Caterpillarengine - machine(no series)

Caterpillar D348

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar D348 is not a complete machine - it is a heavy-duty diesel engine, a mechanical four-stroke V12 of 29.3 L (1,786 cu in) displacement with a 137 mm x 165 mm (5.4 in x 6.5 in) bore and stroke, twin-turbocharged and water-aftercooled through its own separate aftercooler circuit. Caterpillar built it in three factory arrangements: industrial (stationary pump and generator drive), marine (propulsion and marine generator sets), and vehicular. Output varies enormously by arrangement and rating: roughly 550 hp in the Cat 992/992B wheel loader, around 700 hp in the Cat D10 track-type tractor, 855-920 hp on marine propulsion duty, and about 465-565 kW (581-706 kVA) on generator-set duty at 1,500/1,800 rpm. Production dates to the pre-emissions 1970s, ahead of any electronic engine control - governing and fuel metering are fully mechanical.

The D348 sits in Caterpillar's vintage D3xx big-bore engine family alongside the D343 and D346, sharing cylinder-liner and rod-bearing design with those siblings, but no source documents a dedicated D348 successor model; Caterpillar did not carry the number forward the way it did with later engine families. What changed across the three arrangements was mainly cooling hardware and fuel calibration rather than the base engine - aftercooler water-line plumbing was revised more than once during the production run, and a keel-cooling option was added for marine installations that could not rely on raw seawater. The D348 still matters in the used and parts market because it powered genuinely long-lived equipment: the Cat D10 dozer, 992/992B loaders, older haul trucks, and marine propulsion or generator-set packages. Specialist support for its mechanical injection pump and governor is thinning with age, which is pushing some owners of D348-powered machines toward a repower with a later engine rather than another rebuild - an owner's cost decision, not a factory succession.

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 D348 specifications

Engine

Model / familyCaterpillar D348, a mechanical V12 four-stroke diesel from Caterpillar's vintage D3xx large-engine lineage (same generation as the D336/D343/D346 family). Documented serial-prefix ranges include 36J and 38J, covering different rating levels.
ConfigurationV12, twin-turbocharged, water-aftercooled (jacket-water aftercooling), direct injection.
Bore x stroke137 mm x 165 mm (5.4 in x 6.5 in).
Displacement29.3 L (1,786 cu in), consistent with the published bore and stroke. A higher 48.0 L figure appears on one low-quality aggregator site and does not reconcile with bore/stroke math or with the 1,786 cid figure used across dozer/loader references for this engine — treated as unreliable and not used here.
Power output (varies by application/rating)Output is application-specific rather than a single fixed figure: roughly 550 hp (410 kW) in the Cat 992/992B wheel loader, about 700 hp in the Cat D10 track-type tractor, and marine propulsion ratings seen at 855 hp @ 1,800 rpm (continuous) and up to about 920 hp @ 2,000 rpm (higher/intermittent rating) depending on arrangement. Generator-set drive applications run at 1,800 rpm (60 Hz) or 1,500 rpm (50 Hz) with continuous outputs commonly quoted in the roughly 465-565 kW (581-706 kVA) range depending on standby vs. prime duty and set configuration; smaller export packages as low as ~275 kVA at 1,500 rpm have also been seen. Verify the exact rating against the nameplate/arrangement number for the specific unit.
Emissions tierPre-emissions-regulation mechanical diesel; no EPA/EU nonroad tier applies (predates Tier/Stage emissions standards).

Weights

Bare engine weightNot documented in the sources reviewed for the complete assembled engine. A remanufactured engine block component alone is commonly listed in the roughly 800-820 kg (1,750-1,810 lb) range, but that reflects the block casting only, not the full assembled engine with heads, turbochargers, and accessories.
Packaged generator set weight (configuration-specific)One containerized, soundproofed D348 genset package (with alternator, skid, and enclosure) is listed at approximately 8,167 kg (18,006 lb). This is a complete packaged-set weight, not the bare engine weight, and will vary by enclosure/alternator selection.
Ground pressureNot applicable — this is a stationary/marine/genset-duty and heavy-equipment power unit, not a tracked or wheeled chassis in its own right.

Dimensions

Bare engine transport dimensionsNot documented in the sources reviewed for the standalone engine.
Packaged generator set footprint (configuration-specific)The same containerized 50 Hz genset package referenced above measures approximately 3,708 mm long x 1,778 mm wide x 2,083 mm high (146 in x 70 in x 82 in). This is package/enclosure-specific and not a bare-engine figure.
Other class-relevant dimensionsBore/stroke and cylinder-bank geometry are covered under Engine; no additional factory engine envelope dimensions (length/width/height) were found across the sources checked.

Performance

Rated speed rangeDuty-cycle dependent: 1,500-1,800 rpm for generator-set prime/standby duty, 1,800 rpm for continuous marine propulsion, and up to roughly 2,000 rpm on the higher marine propulsion rating.
InductionTwin-turbocharged with water aftercooling across the ratings reviewed.
Fuel consumption / torque figuresFigures circulating online for brake specific fuel consumption and peak torque trace back to a single low-quality aggregator that also produced an inconsistent displacement figure; these were not corroborated elsewhere and are not reported here. Confirm against the nameplate arrangement's factory performance curve.
Travel speed / gradeabilityNot applicable to the engine itself — travel speed and gradeability are properties of the host machine (e.g., D10 dozer, 992 loader, 777 truck), not the power unit, and were not in scope of the sources reviewed for this engine listing.

Service capacities (summary)

Engine oil (sump)Not confirmed with a specific liter/quart figure across the sources reviewed. Lubricant-application guidance references a distinct "standard sump" D348 configuration (separate from deep-sump variants seen on other Cat marine engines of the era), implying more than one sump/capacity configuration exists — verify against the arrangement-specific lubrication chart.
Cooling systemOne secondary lubricant/coolant reference cites roughly 197 L (52 US gal) for the jacket-water system; this was not independently corroborated against a primary Cat spec sheet and should be treated as approximate pending dealer confirmation.
Fuel tankNot a fixed factory engine spec — fuel supply/day-tank sizing is set by the vessel, genset skid, or host-machine installation rather than the engine itself.
Hydraulic systemNot applicable — this is a diesel power unit, not a machine with its own hydraulic implement circuit.

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

D348 fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (with oil filters)Not published in accessible OMM excerpts for the D348 engine-machine (98S-prefix) build — sump size varies with the oil pan/oil cooler arrangement fitted by the equipment builder. Service interval per the chart is every 125 service hours or 2 weeks, with daily level checks against the ADD/FULL marks on the oil-level gauge.Caterpillar Series 3 additive-type diesel engine oil (the heavy-duty multigrade spec that predates the modern Cat DEO line). The available chart references only the oil class by name; it does not break out SAE viscosity grades by ambient temperature for this engine — follow the standard Cat viscosity-vs-ambient-temperature guidance when selecting grade.
Engine jacket cooling systemNot documented for this exact engine-machine configuration in available sources; varies by radiator or heat-exchanger setup. Coolant is topped to within about 1 cm (3/8 in) of the filler-neck base, checked daily. Installations with dual radiators require checking both.Cat-specified coolant/antifreeze with corrosion inhibitor for this engine generation; the accessible chart does not name a specific coolant brand for this build.
Aftercooler cooling circuitSeparate circuit from the jacket-water system on this twin-turbocharged, water-aftercooled engine; capacity not documented in available sources. Checked on the same daily (10-hour) interval as the jacket-water system.Same coolant specification as the jacket-water system per the OMM's shared cooling-system service note.
Fuel tankNot specified by Cat for this build — the D348 engine-machine ships as a bare engine package; fuel tank sizing is set by the OEM chassis or equipment builder, not the engine OMM.Diesel fuel with a cloud point at least 10°F (about 6°C) below ambient temperature in cold climates, to prevent paraffin crystals from plugging the fuel filter.
Grease points (radiator fan bearing)Quantity not specified — lubricate the fitting until purge, per standard practice. Interval per the chart is every 500 service hours or 3 months.Multipurpose grease (MPG), per the OMM's lubrication and maintenance chart.

