Caterpillaroff-highway trucktractor
Caterpillar 768B
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 768B is a fifth-wheel off-highway tractor, not a dump truck. It carries no dump body of its own; it tows a separate bottom-dump wagon built for Caterpillar by Athey Products. Cat built the 768B from 1971 to 1978 under the 79S serial prefix, sharing its chassis, D343T/D343TA turbocharged diesel, and powershift driveline with the rigid-dump 769B. The engine is rated around 309 kW (415 hp) gross flywheel power. Unloaded tractor weight runs about 21.9-22 t (48,000-48,500 lb), varying by configuration and serial range. Partway through the production run, near S/N 79S00080, Caterpillar switched from an early fiberglass cab to a steel cab and made front disc brakes standard alongside the existing rear discs.
Across the run the 768B picked up the same running changes as its 769B sibling: the steel cab replaced the fiberglass unit, front brakes went from optional to standard, and gross engine output settled at its final rating. There are no electronics and no diagnostic codes here - it is a mechanically governed, pre-ECM machine serviced entirely on hour meters and manual gauges. Caterpillar never built a direct successor in this fifth-wheel, wagon-towing niche; the 769C that followed the 769B in 1978 was a redesigned rigid dump truck with its own engine, transmission, and dump body. That leaves surviving 768B tractors a niche find today, valued mainly by vintage mining and quarry fleets and collectors. Engine, driveline, and axle parts cross over from the far more common 769B, while hitch and wagon-specific components are scarce since Athey Products is long gone from the market.
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 768B specifications
Engine
| Engine model | Cat D343TA, in-line 6-cylinder, 4-stroke-cycle diesel, turbocharged and aftercooled |
| Rated power (flywheel, gross) | 415 hp (309 kW) |
| Displacement | 14.6 L (893 cu in) |
| Bore x stroke | 137 mm x 165 mm (5.4 in x 6.5 in) |
| Governed speed | 550 rpm low idle; about 2,000 rpm full-load governed speed |
| Emissions certification | None. Built before EPA/Tier emissions regulation applied to this class; not applicable |
Weights
| Operating weight (tractor unit) | About 22,000 kg (48,500 lb). Figure is for the 768B tractor alone, before hitching a trailer |
| Shipping/base weight | Not separately published for this model; treat as close to the operating weight figure above |
Dimensions
| Transport length | 6.55 m (21 ft 6 in) |
| Transport width | 3.61 m (11 ft 10 in) |
| Transport height | 3.48 m (11 ft 5 in) |
| Standard tire size | 18.00 x 33 |
| Turning radius, outside | 18 m (59 ft) |
Performance
| Configuration | Fifth-wheel tractor built to pull bottom-dump trailers. It runs the same engine and driveline as the 769B rigid dump truck but carries no mounted dump body of its own |
| Rated combination load | Period literature lists about 20 cu yd (15.3 cubic m), which applies to the towed bottom-dump trailer paired with this tractor, not an onboard body |
| Transmission | Powershift automatic |
| Starting system | Electric or air start |
| Brakes | Rear disc service brakes with front brakes and a separate emergency brake circuit |
| Suspension | Pneumatic chassis suspension |
| Travel speed / gradeability | Not published for this tractor configuration in available literature. Check your dealer or the applicable service manual for governed road speed on your unit |
Service capacities (summary)
| Fuel tank capacity | Not documented for this model in available literature. Verify with your dealer or the D343TA engine service manual |
| Hydraulic system capacity | Not documented for this model in available literature. Verify with your dealer or service manual |
| Engine oil (crankcase) capacity | Not documented for this model in available literature. Verify with your dealer or the D343TA engine service manual |
| Cooling system capacity | Not documented for this model in available literature. Verify with your dealer or the D343TA engine service manual |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
768B fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) - Cat D343 diesel, 415 hp gross at 1900 rpm | Not independently confirmed for this chassis; general references for the industrial D343 cite roughly 38 L (10 US gal), but this figure is not corroborated against the 768B/769B chassis lubrication chart - verify against the OMM for the exact serial range before servicing. | Cat Series 3 heavy-duty diesel engine oil (period equivalent of today's Cat DEO). Use SAE 30 in normal ambient temperatures, SAE 10W or 10W-30 in cold weather, per the era lubrication chart for D343-powered machines. |
| Cooling system | Approximately 102 L (27 US gal), per the combined 768B tractor / 769B truck chassis service data (both share the same D343 engine and cooling package). | Full-strength ethylene glycol-base coolant with a Cat-approved corrosion/cavitation inhibitor, mixed per climate. Later Cat coolant lines (Cat ELC/DEAC) are the modern equivalent additive package for this cooling system. |
| Fuel tank | Approximately 511 L (135 US gal), per the shared 768B/769B chassis service data. | No. 2-D diesel fuel for normal operation; No. 1-D diesel fuel blended in for cold-weather starting and flow. |
| Transmission / torque converter (powershift) | Not separately documented in available sources for this model - on this Cat truck generation the transmission and torque converter typically share a common sump with the brake/steering hydraulic circuit. Confirm the exact split against the OMM for this unit. | Cat TO-2 powershift transmission fluid (the period fluid later superseded by Cat TDTO/TO-4 spec). Grade by climate: SAE 30 in normal conditions, SAE 10W in cold weather. |
| Final drives (each, rear) | Approximately 12.5 L (3.3 US gal) per side, per the shared 768B/769B chassis service data. | Cat TO-2 final drive and axle oil (superseded by Cat TDTO/TO-4 spec). SAE 30 in normal climates, SAE 50 in sustained hot climates. |
| Steering hydraulic system | Approximately 48.5 L (12.8 US gal), per the shared 768B/769B chassis service data. | Cat TO-2 hydraulic oil (period fluid, later folded into the Cat TDTO/HYDO spec family). Graded by climate the same as the transmission fluid. |
| Brake hydraulic system (includes dump-hoist circuit on the rigid dump-truck version) | Documented at approximately 227 L (60 US gal) on the rigid dump-truck (769B) variant, which includes the dump-body hoist circuit. The 768B is a tractor unit with no dump body or hoist cylinders, so its brake/hydraulic reservoir is smaller than this figure and is not separately confirmed in available sources - verify against the OMM for the tractor configuration. | Cat TO-2 hydraulic/brake oil (period fluid, later Cat TDTO/HYDO equivalent). Graded by climate per the era lubrication chart. |
| Grease (spec only) | Not applicable - lubricated by grease gun at scheduled service points, not a sump fill. | Cat Multipurpose (NLGI EP) chassis grease for pins, bushings, and linkage points; a moly-fortified EP grease at the trailer hitch/fifth-wheel and other high-load pivot points where called for. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 768B maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the 768B beyond the schedule
Predictive Maintenance & Fluid Analysis
The 768B predates onboard diagnostics - the D343TA has no ECM and throws no fault codes, so scheduled oil sampling is the real early-warning system. Pull engine oil, powershift transmission/torque converter oil, and final drive oil samples on a fixed hour interval and watch for rising metal content, which flags turbocharger bearing wear, clutch-pack wear, or planetary gear wear before a failure strands the tractor mid-haul. Test coolant condition and check disc-brake oil (where cooled) for contamination too.
Corrective & Common Repairs
Expect wear at the fifth-wheel hitch plate and wagon drawbar pin first - that joint carries every pulling and braking load between tractor and Athey wagon and loosens with hours. The D343TA's turbocharger seals and boost lines are next, followed by oil-cooled disc brake wear plates on both axles. Powershift clutch packs slip as discs wear, and pneumatic suspension struts develop slow air leaks at the seals. Steering hydraulic hoses harden with age and should be checked on every repair visit.
Overhaul & Rebuild Points
Plan an in-frame overhaul of the D343TA around major hour milestones - rebuild the turbocharger, injectors, and cylinder kits together rather than piecemeal. Pull the powershift transmission and torque converter for a clutch and seal rebuild on the same schedule; both share the engine's duty cycle pulling a loaded bottom-dump wagon. Rebuild final drive planetaries and wheel bearings at the same interval, and inspect the fifth-wheel hitch casting and frame rails for fatigue cracking before returning the tractor to service.
Seasonal & Environment Servicing
Cold starts on a mechanically governed D343TA need ether or glow-plug aids and a coolant heater below freezing - there's no electronic cold-start assist to fall back on. In hot, dusty mining or quarry sites, service the air cleaner more often and check turbocharger inlet ducting for dust bypass. In wet or coastal duty, drain fuel-tank condensation often and protect the steel cab, frame, and fifth-wheel hitch from corrosion, since exposed pivot pins and the wagon coupling see constant load and moisture.
