Caterpillarwheel-type loaderwheel loader
Caterpillar 988
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 988 is Caterpillar's original large articulated wheel-type loader, built from 1963 through the mid-to-late 1970s under the 87A serial-number prefix. It runs a Caterpillar D343 six-cylinder naturally aspirated diesel, rated 224 kW (300 hp) at introduction and rising to about 242 kW (325 hp) by 1968. Operating weight spans roughly 28,600-35,800 kg (63,000-79,000 lb) depending on bucket, cab, and counterweight configuration. Power reaches the ground through a single-lever powershift transmission and torque-converter drive, with full-frame articulated steering. Factory configurations ranged from an open canopy to a fully enclosed heated cab, 12- or 24-volt electrics, general-purpose or rock buckets, a ripper-scarifier, and a log-fork logging arrangement. The 988B replaced it as Caterpillar's next-generation large wheel loader.
Within this one production run Caterpillar grew the 988 steadily: gross horsepower climbed from 300 to 325 hp, bucket capacity expanded from a 5 cu yd (3.8 m3) standard toward 6-7 cu yd (4.6-5.4 m3) options, and a variable-capacity torque converter became standard equipment later in the build. None of that changed the core D343-and-powershift architecture, so parts and service knowledge carry across most of the run. The 988B that followed moved to an entirely different engine family, making the original 87A-prefix 988 its own distinct parts population. Today these machines survive mainly as working antiques in quarry, forestry, and scrapyard duty, or as collector pieces; parts support leans on the D343's shared history as an industrial and marine engine, and buyers price them around known-expensive wear points, engine condition, front-end pins and bushings, hydraulic pump, and tires, rather than by hour meter alone.
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 988 specifications
Engine
| Engine model | Cat D343, 6-cylinder inline naturally aspirated diesel — the original engine fitted across the base 988 production run, predecessor to the 988B |
| Gross power | 224 kW (300 hp) flywheel at introduction, later increased to about 242 kW (325 hp) as the engine and induction package were upgraded within the same production run |
| Displacement | 14.6 L (893 cu in) |
| Cylinders | 6, inline |
| Emissions tier | None — mechanically governed, pre-emissions diesel; this generation predates EPA/Tier nonroad emissions standards |
Weights
| Operating weight | Reported figures range roughly 28,600–35,800 kg (63,000–79,000 lb); varies by production year and configuration across the run — heavier ROPS-cab, larger-tire, bigger-bucket units trend toward the top of the range |
| Static tipping load (straight) | Approx. 18,100 kg (40,000 lb) as published for this generation |
| Ground pressure | Not documented in available specification sources for this generation |
Dimensions
| Overall length | Approx. 8.63 m (28 ft 4 in), bumper to bucket at ground |
| Overall width | Approx. 2.97 m (9 ft 9 in) |
| Overall height | Approx. 3.71 m (12 ft 2 in) to top of exhaust stack |
| Wheelbase | 3.56 m (140 in) |
| Ground clearance | Not documented in available specification sources for this generation |
Performance
| Max travel speed | 34.8 km/h (21.6 mph), forward and reverse |
| Bucket capacity | Approx. 3.8–5.4 m³ (5.0–7.0 cu yd) depending on bucket fitted — the loader launched with a 5 cu yd bucket and later bucket options grew to 6–7 cu yd within the same production run |
| Breakout force | Approx. 267 kN (29.5 tons) |
| Transmission and steering | Cat power-shift transmission, single-lever shifting, torque-converter drive (a variable-capacity torque converter became standard later in the run); full-frame articulated steering |
Service capacities (summary)
| Fuel tank | Not documented in available public specification sources for this generation — verify against your unit's serial range with a dealer or OEM archive |
| Hydraulic system | Not documented in available public specification sources for this generation |
| Engine oil (crankcase) | Not documented in available public specification sources for this generation |
| Cooling system | Not documented in available public specification sources for this generation |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
988 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not published in available sources for this original D343-powered 988 (1963-1976, pre-988B); confirm against the machine's own lubrication chart or a dealer, since later 988B/F/F II/G/H/K figures do not apply to this engine/generation | Caterpillar Diesel Engine Oil, SAE grade selected by ambient temperature per the lubrication chart; change with every scheduled oil-and-filter interval |
| Cooling system | Not published in available sources for this generation; verify against the lubrication chart or dealer | Ethylene-glycol base antifreeze/coolant mixed with clean water at the ratio the lubrication chart specifies for the operating climate |
| Fuel tank | Not published in available sources for this generation; verify against the lubrication chart or dealer | No. 2-D diesel fuel, or a winter-grade/No. 1-D blend in cold climates, per the lubrication chart |
| Transmission and torque converter (power shift) | Not published in available sources for this generation; verify against the lubrication chart or dealer | Caterpillar Transmission/Drive Train Oil (TDTO-type), SAE grade selected by ambient temperature per the lubrication chart |
| Front axle (differential and final drives) | Not published in available sources for this generation; varies further by differential option (standard, no-spin, or torque-proportioning) fitted; verify against the lubrication chart or dealer | Caterpillar Transmission/Drive Train Oil (TDTO-type) gear oil, SAE grade selected by ambient temperature |
| Rear axle (differential and final drives) | Not published in available sources for this generation; verify against the lubrication chart or dealer | Caterpillar Transmission/Drive Train Oil (TDTO-type) gear oil, SAE grade selected by ambient temperature |
| Hydraulic system and tank | Not published in available sources for this generation; later 988B (roughly 72 US gal / 273 L system) and newer 988-family figures are a different design and do not carry over to this original machine; verify against the lubrication chart or dealer | Caterpillar hydraulic oil (HYDO-type), SAE grade selected by ambient temperature per the lubrication chart |
| Grease (chassis lubrication points) | Spec only - no reservoir capacity; regreased at scheduled hour intervals per the lubrication chart | Caterpillar multipurpose chassis grease, NLGI 2 (NLGI 1 or 0 in sub-zero climates) |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 988 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 988 beyond the schedule
Predictive Maintenance & Fluid Analysis
This is a pre-electronic machine, with no ECM and no fault codes, so predictive maintenance means gauges, samples, and eyes. Pull engine, powershift/converter, and front/rear axle oil samples at scheduled changes and send them for analysis; wear metals in the D343 or axle housings show up in oil long before a gauge moves. Watch the torque converter oil temperature gauge under load and the charging lamp at idle. Track air-cleaner restriction and fuel-filter condition between full services rather than waiting for a power loss.
Corrective & Common Repairs
Common faults trace to a handful of usual suspects on this generation. Apparent torque-converter slip is often a mis-adjusted or disconnected converter control linkage, not internal wear; check linkage before tearing into the converter. A no-charge lamp usually means a slipping belt, bad terminal, or failed alternator on the 24-volt system. After long storage, expect the D343 injection pump to need service before it runs clean; stuck plungers are common on idle machines. Verify the oil-pressure safety switch if the engine cranks but won't catch.
Overhaul & Rebuild Points
Engine, front end, and hydraulics are where the money goes on a high-hour original 988. A tired D343 needing liners, bearings, and valve work is the costliest rebuild on the machine. Articulation, loader-arm, and bucket-linkage pins and bushings wear out after decades of duty and demand a full front-end rebuild, not spot fixes. Budget for the lift/tilt hydraulic pump and cylinders if leakage or slow cycle times persist after reseal, and for the torque converter if overheating continues once linkage and cooler are ruled out.
Seasonal & Environment Servicing
Cold starts on the D343's indirect-injection diesel need preheat; lean on the ether starting-aid group and strong 24-volt batteries rather than prolonged cranking. Never lug this engine at low idle to save fuel in cold weather; the pre-chamber design wets out and fouls instead of burning clean. In dusty quarry or demolition work, fit the dust-guard group and service the air cleaner more often than the standard interval. This is a heavy, four-tire machine that needs solid, graded ground; soft or ungraded material lets it punch through instead of floating.