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Caterpillar D348 maintenance schedule

Service intervalTasks
Every 50 h
  • Check engine oil level against the ADD/FULL marks before starting each shift.
  • Check jacket-water coolant level at the filler neck; on dual-radiator installations check both radiators.
  • Check the separate aftercooler coolant circuit level, independent from jacket water on this twin-turbo engine.
  • Drain water and sediment from the fuel-water separator.
  • Walk around weekly for coolant, oil, or fuel leaks and listen for unusual turbocharger or governor noise.
Every 250 h
  • Change engine oil and filters; the factory chart calls for this roughly every 125 hours, so perform it at least once, often twice, within this service.
  • Inspect the fuel filter element and replace if restriction is evident.
  • Check drive-belt tension and condition on the fan and accessory drives.
  • Check battery electrolyte level and terminal condition on genset and vehicular installations.
  • Inspect turbocharger mounting hardware and boost/exhaust piping for leaks or looseness.
Every 500 h
  • Grease the radiator fan bearing per the factory lubrication chart.
  • Pull an engine oil sample for analysis to track liner and bearing wear trends.
  • Check governor linkage for free movement and wear at the pivots.
  • Inspect the aftercooler core and jacket-water radiator or heat exchanger externally for fouling and clean as needed.
  • On marine and industrial builds, inspect the raw-water pump and strainer for fouling.
Every 1,000 h
  • Pull injector nozzles for spray-pattern and opening-pressure testing.
  • Check and adjust valve lash and rocker-arm clearance.
  • Check injection-pump timing against the factory setting.
  • Renew cooling-system corrosion inhibitor and inspect hoses for age-related cracking.
  • Check turbocharger shaft end play and bearing condition.
Every 2,000 h
  • Send the injection pump to a qualified shop for full calibration on a test stand.
  • Overhaul or exchange turbochargers if boost or shaft-play readings have drifted out of spec.
  • Run a compression and blow-by check across all twelve cylinders to gauge bottom-end condition.
  • Replace drive belts and coolant hoses as a set rather than piecemeal.
  • Reassess the governor's mechanical condition and recalibrate if hunting has been noted in service.
Every 4,000 h
  • Plan a full top-end teardown to inspect cylinder liners and connecting-rod bearings for wear consistent with hours run.
  • Rebuild or replace the mechanical governor and injection pump as a matched, recalibrated set rather than servicing components separately.
  • Inspect crankshaft and main bearings if liner/rod wear or oil-analysis trends indicate bottom-end distress.
  • Verify the engine's arrangement and serial prefix before ordering overhaul parts, since industrial, marine, and vehicular builds don't share every component.

Servicing the D348 beyond the schedule

Predictive maintenance & fluid analysis

Track oil condition through scheduled sampling to catch cylinder-liner and rod-bearing wear metals before they show up as pressure loss. Monitor jacket-water and aftercooler coolant separately, since this V12 runs two distinct cooling circuits with different fouling patterns. Trend fuel-filter differential pressure to flag injection-system contamination early, and watch turbocharger boost and exhaust temperature for drift. A mechanical governor gives no fault code, so listen for hunting or slow load response as the earliest predictive signal of linkage wear.

Corrective & common repairs

The most common D348 complaint is a governor that hunts or answers load sluggishly, usually linkage wear or gummed varnish in a mechanical injection pump that sat idle between duty cycles. Turbocharger bearing wear shows up as boost loss and smoke. Marine builds foul their raw-water pump and heat exchanger and need periodic cleaning. Aftercooler water-line plumbing was revised more than once across the production run, so cooling fittings from one serial range should not be assumed to bolt onto another.

Overhaul & rebuild points

Overhaul inspections on this V12 consistently turn up cylinder-liner and connecting-rod-bearing wear, the same pattern seen on its D343 and D346 siblings. Run a compression and blow-by check before committing to a teardown. The mechanical injection pump and governor need specialist test-stand calibration, a shrinking skill base industry-wide, so line up that support before scheduling a rebuild. Confirm the engine's industrial, marine, or vehicular serial prefix first, since overhaul parts and cooling hardware differ by arrangement.

Seasonal & environment servicing

In cold climates, run a fuel grade with a cloud point well below ambient temperature to keep the mechanical injection system from plugging on paraffin. Marine units cooled by raw water or converted to keel cooling need lay-up and freeze protection specific to that circuit, separate from the jacket-water side. Standby generator sets sitting idle between calls should be exercised periodically so fuel does not varnish the governor and injection pump. Dual-radiator installations need both circuits checked in hot ambient duty.

D348 common service parts

Part numberPart
1D-4540Bolt,Machine Fuel Filter MountingCheck fitment →
4J-6064Filter Element As-OilCheck fitment →
6N-8224Filter As-OilCheck fitment →
7N-8417Filter As-OilCheck fitment →
6N-1570Filter As-OilCheck fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

D348 fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
OVERSPEED TRIP (governor mechanical shutdown)Governor-driven mechanical overspeed trip has released, closing the fuel rack/shutoff lever because engine speed exceeded the preset trip point.Sudden loss of load, governor linkage failure or wear, or a stuck fuel rack allowing rpm to climb unchecked.Confirm the engine has stopped, do not restart until the governor and linkage are inspected and the overspeed trip is reset per the service manual.
MECHANICAL SHUTOFF LEVER / FUEL RACK TRIPPEDThe mechanical shut-off group has moved the fuel rack to the stop position, cutting fuel delivery at the injection pump.Manual emergency stop pull, or an automatic trip (overspeed, oil, or temperature switch) linked into the same shutoff lever.Check the shutoff lever position and any linked safety switches before resetting the lever and attempting a restart.
LOW OIL PRESSURE SHUTDOWN / ALARMPanel-mounted oil pressure switch has signaled that lubricating oil pressure dropped below the safe threshold, tripping an alarm or, on shutdown-equipped sets, cutting fuel.Low oil level, worn oil pump, plugged suction strainer or filter, or increased bearing clearance from wear.Shut the engine down immediately, check oil level and filter/strainer condition, and verify switch calibration before restart.
HIGH JACKET WATER TEMPERATURE SHUTDOWN / ALARMPanel water-temperature switch indicates coolant temperature exceeded the safe limit, tripping an alarm or shutdown.Raw-water pump or seawater strainer blockage (marine), clogged heat exchanger or radiator, low coolant, or a stuck thermostat.Shut down, inspect raw-water strainer/pump and heat exchanger, verify coolant level, then restart.
LOW COOLANT LEVEL ALARMFloat-type low-coolant switch on the control panel signals coolant level has dropped below the safe minimum.Coolant leak, blown hose, or head/liner seal seepage.Shut down, find and repair the leak, then refill and bleed the cooling system before restart.
FAIL-TO-START / OVERCRANK ALARMControl-panel cranking-cycle timer indicates the starter completed its allotted crank attempts without the engine firing.Air in the fuel system, plugged fuel filter, weak starting batteries, or (on air-start units) insufficient starting-air pressure.Check the fuel system for air or blockage and confirm battery or starting-air supply before attempting another start cycle.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

D348 attachments & work tools

Engine identity, not a work-tool host

The D348 is a Caterpillar V12 diesel engine (29.3 L / 1786 cu in, 137 mm bore x 165 mm stroke), turbocharged and aftercooled, built as a power unit rather than a machine with hydraulic attachment points. It has no boom, coupler, or work-tool circuit of its own; compatibility questions for this model concern installation arrangement and driven equipment, not attachments.

Marine propulsion arrangement

Sold as a marine propulsion engine with a flywheel housing sized to couple to a separate reduction/reverse marine gear (mechanical clutch-and-gear unit) for single- or twin-screw installations. Propulsion power ratings vary with duty cycle and reduction-gear ratio selected for the vessel; treat any single continuous-duty figure as arrangement-specific and confirm against the nameplate.

