Group | 1 |
| 9K***24 | Cap-Pipe | 1 |
| 9V***31 | Rim As | 1 |
6w8348 Rim & Tire Gp-Spare
| 2D***31 | Nut; (0.482-26-Thd) | 1 |
| 6D***43 | Housing Assem. (External Threads) | 1 |
| 6W***48 | Tire & Rim Group | 1 |
6w6350 Rim & Tire Gp
| 2D***11 | Valve Group-Tire | 1 |
| 4K***79 | Seal-O-Ring | 1 |
| 4K***81 | Ring-Lock; (Lock) | 1 |
6y2286 Torque Converter Gp
| 6Y***86 | Torque Converter Group | 1 |
6y5179 Torque Converter Gp
| 6Y***79 | Torque Converter Group | 1 |
9w1178 Torque Converter Gp
| 9W***78 | Torque Converter Group | 1 |
7t9500 Transmission Gp-Torque Converter-Part 1 Of 6
| 7T***00 | Transmission Group-Torque Conv | 1 |
7t9500 Transmission Gp-Torque Converter-Part 3 Of 6
| 7T***00 | Transmission Group-Torque Conv | 1 |
7t9500 Transmission Gp-Torque Converter-Part 5 Of 6
| 7T***00 | Transmission Group-Torque Conv | 1 |
8e3329 Transmission Gp-Torque Converter-Part 1 Of 6
| 8E***29 | Transmission Group-Torque Conv | 1 |
7t9500 Transmission Gp-Torque Converter-Part 4 Of 6
| 7T***00 | Transmission Group-Torque Conv | 1 |
8e3329 Transmission Gp-Torque Converter-Part 4 Of 6
| 8E***29 | Transmission Group-Torque Conv | 1 |
8e3329 Transmission Gp-Torque Converter-Part 3 Of 6
| 8E***29 | Transmission Group-Torque Conv | 1 |
7t9500 Transmission Gp-Torque Converter-Part 6 Of 6
| 7T***00 | Transmission Group-Torque Conv | 1 |
7t9500 Transmission Gp-Torque Converter-Part 2 Of 6
| 7T***00 | Transmission Group-Torque Conv | 1 |
8e3329 Transmission Gp-Torque Converter-Part 2 Of 6
| 8E***29 | Transmission Group-Torque Conv | 1 |
8e3329 Transmission Gp-Torque Converter-Part 5 Of 6
| 8E***29 | Transmission Group-Torque Conv | 1 |
8e3329 Transmission Gp-Torque Converter-Part 6 Of 6
| 8E***29 | Transmission Group-Torque Conv | 1 |
8v6952 Universal Joint Gp
| 8V***52 | Universal Joint Group; Universal Joint Group-- Rockwell International | 1 |
8v6951 Universal Joint Gp
| 5V***32 | Universal Joint Group; Universal Joint Group-- Dana Corporation | 1 |
| 8V***51 | Universal Joint Group | 1 |
| 8V***52 | Universal Joint Group; Universal Joint Group-- Rockwell International | 1 |
5v3732 Universal Joint Gp
| 5V***32 | Universal Joint Group; Universal Joint Group-- Dana Corporation | 1 |
6y0635 Valve Gp-Brake Control
| 6Y***35 | Valve Group-Brake Control | 1 |
9w1130 Valve Gp-Control
| 9W***30 | Valve Group-Control | 1 |
6y5851 Valve Gp-Control
| 6Y***51 | Valve Group-Control | 1 |
9v7948 Wheel & Final Drive Gp-2 Required
| 9V***48 | Wheel & Final Drive Group | 1 |
6w6352 Final Drive & Wheel Gp
| 6W***52 | Wheel & Final Drive Group; Final Drive & Wheel Gp | 1 |
Service Equipment And Supplies
6v4920 Cable Cutter Gp
| 6V***20 | Cutter Group-Cable | 1 |
6w1567 Extinguisher Gp-Fire
| 6W***67 | Fire Extinguisher Group | 1 |
8k7534 Extinguisher Gp-Fire
| 8K***34 | Fire Extinguisher Group | 1 |
Name Plates & Films
