Caterpillarchallenger
Caterpillar MT765
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar MT765 is a heavy-tillage-class rubber-belted (Mobil-trac) row-crop tractor built for high-horsepower tillage, planting, and seeding work. The base MT765 and MT765B run Caterpillar's own 8.8-liter (537 cu in) turbocharged inline-six diesel rated at 306 hp gross with about 255 hp claimed at the PTO; the MT765C carries the same 8.8L block re-branded as the C9 ACERT at roughly 320 hp gross. Operating weight runs about 13,390 kg (29,520 lb) on the base machine, rising to roughly 14,095-14,100 kg (31,075-31,085 lb) on the B and C generations, with fully ballasted weight reaching up to 16,329 kg (36,000 lb). Built across 2002 through 2011 for the Caterpillar-engined generations, the tractor pairs a 16-speed/4-range Cat PowerShift transmission with a Cat Differential Steering unit instead of conventional axles, and is offered with a factory choice of 457 mm (18 in), 635 mm (25 in), or 762 mm (30 in) belt widths and adjustable track gauge to match row-crop spacing.
Caterpillar sold its agricultural tractor business to AGCO in 2002, but Cat/Challenger branding and the Cat 8.8L engine carried through the MT765B and MT765C before AGCO moved to its own AGCO Power engines - an 8.4L six in the 2012-2013 MT765D and a 9.8L seven-cylinder in the 2014-2017 MT765E - a change that also brought Tier 4 SCR/DEF emissions systems the earlier Cat-engined machines never carried. That split matters to buyers today: owners generally rate the Cat-powered base, B, and C machines as the more trouble-free choice, while the AGCO Power-engined D-series draws more complaints once out of factory warranty, mostly tied to emissions-system upkeep. On the used and parts market, the Cat-engined MT765/MT765B/MT765C are the generations searched for Cat-specific engine, transmission, and undercarriage parts, while wear items common to the whole family - idler and final-drive bearings, three-point lift-arm bushings, and the Mobil-trac belts themselves - drive most of the ongoing parts demand regardless of which engine is fitted.
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 MT765 specifications
Engine
| Engine model | Caterpillar 8.8L turbocharged inline 6-cylinder diesel on the base MT765; redesignated Caterpillar C9 ACERT (turbocharged, air-to-air aftercooled) from the MT765B and MT765C generations. Later MT765D/MT765E tractors moved to a non-Caterpillar AGCO Power 8.4L engine, a different engine family outside this Cat-engine spec set. |
| Displacement / cylinders | 8.8 L (537-538 cu in), 6 cylinders, bore x stroke 112 x 149 mm (4.41 x 5.87 in); 24-valve head on the C9 ACERT |
| Gross power - MT765 (base) | 306 hp (228 kW) at 2,100 rpm |
| Gross power - MT765B / MT765C | 320 hp (239 kW) at 2,100 rpm |
| PTO power (claimed) | 255 hp (190 kW) on the base MT765; 265 hp (198 kW) on MT765B and MT765C |
| Compression ratio | 16.0:1 |
| Emissions tier | Tier III / Interim Tier 3 across the Caterpillar-engined MT765, MT765B and MT765C generations |
Weights
| Operating weight - MT765 (base) | about 13,390 kg (29,520 lb) |
| Operating weight - MT765B / MT765C | 14,095-14,100 kg (31,075-31,085 lb); figure varies slightly by source |
| Maximum (ballasted) weight | up to 16,329 kg (36,000 lb), reported for both the base MT765 and MT765C |
| Shipping weight | not published as a separate figure from operating weight in available spec sheets for this tractor |
| Ground pressure | not published in available spec sheets for this model |
Dimensions
| Overall length | 5.92 m (19.42 ft / 233 in), consistent across MT765B and MT765C spec sheets |
| Overall width | 3.35-3.38 m (11.0-11.08 ft / 132-133 in); varies with the track-width option fitted |
| Overall height (to cab top) | 3.44-3.45 m (11.3 ft / 135.5 in); one source lists transport height up to 3.59 m with cab-mounted accessories |
| Wheelbase | 2.44 m (96 in) |
| Ground clearance | 36.5 cm (14.3-14.4 in) |
| Track gauge (adjustable) | adjustable via mid-wheel positioning; reported ranges vary by generation and track option, spanning roughly 1.5-4.1 m (60-160 in) - confirm the exact adjustment range for your specific serial and track width with your dealer |
Performance
| Maximum travel speed | about 39.6-40 km/h (24.6-25 mph) across generations |
| Drawbar power (tested) | 258.6 hp (193 kW) on the base MT765; 228.2 hp (170 kW) on MT765B/MT765C test data |
| PTO power (tested) | 298.8 hp (223 kW) on the base MT765; 320.7 hp (239 kW) on MT765B/MT765C test data |
| Fuel consumption (rated load) | about 64.3 L/hr (17.0 gal/hr) at full PTO load on MT765C; lower figures are reported at partial load |
| 3-point hitch lift capacity | 7,257 kg (16,000 lb) measured 610 mm (24 in) behind the ball ends, Category III/IIIN hitch |
| Rear PTO | independent, 1,000 rpm, 44.5 mm (1.75 in) shaft |
| Transmission | 16 forward / 4 reverse Cat PowerShift on all Cat-engined generations; the base MT765 also offered a 30-forward/8-reverse creeper option |
| Gradeability | not published in available spec sheets for this model |
Service capacities (summary)
| Fuel tank | standard 447 L (118 gal); optional up to 674-787 L (178-208 gal) depending on rear-axle and track-width configuration |
| Hydraulic system flow | standard pump 136-165 L/min (36-43.5 gpm); optional high-flow pump up to 223 L/min (59 gpm); system pressure 200 bar (2,900 psi) |
| Engine oil capacity | not confirmed from available public spec sheets for this model - check the Caterpillar/Challenger service manual |
| Cooling system capacity | not confirmed from available public spec sheets for this model - check the Caterpillar/Challenger service manual |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