988 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| No CID/FMI code — ENGINE OIL PRESSURE warning lamp (dash, red) | Oil pressure sender has tripped below the safe minimum for the D343 lubrication system | Low crankcase oil level, worn or failing oil pump, clogged suction screen or filter, or a faulty pressure switch | Shut down immediately, check oil level and filter condition before restarting; test the sender only after level and filter are confirmed good |
| No CID/FMI code — COOLANT TEMPERATURE gauge in red zone | Engine coolant temperature has climbed past the safe operating range sensed at the water manifold | Low coolant level, plugged radiator core or screen, slipping or failed fan drive, faulty thermostat, or water pump wear | Reduce load and idle down, then shut down and let the engine cool before checking coolant level, radiator core, fan drive, and thermostat |
| No CID/FMI code — TORQUE CONVERTER OIL TEMPERATURE gauge in red zone / warning lamp | Torque converter oil is overheating, most often from prolonged stall or high-load operation | Continuous converter stall (pushing or loading against resistance), low converter oil level, plugged converter oil cooler, or worn converter | Ease off the load to bring the converter out of stall, idle to cool, then check converter oil level and inspect the cooler for restriction |
| No CID/FMI code — CHARGING SYSTEM warning lamp, or ammeter showing discharge | Alternator is not delivering charging current to the 24-volt electrical system | Broken or slipping alternator belt, failed alternator, bad voltage regulator, or a loose or corroded battery cable connection | Check belt tension and condition first, then test alternator output and battery cable connections |
| No CID/FMI code — AIR CLEANER SERVICE indicator (mechanical restriction gauge) | Intake air restriction across the dry-type air cleaner element has reached the service point | Dirty or clogged primary air filter element, or a damaged or loose intake hose giving a false restriction reading | Service or replace the air cleaner element and reset the indicator; inspect intake piping for leaks or damage |
| No CID/FMI code — GLOW PLUG / cold-start preheat indicator lamp | Indicates the intake air preheat circuit is energized for cold-weather starting | Normal during a cold start cycle; if the lamp fails to light or stays on, suspect a failed preheat relay, blown fuse, or open glow plug circuit | Allow the normal preheat cycle to complete before cranking in cold weather; if lamp behavior is abnormal, check the preheat relay, wiring, and individual glow plugs |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
988 attachments & work tools
General-purpose and rock buckets
Pin-on general-purpose buckets for this loader span roughly 3.8-5.3 m3 (5.0-7.0 cu yd) across widths from about 2.74 m to 3.27 m (108-129 in), matching the machine's original 5 cu yd rating that grew to 6 cu yd on later production. Spade-nose rock/rock-loading buckets cover a similar 3.8-4.6 m3 (5-6 cu yd) band in heavier steel for abrasive quarry and shot-rock loading.
Cutting edges and ground-engaging wear parts
Heavy-duty and light-duty bolt-on cutting-edge kits, plus separate bit-and-cutting-edge sets, are field-installed on the bucket lip to protect the base edge and restore digging performance as it wears. These are wear items sized to bucket width rather than standalone work tools.
Ripper-scarifier attachment
A rear-mounted ripper-scarifier arrangement bolts to its own mounting group and ties into a dedicated ripper hydraulic-cylinder and lines circuit rather than the loader's standard lift/tilt hydraulics. It is used to loosen packed or frozen material ahead of loading; fitting it requires the ripper cylinder and lines hardware, not just the shank.
Log fork and logging arrangement
A front-mounted log fork pairs with a carriage-and-clamp group and its own hydraulic lines for grabbing and stacking logs. A factory logging arrangement rated to roughly 35,000 lb (15,875 kg) payload bundles the fork, a reinforced lift-cylinder arrangement, hydraulic arrangement, and added counterweight as one package for forestry/mill yard use.
Auxiliary hydraulics and field conversion kits
Base machines run two-valve hydraulics for bucket curl/lift only; a 2-valve-to-3-valve field conversion kit adds the auxiliary circuit needed for clamp-, ripper-, or grapple-type tools. Companion valve groups (auxiliary relief, internal auxiliary, external kickout, lift detent/kickout) size and protect that extra circuit and add automatic bucket-positioning or dig-detent control.
Counterweights
Frame-mounted and bumper-mounted counterweight groups are offered in a few discrete weights, roughly 500-2,900 kg (1,100-6,450 lb), to rebalance the machine when running heavier front tools such as log forks or oversized buckets. Selection depends on which front attachment and hydraulic arrangement is fitted.
Coupler and mounting method
Work tools mount on the standard twin-pin loader linkage (lift arm plus tilt lever/link) shared by every bucket and fork in this class; this generation has no hydraulic quick-coupler. Special tools such as the ripper or log fork instead bolt to their own dedicated mounting or carriage group rather than using the bucket pins.
Cab and operator-environment configurations
Factory options include an open canopy, a semi-enclosed cab conversion with side curtains, or a fully enclosed cab, plus heater, defroster-fan, and front/rear wiper groups offered in 12-volt or 24-volt versions. These are ordered to match climate and duty cycle rather than being fitted across the board.
Cold-weather and protective options
An ether starting-aid group assists cold-weather starting, and protective covers are available for the fuel-tank cap, hydraulic-tank cap, and oil-filler cap, along with a dust-guard group for dusty operating sites. These are configuration options tied to climate and application rather than core work tools.
All 988 assemblies by section
Every catalogued assembly group for the Caterpillar 988. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
5k5821--988 Ripper-Scarifier Arrangement
| 3S***96 | Film | 1 |
| 4S***61 | Ripper Lines Group | 1 |
| 5J***56 | Hydraulic Cylinder Group; Cylinder Group | 2 |
1s2584 Alternator Assembly--24 Volt, 45 Ampere--Type 2
| 1S***84 | Alternator Assembly | 1 |
1s2584 Alternator Assembly--24 Volt, 45 Ampere --Type 1
| 1S***84 | Alternator Assembly | 1 |
9m4180 Alternator Group--24 Volt, 45 Ampere--Type 1
| 9M***80 | Alternator Group | 1 |
9m4180 Alternator Group--24 Volt, 45 Ampere--Type 2
| 9M***80 | Alternator Group | 1 |
9m4180 Alternator Group--24 Volt, 45 Ampere--Type 3
| 9M***80 | Alternator Group | 1 |
6j1733 Auxiliary Relief Valve Group
| 6J***33 | Auxiliary Relief Valve Group | 1 |
1v4359 Basic Wiper Group--12 Volt
