Caterpillar D20D
Caterpillararticulated dump truckarticulated truck

Caterpillar D20D

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar D20D is a legacy two-axle articulated dump truck built in the early 1990s, part of Cat's D-series ADT lineup carrying serial prefix 9MG (9MG00001 and up). It sits in the roughly 20-ton payload class, powered by a Caterpillar 3116 mechanical unit-injection (MUI) diesel — 6-cylinder, 6.6 L, about 160-164 kW (214-219 hp) — with a mechanical governor and no electronic control module, so it predates Cat's flash-code diagnostics entirely. Operating weight runs about 17.3 t (38,150 lb) with a rated payload near 22.7-22.8 t (50,265 lb). Cat documented the D20D in a combined operation-and-maintenance and machine-systems manual shared with the larger D250D, its close in-family sibling; no separate wheel or engine configuration options are documented for the D20D beyond this single build.

The D20D belongs to the D-series wave Caterpillar launched around 1989, tracing back to Cat's 1985 acquisition of the DJB articulated-truck design, and it sat below the D250D/D300D/D350D/D400D siblings in payload class. By the mid-to-late 1990s Cat moved the range to an E-series (D250E, D300E, and so on), and by the early 2000s renumbered the whole articulated-truck line into the 700-series (725, 730, 735, 740, 745). No source documents a direct nameplate successor to the D20D itself, so treat it as an orphaned predecessor to Cat's modern small-class ADTs rather than a machine with a clean one-to-one replacement. In the used and parts market it survives mainly because the 3116 engine is mechanically simple and rebuildable without electronics, and because it shares parts commonality with the D250D — appealing to quarries and contractors running low-cost tonnage without emissions-era complexity, even as OEM stock for this generation keeps thinning.

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 D20D specifications

Engine

Engine modelCat 3116 DITA (direct injection, turbocharged, aftercooled)
Cylinders6, inline
Displacement6.6 L
Gross powerApprox. 160-164 kW (214-219 hp); figures vary by source/rating standard

Weights

Operating weight (empty)17.3 t (38,150 lb)
Rated payloadApprox. 22.7-22.8 t (50,265 lb)

Dimensions

Overall length9.60 m (31 ft 7 in)
Overall width2.50 m (8 ft 2 in)
Overall height3.21 m (10 ft 7 in)
Dump height6.22 m (20 ft 5 in)

Performance

Dump angle55 degrees
Travel speed / gradeabilityNot published in available sources for this model; verify with your dealer using the machine's serial number

Service capacities (summary)

Fuel, hydraulic, cooling, engine oil capacitiesNot published in available sources for this model; verify with your dealer or the operator's manual for exact serial range

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

D20D fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (with filter)Not documented in publicly available sources for this exact D20D (9MG-prefix) serial range — capacity varies by configuration, verify against the OMM or with your dealerCat DEO (Diesel Engine Oil), viscosity graded by ambient temperature per Cat's multigrade oil chart for the 3116 engine — lighter grades in cold climates, heavier (15W-40 class) in warm climates
Cooling systemNot documented in publicly available sources for this exact D20D serial range — verify against the OMM or with your dealerCat DEAC (Diesel Engine Antifreeze/Coolant), mixed to the ratio specified for the expected ambient temperature range; later production may instead call for Cat ELC full-strength premix — confirm generation before topping off
Fuel tankNot confirmed for D20D specifically; a closely related same-family sibling truck lists roughly 450 L (118.9 US gal), but this figure is not verified as applying to the D20D — treat as unconfirmed and check the OMMNo. 2-D diesel fuel per Cat's fuel specification; switch to a winterized/cold-weather blend below 0 C (32 F)
Transmission (powershift)Not documented in publicly available sources for this exact D20D serial range — verify against the OMM or with your dealerCat TDTO (Transmission/Drivetrain Oil), grade selected by ambient temperature at startup
Final drives (each)Not documented in publicly available sources for this exact D20D serial range — verify against the OMM or with your dealerCat TDTO (Transmission/Drivetrain Oil)
Axles/differentials (front and rear)Not documented in publicly available sources for this exact D20D serial range — verify against the OMM or with your dealerCat TDTO (Transmission/Drivetrain Oil)
Hydraulic system (tank and circuit)Not documented in publicly available sources for this exact D20D serial range — verify against the OMM or with your dealerCat TDTO (Transmission/Drivetrain Oil), the common cross-compatible reservoir fluid used on Cat wheeled machines of this generation; where the OMM instead calls for a dedicated hydraulic fluid, use a Cat HYDO-class anti-wear hydraulic oil of the specified viscosity
Grease (chassis and pivot points)Spec only — no reservoir capacity appliesCat Multipurpose Grease (Cat MPGM); Cat Extreme Application or Advanced 3Moly grease for heavily loaded pivot and hitch points where specified

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

Caterpillar D20D maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and top off as needed
  • Check engine coolant level on the wet-liner 3116
  • Drain water and sediment from the fuel tank and primary fuel filter/water separator
  • Inspect the articulation hitch, hitch pins, and lock cylinder for play or leaks
  • Walk-around check of tires, rims, and dump-body linkage for damage
  • Grease the articulation joint, hitch pins, and hoist-cylinder pivots weekly
Every 250 h
  • Change engine oil and filter (Cat DEO-class oil)
  • Replace primary and secondary fuel filters
  • Check power-shift transmission oil level
  • Lubricate all chassis, hitch, and hoist-cylinder grease points
  • Inspect drive shafts, U-joints, and center bearing for wear
  • Check alternator belt tension and condition
Every 500 h
  • Change transmission oil and filter (Cat TDTO-class fluid)
  • Check front and rear differential and final-drive oil levels
  • Check hoist (dump) hydraulic tank oil level and inspect the return filter
  • Pull engine, transmission, differential, and hydraulic oil samples for S·O·S analysis
  • Inspect service and parking brake components for wear
  • Check turbocharger mounting and boost hoses for leaks
Every 1,000 h
  • Change hoist/hydraulic system oil and filter
  • Change front and rear differential and final-drive oils
  • Inspect and adjust engine valve lash and injector timing on the 3116 MUI engine
  • Inspect articulation hitch bushings and center pin for wear
  • Check engine and transmission mounts for cracking or looseness
  • Test parking brake holding capacity
Every 2,000 h
  • Change engine coolant or test and renew corrosion-inhibitor concentration
  • Re-check and reset valve lash and fuel injection timing on the 3116 engine
  • Inspect power-shift transmission clutch packs and torque converter for wear
  • Inspect frame rails and the oscillating hitch structure for cracks
  • Inspect or rebuild service brake calipers/discs on the tandem rear axle
  • Check and repack wheel bearings
Every 4,000 h
  • Inspect and, if worn, overhaul the 3116 engine top end (liners, pistons, injectors)
  • Inspect or rebuild power-shift transmission clutch packs and the torque converter
  • Inspect and rebuild front and rear final-drive planetary sets
  • Reseal hoist cylinders and inspect the hoist pump for wear
  • Full structural inspection of the frame, articulation hitch, and dump-body pivots

Servicing the D20D beyond the schedule

Predictive Maintenance & Fluid Analysis

The D20D's 3116 MUI engine carries no ECM, so there are no fault codes to flag developing wear — scheduled S·O·S sampling of engine oil, power-shift transmission oil, front/rear differential and final-drive oil, and hoist hydraulic oil is the main early-warning tool on this truck. Watch engine oil for injector and wet-liner wear metals, coolant for liner-cavitation byproducts, and hydraulic oil for hoist-pump and cylinder wear given repetitive dump cycles. Track trends interval to interval since this generation offers no onboard diagnostics.