MT765 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | approx. 30 L (7.9 US gal / ~32 qt) refill with filter change | Cat DEO / DEO-ULS diesel engine oil meeting API CJ-4/CI-4 and ACEA E9. SAE 15W-40 for temperate service, SAE 10W-30 for cold-start climates, full-synthetic 0W-40 or 5W-40 below about -20°C (-4°F). |
| Cooling system | not published in the service literature reviewed for this model; capacity varies with radiator/aftercooler configuration — confirm against the machine's own O&M manual or dealer | Cat ELC (Extended Life Coolant), premix or concentrate, freeze-protected to about -36°C (-33°F) at standard 50/50 dilution. Do not mix with conventional (green) coolant. |
| Fuel tank | standard 447 L (118 US gal); mid-size option 674 L (178 US gal) with 120-160 in. rear axle; maximum option 787 L (208 US gal) — tank size tied to rear-axle/gauge configuration | No. 2-D ultra-low-sulfur diesel (ULSD). Use No. 1-D or a winter blend below about -7°C (20°F) to prevent fuel gelling. |
| Transmission (16F x 4R Cat powershift) and differential-steering compartment | shares a combined reservoir with the hydraulic system, approx. 182 L (48 US gal) total fill as documented for the original MT765; later C-series literature references separate hydraulic and powertrain sight gauges, so reservoir split may vary by series/serial range — verify against the specific machine's O&M manual | Cat TDTO (Transmission/Drive Train Oil) meeting Cat TO-4 spec. SAE 10W for cold climates, SAE 30 for temperate service, SAE 50 for hot climates; Cat TDTO-TMS synthetic-blend as an all-season alternative. |
| Hydraulic system and reservoir (closed-center, load-sensing, pressure-flow compensated) | shares the same combined transmission/hydraulic reservoir noted above, approx. 182 L (48 US gal) total on the original MT765; standard pump flow 164.7 L/min (43.5 US gpm), optional 224.2 L/min (59 US gpm) — reservoir sizing may differ on B/C-series, confirm against serial-specific documentation | Cat TDTO (Transmission/Drive Train Oil), same fluid family as the transmission since both circuits draw from one system on this tractor. SAE 10W cold climates, SAE 30 temperate, SAE 50 hot climates. |
| Final drive / driver-wheel gearbox, each side | approx. 1.6 L (0.42 US gal) per side — single-source figure, confirm against the O&M manual before service | Cat TDTO gear oil, same specification family as the transmission/hydraulic system. |
| Undercarriage bearing housings — idler and mid-wheel rollers, each | approx. 0.25-0.5 L (0.07-0.13 US gal) each, varies by roller position (mid-wheel vs. idler) | Cat TDTO or equivalent gear oil. Note: the Mobil-trac belt itself has no grease zerks and needs no routine lubrication or adjustment — only the roller bearing housings take oil. |
| Axles / differentials | not applicable as a separate unit — this is a rubber-belt (Mobil-trac) track tractor; steering and drive functions run through a Cat Differential Steering unit built into the transmission case rather than conventional front/rear axle differentials | not applicable — fluid shared with the transmission/hydraulic system above |
| Grease points (pivot pins, 3-point hitch, drawbar, PTO shaft) | spec only, no published fill volume | Cat multipurpose EP-2 lithium-complex grease (e.g. Cat Advanced 3Moly Grease), NLGI 2. Mobil-trac undercarriage is sealed and excluded from routine greasing. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar MT765 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 3,000 h |
|
Servicing the MT765 beyond the schedule
Predictive Maintenance & Fluid Analysis
Run oil sampling on the Cat 8.8L/C9 ACERT engine and the shared transmission/hydraulic TDTO reservoir - contamination, not oil age, is the main driver of hydraulic pump wear on machines rotated across many implements. Track idler-wheel and final-drive bearing housing oil condition specifically; seepage at a reaction-arm bearing seal is the clearest early warning before a costly teardown. Watch for inching-pedal and hydraulic Canbus fault codes and log them before swapping sensors, since several share overlapping symptoms.
Corrective & Common Repairs
Expect recurring inching-pedal/clutch fault codes that leave the pedal unresponsive in gear; a position-sensor swap sometimes only masks a calibration issue, and every transmission oil change on the 16F/4R Cat PowerShift needs a follow-up recalibration or shift complaints return. Drive-wheel slip inside the Mobil-trac belt is usually packed mud or crop residue at the drive-wheel interface, not a defect - clear debris before chasing a mechanical cause. Transmission-filter, parking-brake, and brake-switch faults are common; pull the stored code first, not the part.
Overhaul & Rebuild Points
Final-drive (reaction-arm) bearings are the big-ticket rebuild item on this platform; early production used closer-spaced bearings that wore faster under heavy linkage loads before later units widened the spacing, so confirm which design is fitted before budgeting a rebuild. Mobil-trac belt life runs roughly 2,000 to 7,000 hours depending on soil type and operating style - inspect for cord exposure and edge wear before it fails in the field. Three-point link arms crack with age and heavy draft work; check them and the lift-arm bushings during any major service.
Seasonal & Environment Servicing
Clear packed mud, crop residue, and snow from the drive-wheel-to-belt interface before storage or extended idle - buildup there is the most common cause of drive-wheel slip. In cold climates, switch to a lower-viscosity Cat DEO grade, or full-synthetic below about -20°C (-4°F), and run winter-blend or No. 1-D diesel below about -7°C (20°F) to prevent fuel gelling. Before wet-season tillage or planting, check the fan belt and bearing - a failed bearing can shed debris into the radiator - and confirm coolant freeze protection on the Cat ELC system.