768B common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 6H-6000 | Film-Warning Left Side Of Filter Opening On Seat Frame | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
768B attachments & work tools
Bottom-dump trailer (wagon)
The 768B is a tractor-only unit with no integrated dump body of its own; it tows a separate articulated bottom-dump trailer supplied by a specialist trailer builder for Cat. Exact wagon capacity is not consistently documented for this tractor, and published rock-truck-class figures (around 20 cu yd / 15 m3, or nominal 30+ ton payload) likely describe the companion rigid-body truck rather than the tractor's own wagon; treat any single capacity figure as configuration-dependent and verify with your dealer.
Trailer coupling / hitch
The attachment interface on this chassis is a rigid, articulated drawbar-type hitch that couples the tractor frame to the bottom-dump wagon, not a bucket or blade quick-coupler. No loader-, dozer-, or excavator-style work tools mount to this frame.
Cab and ROPS
The B-series update brought an all-steel cab, replacing the fiberglass cab used on the first-generation tractor-and-truck pairing. Both open ROPS canopy and enclosed steel-cab configurations were used across the production run, matching the cab used on the rigid-body truck it shares its chassis with.
Engine and driveline
Shares its Caterpillar diesel and PowerShift transmission with the rigid-body truck it was derived from; published output for this engine family is quoted at roughly 400-415 hp depending on source and turbocharging arrangement (varies by configuration/series). No separate hydraulic work-tool circuit is fitted, since the unit carries no bucket, blade, or fork attachments.
Running gear
Pneumatic tires and suspension are sized to the tractor-wagon combination's gross weight class, with rear disc brakes carried over from the paired rigid-truck chassis. No dozer blade, ripper, or snow-wing options are documented for this tractor.
Factory guarding / options
Documented factory options are limited to cab enclosure type (open canopy vs. steel cab) and engine start system (electric or air start). No attachment or work-tool accessory line is published for this model, consistent with its role as a dedicated wagon-hauling tractor rather than a loader or dozer platform.
All 768B assemblies by section
Every catalogued assembly group for the Caterpillar 768B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Attachments
7d7450 Fuel Tank Adapter Group--Fast Fill
| 7D***50 | Adapter Group | 1 |
7d7440 Fuel Tank Adapter Group--Fast Fill--Type 1
| 7D***40 | Adapter Group | 1 |
7d7440 Fuel Tank Adapter Group--Fast Fill--Type 2
| 7D***40 | Adapter Group | 1 |
8d9725 Adjustable Seat Group
| 8D***25 | Adjustable Seat Group | 1 |
2g7713 Air Dryer Group
| 2G***13 | Air Dryer Group | 1 |
9m4824 Air Motor Assembly
| 9M***24 | Air Motor Assembly | 1 |
6n7855 Air Motor Group--Type 2
| 6N***55 | Air Motor Group | 1 |
6n7855 Air Motor Group--Type 1
| 6N***55 | Air Motor Group | 1 |
7s7702 Air Starting Arrangement
| 6N***56 | Air Starting Motor Group | 1 |
| 7D***35 | Electrical System Group | 1 |
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 1 Of 2--Type 1
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 1 Of 2--Type 3
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 1 Of 2--Type 2
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 2 Of 2--Type 3
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 2 Of 2--Type 1
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 2 Of 2--Type 4
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 2 Of 2--Type 2
| 7D***20 | Air Starting Control Group | 1 |
7d7820 Air Starting Control Group--Part 1 Of 2--Type 4
| 7D***20 | Air Starting Control Group | 1 |
6n7876 Air Starting Motor Group
| 6N***76 | Air Starting Motor Group | 1 |
7m2212 Air Starting Motor Group
| 7M***12 | Air Starting Motor Group | 1 |
6n7856 Air Starting Motor Group
| 6N***56 | Air Starting Motor Group | 1 |
8d2510 Air Starting Wiring Group
| 8D***10 | Air Starting Wiring Group | 1 |
4j1943 Air Valve Assembly
| 4J***43 | Air Valve Assembly | 1 |
7d6540 Auxiliary Starting Group--24 Volt--Type 2
| 7D***40 | Auxiliary Starting Group | 1 |
7d6540 Auxiliary Starting Group--24 Volt--Type 1
| 7D***40 | Auxiliary Starting Group | 1 |
7d6600 Back-Up Light And Warning Group--24 Volt
| 7D***00 | Back-Up Light And Warning Group | 1 |
7d9375 Basic Alarm Group--Type 1
| 7D***75 | Basic Alarm Group | 1 |
7d9375 Basic Alarm Group--24 Volt--Type 2
| 7D***75 | Basic Alarm Group | 1 |
8d500 Brake Control Group--As Viewed From Front Of Machine-Part 2 Of 2
| 8D***00 | Brake Control Group | 1 |
8d500 Brake Control Group--As Viewed From Left Hand Side Of Machine--Part 1 Of 2
| 8D***00 | Brake Control Group | 1 |
8d8340 Brake Lines And Tank Group--Field Installation
| 8D***40 | Brake Lines And Tank Group | 1 |
9d4490 Brake Lines And Tank Group--Field Installation
| 9D***90 | Brake Lines And Tank Group | 1 |
7m8274 Brake Master Cylinder Assembly
| 7M***74 | Brake Master Cylinder Assembly | 1 |
7d6636 Cab Heater Group--24 Volt
| 7D***36 | Cab Heater Group | 1 |
8d246 Cab Visor Group
| 8D***46 | Cab Visor Group | 1 |
7j5855 Check Valve Group
| 7J***55 | Check Valve Group | 1 |
7n4297 Clutch And Refrigerant Compressor Group
| 7N***97 | Clutch & Refrig Compressor Group | 1 |
1p2780 Refrigerant Compressor Group
| 1P***80 | Compressor Group-Refrigerant | 1 |
5d1910 Protection Cover Group--Hydraulic Tank Cap
| 5D***10 | Cover Group-Protection; Protection Cover Group Hydraulic Tank Cap | 1 |
9d630 Dust Cover Group
| 9D***30 | Cover-Dust | 1 |
9m3946 Differential And Bevel Gear Group--Top View
| 9M***46 | Differential And Bevel Gear | 1 |
7d8840 Differential Group--No Spin
| 7D***40 | Differential Group | 1 |
1s4860 Drive Assembly
| 1S***60 | Drive Assembly | 1 |
7d746 Electric Drive Pump Assembly
| 7D***46 | Electric Drive Pump Assembly | 1 |
7d6635 Electrical System Group--24 Volt
| 7D***35 | Electrical System Group | 1 |
8d620 Emergency Brake Control Group--Top View--Part 2 Of 3--Type 2
| 8D***20 | Emergency Brake Control Group | 1 |
8d2530 Emergency Brake Control Group--Part 2 Of 3--Type 1
| 8D***30 | Emergency Brake Control Group | 1 |
8d620 Emergency Brake Control Group--Part 3 Of 3--Type 2
| 8D***20 | Emergency Brake Control Group | 1 |
8d2530 Emergency Brake Control Group--Part 3 Of 3--Type 1
| 8D***30 | Emergency Brake Control Group | 1 |
8d2530 Emergency Brake Control Group--Part 1 Of 3--Type 1
| 8D***30 | Emergency Brake Control Group | 1 |
8d620 Emergency Brake Control Group--Top View--Part 2 Of 3--Type 1
| 8D***20 | Emergency Brake Control Group | 1 |
8d2530 Emergency Brake Control Group--Part 2 Of 3--Type 2
| 8D***30 | Emergency Brake Control Group | 1 |
8d620 Emergency Brake Control Group--As Viewed From Left Hand Side Of Machine--Part 1 Of 3--Type 1
| 8D***20 | Emergency Brake Control Group | 1 |