Corrective & Common Repairs

Typical D20D repairs center on the oscillating articulation hitch — bushings, center pin, and lock-cylinder wear from constant frame movement — plus 3116 mechanical unit injector recalibration or replacement, fuel transfer pump wear, and wet-liner seal leaks common to this engine family. Tandem rear-axle final-drive and differential seals are frequent leak points, and power-shift transmission clutch wear shows up as slipping or delayed shifts. Tire and rim wear runs high given the truck's roughly 22.7 t rated payload.

Overhaul & Rebuild Points

At high hours, expect a 3116 top-end rebuild — liners, pistons, and injectors — as mechanical unit injection wears with age and use. Power-shift transmission clutch packs and the torque converter form the next major wear group, followed by front and rear final-drive planetary sets and differential bearings. The oscillating hitch bushings, center pin, and hoist cylinders warrant full inspection at overhaul, and given this machine's age, frame rails and the hitch structure need a hard look for fatigue cracking.

Seasonal & Environment Servicing

In cold climates, check coolant concentration closely — the 3116's wet-sleeve liners are sensitive to cavitation, and its mechanical injection pump is prone to fuel gelling, so use a proper winter-blend fuel and cold-start aid if equipped. In hot, dusty quarry or pit environments, service the air filter and clean radiator and aftercooler fins more often, and step up grease intervals on the articulation hitch and driveline U-joints where mud and abrasive fines accelerate wear on this wheeled chassis.

D20D fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
Engine Oil Pressure warning lamp (red)Engine oil pressure has dropped below the safe threshold set by the pressure switch/sender.Low oil level, worn oil pump, plugged suction screen, or a failed sender/switch.Stop the engine immediately, check oil level, and inspect the oil pressure sender before restarting.
Coolant Temperature warning lamp (red)Engine coolant temperature has exceeded the normal operating range.Low coolant level, blocked radiator core, slipping or broken fan belt, or a thermostat stuck closed.Reduce load, let the engine idle to cool, then check coolant level and the cooling system for restrictions.
Charging System warning lamp (red) / ammeter dischargeAlternator output is below battery system voltage; the electrical system is running on battery power only.Failed alternator, broken or slipping drive belt, or a loose/corroded charging circuit connection.Check the alternator belt tension first, then test alternator output and wiring at the battery terminals.
Torque Converter Oil Temperature warning lamp (amber/red)Torque converter oil temperature is above normal operating range.Low transmission/converter oil level, prolonged high-load lugging in a low gear, or a blocked oil cooler.Reduce load and shift to a lower gear range to unload the converter, then check oil level and cooler for restriction.
Brake System (hydraulic brake oil) warning lamp (red)Hydraulic pressure supplying the service brakes has dropped below the safe operating threshold.Low hydraulic oil level, a failing brake charging pump, or a leak in the brake accumulator circuit.Stop the truck in a safe location, set the parking brake, and check hydraulic oil level and accumulator charge pressure before moving again.
Parking Brake Engaged indicator lamp (amber)Parking brake is applied.Operator has set the parking brake, or the park brake has not fully released.Confirm the parking brake control is fully released before attempting to drive the truck.
Hydraulic Filter Bypass indicator (amber, mechanical pop-up button)Hydraulic oil filter has reached its restriction limit and oil is bypassing the filter element unfiltered.Clogged filter element, cold/high-viscosity oil at startup, or extended service interval.Replace the hydraulic filter element and check oil condition; reset the indicator after service.
Air Cleaner Service Indicator (mechanical gauge, not an electrical lamp)Engine air intake restriction has reached the service limit.Clogged or saturated air filter element from dust ingestion.Service or replace the air filter element and reset the restriction indicator.

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

D20D attachments & work tools

Dump body / haul box

D20D is a two-axle articulated haul truck, not a work-tool carrier, so the only "attachment" choice is the dump body itself. This size class runs a standard dual-slope or flat-floor steel dump body sized for its rated payload class; exact heaped/struck volume for this specific model is not confirmed across sources - verify with your dealer or the machine's data plate.

Tailgate

Tailgate is an optional fitment on this D-series generation, not standard equipment - a sibling model in the same family (D250D) is documented as leaving the factory without a tailgate unless specified. Where fitted, it is a hinged/gravity-release gate bolted to the body, aimed at retaining fine or wet material rather than quarry rock.

Sideboards and tail extensions

Bolt-on sideboards and tail extensions are available to raise volumetric capacity for light, low-density material (soil, mulch, aggregate fines). These are body add-ons, not hydraulic work tools, and mounting is by bolted flanges to the existing body rails.

Body liner / wear protection

Wear-resistant liner plates or reinforcement inserts for the body floor and lower sides are a common option across this haul-truck class to reduce abrasion in rock or quarry duty; specific D20D liner part offerings are not documented in available sources - treat as a dealer-fit option, not a confirmed factory line item.

Cab guarding (ROPS/FOPS canopy)

An operator cab/canopy meeting rollover and falling-object protective structure criteria is offered as a factory or dealer-fit option across this articulated-truck class. Confirmation of a specific canopy part offering for the D20D itself is not available - treat as class-typical, verify against the specific serial/configuration.

Traction aid / differential lock

A lockable differential or traction-control arrangement for soft-ground and off-road hauling is common across this era and class of Caterpillar articulated truck. No source ties a confirmed differential-lock offering specifically to the D20D chassis, so this should be treated as a possible option pending dealer verification, not a confirmed spec.

Articulation hitch (frame joint, not a work-tool coupler)

The D20D uses an oscillating articulated-frame hitch joining the front and rear frame sections - this is the machine's steering/oscillation joint, documented in the shared D20D/D250D machine-systems manual, not a quick-coupler for interchangeable work tools. This truck class does not use loader/excavator-style hydraulic quick-couplers.

Engine and driveline note (for attachment-hydraulics context)

D20D is powered by a Caterpillar 3116 diesel (9MG-prefix serial range). Body hoist and any body-mounted hydraulic options draw from the machine's own hydraulic system; there is no separate work-tool hydraulic kit or auxiliary circuit documented for this model, consistent with its role as a fixed-body haul truck rather than an attachment carrier.