Marine generator-set arrangement

Also built as the prime mover in marine diesel generator sets, coupled through its flywheel/adapter housing to an AC generator end rather than a propeller shaft. Commonly documented outputs cluster around 500-565 kW (approx. 625 kVA) at 1800 rpm, 60 Hz; exact kW/voltage combination depends on the generator end and site frequency ordered.

Industrial (stationary) arrangement

A separate industrial arrangement of the D348 exists for stationary duty such as driving pumps or industrial generator ends on land-based sites. This arrangement still carries a raw-water pump group in its cooling circuit, indicating the industrial build shares core cooling hardware with the marine build rather than using a fully separate design.

Vehicular (off-highway) arrangement

A distinct vehicular engine arrangement of the D348 is documented under its own serial-number prefix, separate from the marine and industrial builds. Sources do not confirm a specific host machine model for this arrangement, so pair it only with the exact serial-prefix documentation, not by assuming a particular tractor or truck chassis.

Cooling system options

Standard marine cooling uses a raw-water heat-exchanger circuit (seawater or raw water on one side, jacket water on the other). A factory option converts the aftercooler side to a keel-cooling type aftercooler and connections group for closed-loop, through-hull-free installations where raw water is undesirable or unavailable.

Fan drive and radiator cooling arrangement

For radiator-cooled (non-marine-heat-exchanger) installations, the engine offers a fan-drive arrangement group with adjustable fan-to-crankshaft center distance, letting installers match fan placement to the driven equipment's cooling package. This is an engine-mounting/cooling configuration choice, not a work-tool option.

Coupling and mounting, not quick-couplers

Because the D348 is an engine, its 'coupler' equivalent is the SAE-pattern flywheel housing used to mate the crankshaft/flywheel to a marine gear, generator end, or driven pump rather than any hydraulic quick-coupler or work-tool mount. Exact SAE housing size is not confirmed across sources for this model; verify against the specific arrangement's parts documentation.