| 1V***59 | Basic Wiper Group | 1 |
1s1876 Battery And Wiring Group--24 Volt--Top View--Part 2 Of 4
| 1S***76 | Battery And Wiring Group | 1 |
1s1876 Battery And Wiring Group--24 Volt--Top View--Part 1 Of 4
| 1S***76 | Battery And Wiring Group | 1 |
1s1876 Battery And Wiring Group--24 Volt--Part 4 Of 4
| 1S***76 | Battery And Wiring Group | 1 |
1s1876 Battery And Wiring Group--24 Volt--Side View--Part 3 Of 4
| 1S***76 | Battery And Wiring Group | 1 |
9j3141 Bit And Cutting Edge Group--Field Installation
| 9J***41 | Bit And Cutting Edge Group | 1 |
8j8168 Bit And Cutting Edge Group--Field Installation
| 8J***68 | Bit And Cutting Edge Group | 1 |
6k1360 General Purpose Bucket Assembly--6.00 Cu. Yd.--126" Wide
2s7622 Bracket Service Group
| 2S***22 | Bracket Service Group | 1 |
8k6572 General Purpose Bucket Assembly--6.5 Cu. Yd.--127.5" Wide
| 8K***72 | Bucket As | 1 |
4k9163 Bucket Assembly--5.50 Cu. Yd.--126" Wide
| 4K***63 | Bucket Assembly | 1 |
5k3539 Bucket Assembly--Rock Loading--6 Cu. Yd.--130" Wide
| 5K***39 | Bucket Assembly; Bucket Assembly--Rock Loading | 1 |
4k9160 Bucket Assembly--5 Cu. Yd.--108" Wide
| 4K***60 | Bucket Assembly | 1 |
4k9161 Bucket Assembly--Rock Loading--5 Cubic Yard--127" Wide
| 4K***61 | Bucket Assembly | 1 |
5k5241 Bucket Assembly--6.00 Cu. Yd.--126" Wide
| 5K***41 | Bucket Assembly | 1 |
4k9162 Bucket Assembly--5.50 Cu. Yd.--108" Wide
| 4K***62 | Bucket Assembly | 1 |
4k9164 Bucket Assembly--6.50 Cu. Yd.--126" Wide
| 4K***64 | Bucket Assembly | 1 |
4k999 Bucket Assembly--5 Cubic Yard--126" Wide
| 4K***99 | Bucket Assembly | 1 |
5k233 Cab Conversion Group--R.H. Side View-- Part 1 Of 2
| 5K***33 | Cab Conversion Group | 1 |
5k233 Cab Conversion Group--L.H. Side View-- Part 2 Of 2
| 5K***33 | Cab Conversion Group | 1 |
4k9076 Cab Group--R.H. Side View--Part 2 Of 3 --Type 2
| 4K***76 | Cab Group | 1 |
4k9076 Cab Group--L.H. Side View--Part 3 Of 3-- Type 2
| 4K***76 | Cab Group | 1 |
4k9076 Cab Group--L.H. Side View Part 3 Of 3--Type 1
| 4K***76 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 2--R.H. Side View--Part 2 Of 3
| 5K***36 | Cab Group | 1 |
4k9076 Cab Group--Front View--Part 1 Of 3 --Type 3
| 4K***76 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 3--R.H. Side View--Part 2 Of 3
| 5K***36 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 1 --R.H. Side View--Part 2 Of 3
| 5K***36 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 3--L.H. Side View--Part 3 Of 3
| 5K***36 | Cab Group | 1 |
4k9076 Cab Group--R.H. Side View--Part 2 Of 3-- Type 3
| 4K***76 | Cab Group | 1 |
4k9076 Cab Group--R.H. Side View Part 2 Of 3--Type 1
| 4K***76 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 2--Front View--Part 1 Of 3
| 5K***36 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 2--L.H. Side View--Part 3 Of 3
| 5K***36 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 1-- Front View--Part 1 Of 3
| 5K***36 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 1-- L.H. Side View--Part 3 Of 3
| 5K***36 | Cab Group | 1 |
4k9076 Cab Group--L.H. Side View--Part 3 Of 3 --Type 3
| 4K***76 | Cab Group | 1 |
5k236 Cab Group--Semi-Enclosed--Type 3--Front View--Part 1 Of 3
| 5K***36 | Cab Group | 1 |
4k9076 Cab Group--Front View Part 1 Of 3--Type 1
| 4K***76 | Cab Group | 1 |
4k9076 Cab Group--Front View--Part 1 Of 3 --Type 2
| 4K***76 | Cab Group | 1 |
4k9093 Canopy Panel Group--Type 2
| 4K***93 | Canopy Panel Group | 1 |
5k235 Canopy Panel Group--Type 1
| 5K***35 | Canopy Panel Group | 1 |
5k235 Canopy Panel Group--Type 2
| 5K***35 | Canopy Panel Group | 1 |
4k9093 Canopy Panel Group--Type 1
| 4K***93 | Canopy Panel Group | 1 |
4k7499 Carriage And Clamp Group
| 4K***99 | Carriage And Clamp Group | 1 |
5k3307 Conversion Group--Rock Bucket
| 5K***07 | Conversion Group | 1 |
5k1277 Counterweight Group--6,450 Pounds
| 5K***77 | Counterweight Group | 1 |
4k9878 Counterweight Group--1,120 Lbs.--Bumper Mounted
| 4K***78 | Counterweight Group | 1 |
4k9877 Counterweight Group--2,050 Lbs.--Frame Mounted
| 4K***77 | Counterweight Group | 1 |
2s3025 Protection Cover Group--Oil Filler Cap
| 2S***25 | Cover Group-Protection; Protection Cover Group | 1 |
5d1900 Protection Cover Group--Hydraulic Tank Cap
| 5D***00 | Cover Group-Protection; Protection Cover Group-- Hydraulic Tank Cap | 1 |
5k1753 Curtain Group--Semi-Enclosed Cab
| 5K***53 | Curtain Group | 1 |
7k1844 Cutting Edge Group--Heavy Duty--Field Installation
| 7K***44 | Cutting Edge Group | 1 |
7k2457 Cutting Edge Group--Light Duty--Field Installation
| 7K***57 | Cutting Edge Group | 1 |
4j7845 Cylinder Group--5.50" X 21.38"
| 4J***45 | Cylinder Group; Cylinder Group | 1 |
Cylinder Head Assembly--End View
4k9506 Defroster Fan Group--12 Volt--Type 1
| 4K***06 | Defroster Fan Group | 1 |
4k9506 Defroster Fan Group--12 Volt--Type 2
| 4K***06 | Defroster Fan Group | 1 |
4k9507 Defroster Fan Group--24 Volt--Type 1
| 4K***07 | Defroster Fan Group | 1 |
4k9507 Defroster Fan Group--24 Volt--Type 2
| 4K***07 | Defroster Fan Group | 1 |
2s6277 Differential--Torque Proportioning
| 2S***77 | Differential | 1 |
1s7629 Differential And Gear Group--No-Spin
| 1S***29 | Differential And Gear Group | 1 |
5s7501 Differential And Gear Group--Torque Proportioning
| 5S***01 | Differential And Gear Group | 1 |
2s294 Differential And Gear Group--No-Spin
| 2S***94 | Differential And Gear Group | 1 |
1s2418 Direct Electric Starting Arrangement--24 Volt--Factory Installation
| 1A***29 | Bolt (1-1/8") Tube Assembly To Transfer Drive Case | 2 |
| 1B***02 | Key-- Adapter To Compression Release Shaft | 1 |
| 1L***77 | Button-- Fuel Tank Hole In Hood | 2 |
9f740 Discharger
| 9F***40 | Discharger Group | 1 |
4k8965 Door Group--R.H.
| 4K***65 | Door Group | 1 |
4k8966 Door Group--L.H.
| 4K***66 | Door Group | 1 |
5k5791 Dust Guard Group
| 5K***91 | Dust Guard Group | 1 |
2s5029 Ether Starting Aid Group
| 2S***29 | Ether Starting Aid Group | 1 |
5j7170 External Kickout Valve Group
| 5J***70 | External Kickout Valve Group | 1 |
1s2270 Fender Group--R.H. Side View
| 1S***70 | Fender Group | 1 |
5k9901 Field Conversion Arrangement--2 Valve To 3 Valve
| 4K***74 | Field Conversion Group | 1 |
| 4K***50 | Hydraulic Valve Control Group | 1 |
| 5K***99 | Rear Hydraulic Lines Group | 1 |
4k1273 Field Conversion Arrangement--2 Valve To 3 Valve
| 4K***73 | Field Conversion Arrangement | 1 |
| 4K***74 | Field Conversion Group | 1 |
| 4K***28 | Lines Group; Front Hydraulic Lines Group | 1 |
5k7564 Field Conversion Group--High Pressure Roller Detents--Part 1 Of 2
| 5K***64 | Field Conversion Group | 1 |
4k1274 Field Conversion Group--2 Valve To 3 Valve
| 4K***74 | Field Conversion Group | 1 |
6j4697 Field Conversion Group
| 6J***97 | Field Conversion Group | 1 |
7k7038 Field Conversion Group
| 7K***38 | Field Conversion Group | 1 |
5k7564 Field Conversion Group--High Pressure Roller Detents--Part 2 Of 2