MT765 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 1R-0762 | Filter As-Fuel | Fuel system service | Check fitment → |
| 161-1705 | Sensor As-Pressure | Lubrication service | Check fitment → |
| 1R-0716 | Filter As-Engine Oil | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
MT765 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 100-3 (100-4) | Engine oil pressure sensor circuit reading out of range - voltage above normal (100-3) or below normal (100-4). | Open or shorted sensor wiring/connector, corroded pins, or a failed oil pressure sensor. | Inspect the sensor connector and harness for corrosion or damage; confirm actual oil pressure with a mechanical gauge before condemning the sensor. |
| 110-3 (110-4) | Coolant temperature sensor circuit reading out of range - voltage above normal (110-3) or below normal (110-4). | Sensor wiring open or shorted, poor ground, or a failed coolant temperature sensor. | Check the sensor connector and wiring for damage; verify coolant level and sensor resistance against spec before replacing the sensor. |
| 102-3 (102-4) | Boost/intake manifold pressure sensor circuit fault - voltage above normal (102-3) or below normal (102-4). | Sensor wiring open or shorted, damaged connector, or sensor failure. | Inspect wiring and connector, check for oil or moisture intrusion at the sensor, and test sensor supply voltage before replacement. |
| 168-2 (168-3/168-4) | Electrical system (battery) voltage erratic (168-2) or out of normal charging range, high (168-3) or low (168-4). | Loose or corroded battery/ground connections, a failing alternator or voltage regulator, or a weak battery. | Load-test the battery, check alternator output and belt tension, and clean and tighten all ground and power connections. |
| 190-8 | Engine speed/timing sensor signal abnormal or lost. | Damaged sensor wiring, excessive sensor-to-tone-wheel air gap, or a failed speed/timing sensor. | Check sensor gap and wiring continuity, inspect the connector for corrosion, and replace the sensor if the signal stays erratic with the harness confirmed good. |
| E360 | Low engine oil pressure event - pressure has dropped below the programmed warning/derate/shutdown threshold for the current engine speed. | Low oil level, worn oil pump or bearings, a plugged suction screen, or a faulty pressure sensor. | Stop and check oil level immediately, verify actual pressure with a mechanical gauge, and do not restart until the cause is found. |
| E361 | High engine coolant temperature event - coolant temperature exceeded the programmed warning/derate/shutdown threshold (roughly mid-110s C / low-240s F on this engine). | Low coolant level, a plugged radiator core or debris screen, a failed fan drive or thermostat, or a faulty coolant temperature sensor. | Check coolant level and radiator for debris, verify fan operation, and confirm sensor reading against actual temperature before further diagnosis. |
| E362 | Engine overspeed event - engine RPM exceeded the programmed overspeed threshold. | Downhill overrun without adequate engine braking, a transmission/driveline fault allowing the engine to over-rev, or a faulty speed sensor reading. | Review recent operating conditions, check for correct transmission shift behavior, and verify sensor readings before returning the machine to service. |
| 444-5 | Start relay circuit - current below normal / open circuit. | Open wiring or a bad connection to the start relay, a blown fuse, or a failed relay. | Check the start relay, its fuse, and the associated wiring and connectors for continuity before replacing the relay. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
MT765 attachments & work tools
Rear three-point hitch / linkage
Category III/IIIN rear linkage, electronically controlled, with integrated track-slip control for trailed and mounted implements. Rated lift capacity is about 7,257 kg (16,000 lb), standard equipment on this model.
PTO (power take-off)
Standard independent rear PTO running 1000 rpm on a 1-3/4 in (44 mm) shaft. Dyno-tested PTO output runs roughly 250-265 hp depending on series and test standard used.
Drawbar
Swinging drawbar standard for pull-type tillage, planting, and seeding tools, working with the electronic track-slip control to protect traction under load. Tested drawbar output varies by series, from about 170 kW (228 hp) up to roughly 193 kW (259 hp).
Hydraulic remotes / SCVs
Closed-center, load-sensing, pressure-flow-compensating hydraulic system feeding 4 to 6 electro-hydraulic remote valves with power-beyond capability for hydraulically driven trailed tools. Standard pump flow is reported at roughly 136-165 L/min (36-43.5 gpm) depending on series/spec, with an optional high-flow pump near 223 L/min (59 gpm) for demanding tools; system pressure runs about 200 bar (2,900 psi).
Track undercarriage / ground-engagement
Mobil-trac rubber-belt undercarriage (no wheel/tire option) using a pivoting tri-roller mid-bogie to keep the belt in ground contact under pulling load. Belt widths documented for this model include 457 mm (18 in) and 635 mm (25 in), with 762 mm (30 in) also fitted in some markets; track gauge/tread is adjustable across a wide row-crop-spacing range.
Front ballast weights
Cast idler-frame weights mount at the front of each track frame; standard fitment is about 8 x 57 kg blocks, expandable up to roughly 24 x 57 kg (about 12 per side) to counter heavy mounted or semi-mounted implements. Full ballast is used to hold the tractor near its natural 60/40 front-to-rear static weight split under load with a trailed implement.
Guidance / autosteer provisioning
Factory- or dealer-fit provision for Trimble autosteer (motor-drive steering-wheel kits and integrated AutoPilot-type systems) is documented across this model's generations, letting it run guided tillage, planting, and seeding passes. Exact kit compatibility depends on the cab display and control system fitted to the individual unit, so match the kit to the serial/generation before ordering.
Compatible pull-type work tools
Primary work-tool families for this drawbar/PTO/horsepower class are tillage tools (chisel plows/rippers, disc harrows, field cultivators) and toolbar-mounted planters, drills, and seeders run off the drawbar and rear hydraulic remotes. Practical working width and shank count are set by soil condition, ballast, and the implement maker, not by a single published tractor limit.