All D348 assemblies by section

Every catalogued assembly group for the Caterpillar D348. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Basic Engine
4n5034 Belt Tightener Group
4n7459 Camshaft Group
4n8066 Valve Mechanism Cover Group
Crankshaft Bearing Replacements
4n6818 Crankshaft Group
6n7329 Cylinder Block Assembly
4n8101 Cylinder Block Group
2s711 Cylinder Head Group
7n9551 Cylinder Head Group
4n4416 Pulley And Damper Group
7n8533 Fan Drive Group--Temperature Controlled--Part 2 Of 3
2L***76Terminal; (14-Ga To 16-Ga, No. 10 Screw)(Alternator Harness To Alt. Neg)9
2M***95Gasket-Tube As To Regulator Housing1
2S***11Body-- Fuse Holder1
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7n8533 Fan Drive Group--Temperature Controlled--Part 1 Of 3
0L***51Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold2
0S***91Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***828
1A***37Bolt Clutch Assembly To Bracket (Fan Support)4
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7n8533 Fan Drive Group--Temperature Controlled--Part 3 Of 3
4F***79Bolt Clip To Tube Assembly (Aftercooler Radiator Inlet)1
5M***94Washer; Bracket To Tee, Bracket To Block, Tube As. To Tee, Tube As. To Oil Cooler1
7N***48Switch Temperature (Aftercooler Water Warning)1
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6n1904 Fan Drive Group
9s4633 Hydraulic Pump And Air Compressor Drive Group
4n7052 Flywheel Group
4n6137 Oil Level Gauge Group
4N***37Gauge Group-Oil Level (Dipstick)1
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4n4902 Front Gear Group
4n4903 Rear Gear Group--Part 2 Of 2
4n4903 Rear Gear Group--Part 1 Of 2
4n7461 Camshaft Housing Group
4n7080 Flywheel Housing Group--End View--Part 1 Of 2
4n7080 Flywheel Housing Group--Side View--Part 2 Of 2
4n7436 Front Housing Group
4n6135 Oil Pan Group
4n8952 Connecting Rod And Piston Group--6 Required
4N***52Piston & Rod Group; Connecting Rod And Piston Group1
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4n8952 Connecting Rod And Piston Group--8 Required
4N***52Piston & Rod Group; Connecting Rod And Piston Group1
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4n7077 Crankshaft Seal Group
9d2870 Engine Support Group
4n7081 Engine Trunnion Group
4n7460 Valve Mechanism Group
Cab, Gauges And Accessories
2g385 Air Conditioner Arrangement--Heating And Cooling
2G***85Air Conditioner Ar1
4N***62Compressor Group-Refrigerant1
8D***11Air Conditioner Group1
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9p187 Air Conditioner Group--Type 2
9P***87Air Conditioner Group; Air Conditioner Group1
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9p187 Air Conditioner Group--Type 3
9P***87Air Conditioner Group; Air Conditioner Group1
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8d9811 Air Conditioner Group--Replaced By 9p187 Shown On Page 272a--
8d9811 Air Conditioner Group--Type 2
9p187 Air Conditioner Group--Type 1
9P***87Air Conditioner Group; Air Conditioner Group1
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3v7114 Basic Belt Group
6g699 Cab Blower Group--Type 1
6g699 Cab Blower Group--Type 2
2g7820 Cab Group--Part 1 Of 2
2g7820 Cab Group--Part 2 Of 2
6g750 Cab Group
2g3850 Cab Group
2g3710 Cab Group--Part 2 Of 2
2g3710 Cab Group--Part 1 Of 2
2g7840 Cab Group--Part 2 Of 2
2g7840 Cab Group--Part 1 Of 2
8d6600 Cab Visor Group
7n4297 Clutch And Refrigerant Compressor Group
7N***97Clutch & Refrig Compressor Group1
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1p2780 Refrigerant Compressor Group
4n4462 Refrigerant Compressor Group--Type 2
4n4462 Refrigerant Compressor Group--Type 1
4n4462 Refrigerant Compressor Group--Type 3
9d5315 Condenser And Mounting Group--Type 2
9d5315 Condenser And Mounting Group--Type 1
8d7580 Door Group--L.H.--Part 2 Of 2
8d7580 Door Group--L.H.--Part 1 Of 2
8d7570 Door Group--R.H.--Part 1 Of 2
8d7570 Door Group--R.H.--Part 2 Of 2
4n8027 Tachometer Drive Group
9d5325 Tachometer Drive Group--Chassis Area
9d4795 Tachometer Drive Group--Cab Area
2g8340 Window Guard Group--With Rops
9p220 Harness Assembly
9p219 Harness Assembly
6g2471 Heater Arrangement--Low Ambient Temperature Operations
6G***30Heater Group-Cab; Cab Heater Group1
6G***60Lines Group-Heater1
6G***71Heater Ar1
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6g780 Heater Arrangement--Field Installation
00***89Valve As-Drain2
0T***02Bolt; (3/8-16x0.625-In)(Shield To Head)1
1B***30Nut-- Flame Arrestor Or Adapter To Pipe Assembly7
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9p188 Heater Group--Type 2
9p188 Heater Group--Type 3
9p188 Heater Group--Type 1
9d4660 Cab Heater Group
6g830 Cab Heater Group--Field Installation--Type 2
6G***30Heater Group-Cab; Cab Heater Group1
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6g830 Cab Heater Group--Field Installation--Type 1
6G***30Heater Group-Cab; Cab Heater Group1
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9d4800 Air Horn Group--Cab Area
9d5460 Air Horn Group--Chassis Area
5d6998 Air Horn Assembly
9d4780 Air Conditioner Lines Group
6g1760 Heater Lines Group
9d5390 Heater Lines Group
5t5495 Wiper Linkage Group
2g1580 Rear View Mirror Group--Cab Area
9d4670 Rear View Mirror Group--Chassis Area
9d3730 Wiper Motor Group
5t5577 Wiper Motor Group
7v9507 Seat Belt Group
6g850 Seat Group
9d7960 Seat Group
9d6210 Adjustable Seat Group
9d3960 Recording Tachograph Group--24 Volt
6n8161 Tachometer Drive Group
9d4975 Safety Tread Group
3d9943 Horn Valve Group
6g5265 Cab Visor Group
9d8902 Washer Group
8d6950 Windshield Washer Group
6g1660 Weather Insulation Group--Field Installation
9d8465 Window Guard Group--Type 1
9d8465 Window Guard Group--Type 2
8d6960 Windshield Wiper Group
6g783 Wire Assembly
Chassis
9d8505 Windrow Breaker Group
9d4240 Catwalk Group
9d4865 Cowling Group
2g3120 Door Control Group--Tractor Parts
2g140 Fender Group--Rear
9d4870 Fender Group--Front
2g2389 Frame Assembly--Part 1 Of 2
6g1592 Frame Assembly--Part 2 Of 2
2g2389 Frame Assembly--Part 2 Of 2
6g1592 Frame Assembly--Part 1 Of 2
2g2470 Frame Group
9d4150 Drive Shaft Guard Group
2g110 Hitch Group
6g1585 Hood Group--Part 3 Of 3
9d5040 Hood Group--Part 1 Of 2
6g1585 Hood Group--Part 2 Of 3
9d5040 Hood Group--Part 2 Of 2
6g1585 Hood Group--Part 1 Of 3
9d4685 Ladder Group
9d2900 Hydraulic Tank Mounting Group
2g145 Platform Group--Rear
9d4680 Platform Group
9d4680 Platform Group--Side
2g1280 Turn Stop Group
3g683 Front Suspension Group
4t3235 Front Suspension Group
4T***35Suspension Group-Front1
4T***56Suspension Group-Front; (Cylinder)1
5P***79Tag-Notice; (Cylinder Pressure)1
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9d2680 Front Suspension Group
9D***80Suspension Group-Front; -Non-Eu Front Struts1
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4t4756 Front Suspension Group
4T***56Suspension Group-Front; (Cylinder)1
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9d2730 Rear Suspension Group
9D***30Suspension Group-Rear; -Cylinder1
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9j7776 Rear Suspension Group
Cooling System
4n7718 Water Aftercooler Group
4n4836 Brake And Torque Converter Cooler Group--Side View--Part 3 Of 3
4N***36Cooler Group-Brake & Torque Conv1
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4n4836 Brake And Torque Converter Cooler Group--Side View--Part 2 Of 3
4N***36Cooler Group-Brake & Torque Conv1
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4n4836 Brake And Torque Converter Cooler Group--End View--Part 1 Of 3
4N***36Cooler Group-Brake & Torque Conv1
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4w7063 Brake And Torque Converter Cooler Group--Part 2 Of 3
4W***63Cooler Group-Brake & Torque Conv1
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4w7063 Brake And Torque Converter Cooler Group--Part 1 Of 3
4W***63Cooler Group-Brake & Torque Conv1
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4w7063 Brake And Torque Converter Cooler Group--Part 3 Of 3
4W***63Cooler Group-Brake & Torque Conv1
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4n4726 Engine Oil Cooler Group
4w0413 Oil Cooler Core Group
4W***13Core Group-Oil Cooler; -Rear Brake, Hoist-Front Brake, Tc1
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4w294 Oil Cooler Core Group
4W***94Core Group-Oil Cooler; Oil Cooler Group Between 41 And1
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1w5942 Oil Cooler Core Group
4n4533 Suction Fan And Guard Group
6n4758 Jacket Water Heater Group
5t8979 Oil Cooler Lines Group
5t8786 Power Train Cooler Lines Group
4n4598 Jacket Water Lines Group--Part 2 Of 2
4n4661 Aftercooler Water Lines Group
4n4598 Jacket Water Lines Group--Part 1 Of 2
1n8576 Aftercooler Water Pump Group
6n6366 Water Pump Group
6N***66Pump Group-Water; Water Pump Group1