8d620 Emergency Brake Control Group--Part 1 Of 3--Type 2
| 8D***20 | Emergency Brake Control Group | 1 |
8d2530 Emergency Brake Control Group--Part 3 Of 3--Type 2
| 8D***30 | Emergency Brake Control Group | 1 |
8d2530 Emergency Brake Control Group--Part 1 Of 3--Type 2
| 8D***30 | Emergency Brake Control Group | 1 |
8d620 Emergency Brake Control--Part 3 Of 3--Type 1
| 8D***20 | Emergency Brake Control Group | 1 |
8d2110 Emergency Steering Control Group--Part 2 Of 2--Type 2
| 8D***10 | Emergency Steering Control Group | 1 |
7d7480 Emergency Steering Control Group--Part 1 Of 2
| 7D***80 | Emergency Steering Control Group | 1 |
8d2110 Emergency Steering Control Group--Part 2 Of 2--Type 1
| 8D***10 | Emergency Steering Control Group | 1 |
7d7480 Emergency Steering Control Group--Part 2 Of 2
| 7D***80 | Emergency Steering Control Group | 1 |
8d2110 Emergency Steering Control Group--Part 1 Of 2--Type 1
| 8D***10 | Emergency Steering Control Group | 1 |
8d2110 Emergency Steering Control Group--Part 1 Of 2--Type 2
| 8D***10 | Emergency Steering Control Group | 1 |
9m2190 Planetary Final Drive Group--Type 2
| 9M***90 | Final Drive Group; Planetary Final Drive Group | 1 |
9m2190 Planetary Final Drive Group--Type 1
| 9M***90 | Final Drive Group; Planetary Final Drive Group | 1 |
Front Axle And Wheels (6d1460 N/S)--Type 2
| 6D***60 | Front Axle And Wheels | 1 |
Front Axle And Wheels (6d1460 N/S)--Type 1
| 6D***60 | Front Axle And Wheels | 1 |
8d510 Front Brake Arrangement--Factory Installation
| 7M***52 | Brake Group-Front; Front Brake Group | 2 |
| 8D***00 | Brake Control Group | 1 |
| 8D***10 | Front Brake Arrangement | 1 |
8d3490 Fuel Tank Adapter Group--Fast Fill
| 8D***90 | Fuel Tank Adapter Group | 1 |
8d3480 Fuel Tank Adapter Group--Fast Fill--Type 4
| 8D***80 | Fuel Tank Adapter Group | 1 |
8d3480 Fuel Tank Adapter Group--Fast Fill--Type 1
| 8D***80 | Fuel Tank Adapter Group | 1 |
8d3480 Fuel Tank Adapter Group--Fast Fill--Type 2
| 8D***80 | Fuel Tank Adapter Group | 1 |
8d3480 Fuel Tank Adapter Group--Fast Fill--Type 3
| 8D***80 | Fuel Tank Adapter Group | 1 |
8f9866 Grease Gun
| 8F***66 | Grease Gun As | 1 |
8d3300 High Speed Oil Change Group
| 8D***00 | High Speed Oil Change Group | 1 |
9m4802 Hot Water Heater Assembly
| 9M***02 | Hot Water Heater Assembly | 1 |
8d9055 Hour Meter Group--Type 1
| 8D***55 | Hour Meter Group | 1 |
8d9055 Hour Meter Group--Type 2
| 8D***55 | Hour Meter Group | 1 |
2p2429 Jacket Water Heater Group
| 2P***29 | Jacket Water Heater Group | 1 |
2p6133 Jacket Water Heater Group--Type 2
| 2P***33 | Jacket Water Heater Group | 1 |
2p6133 Jacket Water Heater Group--Type 1
| 2P***33 | Jacket Water Heater Group | 1 |
7n8292 Fuse Holder, Fuse And Wire Kit--Field Installation
| 7N***92 | Kit-Fuse Holder | 1 |
1m1882 Flood Lamp Assembly--24 Volt
| 1M***82 | Lamp Group | 1 |
8d3220 Rear View Mirror Group
| 8D***20 | Mirror Group | 1 |
Name Plates And Transfers
| 1P***28 | Transfer Group | 1 |
| 1P***76 | Film-Cat On Side Of Operator Compartment | 1 |
| 1S***34 | Plate; Shifting On Power Shift Console | 1 |
9d9160 Oil Cooler Lines Group
| 9D***60 | Oil Cooler Lines Group | 1 |
8d875 Passenger Seat Group
| 8D***75 | Passenger Seat Group | 1 |
7m5383 Passenger Seat Group--Right Hand
| 7M***83 | Passenger Seat Group--R.H. | 1 |
2g2390 Platform Arrangement
| 2G***80 | Front Fender Group | 1 |
| 2G***90 | Platform Arrangement | 1 |
| 8D***10 | Rear Fender Group | 1 |
8d600 Platform Group
| 8D***00 | Platform Group | 1 |
5d1920 Protection Cover Group--Fuel Tank Cap
| 5D***20 | Protection Cover Group-Fuel Tank Cap; Protection Cover Group | 1 |
8d200 Rear Vision Mirror Group--R.H.--Fender Mounted
| 8D***00 | Rear View Mirror Group | 1 |
5d6430 Rear Wheel And Brake Group--Part 2 Of 2--Type 2
| 5D***30 | Rear Wheels And Brakes | 1 |
5d6430 Rear Wheel And Brake Group--Part 1 Of 2--Type 2
| 5D***30 | Rear Wheels And Brakes | 1 |
5d6430 Rear Wheel And Brake Group--Part 2 Of 2--Type 1
| 5D***30 | Rear Wheels And Brakes | 1 |
5d6430 Rear Wheel And Brake Group--Part 1 Of 2--Type 1
| 5D***30 | Rear Wheels And Brakes | 1 |
8d2130 Recording Tachograph Group
| 8D***30 | Recording Tachograph Group | 1 |
7d6750 Recording Tachograph Group--24 Volt--Top View
| 7D***50 | Recording Tachograph Group | 1 |
6n1644 Refrigerant Compressor Arrangement
| 6N***43 | Refrigerant Compressor Group | 1 |
| 6N***44 | Refrigerant Compressor Arrangement | 1 |
| 9D***60 | Oil Cooler Lines Group | 1 |
6n1643 Refrigerant Compressor Group--Type 2
| 6N***43 | Refrigerant Compressor Group | 1 |
6n1643 Refrigerant Compressor Group--Type 1
| 6N***43 | Refrigerant Compressor Group | 1 |
9m4509 Rotochamber
| 9M***09 | Rotochamber | 1 |
8d9730 Seat Group
| 8D***30 | Seat Group | 1 |
9s7978 Tool Group
| 9S***78 | Tool Group-Hand | 1 |
8d5410 Transmission Control Lock Group-Type 1
| 8D***10 | Transmission Control Lock Group | 1 |
8d5410 Transmission Control Lock Group--Type 2
| 8D***10 | Transmission Control Lock Group | 1 |
6d1039 Valve Assembly
| 6D***39 | Valve As; -Exhaust Bypass-Exhaust Diverter | 1 |
2g9000 Fast Fill Adapter Group
| 2G***00 | Valve As-Tank | 1 |
8d653 Wheel Arrangement--Factory Installation
| 8D***53 | Wheel Arrangement | 1 |
| 9M***90 | Final Drive Group; Planetary Final Drive Group | 1 |
8d590 Windrow Breaker Group
| 8D***90 | Windrow Breaker Group | 1 |
6s5175 Windshield Washer Group
| 6S***75 | Windshield Washer Group | 1 |
Diesel Engine
9m4825 Aftercooler Group
| 9M***25 | Aftercooler Group; Aftercooler Group | 1 |
Air Cleaner (8m3871 N/S)
| 8M***71 | Air Cleaner | 1 |
1p5010 Air Compressor Assembly
| 1P***10 | Air Compressor Assembly | 1 |
6n6852 Air Compressor Group
| 6N***52 | Air Compressor Group | 1 |
9d1329 Alarm Group
| 9D***29 | Alarm Group; (24 Volt) | 1 |
9s3185 Alternator Group--24 Volt, 50 Ampere
| 9S***85 | Alternator Group-Charging | 1 |
5s9088 Alternator Assembly--24 Volt, 50 Ampere--Part 2 Of 2
| 5S***88 | Alternator Group-Charging | 1 |
5s9088 Alternator Assembly--24 Volt, 50 Ampere--Part 1 Of 2
| 5S***88 | Alternator Group-Charging | 1 |
7d9375 Basic Alarm Group--24 Volt
| 7D***75 | Basic Alarm Group | 1 |
Batteries, Cables, Lamps, Switches And Harness--Part 1 Of 2
Batteries, Cables, Lamps, Switches And Harness--Part 2 Of 2
Brake Oil Cooler And Water Lines (8s3764 N/S)
| 8S***64 | Brake Oil Cooler And Water Lines | 1 |
2p3171 Breather Group
| 2P***71 | Breather Group; Breather Group | 1 |
Breather (9s1948 N/S)
| 9S***48 | Breather Group | 1 |
2p447 Exhaust By-Pass Group
| 2P***47 | Bypass Group-Exhaust; Exhaust By-Pass Group | 1 |
2p3232 Camshaft Cover Group
| 2P***32 | Camshaft Cover Group | 1 |
7s3586 Camshaft Drive Group
| 7S***86 | Camshaft Drive Group | 1 |
9s737 Camshaft Group
| 9S***37 | Camshaft Group; Camshaft Group | 1 |
8m9681 Air Compressor Group
| 8M***81 | Compressor Group; Air Compressor Group | 1 |
8s813 Connecting Rod And Piston Group--6 Required
| 8S***13 | Connecting Rod And Piston; Connecting Rod And Piston Group | 1 |