| 5K***64 | Field Conversion Group | 1 |
Flywheel
1s4039 Front Final Drive, Wheel And Brake Group--Type 2
| 1S***39 | Front Final Drive, Wheel And Brake Group | 1 |
1s4039 Front Final Drive, Wheel And Brake Group--Type 1
| 1S***39 | Front Final Drive, Wheel And Brake Group | 1 |
4k7494 Front Hydraulic Lines Group--Top View
| 4K***94 | Front Hydraulic Lines Group; Hydraulic Lines Group-- Front | 1 |
4k9091 Front Panel Group
| 4K***91 | Front Panel Group | 1 |
9k2374 General Purpose Bucket Assembly--7.00 Cu. Yd.--128.75" Wide
| 9K***74 | General Purpose Bucket Assembly | 1 |
7k6723 General Purpose Bucket Assembly--6 Cu. Yd.--126" Wide
| 7K***23 | General Purpose Bucket Assembly | 1 |
9k3715 General Purpose Bucket Assembly--6.00 Cu. Yd.--128.75" Wide
| 9K***15 | General Purpose Bucket Assembly | 1 |
6k1355 General Purpose Bucket Assembly--5.5 Cu. Yd.--126" Wide
| 6K***55 | General Purpose Bucket Assembly | 1 |
6k1455 General Purpose Bucket Assembly
| 6K***55 | General Purpose Bucket Assembly | 1 |
7k6720 General Purpose Bucket Assembly--6.5 Cu. Yd.--126" Wide
| 7K***20 | General Purpose Bucket Assembly | 1 |
6k1365 General Purpose Bucket Assembly--6.5 Cu. Yd.--126" Wide
| 6K***65 | General Purpose Bucket Assembly | 1 |
7k6722 General Purpose Bucket Assembly--5.5 Cu. Yd.--126" Wide
8k6540 General Purpose Bucket Assembly--5.5 Cu. Yd.--127.5" Wide
| 8K***40 | General Purpose Bucket Assembly | 1 |
7k6721 General Purpose Bucket Assembly--5.5 Cu. Yd.--108" Wide
| 7K***21 | General Purpose Bucket Assembly | 1 |
8k6550 General Purpose Bucket Assembly--6.00 Cu. Yd.--127.5" Wide
| 8K***50 | General Purpose Bucket Assembly | 1 |
4m308 Glow Plug And Wiring Group--24 Volt--Type 1
| 4M***08 | Glow Plug And Wiring Group | 1 |
4m308 Glow Plug And Wiring Group--24 Volt--Type 2
| 4M***08 | Glow Plug And Wiring Group | 1 |
8f9866 Grease Gun--Type 1
| 8F***66 | Grease Gun As | 1 |
8f9866 Grease Gun--Type 2
| 8F***66 | Grease Gun As | 1 |
8m9858 Tool Group
| 8M***58 | Hand Tool Group | 1 |
4k9508 Heater Group--12 Volt
| 4K***08 | Heater Group | 1 |
4k9509 Heater Group--24 Volt
| 4K***09 | Heater Group | 1 |
3k9066 Hot Water Heater--12 Volt
| 3K***66 | Hot Water Heater | 1 |
5h1526 Hot Water Heater--24 Volt
| 5H***26 | Hot Water Heater Group | 1 |
4k6949 Hydraulic Arrangement--Factory Installation
| 4J***49 | Tank And Valve Group; Hydraulic Tank And Valve Group | 1 |
| 4K***28 | Lines Group; Front Hydraulic Lines Group | 1 |
| 4K***49 | Hydraulic Arrangement | 1 |
5j156 Cylinder Group--5.5" Bore X 19" Stroke--2 Groups Required--Type 1
| 5J***56 | Hydraulic Cylinder Group; Cylinder Group | 1 |
5j156 Cylinder Group--5.5" Bore X 19" Stroke--2 Required--Type 3
| 5J***56 | Hydraulic Cylinder Group; Cylinder Group | 1 |
5j156 Cylinder Group--5.5" Bore X 19" Stroke--2 Required--Type 2
| 5J***56 | Hydraulic Cylinder Group; Cylinder Group | 1 |
5k9396 Hydraulic Lines Group--Type 2
| 5K***96 | Hydraulic Lines Group | 1 |
5k702 Hydraulic Lines Group
| 5K***02 | Hydraulic Lines Group | 1 |
5k9396 Hydraulic Lines Group--Type 1
| 5K***96 | Hydraulic Lines Group | 1 |
5j5930 Hydraulic Pump Assembly--Type 1
| 5J***30 | Hydraulic Pump Assembly | 1 |
5j5930 Hydraulic Pump Assembly--Type 2
| 5J***30 | Hydraulic Pump Assembly | 1 |
5j4275 Hydraulic Pump Assembly
| 5J***75 | Hydraulic Pump Assembly | 1 |
4k6950 Hydraulic Valve Control Group
| 4K***50 | Hydraulic Valve Control Group | 1 |
4j7078 Internal Auxiliary Valve Group
| 4J***78 | Internal Auxiliary Valve Group | 1 |
5j7631 Internal Field Conversion Group
| 5J***31 | Internal Field Conversion Group | 1 |
4k4895 Swivel Joint Group--Type 2
| 4K***95 | Joint Group-Swivel | 1 |
4k4895 Swivel Joint Group--Type 1
| 4K***95 | Joint Group-Swivel | 1 |
7m7147 Stop And Tail Lamp Assembly--24 Volt
| 7M***47 | Lamp As-Stop & Tail | 1 |
1m1882 Flood Lamp Assembly--24 Volt
| 1M***82 | Lamp Group | 1 |
1m3379 Head Lamp Assembly--24 Volt
| 1M***79 | Lamp Group | 1 |
1m3387 Dash Lamp Assembly--24 Volt
| 1M***87 | Lamp Group | 1 |
6k4803 Lift Arm Group
| 6K***03 | Lift Arm Group | 1 |
3s399 Lift Cylinder And Pump Arrangement
| 3S***99 | Lift Cylinder And Pump Arrangement | 1 |
| 4J***77 | Lift Cylinder Group | 2 |
| 5J***75 | Hydraulic Pump Assembly | 1 |
4j7377 Lift Cylinder Group--8.25" Bore X 39.50" Stroke--2 Groups Required
| 4J***77 | Lift Cylinder Group | 1 |
5j7630 Lift Detent Valve Group
| 5J***30 | Lift Detent Valve Group | 1 |
5k5694 Lift Kickout And Bucket Positioner Lines Conversion Group
| 5K***94 | Lift Kickout And Bucket Positioner Lines Conversion Group | 1 |
1s7829 Lighting System Group--12 Volt
| 1S***29 | Lighting System Group | 1 |
1s2307 Lighting System Group--24 Volt--Side View
| 1S***07 | Lighting System Group | 1 |
1s7828 Lighting System Group--24 Volt
| 1S***28 | Lighting System Group | 1 |
4k5428 Lines Group--Part 2 Of 2
| 4K***28 | Lines Group; Front Hydraulic Lines Group | 1 |
4k5428 Lines Group--Part 1 Of 2
| 4K***28 | Lines Group; Front Hydraulic Lines Group | 1 |
4k7500 Log Fork Arrangement
| 4J***45 | Cylinder Group; Cylinder Group | 2 |
| 4K***94 | Front Hydraulic Lines Group; Hydraulic Lines Group-- Front | 1 |
| 4K***99 | Carriage And Clamp Group | 1 |
5k3130 Logging Arrangement--35,000 Pounds
| 4K***49 | Hydraulic Arrangement | 1 |
| 4K***00 | Log Fork Arrangement | 1 |
| 4K***18 | Lift Cylinder Arrangement | 1 |
2m1464 Electric Starting Motor Assembly--24 Volt--Part 2 Of 2--Type 2
| 2M***64 | Motor Assembly | 1 |
2m1464 Electric Starting Motor Assembly--24 Volt--Part 1 Of 2--Type 2
| 2M***64 | Motor Assembly | 1 |
2m1464 Electric Starting Motor Assembly--24 Volt--Part 2 Of 2--Type 1
| 2M***64 | Motor Assembly | 1 |
2m1464 Electric Starting Motor Assembly--24 Volt--Part 1 Of 2--Type 1
| 2M***64 | Motor Assembly | 1 |
Name Plates, Tool And Transfers
| 1S***90 | Plate-- Lubrications Instructions | 1 |
| 1S***96 | Transfer Group | 1 |
| 1S***12 | Plate; Transportation Notice Below Cab Door Sil Near L.H. Side Of Platform Support | 1 |
5s8033 Protection Cover Group--Fuel Tank Cap
| 5S***33 | Protection Cover Group | 1 |
1s6307 Protection Cover Group--Fuel Tank Cap
| 1S***07 | Protection Cover Group | 1 |
1s4153 Rain Cap Group--Starting Engine
| 1S***53 | Rain Cap Group | 1 |
1s4040 Rear Final Drive, Wheel And Brake Group--Type 1
| 1S***40 | Rear Final Drive, Wheel And Brake Group | 1 |
1s4040 Rear Final Drive, Wheel And Brake Group--Type 2
| 1S***40 | Rear Final Drive, Wheel And Brake Group | 1 |
5k9899 Rear Hydraulic Lines Group
| 5K***99 | Rear Hydraulic Lines Group | 1 |
4k9512 Rear Window Wiper Group--12 Volt
| 4K***12 | Rear Window Wiper Group | 1 |
4k9513 Rear Window Wiper Group--24 Volt
| 4K***13 | Rear Window Wiper Group | 1 |
Replacement Parts For Chain Armor
5k445 Ripper-Scarifier Group--Type 1
| 5K***45 | Ripper Ar-Basic; Ripper--Scarifier Group | 1 |
5k445 Ripper-Scarifier Group--Type 2