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4n5244 Radiator Group--Engine--Side View Part 2 Of 2
4n4106 Radiator Group--Aftercooler--Part 1 Of 2
4n4106 Radiator Group--Aftercooler--Part 2 Of 2
4n5244 Radiator Group--Engine--Side View-Part 2 Of 2
4n5244 Radiator Group--Engine--Rear View Part 1 Of 2
4n5244 Radiator Group--Engine--Rear View-Part 1 Of 2
7t297 Valve Group--Cooler By-Pass
7T***97Valve Group-Cooler Bypass; -Transmission Oil Cooler Inlet1
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Engine Arrangement
4n8330 Basic Engine Arrangement--Part 2 Of 2
1N***76Pump Group-Water1
2N***84Manifold Group-Exhaust1
2S***62Plug & Wiring Group-Glow; Glow Plug And Wiring Group1
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4n8330 Basic Engine Arrangement--Part 1 Of 2
2S***11Cylinder Head Group1
2W***77Filter Group-Oil1
4N***16Damper & Pulley Group1
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Fuel System And Governor
9d9880 Fast Fill Fuel Adapter Group--Automatic Shut-Off--Type 2
9d9890 Fast Fill Fuel Adapter Group--Manual Shut-Off
9d9880 Fast Fill Fuel Adapter Group--Automatic Shut-Off--Type 1
4n8294 Fuel Ratio Control Group
2p9625 Fuel Ratio Control Group
2P***25Control Group-Fuel Ratio; Fuel Ratio Control Group1
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9d5310 Governor Control Group--Chassis Area
2g8970 Governor Control Group--Cab Area
9d630 Dust Cover Group
4n6680 Variable Timing Drive Assembly
8h7204 Fuel Filter Group
8s2812 Fuel Filter Group
8S***12Filter Group-Fuel; Fuel Filter Group1
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6n945 Primary Fuel Filter Group
9d9458 Fuel Gauge Group
4n8295 Governor And Fuel Injection Pump Group
9d5305 Governor Control Group--Cab Area
4n4017 Governor Group--Part 1 Of 3
7n2852 Governor Group--Part 2 Of 3--Type 1
7n2852 Governor Group--Part 3 Of 3--Type 4
7n2852 Governor Group--Part 3 Of 3--Type 1
7n2852 Governor Group--Part 2 Of 3--Type 4
4n4017 Governor Group--Part 3 Of 3
7n2852 Governor Group--Part 3 Of 3--Type 3
7n2852 Governor Group--Part 2 Of 3--Type 2
4n4017 Governor Group--Part 2 Of 3
7n2852 Governor Group--Part 3 Of 3--Type 2
7n2852 Governor Group--Part 1 Of 3--Type 4
7n2852 Governor Group--Part 1 Of 3--Type 2
7n2852 Governor Group--Part 1 Of 3--Type 1
7n2852 Governor Group--Part 2 Of 3--Type 3
7n2852 Governor Group--Part 1 Of 3--Type 3
8n9775 Fuel Heater Group--Type 1
8n9775 Fuel Heater Group--Type 2
9d4740 Fuel Lines Group
4n7704 Fuel Injection Lines Group--Part 1 Of 2
4n7704 Fuel Injection Lines Group--Part 2 Of 2
5d1920 Protection Cover Group--Fuel Tank Cap
5D***20Protection Cover Group-Fuel Tank Cap; Protection Cover Group1
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4n6712 Fuel Injection Pump Group--Part 2 Of 2--Type 1
4n6712 Fuel Injection Pump Group--Part 1 Of 2--Type 1
4n6712 Fuel Injection Pump Group--Part 2 Of 2--Type 2
4n6712 Fuel Injection Pump Group--Part 1 Of 2--Type 2
8s2001 Fuel Priming Pump Group
8S***01Pump Group-Fuel Priming; Fuel Priming Pump Group1
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8s2793 Fuel Transfer Pump Group (8s2792 N/S)
9s5310 Governor Control Group--Chassis Area
4n7776 Service Meter Group
4n4358 Governor Torque Spring Group
4N***58Spring Group-Governor Torque; Governor Torque Spring Group1
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9d3785 Fuel Tank Group
2g9000 Fast Fill Adapter Group
Hydraulic System
9g9288 Steering Tank Cap Protection Cover Group
9G***88Protection Cover Group; -Hydraulic Tank-Steering Tank Fill Cap-Hydraulic Tank Fill Cap1
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2g1810 Accumulator And Mounting Group
9j2019 Accumulator Group
3g3964 Accumulator Group
5t6942 Protection Covers Group--Transmission Tank Cap
5T***42Cap Group-Protection; -Transmission Tank Fill Cap1
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9d4600 Door Cylinder Control Group--Chassis Area
9d4110 Door Cylinder Control Group--Cab Area
8j5381 Control Valve Group
5t8748 Split Oil--Field Conversion Arrangement--Hydraulic
4W***63Cooler Group-Brake & Torque Conv1
5T***48Conversion Ar-Split Oil(Field)1
5T***80Drive Group-Pump1
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5d1900 Protection Cover Group--Hydraulic Tank Cap
5D***00Cover Group-Protection; Protection Cover Group-- Hydraulic Tank Cap1
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5d1910 Protection Cover Group--Steering Tank Cap
5D***10Cover Group-Protection; Protection Cover Group Hydraulic Tank Cap1
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6g8380 Protection Cover Group--Steering Tank Cap
6g8390 Hydraulic Tank Cap Protection Cover Group
6G***90Covers Group-Protection; -Brake, Hoist, Torque Converter1
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9d2910 Steering Cylinder And Mounting Group
8j9912 Steering Cylinder Group (Change 0-2)--4" Bore X 17.40" Stroke
9d2735 Pump Drive Group--Transmission, Steering And Door Cylinder
5t8780 Pump Drive Group
2g1980 Grease Lines Group
5t8789 Rear Attachment Lines Group
9d8495 Rear Attachment Lines Group
5t8824 Pump Group
3t8098 Gear Pump Group
3T***98Pump Group-Gear; -Torque Converter Charging, Scavenge, Parking Brake Release1
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9d2287 Gear Pump Group--Door Cylinder--Single Section
4t2590 Gear Pump Group
3t8089 Gear Pump Group
3T***89Pump Group-Gear; (Transmission)1
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3t3712 Gear Pump Group
3T***12Pump Group-Gear; -Brake Cooling1
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9j7152 Steering Tank And Filter Group (2g700 N/S)--Part 1 Of 2
9j7152 Steering Tank And Filter Group (2g700 N/S)--Part 2 Of 2--Type 2
9j7152 Steering Tank & Filter Group (2g700 N/S)--Part 2 Of 2--Type 1
9j7152 Steering Tank And Filter Group (2g700 N/S)--Part 2 Of 2
9j7152 Steering Tank And Filter Group (2g700 N/S)--Part 1 Of 2--Type 1
9j7152 Steering Tank And Filter Group (2g700 N/S)--Part 1 Of 2--Type 2
8j4600 Hydraulic Tank And Valve Group--Part 3 Of 4
8j4600 Hydraulic Tank And Valve Group--Part 4 Of 4
8j4600 Hydraulic Tank And Valve Group--Part 1 Of 4
8j4600 Hydraulic Tank And Valve Group--Part 2 Of 4
5t8823 Field Conversion Tank Group--Part 2 Of 2
4J***23Packing,Preformed Cover And Valve Body3
4J***15Gasket; (Fill Cap)1
5T***23Tank Group1
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5t8823 Tank Group
5t8823 Field Conversion Tank Group--Part 1 Of 2
03***17Screw-Button Head; (3/8-16x1-In)8
0L***51Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold26
0S***71Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting4
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8j8321 Control Valve Group
8j2380 Relief Valve Group
8J***80Valve Group-Relief; -Rear Brake1
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9j622 Relief Valve Group--Pilot Operated
Intake And Exhaust System
9d4030 Air Cleaner Group
1p5011 Air Compressor Group
4n4433 Air Compressor Group
2g6125 Air Dryer Group--Brake
2w4226 Turbocharger Oil Supply Conversion Group--Field Installation
2W***26Conversion Group-Turbo Oil Supply1
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4n4727 Fumes Disposal Group
9d4010 Air Lines Group--Intake
4n8273 Air Lines Group
4n4612 Turbocharger Oil Lines Group
2n6984 Exhaust Manifold Group
2g2350 Exhaust Piping Group
6g4460 Precleaner Group
6n7256 Turbocharger Group--R.H.
6N***57Turbo Charger Group,Turbo Charger Group1
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4n7070 Turbocharger Group
8n9134 Turbocharger Group--R.H.
8n9133 Turbocharger Group--L.H.
9l5918 Basic Turbocharger Group--Field Installation
Lubrication System
8s6180 Breather Group
8S***80Breather Group; Breather And Fumes Disposal Group1
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2w4832 Engine Oil Filter Conversion Group--Field Installation
2W***32Conversion Group-Engine Oil Filter1
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5n6435 Protection Cover Group--Oil Filler Cap
5N***35Cover Group-Oil Filler Cap Protn1
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2s3025 Protection Cover Group--Oil Filler Cap
2S***25Cover Group-Protection; Protection Cover Group1
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6n1173 Oil Drain Extension Group
4n6138 Oil Filler Group
6n8224 Oil Filter Assembly
7n8417 Oil Filter Assembly
6n1570 Oil Filter Group--Side Mounted
7s7052 Oil Filter Group--Top View
2w577 Oil Filter Group
4n6136 Oil Lines Group
9d5395 High Speed Oil Change Group
9s9671 Oil Pump Group
4n8117 Oil Pump Group
8n1928 Oil Pump Group
8n1926 Oil Pump Group
Power Train-Power Transmission Unit
2g8110 Accumulator And Mounting Group
8p9504 Accumulator Group
6p7816 Accumulator Group
2p9274 Transmission Case And Covers Group--Side View Part 1 Of 2