| 2P***31 | Film--Cat On Each Side Of Radiator Guard; Film--Cat On Each Side--Above Drum Shaft | 2 |
| 3N***90 | Plate Serial Number; On R.H. Rear Bank Of Cylinder Block As Viewed From Rear Of Engine | 1 |
| 4B***58 | Screw (Identification Plate) Mounting | 26 |
Starting And Electrical System
9w3043 Alternator Gp*R
| 9W***43 | Alternator Group-Charging; (24-Volt, 52-Ampere) | 1 |
1w7458 Alternator Gp
| 1W***58 | Alternator Group-Charging | 1 |
8v2260 Battery & Wiring Gp-Part 1 Of 3
| 8V***60 | Battery & Wiring Group | 1 |
8v2260 Battery & Wiring Gp-Part 3 Of 3
| 8V***60 | Battery & Wiring Group | 1 |
8v2260 Battery & Wiring Gp-Part 2 Of 3
| 8V***60 | Battery & Wiring Group | 1 |
3t2135 Lamp Gp-Flood
| 3T***35 | Lamp Group-Flood; (24 Volt) | 1 |
3t2128 Lamp Gp-Head
| 3T***28 | Lamp Group-Head | 1 |
9v1680 Lighting Gp-4 Lamps
| 9V***80 | Lighting Group | 1 |
7c5401 Mounting Gp-Alternator
| 7C***01 | Mounting Group-Alternator | 1 |
3t3421 Solenoid As
| 3T***21 | Solenoid As | 1 |
3t4704 Solenoid As
| 3T***04 | Solenoid As-Starter; (24-Volt) | 1 |
9v1673 Starting Aid Gp-Ether
| 9V***73 | Starting Aid Group-Ether | 1 |
3t2371 Starting Motor Gp-Electric
| 3T***71 | Starting Motor Group-Electric; Electric Starting Motor Group | 1 |
3t2756 Starting Motor Gp-Electric-Part 3 Of 3
| 3T***56 | Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy | 1 |
3t2764 Starting Motor Gp-Electric*R
| 3T***71 | Starting Motor Group-Electric; Electric Starting Motor Group | 1 |
| 3T***56 | Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy | 1 |
| 3T***64 | Starting Motor Group-Electric | 1 |
9x4454 Starting Motor Gp-Electric
| 9X***54 | Starting Motor Group-Electric; Starting Motor Group (Nippondenso) | 1 |
6n1678 Starting Motor Gp-Electric
| 6N***78 | Starting Motor Group-Electric | 1 |
3t2756 Starting Motor Gp-Electric-Part 2 Of 3
| 3T***56 | Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy | 1 |
8c3594 Starting Motor Gp-Electric *R
| 8C***94 | Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy | 1 |
3t2756 Starting Motor Gp-Electric-Part 1 Of 3
| 3T***56 | Starting Motor Group-Electric; Starting Motor Gp-Electric-Delco-Remy | 1 |
9g7641 Switch Gp-Start
| 9G***41 | Switch Group-Start; -Engine, Key-Vims Service | 1 |
9v1672 Warning Gp-Backup
| 9V***72 | Warning Group-Backup | 1 |
6w1560 Wiring Gp-Powertrain
| 6W***60 | Wiring Group-Power Train | 1 |
Steering And Braking System
8v2234 Control Gp-Parking Brake
| 8V***34 | Control Group-Parking Brake | 1 |
8v2233 Control Gp-Parking Brake
| 8V***33 | Control Group-Parking Brake | 1 |
8v2236 Control Gp-Steering
| 8V***36 | Control Group-Steering | 1 |
8v2238 Cylinder & Mounting Gp-Steering
| 8V***38 | Cylinder & Mounting Group | 1 |
9c1924 Cylinder & Seal Gp-Steering-L.H.
| 9C***24 | Cylinder & Seal Group-Steering; (L.H.) | 1 |
9c1925 Cylinder & Seal Gp-Steering-R.H.