| 5K***45 | Ripper Ar-Basic; Ripper--Scarifier Group | 1 |
4s7861 Ripper Lines Group
| 4S***61 | Ripper Lines Group | 1 |
5k5678 Ripper Mounting Group
| 5K***78 | Ripper Mounting Group | 1 |
5k447 Ripper Tooth Group
| 5K***47 | Ripper Tooth Group | 1 |
6k4984 Rock Loader Arrangement
| 5K***39 | Bucket Assembly; Bucket Assembly--Rock Loading | 1 |
| 6K***03 | Lift Arm Group | 1 |
| 6K***84 | Rock Loader Arrangement | 1 |
5k448 Scarifier Tooth Group--11 Teeth
| 5K***48 | Scarifier Tooth Group | 1 |
2m2832 Seat Belt Group
| 2M***32 | Seat Belt Group | 1 |
9k1213 Shaft And Link Assembly
| 9K***13 | Shaft & Link As | 1 |
4k9936 Sliding Window Assembly
| 4K***36 | Sliding Window Assembly | 1 |
6k1444 Spill Plate Extension Group
| 6K***44 | Spill Plate Extension Group | 1 |
4k3964 Spill Plate Extension Group
| 4K***64 | Spill Plate Extension Group | 1 |
5k3635 Spill Plate Extension Group
| 5K***35 | Spill Plate Extension Group | 1 |
1m7039 Electric Starter Group--24 Volt
| 1M***39 | Starter Group-Electric; Electric Starter Group | 1 |
5k5736 Support Group
| 5K***36 | Support Group | 1 |
4m1812 Solenoid Switch Assembly
| 4M***12 | Switch As-Solenoid | 1 |
4j6949 Tank And Valve Group--3 Valve--Part 2 Of 3--Type 2
| 4J***49 | Tank And Valve Group; Hydraulic Tank And Valve Group | 1 |
4j6949 Tank And Valve Group--3 Valve--Part 3 Of 3--Type 2
| 4J***49 | Tank And Valve Group; Hydraulic Tank And Valve Group | 1 |
4j6949 Tank And Valve Group--3 Valve--Part 2 Of 3--Type 1
| 4J***49 | Tank And Valve Group; Hydraulic Tank And Valve Group | 1 |
4j6949 Tank And Valve Group--3 Valve--Part 1 Of 3--Type 1
| 4J***49 | Tank And Valve Group; Hydraulic Tank And Valve Group | 1 |
4j6949 Tank And Valve Group--3 Valve--Part 3 Of 3--Type 1
| 4J***49 | Tank And Valve Group; Hydraulic Tank And Valve Group | 1 |
4j6949 Tank And Valve Group--3 Valve--Part 1 Of 3--Type 2
| 4J***49 | Tank And Valve Group; Hydraulic Tank And Valve Group | 1 |
5j7629 Tilt Detent Valve Group
| 5J***29 | Tilt Detent Valve Group | 1 |
Tire And Mounting--29.50 X 29 Tubeless Tires
5s690 Tire Chain Armor Arrangement
| 5S***90 | Tire Chain Armor Arrangement | 1 |
| 5S***92 | Tire Chain Armour Group | 2 |
5s691 Tire Chain Armor Arrangement
| 5S***91 | Tire Chain Armor Arrangement | 1 |
| 5S***92 | Tire Chain Armour Group | 4 |
3s9153 Tire, Wheel And Fender Arrangement
| 1S***70 | Fender Group | 1 |
| 1S***39 | Front Final Drive, Wheel And Brake Group | 2 |
| 1S***40 | Rear Final Drive, Wheel And Brake Group | 2 |
Tire, Wheel And Fender Arrangement--29.50 X 29 Tubeless Tires
| 1S***70 | Fender Group | 1 |
| 1S***39 | Front Final Drive, Wheel And Brake Group | 2 |
| 1S***40 | Rear Final Drive, Wheel And Brake Group | 2 |
1s2271 Tire, Wheel And Fender Arrangement--29.50 X 29 Tubeless Tires
| 1S***70 | Fender Group | 1 |
| 1S***71 | Tire, Wheel And Fender Arrangement | 1 |
| 1S***39 | Front Final Drive, Wheel And Brake Group | 2 |
5s6021 Tool Group--Replaces 8m9858
| 5S***21 | Tool Group | 1 |
7k419 Tooth Group--Short Tip
| 7K***19 | Tooth Group | 1 |
6k8280 Tooth Group--Short Tip
| 6K***80 | Tooth Group | 1 |
7k418 Tooth Group--Long Tip
| 7K***18 | Tooth Group | 1 |
4k9377 Tooth Group--Long Tip
| 4K***77 | Tooth Group | 1 |
5k7583 Tooth Group
| 5K***83 | Tooth Group | 1 |
4k7351 Tooth Group--Long Tip
| 4K***51 | Tooth Group | 1 |
6k8281 Tooth Group--Long Tip
| 6K***81 | Tooth Group | 1 |
6k8282 Tooth Group--Long Tip
| 6K***82 | Tooth Group | 1 |
5k7584 Tooth Group
| 5K***84 | Tooth Group | 1 |
6k8283 Tooth Group--Short Tip
| 6K***83 | Tooth Group | 1 |
1s6890 Transmission Guard Group
| 1S***90 | Transmission Guard Group | 1 |
1v4495 Windshield Wiper Group--12 Volt--Field Installation
| 1V***95 | Windshield Wiper Group | 1 |
4k9511 Windshield Wiper Group--24 Volt
| 4K***11 | Windshield Wiper Group | 1 |
4k9510 Windshield Wiper Group--12 Volt--Type 2
| 4K***10 | Windshield Wiper Group | 1 |
1v4481 Windshield Wiper Group--24 Volt--Field Installation
| 1V***81 | Windshield Wiper Group | 1 |
4k9510 Windshield Wiper Group--12 Volt--Type 1
| 4K***10 | Windshield Wiper Group | 1 |
4k9471 Wiper Assembly--24 Volt
| 4K***71 | Wiper Assembly | 1 |
9k1240 Wiper Assembly--12 Volt
| 9K***40 | Wiper Assembly | 1 |
4k9472 Wiper Assembly--12 Volt
| 4K***72 | Wiper Assembly | 1 |
1v4360 Wiper Group
| 1V***60 | Wiper Group | 1 |
Wiring Diagram--24 Volt System
Diesel Engine
Air Cleaner--Top View
7m914 Air Filter Indicator Group
| 7M***14 | Air Filter Service Indicator Group | 1 |
Breather
Camshaft
Camshaft (4m298 N/S)
| 4M***98 | Camshaft | 1 |
Camshaft Drive
Connecting Rod And Piston--6 Required
Crankshaft (4m4193 N/S)
| 4M***93 | Crankshaft | 1 |
Crankshaft Bearing Replacement
Crankshaft Bearing Replacement Groups
Cylinder Block And Covers--End View -Part 2 Of 2
Cylinder Block And Covers--Side View -Part 1 Of 2
Cylinder Block And Covers--Side View- Part 1 Of 3
Cylinder Block And Covers--Rear View--Part 2 Of 3
Cylinder Block And Covers--Side View- Part 1 Of 2
Cylinder Block And Covers--Front View-Part 3 Of 3
2s1803 Cylinder Block Assembly
| 2S***03 | Cylinder Block Assembly | 1 |
Cylinder Head And Valve Mechanism--End View -Part 2 Of 2
Cylinder Head And Valve Mechanism--Side View -Part 1 Of 2
1p1146 Fan Drive Group
| 1P***46 | Drive Group-Fan; Fan Drive Group | 1 |
1m5061 Tachometer Drive Group
| 1M***61 | Drive Group-Tachometer | 1 |
Drive Pulley And Damper
Engine Oil Cooler
Engine Support
Exhaust Extension
Fan And Drive
2s2480 Fan Drive Clutch Assembly
| 2S***80 | Fan Drive Clutch Assembly | 1 |
9m8437 Fan Drive Clutch Assembly
| 9M***37 | Fan Drive Clutch Assembly | 1 |
1p1365 Fan Drive Group--Field Installation
| 1P***65 | Fan Drive Group | 1 |
Fan Guard
9m3223 Oil Filter Group
| 9M***23 | Filter Group-Engine Oil; Oil Filter Group | 1 |
8h7204 Fuel Filter Group
| 8H***04 | Filter Group-Fuel | 1 |
Flywheel
Fuel Filter
Fuel Injection Pump Drive
Fuel Injection Valves And Lines
Fuel Pump Housing
5m6488 Fuel Transfer Pump Group
| 5M***88 | Fuel Transfer Pump Group | 1 |
Gasket Kits
| 1S***48 | Valve Grinding; -Serial No. 43e423 To 43e510 Inclusive | 0 |
| 1S***49 | Diesel Engine Basic; -Serial No. 43e423 To 43e510 Inclusive | 0 |
| 1S***51 | Diesel Engine Supplementary | 0 |
Gauges And Lines--As Viewed From Left Hand Side Of Machine
Governor Control
9m3681 Governor Group--With Rack Limiter--Part 2 Of 3
| 9M***81 | Governor Group | 1 |
9m3681 Governor Group--With Rack Limiter--Part 1 Of 3
| 9M***81 | Governor Group | 1 |
9m3681 Governor Group--With Rack Limiter--Part 3 Of 3
| 9M***81 | Governor Group | 1 |
Hydraulic Pump Drive
Instrument Console
Water Lines (1s3866 N/S)
| 1S***66 | Lines Group-Water; Water Lines Group | 1 |
Manifolds--Side View -Part 1 Of 2
Manifolds--End View- Part 2 Of 2
Manifolds--End View -Part 2 Of 2
9m3202 Oil Filter Base Assembly--Top View
| 9M***02 | Oil Filter Base Assembly | 1 |