2p9274 Transmission Case And Covers Group--End View Part 2 Of 2
9d8615 Transmission Control Group
2p9260 Transmission Hydraulic Control Group--Part 1 Of 3
2P***60Control Group-Transmission Hydraulic1
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2p9260 Transmission Hydraulic Control Group--Part 3 Of 3
2P***60Control Group-Transmission Hydraulic1
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2p9260 Transmission Hydraulic Control Group--Part 2 Of 3
2P***60Control Group-Transmission Hydraulic1
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2p9217 Shift Cylinder Group
9d2315 Differential And Bevel Gear Group
9D***15Differential & Bevel Gear Group1
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8d5620 Differential Group
6g7565 Differential Group
9d1920 No-Spin Differential Group
9d3525 Drive Shaft Group--Hydraulic Pump
2g4080 Drive Shaft Group
9j8751 External Filter Group
3g7231 External Filter Group
7j5618 Transmission Filter Group
6p4603 Transmission Filter Group--With Housing
6P***03Filter Group-Oil; -Park Brake Release, Xmsn-Parking Brake Release-Rear Brakes1
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9d2710 Final Drive Group
2p6961 Gear Pump Group--Transmission Charging
8p6843 Gear Pump Group--Transmission Scavenge
2p9275 Governor And Drive Group
8s6340 Governor Group
5t8783 Drive Shaft Guard Group
9d2720 Rear Axle Housing Group
5t8787 Power Train Oil Lines Group--Part 4 Of 5
9d5340 Power Train Oil Lines Group--Part 3 Of 4
9d5340 Power Train Oil Lines Group--Part 2 Of 4
5t8787 Power Train Oil Lines Group--Part 1 Of 5
9d5340 Power Train Oil Lines Group--Part 4 Of 4
9d5340 Power Train Oil Lines Group--Part 1 Of 4
5t8787 Power Train Oil Lines Group--Part 5 Of 5
5t8787 Power Train Oil Lines Group--Part 2 Of 5
5t8787 Power Train Oil Lines Group--Part 3 Of 5
7t6032 Valve Group--Part 2 Of 2
03***88Connector-Tube Assembly To Main Relief1
2S***82Seal (High Temperature)1
3L***68"O" Ring1
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7t6032 Valve Group--Part 1 Of 2
0S***18Bolt; (5/16-18x1-In)(Hydraulic Pump)6
1D***40Bolt,Machine Fuel Filter Mounting4
1F***18Pin1
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6p3328 Pressure Control Valve Group--Part 1 Of 2--Replaced By 7g2612 On Pages 167c & 167d
6p3328 Pressure Control Valve Group--Part 2 Of 2
6p3328 Pressure Control Valve Group--Part 1 Of 2
9d2288 Gear Pump Group--Transmission Charging--Double Section
8p6851 Gear Pump Group--Transmission Scavenge--Triple Section
9d5805 Demountable Rim Group--27.00 X 49 Tubeless Tires
9d5805 Demountable Rim Group--27.00 X 49
9m8669 Magnetic Screen Group
9M***69Screen Group-Magnetic; -Differential Lock1
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6t3361 Magnetic Screen Group
6T***61Screen Group-Magnetic; -Transmission Oil Lines1
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7s6937 Selector Valve Group--Replaced By 8p4221 On Page 168a
9p6582 Shift Pressure Valve Group
2g3130 Slip Joint Group
6p1814 Torque Converter Group
1t1099 Torque Converter Group--Part 2 Of 2
1t1099 Torque Converter Group--Part 1 Of 2
2p9273 Transfer Gear Group--Input
2p9266 Transmission Arrangement
2p9272 Planetary Transmission Group--Part 4 Of 6
2P***72Transmission Rear Axle Planetary1
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2p9272 Planetary Transmission Group--Part 5 Of 6
2P***72Transmission Rear Axle Planetary1
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2p9272 Planetary Transmission Group--Part 6 Of 6
2P***72Transmission Rear Axle Planetary1
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2p9272 Planetary Transmission Group--Part 3 Of 6
2P***72Transmission Rear Axle Planetary1
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2p9272 Planetary Transmission Group--Part 1 Of 6
2P***72Transmission Rear Axle Planetary1
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2p9272 Planetary Transmission Group--Part 2 Of 6
2P***72Transmission Rear Axle Planetary1
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9d2745 Universal Joint Group
3p5205 Automatic Pressure Control Valve Group--Type 1
6p3075 Automatic Pressure And Selector Valve Group--Type 1
6p3075 Automatic Pressure And Selector Valve Group
3p5205 Automatic Pressure Control Valve Group--Type 2
3p5205 Automatic Pressure Control Valve Group
6p3075 Automatic Pressure And Selector Valve Group--Type 2
3p4991 Automatic Selector Valve Group
3p4992 Governor Cut-Off Valve Group
7g2612 Pressure Control Valve Group--Part 1 Of 2
7g2612 Pressure Control Valve Group--Part 2 Of 2
3p349 Torque Converter Outlet Relief Valve Group--Type 3
3p348 Torque Converter Inlet Relief Valve Group
3P***48Valve Group-Relief; -Torque Converter Inlet1
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3p349 Torque Converter Outlet Relief Valve Group--Type 1
8p4221 Selector Valve Group
3p216 Sequence And Pressure Control Valve Group
3P***16Valve Group-Sequence & Press Cont1
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7g4102 Shift Pressure Valve Group
6p3526 Shift Pressure Valve Group
9d5800 Rear Wheel Group
Service Equipment And Supplies
Gasket Kits
5P***08Transmission Overhaul0
5P***09Torque Converter0
5P***89Single Cylinder Liner0
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Name Plates And Transfers
1P***76Film-Cat On Side Of Operator Compartment1
2D***80Plate; Serial Number On R.H. Side Of Cylinder Block1
3N***90Plate Serial Number; On R.H. Rear Bank Of Cylinder Block As Viewed From Rear Of Engine1
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Starting And Electrical System
2g380 Air Starting Arrangement
2G***80Air Starting Ar1
2G***70Safety Tread Group1
6D***42Tread-Anti-Skid1
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9d5320 Air Starting Control Group--Side View--Part 1 Of 4
9d5320 Air Starting Control Group--Top View--Part 4 Of 4
9d5320 Air Starting Control Group--Top View--Part 3 Of 4
9d5320 Air Starting Control Group--Side View--Part 2 Of 4
9d4790 Air Starting Wiring Group
9d1329 Alarm Group
5s9088 Alternator Assembly--Part 2 Of 2--Type 1
9s3186 Alternator Group--24 Volt, 50 Ampere
3t1888 Alternator Group--Delco-Remy--24 Volt--50 Ampere--Part 1 Of 2
3T***88Alternator Group-Charging; Alternator Group Delco-Remy 24 Volt, 50 Ampere1
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9g9538 Alternator Group--24 Volt, 50 Ampere
5s9088 Alternator Assembly--Part 2 Of 2--Type 2
5s9088 Alternator Assembly--Part 1 Of 2--Type 2
3t1888 Alternator Group--Delco-Remy--24 Volt, 50 Ampere--Part 2 Of 2
3T***88Alternator Group-Charging; Alternator Group Delco-Remy 24 Volt, 50 Ampere1
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5s9088 Alternator Assembly--Part 1 Of 2--Type 1
5s9088 Alternator Assembly--24 Volt, 50 Ampere--Type 3
3T***88Alternator Group-Charging; Alternator Group Delco-Remy 24 Volt, 50 Ampere1
5S***88Alternator Group-Charging1
9G***38Alternator Group-Charging1
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7d9375 Alarm Group
Batteries And Cables--Part 3 Of 3
Batteries And Cables--Part 2 Of 3
Batteries And Cables--Part 1 Of 3
Batteries And Cables--Parts 3 Of 3
6g2780 Air Starting Control Group--Part 1 Of 3--Type 1
6g2780 Air Starting Control Group--Part 2 Of 3--Type 2
6g2780 Air Starting Control Group--Part 3 Of 3--Type 1
6g2780 Air Starting Control Group--Part 3 Of 3--Type 2
6g2780 Air Starting Control Group--Part 1 Of 3--Type 2
6g2780 Air Starting Control Group--Part 2 Of 3--Type 1
9d6148 Instrument Panel Assembly--Part 2 Of 2
9d6148 Instrument Panel Group--Part 2 Of 2
9d6148 Instrument Panel Group--Part 1 Of 2
9d6148 Instrument Panel Assembly--Part 1 Of 2
6g8333 Diode Assembly
2g8244 Diode Assembly
9d1379 Diode Harness Assembly
Front Lamps And Harness
6g8260 Wiring Harness Assembly--Part 2 Of 2
6g2951 Wiring Harness Assembly
6g8260 Wiring Harness Assembly--Part 1 Of 2
5t3896 Harness Assembly--Field Installation
5t2592 Wiring Harness Assembly
9d8387 Wiring Harness Assembly
7n8292 Fuse Holder, Fuse And Wire Kit--Field Installation
6n7981 Lamp Group--Tail, Stop And Signal
5s5148 Head Lamp Group--24 Volt
5s5147 Head Lamp Group--24 Volt
1m1882 Flood Lamp Group--24 Volt
9d5350 Lighting And Wiring Group--24 Volt--Cab Area--Part 3 Of 5
9d5350 Lighting And Wiring Group--24 Volt--Cab Area--Part 5 Of 5
9d5350 Lighting And Wiring Group--24 Volt--Cab Area--Part 4 Of 5
9d5350 Lighting And Wiring Group--24 Volt--Cab Area--Part 1 Of 5
9d5350 Lighting & Wiring Group--24 Volt--Cab Area--Part 1 Of 5
9d5350 Lighting And Wiring Group--24 Volt--Cab Area--Part 2 Of 5
9d5350 Lighting & Wiring Group--24 Volt--Cab Area--Part 3 Of 5
9d5350 Lighting & Wiring Group--24 Volt--Cab Area--Part 4 Of 5
9d5350 Lighting & Wiring Group--24 Volt--Cab Area--Part 5 Of 5
7m4291 Magnetic Switch Assembly
6n2427 Air Starting Motor Group--Replaced By 3n9411 Shown On Page 131