All D20D assemblies by section

Every catalogued assembly group for the Caterpillar D20D. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Attachments
7u9464 Air Conditioner Ar
10***73Compressor Group.-Refrigerant; Compressor Gp. Refrigerant1
10***59Air Conditioner Group. (Basic)1
2U***90Air Conditioner Lines Group.1
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1045159 Air Conditioner Gp. (Basic)
2u6990 Air Conditioner Lines Gp.
7u8800 Cooler Gp-Brake Oil
2u9707 Wheel Chock Group
7u9046 Circuit Breaker Panel Gp (Retarder Installed)
7U***46Circuit Breaker Panel Group (Retarder Installed)1
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1012034 Circuit Breaker Panel Gp.
10***34Circuit Breaker Panel Group. (Retarder Installed)1
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8t9761 Clutch & Refrigerant Compressor Gp
8T***61Compressor Group-Clutch & Refrig1
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1021973 Compressor Gp.-Refrigerant
10***73Compressor Group.-Refrigerant; Compressor Gp. Refrigerant1
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1071699 Control Gp-Brake
10***99Control Group-Brake; Control Gp-Brake (Q)1
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8e3096 Covers Gp - Shipping (Retarder Installed)
2u7197 Tailgate Cylinder Mounting Gp
6u0492 Cylinder Gp-Tailgate
2u8879 Elbow Gp-Exhaust
2u8028 Elbow Gp-Exhaust
2u9811 Electrical Ar-Tuv (23.5 Tyres)
7u9003 Electrical Gp (Retarder Installed)
7U***03Electrical Group (Retarder Installed)1
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7u9015 Electrical Gp-Remote Start
1012409 Electrical Gp-Retarder
3z5606 Engine Water Jacket Heater
8y5874 Extension Gp-Backrest
8Y***74Extension Group-Backrest; Backrest Extension Group1
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2u9816 Fastener Gp. Chain
2u9012 Fender Gp-Rear (Tuv)
1012032 Front Wiring And Lighting Gp.-Retarder Fitted (Part 2 Of 2)
10***32Front Wiring And Lighting Group1
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1012032 Front Wiring And Lighting Gp. - Retarder Fitted (Part 1 Of 2)
10***32Front Wiring And Lighting Group1
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2u7126 Gage Gp - Warning
8y6862 Housing Gp-Seat Suspension
1012408 Instrument Panel Gp.(Retarder Installed)
10***08Instrument Panel Group (Retarder Installed)1
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1012033 Instrument Panel Gp. (Retarder Installed)
10***33Instrument Panel Group. (Retarder Installed)1
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2u9548 Ladder Gp.
1013172 Lamp Gp-Head
7u9466 Liner Ar Body
7u9472 Liner Ar Body
7u7510 Main (Transmission) Drive Shaft Gp (Retarder Installed)
7u3904 Mirror Gp
2u9508 Mirror Gp. - Rear View
2u6991 Mounting And Condenser Gp.
2u6992 Mounting And Receiver Gp.
2u8370 Operator Warning Gp.
2U***70Operator Warning Group; Warning Gp. - Operator1
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8y5992 Pan Gp-Seat
2u7133 Panel Gp-Circuit Breaker
2u7130 Panel Gp-Instrument
7u3659 Switch Panel Gp.
2u7123 Panel Gp-Switch
7u6871 Panel Gp.-Switch (Start)
2u7170 Panel Gp-Switch (Start)
2u7250 Piping Ar-Exh (Body Heat)
2u8095 Piping Ar-Exhaust (Body Heat)
2u9747 Warning Gp-Wide Vehicle
2u6615 Pump Lines Gp. (Retarder Installed)
1088700 Rear View Mirror Group
7u7346 Retarder Arrangement
10***09Electrical Group-Retarder1
10***99Control Group-Brake; Control Gp-Brake (Q)1
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6634 Retarder Control Group
6y5889 Retarder Gp (W/Housing)
7y3792 Seat Belt Gp
8Y***92Seat Belt Group; -Retractable-Operator1
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8y5986 Seat Gp-Basic
8Y***86Seat Group; Seat Gp-Basic (Fabric) (Lumbar)1
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8y6137 Seat Gp-Suspension
8Y***92Seat Belt Group; -Retractable-Operator1
8Y***74Extension Group-Backrest; Backrest Extension Group1
8Y***82Suspension Group-Seat; Suspension Gp-Seat (Variable)1
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7u7777 Seat Gp.
7u9470 Suppression Ar. Sound
7U***70Suppression Ar. Sound; Suppression Ar Spec Sound1
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1035874 Suppression Ar.-Sound (Tuv)
10***74Suppression Ar.-Sound (Tuv)1
2U***38Suppression Group-Sound (Tuv)1
7U***70Suppression Ar. Sound; Suppression Ar Spec Sound1
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2u9738 Suppression Gp-Sound (Tuv)
8y5982 Suspension Gp-Seat
8Y***82Suspension Group-Seat; Suspension Gp-Seat (Variable)1
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2u8853 Switch Gp-(Retarder)
2u8893 T.U.V. Arrangement (23.5 Tires)
2u7195 Tailgate Gp
2u7196 Tailgate Lines Gp
2u9807 Tbg. Arrangement (6ng)
2u9970 Tbg. Arrangement (9mg)
7u9488 Tire Option Ar (23.5r25)
6y5892 Retarder & Torque Converter Gp
6Y***92Torque Converter & Retarder Group; Retarder & Torque Converter Gp1
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6y5920 Torque Converter Ar (Retarder Installed)
6Y***92Torque Converter & Retarder Group; Retarder & Torque Converter Gp1
6Y***20Torque Converter Ar; Convertor Ar-Torque1
8E***96Covers Group-Shipping1
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6y5893 Torque Converter Gp
1239564 Transfer Gp-French
10***08Film-Elec Disconnect Cab Tilt (French)1
10***70Plate-Cab Prop Pin Warning (French)1
12***64Transfer Group-French1
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2u8671 Transfer Gp-French
10***08Film-Elec Disconnect Cab Tilt (French)1
10***70Plate-Cab Prop Pin Warning (French)1
1S***99Plate - Hitch Warning (French)2
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1239556 Transfer Gp-German
10***09Film-Elecdisconnect Cabtilt (German)1
10***73Plate-Cab Prop Pin Warning (German)1
12***56Transfer Group-German1
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2u7029 Transfer Gp-German
10***09Film-Elecdisconnect Cabtilt (German)1
10***73Plate-Cab Prop Pin Warning (German)1
1S***47Plate-Warning; (No Clearance, German)2
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1239568 Transfer Gp-Portugese
10***11Film-Notice1
10***72Plate-Warning; (Cab Prop Pin)1
12***68Transfer Group-Portugese1
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2u9716 Transfer Gp-Portugese
10***11Film-Notice1
10***72Plate-Warning; (Cab Prop Pin)1
1S***46Film; -Warning: 1 -On Front Vertical Face Of Platform(R.H.) 1 - On Fuel Tank2
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1239566 Transfer Gp-Spanish
10***10Film-Notice1
10***71Plate-Warning; (Cab Prop Pin)1
12***66Transfer Group-Spanish1
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2u9715 Transfer Gp-Spanish
10***10Film-Notice1
10***71Plate-Warning; (Cab Prop Pin)1
1S***00Plate-Warning; (No Clearance)(Machine Turn Clearance)2
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2u9971 Transfer Gp. Paint & (Tbg)
2u9817 Transfer Gp. Paint & (Tbg)
2u6540 Transmission Oil Lines Gp.-Retarder Installed (Part 3 Of 3)
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6540 Transmission Oil Lines Group-Retarder Installed (Part 2 Of 3)
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6540 Transmission Oil Lines Group-Retarder Installed (Part 1 Of 3)