Oil Lines--As Viewed From Rear Of Engine
Oil Lines (1s9438 N/S)
| 1S***38 | Oil Lines | 1 |
4m8026 Oil Pump Assembly
| 4M***26 | Oil Pump Assembly | 1 |
2p7823 Prescreener Group
| 2P***23 | Prescreener Group | 1 |
Primary Fuel Filter And Lines (9m3648 N/S)
| 9M***48 | Primary Fuel Filter And Lines | 1 |
1m7022 Fuel Priming Pump Group
| 1M***22 | Pump Group-Fuel Priming | 1 |
Radiator--As Viewed From Rear Of Engine- Part 1 Of 2
Radiator--As Viewed From Rear Of Engine -Part 1 Of 2
Radiator--As Viewed From Left Hand Side Of Engine- Part 2 Of 2
1p1073 Radiator Core Protective Grid Group
| 1P***73 | Radiator Core Protection Grid Group; Radiator Core Protective Grid Group | 1 |
1p1074 Radiator Core Protection Grid Group--Field Installation
| 1P***73 | Radiator Core Protection Grid Group; Radiator Core Protective Grid Group | 1 |
| 1P***74 | Radiator Core Protection Grid Group | 1 |
| 1P***65 | Fan Drive Group | 1 |
Radiator Guard (6m1009 N/S)
| 6M***09 | Radiator Guard | 1 |
4s9643 Replacement Crankshaft Gear Group
| 4S***43 | Replacement Crankshaft Gear Group | 1 |
4m1245 Service Meter And Tachometer Drive Group
| 4M***45 | Service Meter And Tachometer Drive Group | 1 |
9m8539 Service Meter Group
| 9M***39 | Service Meter Group | 1 |
Torque Converter Oil Cooler
Torque Converter Oil Pump Drive
3s1414 Turbocharger Assembly
| 3S***14 | Turbocharger Assembly | 1 |
1s9162 Turbocharger Assembly
| 1S***62 | Turbocharger Assembly | 1 |
Water Lines
2r231 Water Lines Group
| 2R***31 | Water Lines Group | 1 |
1s8755 Water Pump Assembly
| 1S***55 | Water Pump Assembly | 1 |
2s7209 Water Pump Assembly
| 2S***09 | Water Pump Assembly | 1 |
Hydraulic Control
4j7321 Check And Unloading Valve Group
| 4J***21 | Check And Unloading Valve Group | 1 |
3j5320 Control Valve Group--Top View- Part 2 Of 2
| 3J***20 | Control Valve Group | 1 |
3j5320 Control Valve Group--Top View -Part 2 Of 2
| 3J***20 | Control Valve Group | 1 |
3j5320 Control Valve Group--Side View- Part 1 Of 2
| 3J***20 | Control Valve Group | 1 |
3j5320 Control Valve Group--Side View -Part 1 Of 2
| 3J***20 | Control Valve Group | 1 |
Cooler Lines And Valve
4j3558 Detent Lift Valve Group
| 4J***58 | Detent Lift Valve Group | 1 |
4j3559 Detent Tilt Valve Group
| 4J***59 | Detent Tilt Valve Group | 1 |
3j8877 Differential Tilt Relief Valve Group
| 3J***77 | Differential Tilt Relief Valve Group | 1 |
5j8366 Element And Oil Level Indicator Body Group
| 5J***66 | Element And Oil Level Indicator Body Group | 1 |
5j3206 Flow Control And Relief Valve Group
| 5J***06 | Flow Control And Relief Valve Group | 1 |
Hand Control
3k9697 Hydraulic Oil Filter Group
| 3K***97 | Hydraulic Oil Filter Group | 1 |
5j9960 Hydraulic Oil Filter Indicator Group--Field Installation
| 5J***60 | Hydraulic Oil Filter Indicator Group | 1 |
Hydraulic Pump And Lines--As Viewed From Front Left Hand Side Of Machine--Part 2 Of 2
Hydraulic Pump And Lines--As Viewed From Front Left Hand Side Of Machine--Part 1 Of 2
3k9539 Hydraulic Pump Assembly
| 3K***39 | Hydraulic Pump Assembly | 1 |
Hydraulic Tank And Valve--2 Valve--As Viewed From Rear Of Machine--Part 2 Of 3
Hydraulic Tank And Valve--2 Valve--As Viewed From Rear Of Machine--Part 1 Of 3
Hydraulic Tank And Valve--2 Valve--As Viewed From Right Hand Side Of Machine--Part 3 Of 3
4j595 Make-Up Valve Group
| 4J***95 | Make-Up Valve Group | 1 |
3s1728 Radiator Hydraulic Tank And Cooler Lines Arrangement--Field Installation
| 3S***28 | Radiator Hydraulic Tank And Cooler Lines Arrangement | 1 |
4j4120 Relief Valve Group
| 4J***20 | Relief Valve Group | 1 |
3j8878 Tilt Relief Valve Group
| 3J***78 | Tilt Relief Valve Group | 1 |
Starting System
1s2585 Alternator Assembly--12 Volt, 55 Ampere
| 1S***85 | Alternator Assembly | 1 |
9m6517 Alternator Group--12 Volt, 55 Ampere
| 9M***17 | Alternator Group | 1 |
Battery And Wiring--12 Volt--As Viewed From Rear Right Hand Side Of Machine--Part 3 Of 3
Battery And Wiring--12 Volt--As Viewed From Rear Right Hand Side Of Machine--Part 1 Of 3
Battery And Wiring--12 Volt--As Viewed From Rear Right Hand Side Of Machine--Part 2 Of 3
Battery And Wiring Diagram--12 Volt System
Camshaft And Governor
9m3171 Carburetor Assembly
| 9M***71 | Carburetor Assembly | 1 |
9m4663 Clutch Group
| 9M***63 | Clutch Group | 1 |
Connecting Rod And Piston--2 Required
Crankshaft
Cylinder Block, Cylinder Head And Valve Mechanism--Part 2 Of 2
Cylinder Block, Cylinder Head And Valve Mechanism--Part 1 Of 2
2m6646 Dash Lamp Assembly--12 Volt
| 2M***46 | Dash Lamp Assembly | 1 |
7m7793 Electric Starter Group--12 Volt--Type 1
| 7M***93 | Electric Starter Group | 1 |
7m7793 Electric Starter Group--12 Volt--Type 2
| 7M***93 | Electric Starter Group | 1 |
9m4664 Engine Mounted Control Group
| 9M***64 | Engine Mounted Control 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 |
9m8895 Fuel System Group
| 9M***95 | Fuel System Group | 1 |
2m4166 Head Lamp Assembly--12 Volt
| 2M***66 | Head Lamp Assembly | 1 |
9h6203 Ignition System Group
| 9H***03 | Ignition System Group | 1 |
Lighting System--12 Volt--Front Half -Part 1 Of 2
Lighting System--12 Volt--Rear Half- Part 2 Of 2
Lighting System Wiring Diagram
8m9145 Magneto Assembly
| 8M***45 | Magneto Assembly | 1 |
1s3350 Magneto Assembly
| 1S***50 | Magneto Assembly | 1 |
9m4847 Manifold, Carburetor And Air Cleaner Group
| 9M***47 | Manifold, Carburetor And Air Cleaner Group | 1 |
8m2573 Manual Starting Crank Group
| 8M***73 | Manual Starting Crank Group | 1 |
1m6935 Oil Line Group
| 1M***35 | Oil Line Group; Oil Lines Group | 1 |
9m1713 Oil Pump Assembly
| 9M***13 | Oil Pump Assembly | 1 |
8m614 Starter Pinion Group
| 8M***14 | Starter Pinion Group | 1 |
4k1425 Starting Engine Control Group--Part 1 Of 2
| 4K***25 | Starting Engine Control Group | 1 |
4k1425 Starting Engine Control Group--Part 2 Of 2
| 4K***25 | Starting Engine Control Group | 1 |
Starting Engine Support
3d7674 Stop And Tail Lamp Assembly--12 Volt
| 3D***74 | Stop And Tail Lamp Assembly | 1 |
7h7290 Disconnect Switch Assembly
| 7H***90 | Switch As-Disconnect | 1 |
1s2211 Wiring Harness
| 1S***46 | Wiring Harness | 1 |
Transmission And Chassis
4j4984 Accumulator Charging Valve Group
| 4J***84 | Accumulator Charging Valve Group | 1 |
5j2166 Accumulator Charging Valve Group
| 5J***66 | Accumulator Charging Valve Group | 1 |
4j3605 Accumulator Group
| 4J***05 | Accumulator Group | 1 |
9m2203 Brake Adjuster Assembly
| 9M***03 | Brake Adjuster Assembly | 1 |
Brake Control--Rear View
Brake Lines--As Viewed From Front Left Hand Side Of Machine--Part 4 Of 4
Brake Lines--As Viewed From Front Left Hand Side Of Machine--Part 2 Of 4
Brake Lines--As Viewed From Front Left Hand Side Of Machine--Part 3 Of 4
Brake Lines--As Viewed From Front Left Hand Side Of Machine--Part 1 Of 4
5j2050 Brake Valve Group
| 5J***50 | Brake Valve Group | 1 |
4j8974 Brake Valve Group
| 4J***74 | Brake Valve Group | 1 |