All MT765 assemblies by section
Every catalogued assembly group for the Caterpillar MT765. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
174-1590 Elbow Gp-Air Inlet
| 17***90 | Elbow Group-Air Inlet | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
| 20***60 | Elbow-Air Inlet | 1 |
173-6107 Elbow Gp-Air Inlet
| 13***53 | Stud; (M8x1.25x82.75-mm)(M8x1.25x82.75-mm) | 8 |
| 17***07 | Elbow Group-Air Inlet | 1 |
| 18***71 | Elbow-Air Inlet | 1 |
171-4687 Manifold Gp-Exhaust
| 11***15 | Stud-Taperlock; (M10x85-mm Oal) | 12 |
| 16***98 | Manifold-Exhaust | 2 |
| 16***11 | Gasket | 6 |
165-4444 Manifold Gp-Exhaust
| 11***15 | Stud-Taperlock; (M10x85-mm Oal) | 12 |
| 16***98 | Manifold-Exhaust | 1 |
| 16***11 | Gasket | 6 |
191-5518 Turbocharger Gp
| 19***94 | Turbocharger Group | 1 |
| 19***18 | Turbocharger Group | 1 |
| 1P***51 | Gasket; (Turbocharger) | 1 |
206-4013 Turbocharger Gp
| 1P***51 | Gasket; (Turbocharger) | 1 |
| 20***47 | Turbocharger Group | 1 |
| 20***13 | Turbocharger Group | 1 |
191-5094 Turbocharger Gp
| 13***01 | Housing-Turbine | 1 |
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 19***94 | Turbocharger Group | 1 |
206-2947 Turbocharger Gp
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 16***63 | Clamp | 2 |
| 17***20 | Hose; (Wastegate) | 1 |
193-3346 Turbocharger Gp
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 16***63 | Clamp | 2 |
| 17***91 | Hose; (Wastegate) | 1 |
169-3121 Turbocharger Gp
| 16***21 | Turbocharger Group | 1 |
| 19***46 | Turbocharger Group | 1 |
| 1P***51 | Gasket; (Turbocharger) | 1 |
Basic Engine
164-6100 Camshaft Gp
| 10***94 | Plate-Thrust | 1 |
| 16***00 | Camshaft Group | 1 |
| 1B***05 | Key; (Woodruff) | 1 |
189-6308 Cover Gp-Cylinder Block
| 18***08 | Cover Group-Cylinder Block | 1 |
| 5F***81 | Gasket To Flywheel Housing Drain Tube Assembly | 1 |
| 5F***59 | Flange | 1 |
183-3649 Cover Gp-Cylinder Block
| 18***49 | Cover Group-Cylinder Block; -Rear | 1 |
| 20***87 | Breather As; (Crankcase) | 1 |
| 21***10 | Gasket | 1 |
118-1727 Cover Gp-Front Housing
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 13***19 | Seal-Integral; (Integral) | 1 |
| 4W***26 | Cover | 1 |
166-1775 Cover Gp-Front Housing
| 06***55 | Seal-O-Ring (Id=47.22mm) | 1 |
| 12***57 | Washer; (10.85x19.3x1.27-mm Thk) | 2 |
| 13***22 | Stud | 2 |
216-3047 Cover Gp-Front Housing
| 06***55 | Seal-O-Ring (Id=47.22mm) | 1 |
| 06***97 | Cap-Oil Filler; (Engine Oil) | 1 |
| 12***57 | Washer; (10.85x19.3x1.27-mm Thk) | 2 |
164-6490 Cover Gp-Valve Mechanism
| 16***90 | Cover Group-Valve Mechanism | 1 |
| 20***39 | Fastener Assem. | 9 |
| 21***01 | Seal-Bulk; (23-Dm)(Valve Mechanism Cover) | 0 |
164-6148 Crankshaft Gp
| 15***39 | Bearing-Main; (Standard) | 7 |
| 16***47 | Crankshaft Assem. | 1 |
| 16***66 | Plate-Thrust | 2 |
204-9538 Cylinder Block As
| 0L***26 | Plug -13mm(.512 In.) Outside Dia. | 2 |
| 17***54 | Bolt-Hex Head; (M16x160mm) | 14 |
| 20***05 | Bearing-Sleeve; (Camshaft) | 2 |
221-3248 Cylinder Block As
| 0L***26 | Plug -13mm(.512 In.) Outside Dia. | 2 |
| 17***54 | Bolt-Hex Head; (M16x160mm) | 14 |
| 20***05 | Bearing-Sleeve; (Camshaft) | 2 |
161-3406 Cylinder Block Gp
| 0S***19 | Plug-Cup | 1 |
| 16***06 | Cylinder Block Group | 1 |
| 1W***07 | Sleeve | 2 |
204-9539 Cylinder Block Gp
| 03***53 | Seal-O-Ring; (08.92mm Id) | 1 |
| 16***24 | Seal-Liner | 6 |
| 19***62 | Liner-Cylinder Block | 6 |
220-1952 Cylinder Block Gp
| 03***53 | Seal-O-Ring; (08.92mm Id) | 1 |
| 16***24 | Seal-Liner | 6 |
| 19***62 | Liner-Cylinder Block | 6 |
201-2180 Cylinder Head As
| 17***88 | Seat-Valve | 12 |
| 17***90 | Seat-Valve | 12 |
| 17***37 | Sleeve-Injector | 6 |
210-5985 Cylinder Head As
| 17***88 | Seat-Valve | 12 |
| 17***90 | Seat-Valve | 12 |
| 21***85 | Cylinder Head As | 1 |
210-5984 Cylinder Head Gp
| 15***06 | Seal-O-Ring; (11.89mm Id) | 5 |
| 16***42 | Valve; (Intake) | 12 |
| 16***44 | Guide-Valve | 24 |
201-2181 Cylinder Head Gp
| 03***53 | Seal-O-Ring; (08.92mm Id) | 6 |
| 15***06 | Seal-O-Ring; (11.89mm Id) | 5 |
| 16***42 | Valve; (Intake) | 12 |
210-5987 Cylinder Head Gp
| 16***71 | Fastener Group-Cylinder Head | 26 |
| 18***15 | Gasket Assem. | 1 |
| 21***84 | Cylinder Head Group | 1 |
161-3405 Cylinder Head Gp
| 16***05 | Cylinder Head Group | 1 |
| 16***71 | Fastener Group-Cylinder Head | 26 |
| 18***15 | Gasket Assem. | 1 |
192-3833 Damper & Pulley Gp
| 15***36 | Pulley-Crankshaft; (8-Groove) | 1 |
| 16***21 | Damper Assem. | 1 |
| 19***33 | Damper & Pulley Group | 1 |
169-3539 Damper & Pulley Gp
| 15***36 | Pulley-Crankshaft; (8-Groove) | 1 |
| 16***39 | Damper & Pulley Group | 1 |
| 20***19 | Damper As | 1 |
202-0103 Drain Gp-Engine Oil
| 20***03 | Drain Group-Engine Oil | 1 |
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 1 |
| 6V***38 | Valve-Shutoff; (Engine Oil Pan Drain) | 1 |