2p8708 Fuel Ratio Control Group
| 2P***08 | Control Group-Fuel Ratio; Fuel Ratio Control Group | 1 |
6n3183 Torque Spring Group
| 6N***83 | Control Group-Torque; Torque Control Group | 1 |
6n7637 Engine Oil Cooler Group
| 6N***37 | Cooler Group-Engine Oil; Engine Oil Cooler Group | 1 |
9m3677 Engine Oil Cooler Group--As Viewed From Right Hand Side Of Engine
| 9M***77 | Cooler Group-Oil | 1 |
8s3747 Protection Cover Group--Oil Filler Cap
| 8S***47 | Cover Group-Protection; Protection Cover Group-- Oil Filler Cap | 1 |
7s3598 Cylinder Block And Covers Group--End View-Part 2 Of 2
| 7S***98 | Covers & Block Group; Cylinder Block And Covers Group | 1 |
Cylinder Block And Covers (7s3598 N/S)--End View-Part 2 Of 2
| 7S***98 | Covers & Block Group; Cylinder Block And Covers Group | 1 |
7s3598 Cylinder Block And Covers Group--Side View--Part 1 Of 2
| 7S***98 | Covers & Block Group; Cylinder Block And Covers Group | 1 |
Cylinder Block And Covers (7s3598 N/S)--Side View-Part 1 Of 2
| 7S***98 | Covers & Block Group; Cylinder Block And Covers Group | 1 |
Crankshaft Bearing Replacements
1p4430 Crankshaft Group
| 1P***30 | Crankshaft Group; Crankshaft Group | 1 |
Crankshaft (1p4430 N/S)
| 1P***30 | Crankshaft Group; Crankshaft Group | 1 |
7s3601 Cylinder Block Assembly
| 7S***01 | Cylinder Block | 1 |
9s733 Cylinder Head And Valve Mechanism Group--Side View-Part 1 Of 2
| 9S***33 | Cylinder Head & Valve Group; Cylinder Head And Valve Mechanism Group | 1 |
9s733 Cylinder Head And Valve Mechanism Group--End View-Part 2 Of 2
| 9S***33 | Cylinder Head & Valve Group; Cylinder Head And Valve Mechanism Group | 1 |
Cylinder Head And Valve Mechanism (9s733 N/S)--End View-Part 2 Of 2
| 9S***33 | Cylinder Head & Valve Group; Cylinder Head And Valve Mechanism Group | 1 |
Cylinder Head And Valve Mechanism (9s733 N/S)--Side View-Part 1 Of 2
| 9S***33 | Cylinder Head & Valve Group; Cylinder Head And Valve Mechanism Group | 1 |
4s5472 Drive Pulley And Damper Group
| 4S***72 | Damper & Pulley Group; Drive Pulley And Damper Group | 1 |
8d1448 Dash Panel Assembly--24 Volt--Part 1 Of 2
| 8D***48 | Dash Panel Assembly | 1 |
7d4974 Dash Panel Assembly--24 Volt--Part 1 Of 2
| 7D***74 | Dash Panel Assembly | 1 |
8d1448 Dash Panel Assembly--24 Volt--Part 2 Of 2
| 8D***48 | Dash Panel Assembly | 1 |
9d1412 Dash Panel Assembly--Part 2 Of 2
| 9D***12 | Dash Panel Assembly | 1 |
9d1412 Dash Panel Assembly--Part 1 Of 2
| 9D***12 | Dash Panel Assembly | 1 |
7d4974 Dash Panel Assembly--24 Volt--Part 2 Of 2
| 7D***74 | Dash Panel Assembly | 1 |
Dash Panel, Switches, Lamps And Harness--Part 1 Of 2
Dash Panel, Switches, Lamps And Harness--Part 2 Of 2
9s701 Air Compressor Drive Group
| 9S***01 | Drive Group; Air Compressor Drive Group | 1 |
8s5414 Accessory Drive Group
| 8S***14 | Drive Group-Accessory; Accessory Drive Group | 1 |
Accessory Drive (8s5414 N/S)
| 8S***14 | Drive Group-Accessory; Accessory Drive Group | 1 |
2p1460 Camshaft Drive Group
| 2P***60 | Drive Group-Camshaft; Camshaft Drive Group | 1 |
2s7358 Fan Drive Group
| 2S***58 | Drive Group-Fan; Fan Drive Group | 1 |
7d6500 Electrical System--24 Volt--As Viewed From Right Hand Side Of Machine
| 7D***00 | Electrical System | 1 |
8s9995 Basic Engine Arrangement
| 1M***37 | Pump Group-Oil; Oil Pump Group | 1 |
| 1M***39 | Starter Group-Electric; Electric Starter Group | 1 |
| 1P***30 | Crankshaft Group; Crankshaft Group | 1 |
Exhaust Extension (8d560 N/S)
| 8D***60 | Exhaust Extension | 1 |
9m3223 Oil Filter Group
| 9M***23 | Filter Group-Engine Oil; Oil Filter Group | 1 |
9s9749 Fuel Filter Group
| 9S***49 | Filter Group-Fuel; Fuel Filter Group | 1 |
4s6813 Flywheel Group
| 4S***13 | Flywheel Group; Flywheel Group | 1 |
1p2297 Fuel Priming Pump Assembly (8s7705 N/S)
| 1P***97 | Fuel Priming Pump Assembly | 1 |
6n9740 Fuel Priming Pump Barrel Assembly
| 6N***40 | Fuel Priming Pump Barrel Assembly | 1 |
8s5174 Fuel Pump Housing Group--Type 2
| 8S***74 | Fuel Pump Housing Group | 1 |
8s5174 Fuel Pump Housing Group
| 8S***74 | Fuel Pump Housing Group | 1 |
8s5174 Fuel Pump Housing Group--Type 1
| 8S***74 | Fuel Pump Housing Group | 1 |
8s5095 Fuel Ratio Control Group
| 8S***95 | Fuel Ratio Control Group | 1 |
8m3873 Fuel System Group--135 U.S. Gallon
| 8M***73 | Fuel System | 1 |
7s5445 Fuel Transfer Pump Group (7s5108 N/S)
| 7S***45 | Fuel Transfer Pump Group | 1 |
4n4873 Fuel Transfer Pump Group (7s5108 N/S)
| 4N***73 | Fuel Transfer Pump Group | 1 |
Gasket Kits
| 2P***00 | Complete Engine Overhaul | 0 |
| 2P***01 | Valve Grinding | 0 |
| 2P***02 | Transmission Overhaul | 0 |
7s4280 Glow Plug And Wiring Group--24 Volt
| 7S***80 | Glow Plug And Wiring Group | 1 |
9s5002 Governor Control Lever Service Group
| 9S***02 | Governor Control Lever Service Group | 1 |
8s5175 Governor Group--Part 2 Of 2--Type 3--Field Installation
| 8S***75 | Governor Group | 1 |
2p8724 Governor Group--Part 1 Of 2
| 2P***24 | Governor Group | 1 |
8s5175 Governor Group--Part 1 Of 2--Type 2--Field Installation
| 8S***75 | Governor Group | 1 |
8s5175 Governor Group--Part 1 Of 2--Type 3--Field Installation
| 8S***75 | Governor Group | 1 |
2p8724 Governor Group--Part 2 Of 2
| 2P***24 | Governor Group | 1 |
8s5175 Governor Group--Part 1 Of 2--Type 1
| 8S***75 | Governor Group | 1 |
8s5175 Governor Group--Part 2 Of 2--Type 4--Field Installation
| 8S***75 | Governor Group | 1 |
8s5175 Governor Group--Part 2 Of 2-Type 1
| 8S***75 | Governor Group | 1 |
8s5175 Governor Group--Part 2 Of 2--Type 2--Field Installation
| 8S***75 | Governor Group | 1 |
8s5175 Governor Group--Part 1 Of 2--Type 4--Field Installation
| 8S***75 | Governor Group | 1 |
9d1398 Harness Assembly
| 9D***98 | Harness Assembly | 1 |
7m7147 Combination Stop And Tail Lamp Assembly
| 7M***47 | Lamp As-Stop & Tail | 1 |
5s5148 Head Lamp Group--24 Volt--Type 2
| 5S***48 | Lamp Group; (High Beam) | 1 |
5s5147 Head Lamp Group--24 Volt--Type 2
| 5S***47 | Lamp Group | 1 |
5s5147 Head Lamp Group--24 Volt--Type 1
| 5S***47 | Lamp Group | 1 |
5s5148 Head Lamp Group--24 Volt--Type 1
| 5S***48 | Lamp Group; (High Beam) | 1 |
8d545 Lighting And Wiring Group--24 Volt
| 8D***45 | Lighting And Wiring Group | 1 |
8d545 Lighting And Wiring Group--24 Volt--As Viewed From Rear Right Hand Side Of Machine
| 8D***45 | Lighting And Wiring Group | 1 |
7s3592 Oil Lines Group--As Viewed From Rear Of Engine
| 7S***92 | Lines Group-Oil; Oil Lines Group | 1 |
7s3592 Oil Lines Group
| 7S***92 | Lines Group-Oil; Oil Lines Group | 1 |
7s3585 Manifold Group--As Viewed From Rear Of Engine-Part 2 Of 2
| 7S***85 | Manifold Group; Manifold Group | 1 |
7s3585 Manifold Group--As Viewed From Right Hand Side Of Engine-Part 1 Of 2
| 7S***85 | Manifold Group; Manifold Group | 1 |
9s3672 Service Meter Group
| 9S***72 | Meter Group-Service; Service Meter Group | 1 |
9s689 Fuel Injection Valves And Lines Group
| 9S***89 | Miscellaneous Group-Fuel Inj; Fuel Injection Valves And Lines Group | 1 |