| 9C***25 | Cylinder & Seal Group-Steering; (R.H.) | 1 |
4t0861 Cylinder Gp-Steering-L.H.-(Change 1)
| 4T***61 | Cylinder Group-Steering | 1 |
4t0860 Cylinder Gp-Steering-R.H.-(Change 1)
| 4T***60 | Cylinder Group-Steering | 1 |
9t4112 Lever Gp
| 9T***12 | Lever Group | 1 |
4t2061 Lever Gp
| 4T***61 | Lever Group | 1 |
8v2252 Lines Gp-Steering Oil-Part 2 Of 2
| 8V***52 | Lines Group-Steering Oil | 1 |
8v2252 Lines Gp-Steering Oil-Part 1 Of 2
| 8V***52 | Lines Group-Steering Oil | 1 |
9v1689 Lines Gp-Supplemental Steering
| 9V***89 | Lines Group-Supplemental Steering | 1 |
9v1688 Mounting & Pump Gp
| 9V***88 | Pump & Mounting Group | 1 |
9t5140 Pump Gp-Steering Gear
| 9T***40 | Pump Group-Gear | 1 |
8r5709 Service Gp-Brake
| 1B***76 | Pin,Straight,Headed Governor And Decelerator Control | 2 |
| 1B***06 | Key-Woodruff | 2 |
| 1H***01 | Link | 2 |
6w7950 Steering Ar-Supplemental
| 6W***60 | Valve & Mounting Group | 1 |
| 6W***30 | Valve & Mounting Group | 1 |
| 6W***50 | Steering Ar-Supplemental | 1 |
9v1687 Steering Ar-Supplemental
| 6W***60 | Valve & Mounting Group | 1 |
| 9C***90 | Guard Group-Drive Shaft | 1 |
| 9V***87 | Steering Ar-Supplemental | 1 |
6w7930 Valve & Mounting Gp
| 6W***30 | Valve & Mounting Group | 1 |
6w4060 Valve & Mounting Gp-Steering
| 6W***60 | Valve & Mounting Group | 1 |
9v1708 Valve & Mounting Gp
| 9V***08 | Valve & Mounting Group-Steering | 1 |
9v1708 Valve & Mounting Gp-Steering
| 9V***08 | Valve & Mounting Group-Steering | 1 |
9v1713 Valve & Mounting Gp-Steering
| 9V***13 | Valve & Mounting Group-Steering | 1 |
6w6707 Valve & Mounting Gp-Steering
| 6W***07 | Valve & Mounting Group-Steering | 1 |
4t4601 Valve Gp
| 4T***01 | Valve Group | 1 |
4t4971 Valve Gp
| 4T***71 | Valve Group | 1 |
9t5718 Valve Gp-Unit-2
| 9T***18 | Valve Group | 1 |
9t2888 Valve Gp
| 9T***88 | Valve Group | 1 |
4t4972 Valve Gp-Inlet Flow & Relief
| 4T***72 | Valve Group | 1 |
9t2123 Valve Gp
| 9T***23 | Valve Group | 1 |
9t8541 Valve Gp-Inlet Flow Control & Control
| 9T***41 | Valve Group | 1 |
9t5719 Valve Gp-Unit-2
| 9T***19 | Valve Group | 1 |
9t8541 Valve Gp-Inlet Flow Control & Relief
| 9T***41 | Valve Group | 1 |
9t0432 Valve Gp-Reversing
| 9T***32 | Valve Group | 1 |
9t5169 Valve Gp
| 9T***69 | Valve Group | 1 |
9t5720 Valve Gp-Unit-2
| 9T***20 | Valve Group | 1 |
9t2124 Valve Gp
| 9T***24 | Valve Group | 1 |
9t1574 Valve Gp
| 9T***74 | Valve Group | 1 |
6e1234 Valve Gp
| 6E***34 | Valve Group | 1 |
9t5721 Valve Gp-Unit-2
| 9T***21 | Valve Group | 1 |
4t4598 Valve Gp-Check & Relief
| 4T***98 | Valve Group-Check | 1 |
9t4521 Valve Gp-Check & Relief
| 9T***21 | Valve Group-Check & Relief | 1 |
9t5168 Valve Gp-Control-Steering
| 9T***68 | Valve Group-Control | 1 |
9t5171 Valve Gp-Control
| 9T***71 | Valve Group-Control | 1 |
4t4969 Valve Gp-Steering Control
| 4T***69 | Valve Group-Control | 1 |
4t4600 Valve Gp-Control
| 4T***00 | Valve Group-Control | 1 |
4t2531 Valve Gp-Relief
| 4T***31 | Valve Group-Relief | 1 |
9t6041 Valve Gp-Relief-Direct Operated
| 9T***41 | Valve Group-Relief | 1 |
4t1860 Valve Gp-Shuttle
| 4T***60 | Valve Group-Shuttle; -Ripper Lift-Ripper Tilt-Blade Tilt-Blade Lift | 1 |
508 serial number reference
Read the first three characters of the serial number as the prefix identifying the production block, and the digits that follow as the sequential unit number within that block. The identification plate on a machine of this era is a riveted metal tag on the frame or cab structure; some machines of this vintage carry a duplicate tag as well. Confirm exact plate location with a dealer or the operation and maintenance manual for the specific unit.
| Prefix | Identifies | Notes |
|---|---|---|
| 9NC | 508 Wheel-Type Skidder / Grapple Skidder, powered by 3204 engine | Serial range 9NC1 and up, covered by the same parts catalog as 2HD as a separate production block for the same 508 machine line (not a distinct cable-only submodel per the catalog machine header). Approx. mid-1980s production. Confirm exact build year with dealer. |
| 2HD | 508 Wheel-Type Skidder / Grapple Skidder, powered by 3204 engine | Serial range 2HD1 (2HD00001) and up, the same parts catalog as 9NC. Catalog machine header reads 'Skidder and Grapple Skidder' for this prefix, so treat any cable/grapple split by prefix as unconfirmed. Approx. 1986 production window; confirm exact build year with dealer. |
Frequently asked questions
What engine does the Caterpillar 508 skidder use?