Bumper And Drawbar
Dash--R.H. End View
Differential--Torque Proportioning
2s2126 Differential And Gear Group
| 2S***26 | Differential And Gear Group | 1 |
5s7501 Differential And Gear Group--Torque Proportioning
| 5S***01 | Differential And Gear Group | 1 |
1s1874 Differential And Gear Group
| 1S***74 | Differential And Gear Group | 1 |
Drive Shaft--As Viewed From Right Hand Side Of Machine
Drive Shaft--R.H. Side View
4k710 Drive Shaft Assembly--Front
| 4K***10 | Drive Shaft Assembly | 1 |
3k9781 Drive Shaft Assembly--Intermediate
| 3K***81 | Drive Shaft Assembly | 1 |
Fenders
5j9970 Field Conversion Group
| 5J***70 | Field Conversion Group | 1 |
Floor Plates--Top View
Front Axle Housing
Front Differential And Bevel Gear
Front Final Drive, Wheel And Brake--26.50 X 29 Tubeless Tires--2 Required
Front Frame
Fuel System
9m8714 Gear And Housing Group
| 9M***14 | Gear And Housing Group | 1 |
Hood And Firewall
4j6569 Hydraulic Steering Pump Assembly
| 4J***69 | Hydraulic Steering Pump Assembly | 1 |
1t520 Hydraulic Torque Converter Assembly
| 1T***20 | Hydraulic Torque Converter Assembly | 1 |
Ladder And Grab Iron
2s1485 Lubrication Relief Valve Group
| 2S***85 | Lubrication Relief Valve Group | 1 |
2s626 Lubrication Relief Valve Group
| 2S***26 | Lubrication Relief Valve Group | 1 |
8m6363 Neutralizer Valve Group
| 8M***63 | Neutralizer Valve Group | 1 |
2s1443 Neutralizer Valve Group
| 2S***43 | Neutralizer Valve Group | 1 |
2s154 Oil Pump Group
| 2S***54 | Oil Pump Group | 1 |
3k6559 Parking Brake Assembly
| 3K***59 | Parking Brake Assembly | 1 |
Parking Brake Control
Planetary Transmission--Part 2 Of 2
Planetary Transmission--Part 1 Of 2
Platform Support--Top View
8m6377 Pressure Control Group
| 8M***77 | Pressure Control Group | 1 |
2s454 Pressure Control Group
| 2S***54 | Pressure Control Group | 1 |
1p2619 Pressure Control Group
| 1P***19 | Pressure Control Group | 1 |
1s9996 Range Transmission Arrangement
| 1S***96 | Range Transmission Arrangement | 1 |
Rear Axle Housing And Trunnion--Part 2 Of 2
Rear Axle Housing And Trunnion--Part 1 Of 2
Rear Differential And Bevel Gear
Rear Final Drive, Wheel And Brake--26.50 X 29 Tubeless Tires--2 Required
Rear Frame
2s624 Relief Valve Group
| 2S***24 | Relief Valve Group | 1 |
2s1390 Relief Valve Group
| 2S***90 | Relief Valve Group | 1 |
4j4087 Rotary Actuator Housing Group
| 4J***87 | Rotary Actuator Housing Group | 1 |
4j8973 Rotary Actuator Housing Group
| 4J***73 | Rotary Actuator Housing Group | 1 |
8m6334 Safety Reset And Converter Hold Valve Group
| 8M***34 | Safety Reset And Converter Hold Valve Group | 1 |
Seat (1s4502 N/S)
3k8461 Seat Assembly
| 3K***61 | Seat Group; Basic Seat Group--Static | 1 |
9m4351 Selector Valve Group
| 9M***51 | Selector Valve Group | 1 |
3j6943 Steering Cylinder Group--5" X 28.78"--2 Groups Required
| 3J***43 | Steering Cylinder Group | 1 |
5j9909 Steering Filter Group
| 5J***09 | Steering Filter Group | 1 |
Steering Gear And Wheel
Steering Lines--Top View -Part 2 Of 2
Steering Lines--As Viewed From Rear Right Hand Side Of Machine--Part 1 Of 3
Steering Lines--As Viewed From Rear Right Hand Side Of Machine--Part 3 Of 3
Steering Lines--As Viewed From Rear Right Hand Side Of Machine--Part 2 Of 3
Steering Lines--As Viewed From Right Hand Side Of Machine -Part 1 Of 2
Steering Mechanism--Part 2 Of 2
Steering Mechanism--Part 1 Of 2
5s4 Steering System Filter Group--Field Installation
| 5S***04 | Steering System Filter Group | 1 |
5s5 Steering System Filter Group--Field Installation
| 5S***05 | Steering System Filter Group | 1 |
5j4934 Steering Valve Group--Part 1 Of 2
| 5J***34 | Steering Valve Group | 1 |
4j5352 Steering Valve Group--Part 1 Of 2
| 4J***52 | Steering Valve Group | 1 |
4j5352 Steering Valve Group--Part 2 Of 2
| 4J***52 | Steering Valve Group | 1 |
5j4934 Steering Valve Group--Part 2 Of 2
| 5J***34 | Steering Valve Group | 1 |
Torque Converter
Tractor Guard
Transfer Gears--As Viewed From Front Of Machine- Part 1 Of 2
Transfer Gears--As Viewed From Right Hand Side Of Machine- Part 2 Of 2
Transfer Gears--As Viewed From Right Hand Side Of Machine -Part 2 Of 2
Transfer Gears--As Viewed From Front Of Machine -Part 1 Of 2
Transmission Control--As Viewed From Right Hand Side Of Machine
9m3699 Transmission Filter Group
| 9M***99 | Transmission Filter Group | 1 |
Transmission Hydraulic Control--Top View- Part 1 Of 2
Transmission Hydraulic Control--Top View -Part 1 Of 2
Transmission Hydraulic Control--As Viewed From Rear Of Machine -Part 2 Of 2
Transmission Hydraulic Control--As Viewed From Rear Of Machine-Part 2 Of 2
4j4007 Transmission Neutralizer Valve Group
| 4J***07 | Transmission Neutralizer Valve Group | 1 |
Transmission Pump And Lines--As Viewed From Right Hand Side Of Machine--Part 2 Of 2
Transmission Pump And Lines--As Viewed From Right Hand Side Of Machine--Part 1 Of 2
9h5108 Universal Joint Assembly
| 9H***08 | Universal Joint Assembly | 1 |
5m7962 Universal Joint Assembly
| 5M***62 | Universal Joint Assembly | 1 |
1s8754 Universal Joint Assembly
| 1S***54 | Universal Joint Group | 1 |
Wheel Brake
Traxcavator
Bucket Control
Bucket Kickout
Bucket Positioner And Indicator--Top View
7k4056 Cam Group
| 7K***56 | Cam Group | 1 |
Counterweight--1,120 Pounds
4j6922 Lift Cylinder Group--7.25" Bore X 39.50" Stroke--2 Groups Required
| 4J***22 | Lift Cylinder Group | 1 |
Lift Cylinder Lines--Part 2 Of 2
Lift Cylinder Lines--Part 1 Of 2
6k9053 Lift Cylinder To Lift Arm Repair Group
| 6K***53 | Lift Cylinder To Lift Arm Repair Group | 1 |
5k2684 Master Cylinder Assembly
| 5K***84 | Master Cylinder Assembly | 1 |
5k2685 Master Cylinder Assembly
| 5K***85 | Master Cylinder Assembly | 1 |
4k6615 Swivel Joint Group
| 4K***15 | Swivel Joint Group | 1 |
4k6614 Swivel Joint Group
| 4K***14 | Swivel Joint Group | 1 |
4j5743 Tilt Cylinder Group--R.H.--6.50" X 32"
| 4J***43 | Tilt Cylinder Group--R.H.,Tilt Cylinder Group--L.H. | 1 |
Tilt Cylinder Lines--As Viewed From Front Left Hand Side Of Machine--Part 1 Of 2
Tilt Cylinder Lines--As Viewed From Front Left Hand Side Of Machine--Part 2 Of 2
988 serial number reference
On a 988, the PIN/serial plate sits on the machine frame near the cab: early machines have it mounted higher on the right (curb) side near the operator's platform, later reference guides point to the right side of the cab base or the front access-step area. Pre-2001 Cat machines show an 8-character serial like 87A1234: the first three characters are the prefix identifying the model/build series, the remaining digits are the unit's sequence number in that series. Match the letter-prefix against the model's known prefix block to confirm it belongs to the 988 rather than a related variant.
| Prefix | Identifies | Notes |
|---|---|---|