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u9471 Valve Group-Selector (Retarder Installed)
7u4381 Valve Gp. C-Bal
2p5802 Valve Gp - Retarder Control
2u7404 Warning And Gauge Gp (Retarder Installed)
2U***04Warning And Gauge Group (Retarder Installed)1
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2u7129 Warning Gp.-Operator
1045673 Washer & Wiper Gp - (Rear)
2u9833 Washer & Wiper Gp - (Rear)
3t7062 Wiper Gp
Basic Engine
2w9608 Camshaft Gp-Single
4w3462 Carrier Gp-Seal
4W***62Carrier Group-Seal; Carrier Group (Seal)1
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4w2108 Cover Gp-Cylinder Block
7l0004 Cover Gp-Front
7L***04Cover Group-Front; (Front Housing)1
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4p5603 Cover Gp-Valve Mechanism
9y1224 Cover Gp-Sound Suppression
9Y***24Cover Group-Valve Mechanism; (Sound Suppression)1
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9y7620 Cover Gp-Valve Mechanism
6i1158 Cover Gp-Sound Suppression
6I***58Cover Group-Valve Mechanism; (Sound Suppression)1
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4w2197 Crankshaft Gp
4W***97Crankshaft Group; Crankshaft Group1
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7e2482 Cylinder Block Gp*R
7E***82Cylinder Block Group; Cylinder Block Group1
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7c5826 Cylinder Block Gp
1291095 Cylinder Block Gp
1004948 Cylinder Block Gp
1077720 Cylinder Head As*R
1193065 Cylinder Head As
4p8262 Cylinder Head As
1193067 Cylinder Head As
1077609 Cylinder Head As
1154107 Cylinder Head As
1051770 Cylinder Head As
9y8871 Cylinder Head Gp
4p8264 Cylinder Head Gp
4p8263 Cylinder Head Gp*R
9y8850 Cylinder Head Gp*R
1154165 Cylinder Head Gp*R
7e4191 Damper & Pulley Gp
7c0044 Drive Gp-Fan
7C***44Drive Group-Fan; Fan Drive Group1
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7u8034 Engine Mounting Gp.
9y8789 Flywheel Gp.
7e0519 Flywheel Gp
2w8475 Gear Gp-Front
2W***75Gear Group-Front; Front Gear Group1
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4w1103 Housing Gp-Flywheel
7l0002 Housing Gp-Front
4w2515 Lifting Gp
1154089 Piston & Rod Gp
9y8543 Piston & Rod Gp
4w5429 Pulley Gp-Crankshaft
4W***29Pulley Group-Crankshaft; Crankshaft Pulley Group1
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7c6077 Rocker Arm Gp-Valve
1077722 Rocker Arm Gp-Valve
7e7590 Seal Gp-Crankshaft
7E***90Seal Group-Crankshaft; Crankshaft Seal Group1
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1154120 Seal Gp-Crankshaft
7c1770 Seal Gp-Flywheel Housing
7e1717 Support Gp-Engine
7E***17Support Group-Engine; Support Gp - Engine1
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2w9607 Valve Mechanism Gp
2W***07Valve Mechanism Group; Fuel Pump And Valve Mechanism Group1
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Braking System
8x7186 Brake Gp
8X***86Brake Group-Hydraulic Caliper Service1
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2u8769 Cab Brake Control Gp (Part 1 Of 2)
2u8769 Cab Brake Control Gp (Part 2 Of 2)
7u7598 Front Brake Control Gp.
2u6674 Mounting And Accumulator Gp.
1053654 Park Brake Control Gp.
7u7601 Rear Brake Control Gp.
7u7600 Rear Brake Control Gp. (6 X 4 Only)
7u7599 Rear Brake Control Gp.
2u7332 Valve Gp.
Cab, Gauges And Accessories
7u9349 Air Filter Gp.
9g9813 Alarm Gp-24 Volt
9G***13Alarm Group; -Action-Action, Engine Overspeed1
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7u9456 Basic Heater Gp.
7u9333 Cab Door Gp.
7u9938 Cab Heater Gp.
7u9816 Cab Liner Gp.
2u9293 Cab Prop Gp.
6u9941 Cylinder Gp.
7u9346 Cab Visor Gp.
7u9817 Cab Window Gp.
7u6796 Cab Wiring And Lighting Gp.
7u7332 Cab Wiring And Lighting Gp. (Without Retarder)
7U***32Cab Wiring And Lighting Group (Without Retarder)1
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1012031 Cab Wiring And Lighting Gp. (Part 1 Of 2) (Retarder Installed)
10***31Cab Wiring And Lighting Group. (Retarder Installed)1
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1012031 Cab Wiring And Lighting Gp. (Part 2 Of 2) (Retarder Installed)
10***31Cab Wiring And Lighting Group. (Retarder Installed)1
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2u7136 Cab Wiring And Lighting Gp. Part 1 Of 2 (Without Retarder)
2U***36Cab Wiring And Lighting Group. (Without Retarder)1
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2u7136 Cab Wiring And Lighting Gp. (Part 2 Of 2) (Without Retarder)
2U***36Cab Wiring And Lighting Group. (Without Retarder)1
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1012034 Circuit Breaker Panel Gp. (Retarder Installed)
10***34Circuit Breaker Panel Group. (Retarder Installed)1
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2u8074 Circuit Breaker Panel Gp. (Without Retarder)
2U***74Circuit Breaker Panel Group. (Without Retarder)1
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7u7484 Circuit Breaker Panel Gp. (Without Retarder)
7U***84Circuit Breaker Panel Group. (Without Retarder)1
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7u9343 Companion Seat Gp.
7u9937 Governor Pedal Gp.
7u9939 Heater Lines Gp.
7u0190 Hood Latch Group
7u0191 Hood Latch Group
7u0191 Hood Latch Gp.
2u8372 Instrument Panel Gp.
2u8371 Instrument Panel Gp.
1012033 Instrument Panel Gp. (Retarder Installed)
10***33Instrument Panel Group. (Retarder Installed)1
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8c9678 Lamp Gp-Dome
7N***79Socket-Governor Solenoid Wire To Housing2
7N***80Pin-Connector; (14-Ga To 18-Ga)1
7N***82Housing (Plug) (To Lift Kickout Switch)1
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9x1439 Lamp Gp-Flood
9X***39Lamp Group-Flood; -Rear-Ladder Access-Engine Work Light1
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7u9936 Cab Mounting Gp.
2u8212 Operator Warning Gp.
7u3660 Switch Panel Gp.
2u8765 Platform Tilt Gp.
7u7290 Pump Gp.
1029371 Push Switch As.
1068178 Seat As
8y4031 Seat Belt Gp.
8y4029 Seat Belt Gp
6u8770 Seat Belt Kit Gp.
7u9940 Seat Gp.
7u9819 Sound Suppression Liner Gp.
7u9339 Steering Control Gp.
2u9967 Steering Control Gp.
1026182 Switch Panel Gp. (Start)
7u9125 Transmission Control Gp
7u7199 Warning And Gauge Gp.
7u7164 Warning And Gauge Gp.
7u6782 Washer Gp.
7u9818 Window Guard Gp.
7u9818 Window Guard Gp
3e5147 Wiper Gp. - Basic
7u6783 Wiper Gp.
Chassis
2u6662 Box Gp-Battery
2u6662 Battery Box Gp
7u7379 Battery Support Gp.
2u6180 Center Axle Oil Lines Guard Gp.
2U***80Center Axle Oil Lines Guard Group1
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7u7378 Crankcase Guard Gp
7u9512 Dump Body Gp.
7u9515 Dump Body Gp.
7u8386 Dust Guard Gp.
7u8396 Rear Frame Gp.
7u7382 Frame Lock Link Gp
7u7374 Front Frame Gp.
7u8392 Grease Lines Gp. (Hitch)
2u9997 Grease Lines Gp. Front
7u9789 Engine Hinged Hood Group
7u9789 Engine Hinged Hood Gp.
7u8393 Grease Lines Gp. (Hitch)
7u9904 Oscillating Hitch Gp.
7u9790 Platform Guard Gp.
2u6672 Radiator Guard Gp
2u6181 Rear Axle Oil Lines Guard Gp.
2U***81Rear Axle Oil Lines Guard Group1
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2u9141 Rear Axle Oil Lines Guard Gp.
2U***41Rear Axle Oil Lines Guard Group1
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7u8395 Rear Frame Gp.