202-2025 Drive Gp-Fan
| 10***26 | Retainer-Bearing | 1 |
| 11***38 | Plate; (Thrust) | 1 |
| 12***56 | Shaft-Fan | 1 |
167-0171 Fastener Gp-Cylinder Head
| 16***71 | Fastener Group-Cylinder Head | 1 |
| 18***63 | Bolt; (M16x2x180-mm) | 1 |
| 9X***68 | Washer; (17.5x30x3.5-mm Thk) | 1 |
169-3106 Fastener Gp-Engine
| 16***06 | Fastener Group-Engine | 1 |
| 4K***90 | Washer; (8.6x17.3x1.6-mm Thk) | 6 |
| 6V***19 | Bolt; (M8x1.25x40-mm) | 6 |
117-2794 Fastener Gp-Flywheel
| 11***94 | Fastener Group-Flywheel; (Flywheel) | 1 |
| 5P***47 | Washer (Bracket To Valve Support) | 8 |
| 9X***21 | Bolt; (Locking) (M16x2.0x45mm) | 8 |
166-1788 Fastener Gp-Front Housing
| 16***88 | Fastener Group-Front Housing | 1 |
| 6V***17 | Bolt; (M8x1.25x30-mm)(Location Z) | 5 |
| 8T***00 | Bolt (M8x1.25x60mm); (M8x1.25x60-mm) | 1 |
116-4556 Fastener Gp-Front Housing
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 5P***45 | Washer-Hard; (13.5x25.5x3-mm Thk)(Turbocharger Blanking Plate) | 6 |
| 6V***36 | Bolt; (M12x1.75x70-mm) | 6 |
173-7123 Fastener Gp-Front Housing
| 17***23 | Fastener Group-Front Housing | 1 |
| 6V***17 | Bolt; (M8x1.25x30-mm)(Location Z) | 4 |
| 8T***00 | Bolt (M8x1.25x60mm); (M8x1.25x60-mm) | 1 |
201-5534 Flywheel Gp
| 15***05 | Pulley-Rear | 1 |
| 16***87 | Gear-Flywheel; (134-Teeth)(Id 405.14mm) | 1 |
| 17***86 | Bolt; (M16x2x115-mm) | 8 |
145-9112 Flywheel Gp
| 14***53 | Flywheel As | 1 |
| 14***12 | Flywheel Group | 1 |
| 4N***14 | Gear; (113-Teeth)(Flywheel Starter) | 1 |
171-4684 Flywheel Gp
| 15***05 | Pulley-Rear | 1 |
| 16***56 | Flywheel As | 1 |
| 16***87 | Gear-Flywheel; (134-Teeth)(Id 405.14mm) | 1 |
155-7918 Gear Gp-Front
| 11***69 | Plate-Thrust | 1 |
| 11***72 | Bearing | 1 |
| 11***19 | Plate-Retaining | 1 |
155-7935 Housing Gp-Flywheel
| 06***55 | Seal-O-Ring (Id=47.22mm) | 1 |
| 15***35 | Housing Group-Flywheel | 1 |
| 1P***69 | Plug-Seal; (Flywheel Housing Drain) | 3 |
165-4446 Housing Gp-Front
| 16***46 | Housing Group-Front | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
| 23***16 | Housing-Front | 1 |
193-3293 Lifting Gp-Engine
| 19***93 | Lifting Group-Engine | 1 |
| 19***94 | Plate-Lift Eye | 1 |
| 5P***45 | Washer-Hard; (13.5x25.5x3-mm Thk)(Turbocharger Blanking Plate) | 3 |
169-3113 Lifting Gp-Engine
| 16***85 | Plate-Lifting; (Rear) | 1 |
| 16***13 | Lifting Group-Engine | 1 |
| 5P***45 | Washer-Hard; (13.5x25.5x3-mm Thk)(Turbocharger Blanking Plate) | 3 |
187-3884 Mounting Gp-Fan Drive
| 18***84 | Mounting Group-Fan Drive | 1 |
| 18***87 | Support As-Fan | 1 |
| 18***56 | Block | 1 |
187-3076 Pan Gp-Oil
| 18***85 | Pan-Oil; (Engine Oil) | 1 |
| 18***76 | Pan Group-Oil; -Engine | 1 |
| 19***14 | Gasket-Oil Pan; (Engine) | 1 |
188-9141 Piston & Rod Gp
| 15***51 | Skirt-Piston | 1 |
| 16***72 | Bearing-Connecting Rod | 1 |
| 16***97 | Bolt | 2 |
177-7878 Piston Gp
| 17***78 | Piston Group | 1 |
| 18***41 | Piston & Rod Group | 6 |
169-3105 Plug Gp-Engine
| 16***05 | Plug Group-Engine | 1 |
| 3D***24 | O-Ring - For Oil Drain & Level Plug (Items 3 & 7) | 1 |
| 6V***49 | Seal-O-Ring (Id=11.89mm); (11.89-mm Id) | 2 |
206-6437 Plug Gp-Engine
| 20***37 | Plug Group-Engine | 1 |
| 3D***24 | O-Ring - For Oil Drain & Level Plug (Items 3 & 7) | 2 |
| 5P***17 | Adapter- To Logic Valve 1u***59 | 1 |
7e-2313 Drain Gp-Engine Oil
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 1 |
| 7E***13 | Plug Group-Oil Pan | 1 |
| 9X***30 | Plug-Drain; (Magnetic)(Engine Oil Pan) | 1 |
193-1726 Pulley Gp
| 10***26 | Retainer-Bearing | 1 |
| 11***38 | Plate; (Thrust) | 1 |
| 12***56 | Shaft-Fan | 1 |
175-3223 Pulley As-Idler
| 12***90 | Bolt; (M10x1.5) | 1 |
| 12***91 | Cover-Dust | 1 |
| 12***92 | Pulley As-Idler; (8-Groove) | 1 |
213-9320 Rocker Arm Gp -Exhaust
| 16***47 | Rocker Arm As | 1 |
| 18***65 | Screw-Adjustment; (M10x1.5-Thd) | 1 |
| 21***20 | Rocker Arm Group; -Exhaust | 1 |
213-9321 Rocker Arm Gp -Intake
| 16***49 | Rocker Arm As | 1 |
| 18***65 | Screw-Adjustment; (M10x1.5-Thd) | 1 |
| 21***21 | Rocker Arm Group; -Intake | 1 |
178-3899 Seal Gp-Crankshaft
| 11***21 | Seal Group-Crankshaft; (Front) | 1 |
| 17***99 | Seal Group-Crankshaft | 1 |
| 18***61 | Seal Group-Crankshaft; (Rear) | 1 |
185-5334 Support Gp-Engine
| 18***34 | Support Group-Engine; -Front | 1 |
| 20***44 | Support-Engine | 2 |
| 6V***44 | Bolt; (M16x2.0x35mm) | 4 |
171-4685 Support Gp-Engine
| 16***06 | Support-Rear | 1 |
| 17***85 | Support Group-Engine | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
155-7927 Valve Mechanism Gp
| 13***79 | Rod-Valve Push; (Valve Push) | 12 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***37 | Lifter As-Valve | 12 |
163-2450 Valve Mechanism Gp
| 16***94 | Insert-Rocker Arm | 2 |
| 16***45 | Shaft As-Rocker Arm | 1 |
| 16***46 | Rocker Arm Group; (Exhaust) | 6 |
215-9571 Valve Mechanism Gp
| 16***45 | Shaft As-Rocker Arm | 1 |