| 87A | 988 (original series, articulated wheel loader) | Sole factory prefix for the base 988, in production 1963 into the mid-to-late 1970s before the 988B replaced it. Fitted with the six-cylinder Cat D343 diesel, rated 300 flywheel hp (224 kW) at introduction, rising to 325 flywheel hp (242 kW) by 1968. Bucket capacity started around 3.8 m3 (5 cu yd), growing to about 4.6 m3 (6 cu yd) over the production run. No alternate or regional prefix confirmed for this generation. |
Frequently asked questions
What engine powers the original Caterpillar 988?
The original Caterpillar 988 (1963 into the mid-to-late 1970s, 87A serial prefix) runs a Caterpillar D343 six-cylinder naturally aspirated diesel, rated about 224 kW (300 hp) at introduction and rising to roughly 242 kW (325 hp) by 1968. It is a mechanically governed, pre-emissions engine with no electronic controls.
What is the operating weight of the Caterpillar 988?
Operating weight for the original 988 runs roughly 28,600-35,800 kg (63,000-79,000 lb), varying by bucket size, cab type, and counterweight configuration across the production run. Heavier ROPS-cab, larger-tire, bigger-bucket units sit toward the top of that range.
What replaced the Caterpillar 988?
The 988B succeeded the original 988 as Caterpillar's next-generation large wheel loader, arriving as the base 988 production run ended in the mid-to-late 1970s. The 988B moved to a different engine family, making it a distinct machine from the D343-powered original despite sharing the 988 nameplate.
What 988 owners discuss
What do owners and mechanics say about the D343 engine's overall reputation in this loader?
Field consensus on this generation of 988 is that the D343 is a fundamentally strong engine for its era, with an overhead-cam valvetrain that was unusual for a diesel of that vintage. Mechanics who've worked on them describe few chronic bugs when the engine is properly maintained. The tradeoff owners flag again and again: it is expensive to bring back once it's tired. A full rebuild done right can run into the tens of thousands of dollars (roughly 20,000-30,000 USD), so an engine that smokes, runs low on power, or burns oil should be priced into a deal rather than treated as a minor fix.
Is there a known quirk in how this engine likes to be run?
Yes. It's a pre-combustion-chamber (indirect-injection) diesel, and that design does not tolerate being lugged along at low speed to save fuel. Idling or working it at low RPM for long stretches lets raw fuel wet the pre-chamber and cylinder instead of burning cleanly, which shows up as smoke and carbon buildup rather than any real fuel savings. The practical advice from people who run these: keep it under real load at a normal working speed rather than throttling it back.
What should I know about cold starting and the starting circuit on this machine?
Like other pre-chamber Cat diesels of this vintage, it needs real heat to fire once temperatures drop - don't expect the starter alone to light it off in cool weather. A starting aid and strong batteries are normal equipment on these, not a sign of trouble. Some units wire an oil-pressure safety switch into the starting circuit; if the engine cranks but won't catch, or dies the instant it fires, check that switch and its wiring before assuming a bigger engine fault. If the machine has sat unused for a year or more, expect the injection pump to need attention too - plungers can stick from prolonged idleness, and a pump/governor service is often needed before it runs cleanly again.
How does the torque converter and powershift transmission behave, and what should I watch for?
This loader runs a torque-converter powershift transmission with single-lever shifting. Owners describe the whole machine as a slow giant - strong breakout force and payload for its size, but not quick to respond compared to a smaller loader, so it's a poor match for jobs needing fast, tight maneuvering in confined yards. On the converter itself, apparent slipping is sometimes just a mis-adjusted or disconnected control linkage to the converter valve rather than real converter wear, so check the linkage first. Typical overheating causes on a drivetrain this age are internal converter leakage, a scavenge pump that can't keep up, or a plugged oil cooler restricting flow - worth checking all three on any used unit given how old this equipment now is.
What wear should I expect on tires and how does the machine handle soft ground?
This is a heavy machine riding on four tires, and owners warn it needs reasonably solid, prepared ground underfoot - run it over soft or ungraded material and it punches through rather than floating across it. Tires are a real ownership cost: a single replacement commonly runs into the thousands of dollars, with service-call charges on top, so tread condition and remaining life should factor into any purchase decision, especially if the machine has worked abrasive or rocky material.
What about front-end pin and bushing wear on a machine this old?
On surviving units this age, articulation-joint pins, loader-arm pins, and bucket-linkage bushings are usually worn from decades of duty cycles. Full rebushing of the front end is a major job and a major cost, commonly running into the tens of thousands of dollars depending on how far things have gone. Some play at these joints is normal wear for original iron this old rather than an automatic red flag, but it needs to be priced into any deal rather than discovered as a surprise later. Check hydraulic lift and tilt pump condition at the same time - external leakage or sluggish cycle times point to a pump that's also due, and pump replacement is a significant expense on this design.
What should I check before buying a used original 988 (D343, pre-988B)?
Treat the hour meter as unreliable on a machine this old; ask for rebuild and service history on the engine, hydraulic pump, and drivetrain instead of trusting the gauge. Run the engine under load if possible - watch for smoke, listen for knock, and check oil pressure at idle and at rated speed, since a tired D343 is one of the most expensive things to put right on this machine. Ask when it last ran continuously; a long storage gap points to injection-pump service being needed even if it currently starts and idles. Walk the front end with the loader raised and unloaded and feel for play in articulation pins, loader-arm pins, and bucket linkage. Check the hydraulic pump and cylinders for external leakage. Price a full set of tires separately, since on a cheaply bought machine tires alone can rival the purchase price. Have your dealer or a qualified heavy-equipment tech verify service brake, parking brake, and steering function before putting the machine to work - on equipment this age, brake and steering system integrity should never be assumed from a test drive alone.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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