2u6019 Rear Suspension Cylinder Gp
2U***19Rear Suspension Cylinder Group.1
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1086454 Rear View Mirror Group
7u9792 Rear View Mirror Gp.
7u9791 Step Gp
7u8437 Steer Stop Gp.
7u9787 Support And Fender Gp.
7u9788 Support And Fender Gp.
7u9786 Transmission Guard Gp.
7u8930 Tread Gp.
2U***70Coating-Safety Walk 6inch2
7U***30Tread Group.1
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2u6590 Walkway Group
Cooling System
9y1645 Aftercooler Gp
9Y***45Aftercooler Group-Treated Water1
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6i1222 Aftercooler Gp-Treated Water
7u8800 Brake Oil Cooler Gp.
7u8791 Coolant Lines Gp.
1006269 Cooler Gp-Engine Oil
4w2913 Cooler Gp-Engine Oil
4p8184 Cooler Gp-Engine Oil
4P***84Cooler Group-Engine Oil; Engine Oil Cooler Group1
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7c6998 Drive Gp-Water Pump
7C***98Drive Group-Water Pump; Water Pump Drive Group1
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1143064 Fan Group
7u9745 Fan Gp.
7e4272 Lines Gp-Water
7e4189 Pulley Gp
4p4187 Pump Gp-Water
1077756 Pump Gp-Water
9y6688 Pump Gp-Water
9y5250 Pump Gp-Water-*R
1077757 Pump Gp-Water
4p4186 Pump Gp-Water
7u8790 Tank And Radiator Gp.
7u8859 Transmission Oil Cooler Gp.
Decals And Service Equipment
8e3096 Covers Gp - Shipping (Retarder Installed)
9w6101 Cover Gp - Shipping
8e3097 Covers Gp - Shipping (Without Retarder)
Miscellaneous Parts
2u6719 Truck Shipping Arrangement
2u7023 Transfer Gp-English
2u7025 Transfer Gp-English
Engine Arrangement
9y8271 Engine Ar-Part 1 Of 3
10***69Cooler Group-Engine Oil1
1N***77Breather Group; Breather Group1
2W***08Camshaft Group-Single1
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7e7907 Engine Ar-Part 1 Of 2
10***69Cooler Group-Engine Oil1
1N***76Filter Group-Fuel1
1N***77Breather Group; Breather Group1
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9y8271 Engine Ar-Part 3 Of 3
10***41Kit-Gasket; (Fuel System)0
10***42Kit-Gasket; (Oil Cooler, Lines)0
10***57Pump Group-Water1
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7e7907 Engine Ar-Part 2 Of 2
10***41Kit-Gasket; (Fuel System)0
10***42Kit-Gasket; (Oil Cooler, Lines)0
10***57Pump Group-Water1
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9y8271 Engine Ar-Part 2 Of 3
1N***76Filter Group-Fuel1
2W***75Gear Group-Front; Front Gear Group1
2W***07Valve Mechanism Group; Fuel Pump And Valve Mechanism Group1
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Fuel System And Governor
7w6989 Control Gp-Fuel Injection
7W***89Control Group-Fuel Injection; Fuel Injection Control Group1
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7e9429 Control Gp-Governor
7e8794 Drive Gp-Governor & Transfer Pump
7E***94Drive Group-Gov & Transfer Pump1
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4p5614 Drive Gp-Governor & Transfer Pump
4P***14Drive Group-Gov & Transfer Pump1
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7e4665 Drive Gp-Governor & Transfer Pump
7E***65Drive Group-Gov & Transfer Pump1
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7w4812 Fastener Gp-Governor
7W***12Fastener Group-Governor; Fastener Group(Governor) (~1c K5811)1
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6i2693 Filter Gp-Fuel
6I***93Filter Group-Fuel; Fuel Filter Group (2z F3772-Up)1
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1n3476 Filter Gp-Fuel
612596 Fitting Gp
06***96Fitting Group1
3K***60Seal Pilot Manifold On; Seal To Boom Check Valve Drain0
6V***38Connector-O-Ring0
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7u9543 Fuel Lines Gp.
2u6521 Fuel Tank Gp.
7e3263 Governor Gp
4p4356 Governor Gp-Unit Injector-Type 2
4p9298 Governor Gp-Unit Injector
1307323 Governor Gp
4p5793 Governor Gp-Unit Injector
4P***57Governor Group-Unit Injector1
4P***93Governor Group-Unit Injector; Governor Gp-Unit Injection1
4P***98Governor Group-Unit Injector1
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4p4357 Governor Gp-Unit Injector
4p5502 Governor Gp-Unit Injector
4p9086 Governor Gp-Unit Injector
6i4267 Governor Gp-Unit Injector
4p4356 Governor Gp-Unit Injector-Type 1
4p5794 Governor Gp-Unit Injector
4P***56Governor Group-Unit Injector1
4P***94Governor Group-Unit Injector1
4P***86Governor Group-Unit Injector1
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9y3943 Lines Gp-Air Fuel Ratio Cont
9Y***43Lines Group-Air Fuel Ratio Cont; Air Fuel Ratio Control Lines Group1
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7c9651 Lines Gp-Fuel Filter
7w8434 Lines Gp-Governor Oil
7W***34Lines Group-Governor Oil; Governor Oil Lines Group1
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7e7607 Pump Gp-Fuel Injection
7E***07Pump Group-Fuel Injection; Fuel Injection Pump Group1
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8n5251 Pump Gp-Fuel Prime & Prim Fltr
8N***51Pump Group-Fuel Prime & Prim Filter1
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8n3365 Pump Gp-Fuel Priming
8N***65Pump Group-Fuel Priming; Priming Pump-Fuel & Primary Filter1
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7e9305 Pump Gp-Fuel Priming & Primary Filter
7E***05Pump Group-Fuel Prm & Prim Filter; Pump Gp-Fuel Priming & Primary Filter1
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Intake And Exhaust System
9y1645 Aftercooler Gp
9Y***45Aftercooler Group-Treated Water1
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6i1222 Aftercooler Gp-Treated Water
7u9500 Air Cleaner Gp.
7u9500 Air Cleaner Gp
2u6889 Air Lines Gp.
7u9505 Air Lines Gp.
6i2278 Cartridge Gp-Turbocharger Gp*R
4p4686 Cartridge Gp-Turbocharger*R
4p7713 Cartridge Gp-Turbocharger
7c5624 Cartridge Gp-Turbocharger
7u3933 Filter Change Indicator Gp.
7U***33Indicator Group-Air Filter Change1
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7c6213 Lines Gp-Air
7c2476 Lines Gp-Turbocharger Oil
7c2472 Manifold Gp-Exhaust
4w3480 Manifold Gp-Inlet
4W***80Manifold Group-Inlet; Inlet Manifold Group1
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2u8427 Muffler Gp.
2u8428 Muffler Gp.
9y6484 Turbocharger Gp
4p7708 Turbocharger Gp
4p4682 Turbocharger Gp*R
9y6485 Turbocharger Gp
4p4683 Turbocharger Gp
4p7599 Turbocharger Gp
Lubrication System
1n3477 Breather Gp
7c5033 Cover Gp-Sound Suppression
4p8183 Filter Gp-Engine Oil
4P***83Filter Group-Engine Oil; Engine Oil Filter Group1
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7c0271 Filter Gp-Engine Oil
7w8420 Fumes Disposal Gp
7W***20Fumes Disposal Group; Fumes Disposal Group1
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4p0852 Gauge Gp-Oil Level (Dipstick)
4P***52Gauge Group-Oil Level (Dipstick)1
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4w2914 Lines Gp-Engine Oil
2u7762 Oil Pan Drain Lines Gp.
4w0269 Pan Gp-Oil
1192924 Pump Gp-Engine Oil
4w2195 Pump Gp-Engine Oil
4W***95Pump Group-Engine Oil; Engine Oil Pump Group1
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2w8625 Pump Gp-Engine Oil*R
Power Train-Power Transmission Unit
7u7612 Axle Gp-Trailing (6 X 4 Only)
7u7609 Breather Gp. (Center And Rear Axles)
7u7610 Breather Gp. (Rear Axle)