| 16***59 | Spring | 6 |
| 16***69 | Stand; (End) | 2 |
Cooling System
188-3826 Cooler Gp-Engine Oil
| 18***26 | Cooler Group-Engine Oil | 1 |
| 20***93 | Gasket | 1 |
| 23***56 | Core As-Oil Cooler; (Engine) | 1 |
187-3066 Cover Gp-Water Outlet
| 18***07 | Seal-Integral | 1 |
| 18***36 | Cover | 1 |
| 18***66 | Cover Group-Water Outlet | 1 |
165-4461 Lines Gp-Water
| 14***11 | Plug Group | 2 |
| 16***61 | Lines Group-Water; -Water Temperature Regulator | 1 |
| 16***24 | Hose | 1 |
208-0440 Lines Gp-Water
| 16***24 | Hose | 1 |
| 19***57 | Gasket; (Water Regulator Housing)(Temperature) | 1 |
| 20***40 | Lines Group-Water; -Water Temperature Regulator | 1 |
205-4013 Plug Gp-Water Lines
| 20***13 | Plug Group-Water Lines; -Coolant | 1 |
| 20***34 | Plug-Cup; (73.38-mm Dia) | 2 |
| 7L***56 | Plug-Cup; (67.03-mm Dia) | 2 |
165-4478 Pump Gp-Water
| 16***78 | Pump Group-Water | 1 |
| 18***82 | Pump Group-Water | 1 |
| 2M***53 | Seal--To Seal Brake Housing To Main Housing | 1 |
187-8982 Pump Gp-Water
| 06***69 | Stem | 1 |
| 14***88 | Seal As; (Water Pump) | 1 |
| 17***44 | Cover | 1 |
208-0333 Pump Gp-Water
| 20***32 | Pump Group-Water | 1 |
| 20***33 | Pump Group-Water | 1 |
| 2M***53 | Seal--To Seal Brake Housing To Main Housing | 1 |
208-0332 Pump Gp-Water
| 14***88 | Seal As; (Water Pump) | 1 |
| 17***44 | Cover | 1 |
| 17***52 | Shaft As | 1 |
Electrical And Starting System
117-1379 Alternator Gp-Charging
| 03***12 | Screw-Forming; (10-24x0.5-In) | 3 |
| 10***86 | Stator As-Alternator | 1 |
| 11***79 | Alternator Group-Charging | 1 |
188-3506 Alternator Gp-Charging
| 11***79 | Alternator Group-Charging | 1 |
| 12***40 | Support-Alternator | 1 |
| 13***82 | Support-Alternator | 1 |
208-2385 Connection Gp-Electrical
| 10***29 | Stud; (M10x1.5-Thd) | 1 |
| 10***03 | Cap; (Stud Protector) | 1 |
| 20***85 | Connection Group-Electrical | 1 |
206-6446 Connection Gp-Electrical
| 20***46 | Connection Group-Electrical; -Air Inlet Heater | 1 |
| 20***96 | Cable As | 1 |
| 3T***88 | Terminal-Ring; (4-Ga, 7/16-In Screw) | 1 |
180-6004 Connection Gp-Electrical
| 10***29 | Stud; (M10x1.5-Thd) | 1 |
| 10***03 | Cap; (Stud Protector) | 1 |
| 18***04 | Connection Group-Electrical | 1 |
165-4468 Control & Mtg Gp-Engine Elek
| 10***28 | Spacer-Special; (12.7x26x28.7-mm Thk) | 2 |
| 16***68 | Control & Mtg Group-Engine Elek | 1 |
| 16***11 | Spacer | 2 |
196-4172 Control Gp-Engine Electronic
| 18***72 | Screw-Pan Head; (No 8-32x9.52-mm)(Wax Coated) | 1 |
| 19***72 | Control Group-Engine Electronic | 1 |
| 7X***15 | Strap; (Grounding) | 1 |
196-4173 Control Gp-Engine Electronic
| 19***72 | Control Group-Engine Electronic | 1 |
| 19***73 | Control Group-Engine Electronic | 1 |
201-0194 Heater Gp-Air Inlet
| 19***59 | Heater As-Air Inlet | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
| 20***94 | Heater Group-Air Inlet | 1 |
205-6289 Heater Gp-Jacket Water
| 18***36 | Cord As; -Jacket Water Heater | 1 |
| 20***89 | Heater Group-Jacket Water | 1 |
| 20***34 | Plug-Cup; (73.38-mm Dia) | 2 |
4p-1479 Heater Gp-Starting Aid
| 15***11 | Heater As; (Starting Aid) | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
| 4P***79 | Heater Group-Starting Aid; -Air Inlet Heater | 1 |
177-9816 Mounting Gp-Solenoid
| 17***16 | Mounting Group-Solenoid; -Starting Aid | 1 |
| 19***85 | Bracket | 1 |
| 3E***53 | Washer-Hard; (11x25x3-mm Thk) | 2 |
165-4469 Sensor Gp-Engine
| 11***85 | Seal-O-Ring; (13.94mm Id) | 2 |
| 13***11 | Sensor Group-Temperature; (Transmission Lubrication Oil) | 2 |
| 13***67 | Seal-O-Ring | 1 |
169-3300 Sensor Gp-Speed -Timing
| 16***00 | Sensor Group-Speed; -Engine Timing | 1 |
191-6587 Sensor Gp-Temperature -Engine Oil
| 15***43 | Sleeve; (2.8-Dm) | 0 |
| 15***61 | Wedge-Plug Lock; (2-Pin) | 1 |
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
130-9811 Sensor Gp-Temperature
| 13***11 | Sensor Group-Temperature; (Transmission Lubrication Oil) | 1 |
207-1524 Starting Motor Gp-Electric
| 03***23 | Bolt; (1/4-28x1-In) | 5 |
| 20***89 | Kit-Solenoid; (12-Volt)(Starting Motor) | 1 |
| 20***24 | Starting Motor Group-Electric | 1 |
101-8936 Starting Motor Gp-Electric
| 10***36 | Starting Motor Group-Electric | 1 |
| 15***25 | Gasket | 1 |
| 20***24 | Starting Motor Group-Electric | 1 |
175-2303 Switch Gp-Magnetic -Air Inlet Heater
| 01***80 | Lockwasher | 2 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 17***03 | Switch Group-Magnetic; -Air Inlet Heater | 1 |
209-1953 Wiring Gp-Electronic Control
| 00***35 | Protector | 1 |
| 10***20 | Plug As-Connector; (2-Pin) | 1 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 2 |
188-9869 Wiring Gp-Electronic Control
| 00***35 | Protector | 1 |
| 01***80 | Lockwasher | 2 |
| 10***20 | Plug As-Connector; (2-Pin) | 1 |
Engine Arrangement
194-4160 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