Fuel Injection Valves And Lines (9s689 N/S)
| 9S***89 | Miscellaneous Group-Fuel Inj; Fuel Injection Valves And Lines Group | 1 |
2m1464 Starting Motor Assembly--24 Volt--Part 1 Of 2
| 2M***64 | Motor Assembly | 1 |
2m1464 Starting Motor Assembly--24 Volt--Part 2 Of 2
| 2M***64 | Motor Assembly | 1 |
4n6420 Muffler Group
| 4N***20 | Muffler Group | 1 |
2p2849 Oil Cooler Adapter Group
| 2P***49 | Oil Cooler Adapter Group | 1 |
1s8008 Oil Drain Extension Group
| 1S***08 | Oil Drain Extension | 1 |
Oil Drain Extension (1s8008 N/S)
| 1S***08 | Oil Drain Extension | 1 |
9m3202 Oil Filter Base Assembly
| 9M***02 | Oil Filter Base Assembly | 1 |
9s1195 Oil Pump Assembly
| 9S***95 | Oil Pump Assembly | 1 |
6n8298 Oil Pump Assembly
| 6N***98 | Oil Pump Group | 1 |
6n2994 Glow Plug Group--24 Volt
| 6N***94 | Plug Group-Glow; Glow Plug Group | 1 |
8s7608 Primary Fuel Filter Group
| 8S***08 | Primary Fuel Filter Group | 1 |
Fuel Pump Housing And Governor (8s5176 N/S)
| 8S***76 | Pump & Governor Group; Fuel Pump Housing And Governor Group | 1 |
8s5176 Fuel Pump Housing And Governor Group
| 8S***76 | Pump & Governor Group; Fuel Pump Housing And Governor Group | 1 |
8s7705 Fuel Priming Pump Group
| 8S***05 | Pump Group-Fuel Priming; Fuel Priming Pump Group | 1 |
1m7037 Oil Pump Group
| 1M***37 | Pump Group-Oil; Oil Pump Group | 1 |
Radiator (2s8824 N/S)--As Viewed From Rear Of Engine-Part 1 Of 2
| 2S***24 | Radiator | 1 |
Radiator (2s8824 N/S)-Part 2 Of 2
| 2S***24 | Radiator | 1 |
1p666 Regulator Assembly
| 1P***66 | Regulator Group | 1 |
7n4543 Service Horn Group
| 4S***88 | Terminal; (Blade-Crimp Type)(Male) | 1 |
| 5P***71 | Terminal (To Flasher Unit & Turn Signal Switch) | 1 |
| 7N***43 | Service Horn Group | 1 |
9s5733 Service Meter Drive Group (9s3516 N/S)
| 9S***33 | Service Meter Drive Group | 1 |
7m6320 Speedometer And Tachometer Drive Group
| 7M***20 | Speedometer And Tachometer Drive | 1 |
4n4265 Governor Torque Spring Group
| 4N***65 | Spring Group-Governor Torque | 1 |
1m7039 Electric Starter Group--24 Volt
| 1M***39 | Starter Group-Electric; Electric Starter Group | 1 |
4n3273 Starting Motor Group--Part 2 Of 2
| 4N***73 | Starting Motor Group | 1 |
4n3273 Starting Motor Group--Part 1 Of 2
| 4N***73 | Starting Motor Group | 1 |
2s8825 Suction Fan Group
| 2S***25 | Suction Fan | 1 |
Suction Fan (2p1241 N/S)
| 2P***41 | Suction Fan | 1 |
7m2673 Engine Support Group
| 7M***73 | Support Group-Engine; Engine Support Group | 1 |
7n718 Disconnect Switch Assembly
| 7N***18 | Switch As-Disconnect; -Battery-Ground Level | 1 |
7h7290 Disconnect Switch Assembly--24 Volt--
| 7H***90 | Switch As-Disconnect | 1 |
4m1812 Solenoid Switch Assembly
| 4M***12 | Switch As-Solenoid | 1 |
6n5123 Solenoid Switch Assembly
| 6N***23 | Switch As-Solenoid | 1 |
4n3900 Coolant Flow Switch Group
| 4N***00 | Switch Group-Coolant Flow; Coolant Flow Switch Group | 1 |
Tail Lamps, Switches And Harness
Throttle Control (8m3884 N/S)--Part 2 Of 2
| 8M***84 | Throttle Control | 1 |
Throttle Control (8m3884 N/S)--Part 1 Of 2
| 8M***84 | Throttle Control | 1 |
Throttle Control (8m3884 N/S)--As Viewed From Front Of Machine--Part 2 Of 2
| 8M***84 | Throttle Control | 1 |
Throttle Control (8m3884 N/S)--As Viewed From Right Hand Side Of Machine--Part 1 Of 2
| 8M***84 | Throttle Control | 1 |
Torque Spring (9s9004 N/S)
| 9S***04 | Torque Spring | 1 |
8s6472 Turbocharger Assembly (7m4892 N/S)
| 8S***72 | Turbocharger Assembly | 1 |
4n5640 Turbocharger Group (7m4892 N/S)
| 4N***40 | Turbocharger Group; Turbocharger Group | 1 |
4n4788 Variable Timing Drive Assembly
| 4N***88 | Variable Timing Drive Assembly | 1 |
8s5115 Variable Timing Drive Assembly
| 8S***15 | Variable Timing Drive Assembly | 1 |
2s7209 Water Pump Assembly (2s8822 N/S)
| 2S***09 | Water Pump Assembly | 1 |
7d6393 Wiring Harness Assembly
| 7D***93 | Wiring Harness Assembly | 1 |
Transmission And Chassis
7m6552 Front Brake Group--2 Required
| 7M***52 | Brake Group-Front; Front Brake Group | 1 |
9j1287 Cylinder Group (Change 0)--3.75" Bore X 14.75" Stroke
| 9J***87 | Cylinder Group-Steering | 1 |
Planetary Final Drive (6d1520 N/S)
| 6D***20 | Final Drive Group; Planetary Final Drive Group | 1 |
6g290 Slip Joint Group
| 6G***90 | Slip Joint Group | 1 |
3g688 Rear Suspension Group--2 Required
| 3G***88 | Suspension Group-Rear | 1 |
7m8392 Accumulator Body Group
| 7M***92 | Accumulator Body Group | 1 |
9d478 Air Control Valve Group
| 9D***78 | Air Control Valve Group | 1 |
8d505 Air Horn Group
| 8D***05 | Air Horn Group | 1 |
Air Horn (8d505 N/S)
| 8D***05 | Air Horn Group | 1 |
9d1930 Air Lines Group--Part 1 Of 5
| 9D***30 | Air Lines Group | 1 |
9d1930 Air Lines Group--Part 2 Of 5
| 9D***30 | Air Lines Group | 1 |
9d1930 Air Lines Group--Part 3 Of 5
| 9D***30 | Air Lines Group | 1 |
9d1930 Air Lines Group--Part 4 Of 5
| 9D***30 | Air Lines Group | 1 |
9d1930 Air Lines Group--Part 5 Of 5
| 9D***30 | Air Lines Group | 1 |
Air Tanks, Valves And Lines--Part 2 Of 2
Air Tanks, Valves And Lines--Part 1 Of 2
8m3890 Brake And Retarder Cooling Lines Group--Part 1 Of 3
| 8M***90 | Brake And Retarder Cooling Lines | 1 |
Brake And Retarder Cooling Lines (8m3890 N/S)--Part 1 Of 2
| 8M***90 | Brake And Retarder Cooling Lines | 1 |
8m3890 Brake And Retarder Cooling Lines Group--Part 3 Of 3
| 8M***90 | Brake And Retarder Cooling Lines | 1 |
Brake And Retarder Cooling Lines (8m3890 N/S)--Part 2 Of 2
| 8M***90 | Brake And Retarder Cooling Lines | 1 |
8m3890 Brake And Retarder Cooling Lines Group--Part 2 Of 3
| 8M***90 | Brake And Retarder Cooling Lines | 1 |
Brake Control (8d550 N/S)--As Viewed From Front Left Hand Side Of Machine
| 8D***50 | Brake Control | 1 |
Brake Cylinder And Lines
8j3832 Brake Cylinder Group
| 8J***32 | Brake Cylinder Group | 1 |
8j6762 Brake Cylinder Group
| 8J***62 | Brake Cylinder Group | 1 |
9j1254 Brake Cylinder Group--2 Required
| 9J***54 | Brake Cylinder Group | 1 |
5d6420 Rear Brake Group
| 5D***20 | Brake Group-Service | 1 |
5d3640 Brake Valve Assembly
| 5D***40 | Brake Valve Assembly | 1 |
7d6009 Brake Valve Assembly
| 7D***09 | Brake Valve Assembly | 1 |
Brake Valve, Valves And Lines--Part 1 Of 2
Brake Valve, Valves And Lines--Part 2 Of 2
6d1560 Cab Group--As Viewed From Right Hand Side Of Machine--Part 3 Of 3
| 6D***60 | Cab Group | 1 |
9d1620 Cab Group--As Viewed From Right Hand Side Of Machine--Part 2 Of 2
| 9D***20 | Cab Group; Cab Group | 1 |
6d1560 Cab Group--Part 1 Of 3
| 6D***60 | Cab Group | 1 |
6d1560 Cab Group--As Viewed From Right Hand Side Of Machine--Part 2 Of 3
| 6D***60 | Cab Group | 1 |
6d1560 Cab Group--Part 2 Of 3
| 6D***60 | Cab Group | 1 |
9d1620 Cab Group--As Viewed From Left Hand Side Of Machine--Part 1 Of 2
| 9D***20 | Cab Group; Cab Group | 1 |
8d2135 Cab Heater Group--24 Volt
| 8D***35 | Cab Heater Group | 1 |
Cab Visor (9d1335 N/S)
| 9D***35 | Cab Visor | 1 |
3g2752 Cartridge Group--21 Gpm--Counterclockwise
| 3G***52 | Cartridge Group | 1 |