A Cat 3204 inline four-cylinder diesel with mechanical injection and no electronic engine controller, rated at roughly 70.8 kW (95 hp) gross.
What is the operating weight of the Caterpillar 508?
It varies by configuration: about 7,770 kg (17,130 lb) for the cable skidder, and about 8,767 kg (19,326 lb) for the grapple skidder.
What replaced the Caterpillar 508 skidder?
Not documented. No confirmed successor model is tied to the 508 in available Cat parts or catalog records. Later Cat wheel skidders such as the 518 and 525 families occupy different weight classes, but no source ties them to the 508 as a direct replacement, so this should be treated as an open question rather than a documented lineage.
What 508 owners discuss
What's the most common transmission complaint on the Cat 508?
Forward gear slip and rising transmission oil temperature under sustained pulling load top the list. Worn pump or motor swash plates cut hydrostatic charge pressure, and once the unit runs hot the seals stop sealing, which pushes toward a full transmission teardown. The 508 runs a Funk-built transmission, not a Cat-built one, so parts and rebuild specialists usually come through Funk transmission channels rather than a Cat powertrain dealer alone. Check charge pressure and oil temperature first. Have your dealer or a qualified transmission shop verify swash-plate wear before committing to a rebuild.
Why does an older 508 stall or lose power only on steep ground?
That pattern points to fuel starvation, not the mechanical-injection 3204 itself. Two causes recur: a fuel pickup tube inside the tank rusted through, and cracked nylon check valves in the fuel transfer pump. Either lets the pump lose prime once the fuel surface tilts away from the pickup on a grade, while the machine runs fine on level ground. Pull the tank and transfer pump and inspect both before chasing the injection pump itself.
Arch lift and grapple both feel sluggish even though pump pressure tests normal - what's going on?
A normal relief-pressure reading (reports run around 179 bar/2600 psi at full relief) combined with every function running slow points away from the pump and toward a restriction shared by all circuits - a pinched or partially collapsed supply line, or a control valve bypassing internally. Isolate it with pressure test tees installed at each function, and by swapping relief valve cartridges between circuits. If the slowness follows the valve when swapped, the valve is at fault; if it stays with the line, look at the line or a restriction/filter ahead of it.
What winch issues come up with the 508's cable winch?
New owners often aren't sure where to fill winch fluid or what type to use - the winch has its own fill point separate from the transmission and main hydraulic system, and putting the wrong fluid in it is a common early mistake worth avoiding. On this style of cable winch generally, a drum that pulls line in fine but won't freespool on release usually traces to worn expanding-clutch linings, brake bands stuck from sitting idle, or lines crossed at the control valve after prior service work. Have a winch specialist confirm clutch and brake condition before replacing the control valve.
Are there sensor or electrical gremlins to worry about on a 508?
Not in the modern sense. The 508 predates any engine or transmission control module, so there is no diagnostic code chain to chase. Reported electrical complaints are basic: gauges that jump on cranking then go dead, and charging failures traced to alternator wiring mix-ups after a non-factory alternator swap. Most of these trace back to bad grounds, corroded bulkhead connectors, or a wrong-plug alternator rather than a failed sensor. Have an electrician confirm alternator output and ground continuity before swapping gauges or the instrument panel.
Where does wear concentrate on a wheel-type machine like the 508?
Being wheeled rather than tracked, wear shows up in the tires (commonly 23.1x26), the articulation hitch/center pins, and the radiator core. Forestry duty packs the radiator and screen with leaves and bark, and keeping that airflow path clear is routine upkeep rather than an occasional job - pull the screen and blow it out before the temperature gauge complains. Looseness felt at the articulation joint under load signals center-pin wear; that joint sees constant frame flex from pulling loaded trees and needs a tight grease interval.
What should I check before buying a used 508?
Run the transmission under load and watch for gear slip and oil temperature climb, since it's a Funk unit and a rebuild is a real cost driver. Cycle the winch, arch, and grapple functions and time them rather than trusting a single pump-pressure reading. Check tires and the articulation joint for wear and play. Pull the radiator screen and look for packed debris. Ask if the machine has ever stalled on hills, since that flags the fuel pickup tube and transfer pump check valves. Get service records if the seller has them, and confirm the serial prefix (2HD or 9NC) matches the paperwork. Have an independent heavy-equipment mechanic run a full hydraulic pressure check and a transmission load test before closing the deal.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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