177-1418 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
177-1416 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
179-4954 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
177-1414 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
179-4958 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
179-4956 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
177-1420 Engine Ar
| 10***36 | Starting Motor Group-Electric | 1 |
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***94 | Fastener Group-Flywheel; (Flywheel) | 1 |
179-4952 Engine Ar
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 16***90 | Cover Group-Valve Mechanism | 1 |
177-1419 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***06 | Cylinder Block Group | 1 |
194-4161 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***06 | Cylinder Block Group | 1 |
177-1417 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***06 | Cylinder Block Group | 1 |
177-1421 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***05 | Cylinder Head Group | 1 |
177-1415 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***06 | Cylinder Block Group | 1 |
Frame And Body
206-5947 Mounting Gp -Solenoid
| 20***46 | Bracket | 1 |
| 20***47 | Mounting Group; -Solenoid | 1 |
| 3E***53 | Washer-Hard; (11x25x3-mm Thk) | 2 |
Fuel System
217-2570 Injector Gp-Fuel
| 10***07 | Seal-O-Ring; (Fuel System) | 1 |
| 14***03 | Seal-O-Ring; (Fuel System) | 1 |
| 14***40 | Ring-Backup; (37.36mm Od), Flasher Switch; Hazard, Replaces 421164a1, Flasher Switch | 1 |
236-0962 Injector Gp-Fuel
| 10***07 | Seal-O-Ring; (Fuel System) | 1 |
| 14***03 | Seal-O-Ring; (Fuel System) | 1 |
| 14***40 | Ring-Backup; (37.36mm Od), Flasher Switch; Hazard, Replaces 421164a1, Flasher Switch | 1 |
204-7454 Lines Gp-Fuel
| 03***42 | Elbow Hose Assembly To | 1 |
| 03***47 | Elbow-Filtered Fuel From Based Assembly | 2 |
| 12***33 | Clip | 1 |
189-3803 Lines Gp-Fuel Filter
| 00***15 | Insert | 1 |
| 03***42 | Elbow Hose Assembly To | 1 |
| 03***47 | Elbow-Filtered Fuel From Based Assembly | 1 |
172-5780 Pump Gp-Unit Injection
| 17***80 | Pump Group-Unit Injection | 1 |
| 23***51 | Bolt-Socket Head; (M8x1.25x65-mm) | 2 |
| 23***62 | Injector Group-Fuel | 1 |
166-1759 Pump Gp-Unit Injection
| 16***59 | Pump Group-Unit Injection | 1 |
| 17***80 | Pump Group-Unit Injection | 6 |
204-4944 Pump Gp-Unit Injector Hyd
| 20***44 | Pump Group-Unit Injector Hydraulic | 1 |
165-4450 Pump Gp-Unit Injector Hyd
| 03***50 | Elbow (Check Valve Drain Tube) | 1 |
| 15***06 | Seal-O-Ring; (11.89mm Id) | 3 |
| 15***07 | Seal-O-Ring | 2 |
Lubrication System
183-3700 Filter Gp-Engine Oil
| 03***53 | Seal-O-Ring; (08.92mm Id) | 1 |
| 18***56 | Base As-Oil Filter | 1 |
| 18***00 | Filter Group-Engine Oil | 1 |
206-6441 Filter Gp-Engine Oil
| 1R***16 | Filter As-Engine Oil; (Standard Efficiency) | 1 |
| 20***62 | Seal | 1 |
| 20***41 | Filter Group-Engine Oil | 1 |
187-3077 Fumes Disposal Gp
| 18***77 | Fumes Disposal Group | 1 |
| 19***31 | Bracket | 1 |
| 19***10 | Hose-Fumes Disposal | 1 |
201-5535 Fumes Disposal Gp
| 12***71 | Clamp-Hose | 1 |
| 1D***64 | Spacer; (15.8x21.34x25-mm Thk) | 1 |
| 20***35 | Fumes Disposal Group | 1 |
187-0710 Gauge Gp-Oil Level (Dipstick)
| 18***10 | Gauge Group-Oil Level (Dipstick); -Engine | 1 |
| 18***16 | Tube As-Guide; (Rh) | 1 |
| 19***33 | Gauge-Oil Level; (Dipstick, Engine) | 1 |
176-5328 Gauge Gp-Oil Level (Dipstick)
| 17***28 | Gauge Group-Oil Level (Dipstick); -Engine | 1 |
| 18***14 | Gauge-Oil Level; (Dipstick, Engine) | 1 |
| 18***16 | Tube As-Guide; (Rh) | 1 |
188-3028 Lines Gp-Engine Oil
| 16***80 | Tube As | 1 |
| 18***28 | Lines Group-Engine Oil | 1 |
| 19***74 | Elbow-Outlet | 1 |
192-2833 Lines Gp-Engine Oil
| 03***34 | Seal-O-Ring | 1 |
| 19***33 | Lines Group-Engine Oil | 1 |
| 19***52 | Gasket | 1 |
188-8840 Lines Gp-Turbocharger Oil
| 18***99 | Connector As | 1 |
| 18***40 | Lines Group-Turbocharger Oil | 1 |
| 18***41 | Hose As | 1 |
165-4465 Lines Gp-Turbocharger Oil
| 16***65 | Lines Group-Turbocharger Oil | 1 |
| 16***66 | Tube As | 1 |
| 18***98 | Connector As | 1 |
195-8098 Pump Gp-Engine Oil
| 19***98 | Pump Group-Engine Oil; (Engine Oil) | 1 |
| 21***22 | Pump As-Engine Oil | 1 |
| 21***46 | Gerotor Pump Group | 1 |
Operator Station
188-3507 Compressor Gp-Refrigerant
| 12***37 | Support-Compressor | 1 |
| 18***07 | Compressor Group-Refrigerant | 1 |
| 2Y***29 | Nut-Hard; (M10 X 1.5) | 2 |
MT765 serial number reference
The PIN/serial plate sits on the main tractor frame, front left side. Read the first three characters as the model/plant/generation prefix and everything after as the sequential unit number; for early units (base/B-series) that prefix is a stable 3-letter code (AMS), while later C/D/E generations use a single leading letter (U/D/E/G) ahead of the running number instead of a fixed 3-letter block.