3g1267 Cartridge Group
| 3G***67 | Cartridge Group | 1 |
3g2236 Cartridge Group--24 Gpm
| 3G***36 | Cartridge Group | 1 |
9d341 Check Valve Group
| 9D***41 | Check Valve Group | 1 |
9d339 Check Valve Group
| 9D***39 | Check Valve Group | 1 |
5d8047 Control Valve Assembly
| 5D***47 | Control Valve Assembly | 1 |
6j8899 Control Valve Group
| 6J***99 | Control Valve Group | 1 |
7j9035 Control Valve Group
| 7J***35 | Control Valve Group | 1 |
Cowling (9m1958 N/S)
| 9M***58 | Cowling | 1 |
Cowling (9m1958 N/S)--As Viewed From Front Of Machine
| 9M***58 | Cowling | 1 |
7j7528 Steering Cylinder Group--3.75" Bore X 14.80" Stroke
| 7J***28 | Cylinder Group | 1 |
6d1510 Differential And Bevel Gear Group
| 6D***10 | Differential And Bevel Gear Group | 1 |
8d2350 Door Group--Left Hand
| 8D***50 | Door Group | 1 |
8d1440 Door Group--Right Hand
| 8D***40 | Door Group | 1 |
6d1550 Door Group--Left Hand
| 6D***50 | Door Group | 1 |
5d7930 Door Group--Right Hand
| 5D***30 | Door Group | 1 |
9m7784 Double Universal Joint Assembly--Type 2
| 9M***84 | Double Universal Joint Assembly | 1 |
9m7784 Double Universal Joint Assembly--Type 1
| 9M***84 | Double Universal Joint Assembly | 1 |
8d2016 Double Universal Joint Assembly
| 8D***16 | Double Universal Joint Assembly | 1 |
9s4092 Torque Converter Oil Pump Drive Group
| 9S***92 | Drive Group-Pump; Torque Converter Oil Pump Drive Group | 1 |
9m2193 Drive Shaft Group
| 9M***93 | Drive Shaft | 1 |
7j5618 Transmission Filter Group
| 7J***18 | Filter Group-Oil | 1 |
8j276 Flow Control Valve Group
| 8J***76 | Flow Control Valve Group | 1 |
8d540 Frame Group--Part 2 Of 2
Frame (8d540 N/S)
8d540 Frame Group--Part 1 Of 2
Front Axle And Wheels (6d300 N/S)--18.00 X 33 Tubeless Tires
| 6D***00 | Front Axle And Wheel | 1 |
Front Brake Control (9d1820 N/S)--Part 2 Of 2
| 9D***20 | Front Brake Control | 1 |
Front Brake Control (9d1820 N/S)--Part 1 Of 2
| 9D***20 | Front Brake Control | 1 |
2g2380 Front Fender Group
| 2G***80 | Front Fender Group | 1 |
2g1930 Front Fender Group
| 2G***30 | Front Fender Group | 1 |
2p1077 Gear Pump Group
| 2P***77 | Gear Pump Group | 1 |
9m5616 Hydraulic Pump Group--Hoist
| 9M***16 | Gear Pump Group | 1 |
6p824 Gear Pump Group
| 6P***24 | Gear Pump Group | 1 |
2s500 Governor Group
| 2S***00 | Governor Group | 1 |
2g4790 Heater Group
| 2G***90 | Heater Group | 1 |
8d555 Hitch Group
| 8D***55 | Hitch Group | 1 |
Hoist Control (8m3883 N/S)
| 8M***83 | Hoist Control | 1 |
Hood (8m3874 N/S)
8m3874 Hood Group
5d6998 Air Horn Assembly
| 5D***98 | Horn Group-Air | 1 |
7j8076 Hydraulic Oil Filter Group
| 7J***76 | Hydraulic Oil Filter Group | 1 |
7j611 Hydraulic Pump Assembly--Type 1
| 7J***11 | Hydraulic Pump Assembly | 1 |
7j611 Hydraulic Pump Assembly--Type 2
| 7J***11 | Hydraulic Pump Assembly | 1 |
7j603 Hydraulic Steering Pump Assembly--Type 1
| 7J***03 | Hydraulic Pump Assembly | 1 |
7j603 Hydraulic Steering Pump Assembly--Type 2
| 7J***03 | Hydraulic Pump Assembly | 1 |
7j611 Hydraulic Pump Assembly--Type 3
| 7J***11 | Hydraulic Pump Assembly | 1 |
9m1361 Hydraulic Pump Group
| 9M***61 | Hydraulic Pump Group | 1 |
7d7290 Hydraulic Steering Tank Group
| 7D***90 | Hydraulic Steering Tank Group | 1 |
Hydraulic Tank And Valve (5j6550 N/S)--Part 2 Of 2
| 5D***50 | Hydraulic Tank And Valve | 1 |
Hydraulic Tank And Valve (5d6550 N/S)--Part 1 Of 2
| 5D***50 | Hydraulic Tank And Valve | 1 |
8j2535 Hydraulic Tank And Valve Group--Part 1 Of 2--Type 2
| 8J***35 | Hydraulic Tank And Valve Group | 1 |
8j2535 Hydraulic Tank And Valve Group--Part 2 Of 2--Type 2
| 8J***35 | Hydraulic Tank And Valve Group | 1 |
8j2535 Hydraulic Tank And Valve Group--Part 2 Of 2--Type 1
| 8J***35 | Hydraulic Tank And Valve Group | 1 |
8j2535 Hydraulic Tank And Valve Group--Part 1 Of 2--Type 1
| 8J***35 | Hydraulic Tank And Valve Group | 1 |
Ladder (7d9360 N/S)
| 7D***60 | Ladder | 1 |
6d1670 Link Group
| 6D***70 | Link Group | 1 |
8s505 Lubrication Relief Valve Group
| 8S***05 | Lubrication Relief Valve Group | 1 |
6g4350 Windshield Wiper Motor Group--Sprague Ma-405-80
| 6G***50 | Motor Group-Wiper | 1 |
8s3333 Override Selector Valve Group
| 8S***33 | Override Selector Valve Group | 1 |
3k6559 Parking Brake Assembly
| 3K***59 | Parking Brake Assembly | 1 |
8m3885 Parking Brake Control Group
| 8M***85 | Parking Brake Control | 1 |
Planetary Transmission And Torque Converter (1p652 N/S)
| 1P***52 | Planetary Transmission And Torque Converter | 1 |
Planetary Transmission And Torque Converter (2p6953 N/S)
| 2P***53 | Planetary Transmission And Torque Converter | 1 |
2p6951 Planetary Transmission Group--Part 1 Of 2
| 2P***51 | Planetary Transmission Group | 1 |
2p6951 Planetary Transmission Group--Part 2 Of 2
| 2P***51 | Planetary Transmission Group | 1 |
9s4420 Planetary Transmission Group--Part 2 Of 2
| 9S***20 | Planetary Transmission Group | 1 |
9s4420 Planetary Transmission Group--Part 1 Of 2
| 9S***20 | Planetary Transmission Group | 1 |
Platform (8m3880 N/S)--Left Hand--Top View
| 8M***80 | Platform | 1 |
Platform (8d2025 N/S)--Left Hand--Top View
| 8D***25 | Platform | 1 |
8d2025 Platform Group--Front--Left Hand--Top View
| 8D***25 | Platform | 1 |
Platform (8m3879 N/S)--Right Hand--Top View
| 8M***79 | Platform | 1 |
8d2025 Platform Group--Left Hand--Top View
| 8D***25 | Platform | 1 |
9d590 Platform Group--Rear
| 9D***90 | Platform Group | 1 |
8d1920 Platform Group--Front--Right Hand--Top View
| 8D***20 | Platform Group | 1 |
8d1920 Platform Group--Right Hand--Top View
| 8D***20 | Platform Group | 1 |
9s4335 Pressure Control Group
| 9S***35 | Pressure Control Group | 1 |
3p5117 Pressure Control Valve Group
| 3P***17 | Pressure Control Valve Group | 1 |
2s4996 Pressure Control Group
| 2S***96 | Pressure Control Valve Group | 1 |
7m5826 Range Transmission Arrangement--As Viewed From Right Hand Side Of Machine--Part 1 Of 2
| 7M***26 | Range Transmission Arrangement | 1 |
7m5826 Range Transmission Arrangement--As Viewed From Rear Of Machine--Part 2 Of 2
| 7M***26 | Range Transmission Arrangement | 1 |
9m2191 Rear Axle Housing Group
| 9M***91 | Rear Axle Housing | 1 |
8d610 Rear Fender Group
| 8D***10 | Rear Fender Group | 1 |
Rear Hydraulic Lines (8d535 N/S)
| 8D***35 | Rear Hydraulic Lines | 1 |
6d480 Rear Wheel And Brake Group--18.00 X 33 Tubeless Tires--Part 2 Of 2
| 6D***80 | Rear Wheel And Brake Group | 1 |
6d480 Rear Wheel And Brake Group--18.00 X 33 Tubeless Tires--Part 1 Of 2
| 6D***80 | Rear Wheel And Brake Group | 1 |
6j3400 Relief Valve Group--Type 1
| 6J***00 | Relief Valve Group | 1 |
5j2875 Relief Valve Group--Brake Cooling
| 5J***75 | Relief Valve Group | 1 |
6j3400 Relief Valve Group--Type 2
| 6J***00 | Relief Valve Group | 1 |
9j1791 Rotochamber Group
| 9J***91 | Rotochamber Group | 1 |
8j6765 Rotochamber Group
| 8J***65 | Rotochamber Group | 1 |
8j3875 Rotochamber Group
| 8J***75 | Rotochamber Group | 1 |
Safety Tread (8d2935 N/S)
| 8D***35 | Safety Tread | 1 |
8m3878 Seat Group--Front View-Part 2 Of 2