2u9551 Breather Gp. (Front Axle)
7u7607 Breather Gp. (Front Axle)
6y0581 Case & Parts Gp-Planetary
6Y***81Case & Parts Group; Case & Parts Gp-Planetary1
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7u7422 Center Axle Gp.
6y9252 Control Gp-Transmission Hyd-Part 2 Of 2
1122601 Control Gp-Transmission Hyd-Part 1 Of 2
11***01Control Group-Transmission; Control Gp-Transmission Hydraulic1
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1122601 Control Gp-Transmission Hyd-Part 2 Of 2
11***01Control Group-Transmission; Control Gp-Transmission Hydraulic1
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6y9252 Control Gp-Transmission Hyd-Part 1 Of 2
8x7580 Differential & Bevel Gear Gp
8X***80Differential & Bevel Gear Group1
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8x7573 Differential Gp
2u7570 Differential Gp.
6p4603 Filter Gp-Transmission Oil-With Housing
6P***03Filter Group-Oil; -Park Brake Release, Xmsn-Parking Brake Release-Rear Brakes1
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7u7421 Front Axle Gp.
1158312 Six Wheel Drive Transfer Gear Gp.
7u7320 Hitch Drive Shaft Gp.
7u7435 Hitch Drive Shaft Gp.
7u9528 Universal Joint Gp.
7u7508 Main (Transmission) Drive Shaft Gp.
7U***08Main (Transmission) Drive Shaft Group.1
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7u7509 Main (Transmission) Drive Shaft Gp. (Without Retarder)
7U***09Main (Transmission) Drive Shaft Group.1
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7u7510 Main (Transmission) Drive Shaft Gp (Retarder Installed)
2u6537 Mounting And Filter Gp.
2u6803 Mounting And Filter Gp.
2u9623 Mounting Gp.-Torque Convertor
2U***23Mounting Group.-Torque Convertor1
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6y4419 Planetary Gp-Part 1 Of 2
6y4419 Planetary Gp-Part 2 Of 2
8p8208 Pump Gp-Gear
1t1810 Pump Gp-Gear-2 Section
8p8207 Pump Gp-Gear
7u7424 Rear Axle Gp.
7u7423 Rear Axle Gp.
7u7503 Rear Drive Shaft Gp.
7u7505 Rear Drive Shaft Gp. (6 X 4 Only)
2u6634 Retarder Control Group
6y5889 Retarder Gp (W/Housing)
7u7748 Magnetic Screen Gp.
2u8046 Drive Shaft Gp.
7u7507 Front Drive Shaft Gp.
7u7504 Rear Drive Shaft Gp.
6u7046 Tire And Wheel Rim Gp. (20.5 X 25 Tires)
2u6632 Tire And Wheel Rim Gp - 6 Installed (23.5 X 25 Tires) - 9mg1-Up
2U***32Tire And Wheel Rim Group.-6 Installed1
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6y5892 Torque Converter & Retarder Gp
6Y***92Torque Converter & Retarder Group; Retarder & Torque Converter Gp1
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6y5963 Torque Coverter Ar (Without Retarder)
6Y***63Torque Converter Ar1
6Y***64Torque Converter Group-W/Hsg1
8E***97Covers Group-Shipping1
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6y5920 Torque Converter Ar (Retarder Installed)
6Y***92Torque Converter & Retarder Group; Retarder & Torque Converter Gp1
6Y***20Torque Converter Ar; Convertor Ar-Torque1
8E***96Covers Group-Shipping1
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1t1886 Torque Converter Gp-With Housing-Part 2 Of 2
6y5965 Torque Converter Gp (Without Retarder)
1t1886 Torque Converter Gp-With Housing-Part 1 Of 2
6y5893 Torque Converter Gp
1t1885 Torque Converter Gp
6y5964 Torque Converter Gp-With Housing (Without Retarder)
7u6711 Transfer Gear Gp. (Part 1 Of 2)
1121515 Transmission Ar
11***15Transmission Ar1
11***01Control Group-Transmission; Control Gp-Transmission Hydraulic1
6Y***81Case & Parts Group; Case & Parts Gp-Planetary1
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6y5801 Transmission Ar
6Y***81Case & Parts Group; Case & Parts Gp-Planetary1
6Y***19Planetary Group-Transmission1
6Y***01Transmission Ar1
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7u7235 Transmission Mounting Gp.
7u9313 Transmission Oil Lines Gp. Part 2 Of 3
7u9313 Transmission Lines Gp. Part 2 Of 2
7u9313 Transmission Oil Lines Gp. Part 3 Of 3
7u9313 Transmission Oil Lines Gp. - Part 1 Of 2
7u9313 Transmission Oil Lines Gp. Part 1 Of 3
2u6540 Transmission Oil Lines Group - Retarder Installed Part 1 Of 3
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6540 Transmission Oil Lines Group - Retarder Installed Part 2 Of 3
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6540 Transmission Oil Lines Group - Retarder Installed - Part 2 Of 3
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6540 Transmission Oil Lines Group - Retarder Installed - Part 3 Of 3
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6540 Transmission Oil Lines Group - Retarder Installed Part 3 Of 3
2U***40Transmission Oil Lines Group - Retarder Installed1
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2u6540 Transmission Oil Lines Gp - Retarder Installed - Part 1 Of 3
2U***40Transmission Oil Lines Group - Retarder Installed1
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7u9314 Transmission Oil Lines Gp. Part 1 Of 3
7u9314 Transmission Oil Lines Gp.-Part 2 Of 3
7u9314 Transmission Oil Lines Gp. Part 3 Of 3
7u9314 Transmission Oil Lines Gp. Part 2 Of 3
7u9314 Transmission Oil Lines Gp.-Part 3 Of 3
2u8560 Universal Joint Gp.
2U***60Universal Joint Group; Joint Gp.-Universal1
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2u8559 Universal Joint Gp.
2U***59Universal Joint Group1
2U***60Universal Joint Group; Joint Gp.-Universal0
7U***81Universal Joint Group; Joint Gp.-Universal0
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7u7308 Universal Joint Gp.
7u9881 Universal Joint Gp.
7U***81Universal Joint Group; Joint Gp.-Universal1
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9p3058 Valve Gp-Transmission Control
2u9471 Valve Group - Selector (Retarder Installed)
2u6051 Valve Group - Solenoid
9p3060 Valve Gp-Manifold & Reducing
9P***60Valve Group-Manifold & Reducing1
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2p3675 Valve Gp-Pressure Relief
2P***75Valve Group-Relief; Valve Gp-Pressure Relief1
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6y0620 Valve Gp-Selector
1122602 Valve Gp-Selector
9p3059 Valve Gp-Selector & Press Cont
9P***59Valve Group-Selector & Press Cont1
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8x7185 Wheel & Final Drive Gp
Starting And Electrical System
7e6335 Alternator Gp-Charging
1005045 Alternator Gp-Charging
10***45Alternator Group-Charging; (Nippondenso)1
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5n5692 Alternator Gp-Charging-Part 2 Of 2*R
5N***92Alternator Group-Charging; Alternator Gp (See Page 25)1
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1005047 Alternator Gp-Charging
10***45Alternator Group-Charging; (Nippondenso)1
10***46Alternator Group-Charging; -24-Volt, 50-Ampere1
10***47Alternator Group-Charging; -24-Volt, 50-Ampere1
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5n5692 Alternator Gp-Charging-Part 1 Of 2*R
5N***92Alternator Group-Charging; Alternator Gp (See Page 25)1
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1005046 Alternator Gp-Charging
10***46Alternator Group-Charging; -24-Volt, 50-Ampere1
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7u9744 Ether Start Aid Gp.
2u9688 Front Wiring And Lighting Gp. Part 2 Of 2
2U***88Front Wiring And Lighting Group1