6n2428 Air Starting Motor Group
0S***88Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter2
0S***89Bolt, Hex. Hd., 5/8"-11 N.C. X 1 3/4"3
0S***94Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly2
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6g310 Instrument Panel Group--Part 2 Of 2
6G***10Panel Group-Instrument; Instrument Panel Group1
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6g340 Instrument Panel Group
2D***49Screw--1/4 Nc Thd. X 3/8"7
6G***10Panel Group-Instrument; Instrument Panel Group1
6G***40Panel Group-Instrument1
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6g310 Instrument Panel Group--Part 1 Of 2
6G***10Panel Group-Instrument; Instrument Panel Group1
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2s3262 Glow Plug And Wiring Group--24 Volt
2S***62Plug & Wiring Group-Glow; Glow Plug And Wiring Group1
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Rear Lamps, Alarm And Harness
7n9847 Electrical Shut-Off Group--24-32 Volt
3t3421 Solenoid Assembly--24 Volt--Field Installation
3t3421 Solenoid Assembly
3t4704 Solenoid Assembly--24 Volt
6g3130 Air Starting Arrangement
6G***80Control Group-Air Starting1
6G***30Starting Ar-Air1
6G***40Tread Group-Safety1
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8h1913 Starting Motor Assembly--24 Volt--Part 2 Of 2--Field Installation
7l8797 Starting Motor Assembly--24 Volt--Part 1 Of 2
8h1913 Starting Motor Assembly--24 Volt--Part 1 Of 2--Field Installation
7l8797 Starting Motor Assembly--24 Volt--Part 2 Of 2
4n8118 Electric Starting Motor Group--Part 2 Of 2
4n8118 Electric Starting Motor Group--Part 1 Of 2
3n9411 Air Starting Motor Group--Field Installation
4n8116 Electric Starting Motor Group
3t3153 Electric Starting Motor Group--Delco-Remy--Part 1 Of 3
3t3153 Electric Starting Motor Group--Delco-Remy--Part 2 Of 3
4n8116 Electric Starting Motor Group--24 Volt
3t2646 Electric Starting Motor Group--24 Volt--Part 1 Of 3
3t3153 Electric Starting Motor Group--Delco-Remy--Part 3 Of 3
3t2646 Electric Starting Motor Group--24 Volt--Part 3 Of 3
3t2646 Electric Starting Motor Group--24 Volt--Part 2 Of 3
Switch And Harness
7n718 Disconnect Switch Assembly
7N***18Switch As-Disconnect; -Battery-Ground Level1
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7h7290 Disconnect Switch Assembly
6n5123 Solenoid Switch Assembly--24 Volt
4m1812 Solenoid Switch Assembly
7n3621 Magnetic Switch Group
4n9600 Coolant Flow Switch Group
4N***00Switch Group-Coolant Flow; Coolant Flow Switch Group1
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Switches And Harness
6g3140 Safety Tread Group
4d487 Check Valve Assembly
4D***87Valve As-Check; -Air Supply-Primary Air Tank-Service Brake Control1
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6g45 Wire Assembly
2g330 Lighting And Wiring Group--24 Volt--Part 3 Of 4
9d4765 Lighting And Wiring Group--24 Volt--Chassis Area
2g330 Lighting And Wiring Group--24 Volt--Cab Area--Part 1 Of 4
2g330 Lighting And Wiring Group--24 Volt--Cab Area--Part 2 Of 4
2g330 Lighting And Wiring Group--24 Volt--Part 3 Of 4--Cab Area
2g330 Lighting And Wiring Group--24 Volt--Cab Area--Part 4 Of 4
6g3150 Air Starting Wiring Group
2g8867 Wiring Harness Assembly--Part 2 Of 2
2g8867 Wiring Harness Assembly--Part 1 Of 2
9d8391 Wiring Harness Assembly
9d1299 Wiring Harness Assembly
Steering And Braking System
3g2351 Accumulator Group
9d4675 Air Tank Group--Cab Area
5t1355 Anti-Spin Control Group--Manual--Top View - Part 2 Of 2
5t1355 Anti-Spin Control Group--Manual--Side View Part 1 Of 2
9d1627 Brake Assembly--R.H.
9D***28Brake Assembly--R.H.,Brake Assembly--L.H.1
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9d8475 Brake Control Group--Cab Area--Part 2 Of 4
9d8475 Brake Control Group--Cab Area--Part 4 Of 4
9d8475 Brake Control Group--Cab Area--Part 3 Of 4
9d8475 Brake Control Group--Cab Area--Part 1 Of 4
9j3375 Brake Control Valve Group
9d2685 Service And Parking Brake Group--Part 1 Of 2
9d2685 Service And Parking Brake Group--Part 2 Of 2
6g5260 Brake Group--L.H.
6g5250 Brake Group--R.H.
9d2850 Service Brake Group
5t8781 Brake Control Group--Chassis
9d8485 Brake Control Group--Chassis Area--Part 1 Of 2
9d8485 Brake Control Group--Chassis Area--Part 2 Of 2
2g3660 Parking Brake Control Group--Cab Area
6g4895 Service Brake Control Group--Part 1 Of 4--Type 1
6g4895 Service Brake Control Group--Cab Area--Part 3 Of 4--Type 2
6g4895 Service Brake Control Group--Cab Area--Part 4 Of 4--Type 2
6g4895 Service Brake Control Group--Cab Area--Part 2 Of 4--Type 1
6g4895 Service Brake Control Group--Cab Area--Part 1 Of 4--Type 2
6g4895 Service Brake Control Group--Cab Area--Part 2 Of 4--Type 2
6g4895 Service Brake Control Group--Cab Area--Part 4 Of 4--Type 1
6g4895 Service Brake Control Group--Cab Area--Part 3 Of 4--Type 1
8j9394 Brake Cylinder Group
9d2715 Steering Gear Group
9d4750 Service Brake Lines Group--Rear--Part 1 Of 3
9d4750 Service Brake Lines Group--Rear--Part 2 Of 3
9d5335 Service Brake Lines Group--Front--Part 1 Of 2
9d4750 Service Brake Lines Group--Rear--Part 3 Of 3
9d5335 Service Brake Lines Group--Front--Part 2 Of 2
2g130 Brake Oil Cooler Lines Group--Part 1 Of 3
2g130 Brake Oil Cooler Lines Group--Part 2 Of 3
2g130 Brake Oil Cooler Lines Group--Part 3 Of 3
5t8785 Service Brake Lines Group--Rear--Part 2 Of 2
5t8785 Service Brake Lines Group--Rear--Part 1 Of 2
9d5345 Supplemental Steering Lines Group
9d4755 Steering Lines Group--Cab & Chassis Area--Part 4 Of 4
9d4755 Steering Lines Group--Cab & Chassis Area--Part 2 Of 4
9d4755 Steering Lines Group--Part 2 Of 4
9d4755 Steering Lines Group--Cab & Chassis Area--Part 3 Of 4
9d4755 Steering Lines Group--Part 1 Of 4
9d4755 Steering Lines Group--Chassis Area--Part 1 Of 2
9d4755 Steering Lines Group--Cab & Chassis Area--Part 1 Of 4
5t8782 Steering Oil Lines Group
9d4755 Steering Lines Group--Part 4 Of 4
9d4755 Steering Lines Group--Part 3 Of 4
9d4755 Steering Lines Group--Chassis Area--Part 2 Of 2
5t8784 Supplemental Steering Lines Group
5T***84Lines Group-Supplemental Steering1
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9d3030 Steering Linkage Group
6g1695 Metering Pump Group
2g6159 Electric Drive Pump Group
2G***59Pump Group-Electric Drive; Electric Drive Pump Group1
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9d9919 Electric Drive Pump Group
9D***19Pump Group-Electric Drive; -Prelubrication1
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6g3050 Metering Pump Group
9d2286 Gear Pump Group--Steering--Single Section
8j6354 Relief Valve Group--Direct Operated
8j9927 Rotochamber Group
2g5900 Slack Adjuster Group
9d3610 Steering Lines Group--Cab Area--Top View
9d4209 Air Tank Group--Chassis Area
2g7320 Air Tank Group--Cab Area
7d8075 Valve Assembly
9j5389 Valve Group
9d338 Check Valve Group
9D***38Valve Group; -Air Pressure Brake1
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2g3594 Air Control Valve Group
2G***94Valve Group-Air; -Parking Brake On, Off1
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9d3886 Air Control Valve Group
9D***86Valve Group-Air Control; -Manual Retarder1
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9d8098 Air Control Valve Group
9D***98Valve Group-Air Control; -Secondary Brake1
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9d3888 Air Control Valve Group
9D***88Valve Group-Air Control; -Retarder Pulled Unit1
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4d3278 Control Valve Assembly
4D***78Valve Group-Air Control; -Parking Brake Switch1
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9d8097 Control Valve Group
9D***97Valve Group-Air Control; -Service Brake1
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5t1300 Air Control Valve Group
6g4672 Air Control Valve Group
1u2646 Brake Valve Group
1u2644 Check Valve Group
1U***44Valve Group-Check; -Secondary, Parking Brake1
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6d3781 Double Check Valve Group
6D***81Valve Group-Check; -Service Brake Diverter-Retarder Control1
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6g7709 Diverter Valve Group
3g2887 Diverter Valve Group
3G***87Valve Group-Diverter; -Towing, Parking Brake Release1
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9j5385 Flow Control Valve Group
9j5386 Flow Control Valve Group--Type 2
9j5386 Flow Control Valve Group--Type 1
7t0300 Valve Group--Shift Pressure
1L***62Ring-Retaining1
1S***36Retainer1
1S***38Ring-Retaining1
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4t844 Relief Valve Group--Pilot Operated
3g4667 Relief Valve Group--Pilot Operated
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9j5390 Relief Valve Group--Pilot Operated
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9d2750 Front Wheel And Axle Group