8m3878 Seat Group--Side View-Part 1 Of 2
6d2916 Seat Assembly
| 6D***16 | Seat Assembly | 1 |
8d824 Seat Group
| 8D***24 | Seat Group | 1 |
8d870 Seat Group
| 8D***70 | Seat Group | 1 |
1p7548 Selector Body Group--Type 2
| 1P***48 | Selector Body Group | 1 |
1p7548 Selector Body Group--Type 1
| 1P***48 | Selector Body Group | 1 |
1p7549 Selector Valve Group
| 1P***49 | Selector Valve Group | 1 |
9m4351 Selector Valve Group
| 9M***51 | Selector Valve Group | 1 |
2g390 Slack Adjuster Group
| 2G***90 | Slack Adjuster Group | 1 |
2g4680 Slack Adjuster Group
| 2G***80 | Slack Adjuster Group | 1 |
2g495 Steel Cab And Platform Conversion Group--Part 2 Of 2--Field Installation
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 6 |
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 6 |
| 1B***30 | Nut-- Flame Arrestor Or Adapter To Pipe Assembly | 6 |
2g495 Steel Cab And Platform Conversion Group--Part 1 Of 2--Field Installation
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 3 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 4 |
Steering Gear And Mounting (9m2185 N/S)
| 9M***85 | Steering Gear And Mounting | 1 |
6d1642 Steering Gear Assembly
| 6D***42 | Steering Gear Assembly | 1 |
Steering Pump, Tank And Lines (8m3892 N/S)--Top View--Part 3 Of 3
| 8M***92 | Steering Lines | 1 |
8m3892 Steering Pump, Tank And Lines Group--Top View--Part 2 Of 3
| 8M***92 | Steering Lines | 1 |
8m3892 Steering Pump, Tank And Lines Group--Part 1 Of 3
| 8M***92 | Steering Lines | 1 |
8m3892 Steering Pump, Tank And Lines Group--Top View--Part 3 Of 3
| 8M***92 | Steering Lines | 1 |
Steering Pump, Tank And Lines (8m3892 N/S)--As Viewed From Left Hand Side Of Machine--Part 1 Of 3
| 8M***92 | Steering Lines | 1 |
Steering Pump, Tank And Lines (8m3892 N/S)--Top View--Part 2 Of 3
| 8M***92 | Steering Lines | 1 |
Steering Linkage (9m1959 N/S)
| 9M***59 | Steering Linkage | 1 |
7j8286 Front Suspension Group--2 Required
| 7J***86 | Suspension Group | 1 |
Hydraulic Tank And Valve (5j6550 N/S)--Part 1 Of 2
| 5J***50 | Tank And Valve | 1 |
8m1071 Three Speed Planetary Transmission Group--Type 1
| 8M***71 | Three Speed Planetary Torque Divider | 1 |
8m1071 Three Speed Planetary Transmission Group--Type 2
| 8M***71 | Three Speed Planetary Torque Divider | 1 |
3s118 Throttle Pressure And Converter Hold Valve Group
| 3S***18 | Throttle Pressure And Converter Hold Valve Group | 1 |
1t1055 Torque Converter Group
| 1T***55 | Torque Converter Group | 1 |
1t990 Torque Converter Group
| 1T***90 | Torque Converter Group | 1 |
9m6496 Torque Converter Oil Cooler Group
| 9M***96 | Torque Converter Oil Cooler | 1 |
1s6086 Torque Converter Oil Cooler Group
| 1S***86 | Torque Converter Oil Cooler | 1 |
2p6955 Torque Divider Arrangement
| 2P***55 | Torque Divider Arrangement | 1 |
1p653 Torque Divider Arrangement
| 1P***53 | Torque Divider Arrangement | 1 |
1p7550 Torque Divider Hydraulic Control Group
| 1P***50 | Torque Divider Hydraulic Control Group | 1 |
Transfer Gears (7m5832 N/S)
| 7M***32 | Transfer Gears | 1 |
Transmission Control (8m3882 N/S)--As Viewed From Left Hand Side Of Machine--Part 1 Of 2
| 8M***82 | Transmission Control | 1 |
8m3882 Transmission Control Group--As Viewed From L.H. Side Of Machine-Part 2 Of 2
| 8M***82 | Transmission Control | 1 |
8m3882 Transmission Control Group--As Viewed From Rear Of Machine-Part 2 Of 2
| 8M***82 | Transmission Control | 1 |
8m3882 Transmission Control Group--As Viewed From Left Hand Side Of Machine-Part 1 Of 2
| 8M***82 | Transmission Control | 1 |
Transmission Control (8m3882 N/S)--As Viewed From Rear Of Machine-Part 2 Of 2
| 8M***82 | Transmission Control | 1 |
6d1380 Transmission Control Linkage Guard Group
| 6D***80 | Transmission Control Linkage Guard | 1 |
Transmission Hydraulic Control (8m6337 N/S)--Top View-Part 1 Of 2
| 8M***37 | Transmission Hydraulic Control | 1 |
Transmission Hydraulic Control (8m6337 N/S)--End View-Part 2 Of 2
| 8M***37 | Transmission Hydraulic Control | 1 |
Transmission Pump And Lines (8m3893 N/S)--Part 3 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
8m3893 Transmission Pump And Lines Group--Part 2 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
Transmission Pump And Lines (8m3893 N/S)--Part 4 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
Transmission Pump And Lines (8m3893 N/S)--Part 2 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
8m3893 Transmission Pump And Lines Group--Part 1 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
8m3893 Transmission Pump And Lines Group--Part 3 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
8m3893 Transmission Pump And Lines Group--Part 4 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
Transmission Pump And Lines (8m3893 N/S)--Part 1 Of 4
| 8M***93 | Transmission Pump And Lines | 1 |
4h8461 Universal Joint Assembly
| 4H***61 | Universal Joint Assembly | 1 |
4d2287 Valve Assembly
| 4D***87 | Valve As; -Parking, Service | 1 |
7d8075 Valve Assembly
| 7D***75 | Valve As | 1 |
4d487 Check Valve Assembly
| 4D***87 | Valve As-Check; -Air Supply-Primary Air Tank-Service Brake Control | 1 |
5d3056 Double Check Valve Assembly
| 5D***56 | Valve As-Double Check; -Brakesaver Air Supply | 1 |
3d9943 Horn Valve Assembly
| 3D***43 | Valve As-Horn | 1 |
1s3998 Retarder Valve Assembly
| 1S***98 | Valve As-Retarder; -Operator Control | 1 |
9d338 Check Valve Group
| 9D***38 | Valve Group; -Air Pressure Brake | 1 |
4d3278 Control Valve Assembly
| 4D***78 | Valve Group-Air Control; -Parking Brake Switch | 1 |
6d3781 Double Check Valve Group--Type 2
| 6D***81 | Valve Group-Check; -Service Brake Diverter-Retarder Control | 1 |
6d3781 Double Check Valve Group--Type 1
| 6D***81 | Valve Group-Check; -Service Brake Diverter-Retarder Control | 1 |
2p2859 Oil Cooler Inlet Valve Group
| 2P***59 | Valve Group-Cooler Inlet; -Transmission Oil Cooler Inlet | 1 |
8j2380 Relief Valve Group
| 8J***80 | Valve Group-Relief; -Rear Brake | 1 |
8d2647 Window Group
| 8D***47 | Window Group | 1 |
9d2520 Window Group--Left Hand
| 9D***20 | Window Group-Lh | 1 |
9d2530 Window Group--Right Hand
| 9D***30 | Window Group-Rh | 1 |
Window Guard (8d4100 N/S)
| 8D***00 | Window Guard | 1 |
Window Guard (9d1285 N/S)
| 9D***85 | Window Guard Group | 1 |
Windshield Washer (9d1375 N/S)
| 9D***75 | Windshield Washer | 1 |
Windshield Wiper (7m5390 N/S)
| 7M***90 | Windshield Wiper | 1 |
768B serial number reference
The PIN/serial plate on a 768B tractor is riveted to the frame, typically on the left front frame rail below the cab or on the firewall panel; check both spots since exact placement varies by build year. Pre-2000 Cat serials read as a 3-character prefix (two digits plus a letter, e.g. 79S) followed by a sequence number that starts the unit count; the prefix identifies the model and plant, the sequence number tells build order within that run. Always confirm plate location and full number with your dealer before ordering parts.