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1063861 Front Wiring And Lighting Gp. Part 1 Of 2
10***61Front Wiring And Lighting Group1
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1063861 Front Wiring And Lighting Gp. Part 2 Of 2
10***61Front Wiring And Lighting Group1
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7u6793 Front Wiring And Lighting Gp. Part 2 Of 2
7U***93Front Wiring And Lighting Group1
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1065047 Front Wiring And Lighting Gp. (Retarder Installed) Part 2 Of 2
10***47Front Wiring And Lighting Group1
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2u7142 Front Wiring And Lighting Gp. Part 2 Of 2 (Without Retarder)
2U***42Front Wiring And Lighting Group1
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7u7333 Front Wiring And Lighting Gp. Part 1 Of 2 (Without Retarder)
7U***33Front Wiring And Lighting Group1
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1012032 Front Wiring And Lighting Gp. - (Retarder Installed) Part 1 Of 2
10***32Front Wiring And Lighting Group1
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1012032 Front Wiring And Lighting Gp. - (Retarder Installed) Part 2 Of 2
10***32Front Wiring And Lighting Group1
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7u6793 Front Wiring And Lighting Gp. Part 1 Of 2
7U***93Front Wiring And Lighting Group1
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1065047 Front Wiring And Lighting Gp. (Retarder Installed) Part 1 Of 2
10***47Front Wiring And Lighting Group1
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2u9688 Front Wiring And Lighting Gp. Part 1 Of 2
2U***88Front Wiring And Lighting Group1
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7u7333 Front Wiring And Lighting Gp. Part 2 Of 2 (Without Retarder)
7U***33Front Wiring And Lighting Group1
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2u7142 Front Wiring And Lighting Gp. Part 1 Of 2 (Without Retarder)
2U***42Front Wiring And Lighting Group1
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1065046 Front Wiring And Lighting Gp. (Without Retarder)-Part 2 Of 2
10***46Front Wiring And Lighting Group.1
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1065046 Front Wiring And Lighting Gp. (Without Retarder)-Part 1 Of 2
10***46Front Wiring And Lighting Group.1
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1014356 Lamp Gp-Head-Lh
9x7169 Lamp Gp
9x7170 Lamp Gp-Head
1055007 Lamp Gp-Head(Lh)
1055008 Lamp Gp-Head(Rh)
9x1407 Lamp Gp-Signal
9X***07Lamp Group-Signal; -24-Volt-Front1
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8c6207 Lamp Gp-Signal
8C***07Lamp Group-Signal; (Stop, Tail, Red)(Stop/Tail Red)1
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7x6066 Lamp Gp-Signal
7X***66Lamp Group-Signal; (Rear, Turn, Park)1
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1070205 Lamp Gp. - L.H. (Rear)
1070206 Lamp Gp. - R.H. (Rear)
7u6788 Rear Lighting And Wiring Gp.
2u9687 Rear Lighting And Wiring Gp.
1071008 Rear Lighting And Wiring Gp.
7u6787 Rear Lighting And Wiring Gp.
9x5524 Solenoid As
7c4028 Solenoid Gp-Shut-Off-24 Volt Dc, Boss Mounted.
1068558 Starting Motor Gp-Electric*R
10***57Starting Motor Group-Electric; Electric Starting Motor Group (Robert Bosch)1
10***58Starting Motor Group-Electric1
10***59Starting Motor Group-Electric; Electric Starting Motor Group (Delco Remy)1
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3e2298 Starting Motor Gp-Electric
3E***98Starting Motor Group-Electric; Starting Motor Group (Delco Remy)1
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9y1945 Starting Motor Gp-Electric
1068557 Starting Motor Gp-Electric
10***57Starting Motor Group-Electric; Electric Starting Motor Group (Robert Bosch)1
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9x9995 Starting Motor Gp-Electric
3E***98Starting Motor Group-Electric; Starting Motor Group (Delco Remy)1
8C***73Starting Motor Group-Electric; Starting Motor Group (Robert Bosch)1
9X***95Starting Motor Group-Electric1
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1068559 Starting Motor Gp-Electric
10***59Starting Motor Group-Electric; Electric Starting Motor Group (Delco Remy)1
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8c4773 Starting Motor Gp-Electric
8C***73Starting Motor Group-Electric; Starting Motor Group (Robert Bosch)1
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2u8047 Lighting And Back Up Warning Gp.
7u6791 Wiring And Battery Gp.
1071009 Wiring Gp-Lighting - Rear
2u7137 Wiring Gp-Lighting - Rear
Steering And Hydraulic System
7u6405 Cylinder Gp - Hoist
1478507 Cylinder Gp - Hoist
2u8713 Drain Lines Gp. (Part 1 Of 2)
2u8876 Drain Lines Gp. (Part 2 Of 2)
2u8876 Drain Lines Gp. (Part 1 Of 2)
2u8713 Drain Lines Gp. (Part 2 Of 2)
1071245 Front Hoist Oil Lines Gp.
2u8877 Front Hoist Oil Lines Gp.
2u8712 Front Hoist Oil Lines Gp.
7u9172 Hoist Cylinder And Mounting Gp.
7U***72Hoist Cylinder And Mounting Group1
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7u9171 Hoist Cylinder And Mounting Gp.
7U***71Hoist Cylinder And Mounting Group1
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7u7400 Hoist Cylinder Gp.
7u9161 Hoist Valve And Mounting Gp.
7u9222 Hydraulic Tank Gp.
2u8874 Pilot Lines Gp.
2u8711 Pilot Lines Gp.
7u9096 Pump And Mounting Gp.
7u9189 Pump And Mounting Gp.
7u9120 Pump And Mounting Gp.
7u7307 Pump Gp - Piston (Slipper) Part 2 Of 2
7u7307 Pump Gp - Piston (Slipper) Part 1 Of 2
6e5290 Pump Gp-Metering
9t9433 Pump Gp-Metering
7u6875 Pump Gp. (Part 1 Of 2)
7u6875 Pump Gp. (Part 2 Of 2)
7u7358 Pump Gp. Piston (Slipper) (Part 2 Of 2)
7u7358 Pump Gp. Piston (Slipper) (Part 1 Of 2)
7u9160 Pump Lines Gp.
7u9159 Pump Lines Gp. (Without Retarder)
2u6615 Pump Lines Gp. (Retarder Installed)
7u9170 Rear Hoist Oil Lines Gp.
2u6255 Rear Hoist Oil Lines Gp.
2u9965 Steer Valve And Mounting Gp.
7u7971 Steer Valve And Mounting Gp.
7u7383 Steering Cylinder And Mounting Gp.
7U***83Steering Cylinder And Mounting Group1
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7u6404 Steering Cylinder Gp.
2u8875 Steering Gp. (Part 2 Of 2)
2u8875 Steering Lines Gp. (Part 2 Of 2)
2u8710 Steering Lines Gp. (Part 1 Of 2)
2u8875 Steering Lines Gp. (Part 1 Of 2)
2u8710 Steering Lines Gp. (Part 2 Of 2)
1051487 Valve Gp.
1142073 Valve Gp.
6e2542 Valve Gp
2u7047 Valve Gp.
2U***47Valve Group-Pump Control; (Pressure, Flow Compensator)1
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6e3448 Valve Gp-Relief
6e3447 Valve Gp-Relief
6E***47Valve Group-Relief; -Pump Backup1
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6e2543 Valve Gp-Steering
6e6646 Valve Gp-Steering
2u8070 Valve Gp. - Check
Suspension
2u7538 Front Suspension Accumulator Gp.
7u7384 Suspension Mounting And Cylinder Gp.
7U***84Cylinder & Mtg Group-Suspension1
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7u8132 Front Suspension Cylinder Gp
7u7230 Suspension Cylinder Gp.
7u9506 Center Axle Suspension Frame Gp.
7u7375 Front Suspension Frame Gp.
2u8709 Front Suspension Lines Gp.
7u8477 Rear Suspension Gp.
7U***77Suspension Group-Rear Equalizer1
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D20D serial number reference