D348 serial number reference

The D348 is a bare power unit (industrial, marine, vehicular, or generic build), not a tracked machine, so there is no machine PIN plate. The engine identification plate is mounted on the block or flywheel housing and shows a 3-character prefix followed by a sequential number (for example 38J1500). Read the prefix first to confirm which build series the engine belongs to before ordering parts, since the same base engine was sold under at least four separate prefix series, one of which (98S) is not documented on the primary factory prefix chart and should be confirmed with a dealer.

PrefixIdentifies
36JD348 Industrial Engine
38JD348 Marine Engine
57KD348 Vehicular Engine
98SD348 Engine - Machine (generic/unspecified build)

Frequently asked questions

What engine does the Caterpillar D348 use?

The D348 is itself the engine, not a machine that carries one. It is a mechanical four-stroke V12 diesel, twin-turbocharged and water-aftercooled, displacing 29.3 L (1,786 cu in) with a 137 mm x 165 mm (5.4 in x 6.5 in) bore and stroke. Caterpillar built it in industrial, marine, and vehicular arrangements, each carrying its own fuel setting and power rating.

What is the D348's operating weight?

Caterpillar published the D348 as a bare power unit, not a chassis, so there is no factory operating-weight figure the way there would be for a complete machine. A packaged marine or industrial generator set built around it, with skid, alternator, and enclosure, has been documented at roughly 8,167 kg (18,006 lb), but that reflects the packaged set rather than the bare engine, whose standalone weight is not confirmed across available sources.

What replaced the Caterpillar D348?

No official Caterpillar successor model is documented for the D348. It sits in Caterpillar's vintage D3xx big-bore engine family alongside the D343 and D346 but was not directly renamed or superseded by a dedicated follow-on engine. Some owners of D348-powered machines, including the Cat D10 dozer, have repowered with a later Cat 3508 engine once overhaul support got thin, but that is an aftermarket owner choice, not a factory succession.

What D348 owners discuss

What machines actually ran the D348, and does the arrangement matter when shopping for one?
Owners and collectors trace the D348 across three distinct builds: an industrial arrangement, a marine arrangement, and a vehicular arrangement fitted to the D10 dozer and to older haul-truck and wheel-loader production. Long-time Cat enthusiasts note the same base 29.3 L (1786 cu in) V12 got different fuel settings, cooling hardware, and horsepower ratings depending on which arrangement it left the factory as, which is why quoted power figures for "the D348" swing from the low 500s to over 700 hp in different threads. Before buying, match the engine's arrangement and serial-number prefix to the application you actually need parts and documentation for.
Why do people who ran D348-powered trucks in tough production duty describe it as a love-hate engine?
On collector forums, veterans of large earthmoving projects that ran fleets of D348-powered haul trucks around the clock recall it as an engine you either got along with or grew to dread by the end of a long job. The consensus isn't that it was unreliable so much as demanding: a torquey mechanical V12 that rewarded disciplined maintenance and punished neglect under sustained heavy load, typical of pre-emissions Cat iron of its era.
Owners of D10 dozers sometimes talk about swapping the D348 for a 3508. Why repower instead of rebuild?
Threads on D10 repower projects point to the same underlying issue: by the time a D348 needs a major overhaul, sourcing a shop that still supports its mechanical injection pump and governor, plus the specialized machining for its liners and bearings, gets harder every year. Some owners weigh a rebuild against dropping in a later 3500-series engine that has wider parts and service support. That's an owner's cost-and-support decision, not evidence the D348 is a bad engine mechanically.
What wear points do mechanics flag on this V12 after decades of service?
The D348 shares cylinder liners and connecting-rod bearings with its D343 and D346 siblings, so a shop already familiar with that engine family can generally service a D348 bottom end. As with any wet-liner mechanical diesel this old, expect liner and rod-bearing wear, plus governor and injection-pump linkage wear, to be the items an overhaul inspection turns up most often. Compression and blow-by checks before any rebuild decision are standard practice - have a qualified diesel shop verify actual bottom-end condition before committing to parts.
What fuel-system quirks show up on these mechanical pumps after long storage or standby duty?
Mechanical inline injection pumps of this vintage carry an integral governor that meters fuel to hold RPM under load, and that governor can gum up with varnish and asphaltene deposits from aged or poor-quality fuel - a known issue on standby gensets and engines that sit between duty cycles. A gummed governor shows up as hunting, poor load response, or hard starting. Pump and governor calibration needs a proper test stand - have a qualified injection shop verify and recalibrate rather than adjusting linkage in the field.
What should marine and industrial owners watch for on the cooling side?
The marine arrangement was originally cooled through a raw-water heat exchanger, and some owners later converted their setups to keel cooling instead of relying on raw seawater circulation. Separately, Cat revised the aftercooler water-line plumbing more than once across the production run, so cooling-circuit hardware from one serial range doesn't always bolt straight onto another. Confirm your engine's actual serial range before assuming cooling parts are interchangeable.
What should a buyer check before taking on a used D348?
Confirm which arrangement it is (industrial, marine, or vehicular) and its serial prefix, since fuel, cooling, and rating all differ by arrangement. Ask for hours and full rebuild history, since most surviving units are now well past their original service life and many running examples have already been through at least one overhaul. Check whether the injection pump and governor have a working local rebuild/calibration source, since that support is thinner than it was even a decade ago. Inspect liners and rod bearings for wear consistent with the hours claimed, and verify the cooling circuit hardware matches the engine's actual serial range rather than assuming a generic fit. On any engine this old, have a qualified dealer or diesel shop verify mechanical condition before you rely on seller claims alone.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

Serial-range & configuration variants

This page covers the Caterpillar D348. Related factory variants of the same model family:

D348D348D348

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