| Prefix | Identifies | Notes |
|---|---|---|
| 79S | 768B Tractor, full production run | Only PIN prefix documented for the 768B, running 79S1-up. A parts break lands around 79S77-80 for a steering linkage group; this is a mid-run parts change, not a separate serial-prefix generation. Built as a bare tractor unit for towing bottom-dump/coal trailers (trailers supplied by an outside trailer builder), not a rigid dump body. Fitted with the D343TA turbocharged-aftercooled diesel rated near 415 hp (309 kW), paired to a PowerShift transmission with disc brakes and pneumatic suspension. Produced roughly 1971 to 1978, alongside the related 769B rear-dump rock truck, which used the same engine family but is a separate rigid-body machine — do not blend its data into the 768B tractor. |
Frequently asked questions
What engine powers the Caterpillar 768B?
A Caterpillar D343T/D343TA turbocharged six-cylinder diesel rated at about 309 kW (415 hp) gross. It is the same engine and powershift driveline used in the rigid-dump 769B, since the 768B is built on that chassis as a fifth-wheel tractor rather than a dump truck.
What is the operating weight of the Caterpillar 768B?
The tractor alone weighs roughly 21.9-22 t (48,000-48,500 lb) unloaded, varying by configuration and serial range. That figure covers the tractor unit only - it does not include the separate Athey-built bottom-dump wagon it tows, which adds its own weight and payload capacity.
What replaced the Caterpillar 768B?
Nothing directly. Caterpillar built the 768B from 1971 to 1978 alongside the 769B, and when the 769B gave way to the redesigned 769C in 1978, Caterpillar moved to rigid dump trucks rather than continuing the fifth-wheel, wagon-towing tractor format. Bottom-dump wagon tractors like the 768B fell out of Caterpillar's mainstream lineup, so there is no true successor model - check with a dealer for a modern equivalent to this duty cycle.
What 768B owners discuss
What engine does the 768B actually run, and how does it like to be operated?
Straight-six Cat D343TA, turbocharged, about 14.6 L (893 cu in) displacement, mechanically governed with no electronics anywhere in the fuel or control system. On 768B/769B-era serial ranges the rating commonly quoted is about 310 kW (415 hp) gross; earlier pre-B trucks in the same engine family ran closer to 280-300 kW (375-400 hp), so match any horsepower figure to the actual serial range, not just the model name - varies by configuration/series. It's a pre-combustion-chamber design. Mechanics say these engines don't like being run light or slow for long periods to save fuel; that just lets them oil up and carbon the injectors and rings instead of burning clean. Warm it briefly, then load it. If it smokes cold, work it under load rather than idling it out. Gradual power loss or rough running on one of these is usually injector or pump timing drift, not anything electronic.
What's the transmission and driveline like, and what tends to wear or act up?
The 768B shares its powertrain and chassis with the 769B rigid truck: a torque converter feeding a 3-range planetary powershift, roughly nine forward speeds and one reverse across the ranges, fully hydraulic/mechanical control with no electronic shift logic. Reported issues match Cat's mechanical powershift family generally: a false-neutral feel traced to worn shift linkage or tired O-rings in the transmission control valve rather than the clutch packs themselves, and a gradual softening of shift quality as clutch discs wear. The converter and transmission share one oil sump, so low or contaminated fluid shows up as mushy converter response and sloppy shifting at the same time. Check fluid condition and level first before assuming a clutch pack problem.
There's no undercarriage or tracks on this thing, so what actually wears out?
Being a wheeled tractor, the wear items are tires, wheel and axle bearings, the kingpin and fifth-wheel coupling, and the rear disc brakes. Service brakes are oil-cooled discs on the rear axle; front brakes were not standard on early production and only became standard partway through the serial run. Because the tractor does all the pulling and stopping for a loaded bottom-dump wagon behind it, the fifth-wheel mounting area and surrounding frame take more stress than a rigid dump truck of similar size carries on its own frame. Cracking around hitch mounts and reinforcement plates, plus kingpin and coupling-plate wear from constant pivoting load, are the patterns to watch for. Have your dealer or a qualified shop verify any hitch, frame, or brake finding before returning the rig to service.
Are all 768Bs basically the same, or does the spec change across the production run?
There's a documented running change partway through the serial range. Earlier production used a fiberglass cab and relied on rear disc brakes only. Later-serial units switched to a steel cab and added front brakes as standard, along with an improved service and emergency brake setup. The fiberglass cab was prone to cracking over time, which is part of why the steel cab replaced it. When comparing two 768Bs, check which side of that serial break a given unit falls on; the earlier truck is missing front brakes and running the older cab. Have your dealer verify brake configuration against the actual serial number before relying on it.
What electrical problems actually show up on these trucks?
This is a pre-electronic machine: mechanically governed engine, no ECM, nothing resembling a modern sensor. What actually needs attention on equipment of this age and class is the basic charging and starting circuit and the gauge-sender wiring: corroded ground straps and connectors from years of dust and washdown, worn starter and generator brushes and windings, and gauge senders (oil pressure switch, coolant temperature sender) that read wrong once the wiring insulation gets brittle with age. Zero fault codes is normal and expected; there is no system to generate one. Treat an odd-reading gauge as a wiring, sender, or ground problem first, not an engine fault.
What should someone know about driving and backing the tractor-wagon combination?
Because it's a fifth-wheel tractor pulling a separate bottom-dump wagon rather than one rigid frame, the rig behaves like a truck and trailer, not an articulated scraper. It will jackknife if handled carelessly. Operators running these rigs recommend small steering inputs when backing, since the wagon pivots around the kingpin behind the tractor's rear axle and a large steering angle folds the combination faster than it can be corrected. Line up as straight as possible before starting a backing move, work at idle speed, and if it starts to fold, pull forward to straighten out rather than steering through it.
What should I check before buying a used 768B?
Focus on the frame and fifth-wheel/hitch area for cracking or old repair welds, since that's the highest-stress point on this configuration. Check kingpin and coupling-plate wear. Identify which side of the mid-production serial break the unit falls on (fiberglass cab and rear-brakes-only versus steel cab with front and rear brakes) so you know what you're actually buying. Check D343TA compression and oil consumption; a tired pre-chamber diesel shows up as hard cold starts and blue smoke under load. Check transmission and converter fluid condition, since the shared sump means contaminated oil affects both systems at once. Confirm the paired wagon is a proper match for the hitch and brake-sync system rather than an improvised pairing. Parts support for this generation is thin compared to later Cat trucks, so factor that into the price. Have your dealer verify frame, hitch, and brake condition with a hands-on inspection before purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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