The PIN/serial plate on the D20D is riveted to the frame near the articulation hitch, typically on the front frame rail visible from the left side. Read the first three characters as the prefix (identifies model and build series), then the following digits as the sequential unit number, e.g. 9MG00049.

PrefixIdentifies
9MGD20D articulated dump truck, only confirmed configuration

Frequently asked questions

What engine does the Caterpillar D20D use?

The D20D runs a Caterpillar 3116 diesel in its mechanical unit-injection (MUI) form — 6-cylinder, 6.6 L, producing roughly 160-164 kW (214-219 hp). It uses a mechanical governor with no electronic control module, so it predates Cat's electronic engine diagnostics entirely.

What is the D20D's operating weight?

Operating weight is approximately 17.3 t (38,150 lb), with a rated payload near 22.7-22.8 t (50,265 lb).

What replaced the Caterpillar D20D?

No documented model picked up the D20D nameplate directly. Caterpillar folded the D-series into an E-series (D250E, D300E, and so on) through the 1990s, then renumbered its whole articulated-truck line into the 700-series (725 through 745) by the early 2000s — treat the D20D as a legacy predecessor to that lineup rather than a machine with a named one-to-one successor.

What D20D owners discuss

What do owners and mechanics actually say about the D20D on forums and enthusiast sites?
Discussion naming the D20D specifically is thin online. It was a low-volume early-1990s two-axle hauler built for a short run before Cat moved on to later truck generations, and most surviving write-ups treat it as a footnote to the larger D250D it shares machine systems with. Where operators of same-era 3116-powered Cat equipment do compare notes, the recurring themes are engine fuel-system quirks, hoist and hitch wear, and sensor wiring faults. Treat those as patterns across the 3116 engine family and this class of articulated hauler rather than as D20D-specific field reports.
What engine quirks come up most often for the D20D's 3116 diesel?
The D20D runs the direct-injection, turbocharged-and-aftercooled Cat 3116. Across 3116 applications, the most repeated complaint is injector cup failure: the o-rings at the injector tip harden and leak, and owners often mistake the resulting oil-in-fuel or smoke symptom for a head gasket or ring problem. Oil cooler seepage is the other common one, since the cooler relies on just two o-rings for its seal. Hard starting after sitting overnight, traced to loss of fuel prime, and erratic power loss that turns out to be a fuel system or injector fault rather than a mechanical one, both come up often too. None of these are unique to the truck application; they track the engine family across on- and off-highway uses.
How does the dump hoist and articulation joint typically behave as these trucks age?
Across this class of two-axle articulated hauler, the dump-body hoist and the center articulation joint are the two areas owners watch closest. The hoist cylinder, reservoir, and pump should raise and lower the body smoothly with no hesitation, leaking, or corrosion at the seals; hunting or delayed response points to pump wear or a sticking valve. The articulation (hitch) joint and its steering cylinders take load on every turn, and play here is a red flag since a worn hitch is one of the costliest repairs on this type of machine. Test both with the machine stationary and a second person watching from a safe distance, and have your dealer verify hitch and hoist condition before relying on the result.
What wear patterns are typical on the frame, pins, and tires?
Hinge pins at the dump body and hoist mounts see full load every cycle and need bushing attention on a shorter interval than most other pins on the machine. Check for play by raising the empty body and watching for movement when it stops. Tires on a two-axle articulated hauler take heavy side-loading from turning in soft ground, so uneven tread wear usually points to an alignment or articulation problem rather than the tire itself. Brakes and the drive axles round out the high-wear points reported across this machine class.
What electrical or sensor issues come up on the 3116?
Wiring at the engine speed sensor, mounted on the bell housing, is a known weak point on the 3116; chafed or corroded wiring there causes erratic running or hard starting that looks like a fuel problem at first. General ECM wiring and connector corrosion is the other common thread, and cleaning and re-seating connectors often resolves faults that first look like a sensor or module failure. Confirm any fault code with a proper diagnostic read rather than swapping parts on a guess.
What should a buyer check before purchasing a used D20D?
Because this model is out of production and thinly documented, confirm the serial prefix (9MG) and pull a full maintenance history before committing, since parts sourcing and reference material will lean on the shared D250D documentation. Walk the hitch and articulation joint and the hoist system first, since play or leaks there are the most expensive repairs on this truck class. Check tires for uneven wear tied to alignment, inspect hinge pins for play under a raised body, and run the engine cold to check for hard starting or smoke that points to injector cup or oil cooler o-ring wear on the 3116. Given the age of any surviving unit, have your dealer verify hitch, hoist, and axle condition with a full inspection before purchase.

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

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