| Prefix | Identifies | Notes |
|---|---|---|
| AMS | MT765 base (2002-2004) and MT765B (2005-2008) | Cat-badged Challenger track tractor built by AGCO under license after Caterpillar transferred its Challenger ag-tractor design/assembly/marketing business to AGCO in Q1 2002 (agreement signed Dec 2001), continuing the Cat and Challenger names and livery. Built in Jackson, Minnesota. Caterpillar 8.8L 6-cylinder diesel. Serial run is continuous across base and B-series (AMS20000 for model year 2002, AMS30000 for 2003, AMS40000 for 2004, AMS50000 for 2005, AMS60000 for 2006, continuing upward through the 2008 close of B-series production), so AMS covers both generations under one counter. |
| U (Uxx1001-up) | MT765C, CE / Europe-spec (2009-2011) | Factory operator and service manual titles for the CE-market MT745C/MT755C/MT765C tractor line (issued in multiple languages) cite Uxx1001 as the starting serial reference. Still Caterpillar 8.8L 6-cylinder diesel, built Jackson, Minnesota. North American-spec MT765C units on resale listings show a longer, differently structured full PIN and do not visibly carry a clean leading U; confirm serial scheme with dealer for non-CE units. |
| D (Dxxx1001-up) | MT765D (2012-2013) | Factory parts book bounds the range as effective Dxxx1001 through Dxxx9999. Both the CE and non-CE operator manuals for this generation cite the same Dxxx1001 starting reference, unlike the C and E generations which split by market/emissions configuration. Engine changed from Caterpillar to an AGCO Power 8.4L 6-cylinder diesel (Tier 4 interim, SCR) - no longer Cat-sourced. Built Jackson, Minnesota. Full in-field PINs show a longer code beginning with D plus a plant/config string; the exact multi-character prefix beyond the leading D is inconsistent across listings - confirm with dealer. |
| E / G (Exxx1001-up / Gxxx1001-up) | MT765E (2014-2017) | Factory technical publications show two starting-serial references for this generation, split by emissions configuration: Exxx1001 for the DEF-equipped non-CE build and Gxxx1001 for a separate non-CE Tier 4 build. Engine is an AGCO Power 9.8L 7-cylinder diesel (Tier 4 Final, SCR), not Caterpillar. Built in the United States. Confirm which leading letter applies to a specific unit with the dealer. |
Frequently asked questions
What engine does the Caterpillar MT765 use?
The base MT765 and MT765B run Caterpillar's own 8.8-liter (537 cu in) turbocharged inline-six diesel rated at 306 hp gross; the MT765C carries the same 8.8L block re-branded as the C9 ACERT at about 320 hp gross. Later MT765D and MT765E generations switched to non-Caterpillar AGCO Power engines (8.4L and 9.8L) and belong to a different engine family - confirm which generation you have before sourcing Cat-specific engine parts.
What does the Caterpillar MT765 weigh?
Operating weight runs about 13,390 kg (29,520 lb) on the base MT765 and roughly 14,095-14,100 kg (31,075-31,085 lb) on the MT765B and MT765C; figures vary slightly by source and configuration. Fully ballasted weight can reach up to 16,329 kg (36,000 lb) depending on front weighting and belt-width setup.
What replaced the Caterpillar MT765?
Within the Cat-engined line, the MT765C was the last generation to use the Caterpillar 8.8L/C9 ACERT engine. AGCO then carried the nameplate forward on its own AGCO Power engines with the MT765D (2012-2013, 8.4L) and MT765E (2014-2017, 9.8L), still sold under Challenger/Cat branding rather than as an entirely new model name. AGCO's MT700E series was itself succeeded by newer Challenger track-tractor generations after 2019.
What MT765 owners discuss
Which engine does the MT765 actually run, and does it change across the series?
Base through C-series machines use Caterpillar's own C9 ACERT, an 8.8-liter (537 cu in) turbocharged, air-to-air aftercooled inline six rated in the mid-250s to mid-260s hp depending on model year and rating method (varies by configuration). Starting with the D-series, the factory switched to a Sisu/AGCO Power-built diesel, later reported as a 9.8-liter inline-seven on the E-series update. Owners and independent mechanics consistently rate the Cat-powered B and C machines as the more trouble-free choice; the Sisu-powered D is the generation people warn buyers away from once it's out of factory warranty, mainly over AdBlue/emissions-system headaches. Fuel burn also crept up on the C-series compared with earlier Cat-powered machines, per multiple owners.
What powertrain quirks should I expect from the transmission and inching pedal?
The 16-speed by 4-range Caterpillar powershift gearbox is over-built and gives long service life if the oil is changed on schedule, roughly every 1,000 hours, and the transmission is recalibrated after every oil change - skipping recalibration is a common cause of shifting complaints. A recurring nuisance fault is an inching-pedal/clutch fault code that leaves the pedal unresponsive when shifting into gear. Replacing the inching-pedal position sensor sometimes clears it temporarily, then a switch-response fault returns; a pedal recalibration procedure reportedly exists but is poorly documented even at dealer level. Riding the inching pedal like a clutch pedal accelerates this wear. Have your dealer verify sensor and calibration status before assuming a part is bad.
Is the hydraulic system prone to failure?
Not by design, according to most reports. The Canbus-controlled hydraulic system occasionally throws minor fault codes, but these are usually cheap, quick fixes rather than major failures. The real driver of hydraulic pump wear is contamination: machines rotated across many different implements pick up dirty oil, and that abrasive contamination wears out pump components over time rather than any hydraulic design flaw. Keeping the reservoir, filters, and coolers clean is the biggest lever owners report for avoiding pump problems.
What undercarriage wear patterns are typical for this machine?
The rubber-belt Mobil-trac undercarriage is generally well regarded, but a few wear points recur. Drive-wheel slip inside the belt is commonly reported and is usually traced to crop residue, mud, or other material packing between the drive wheel and the belt rather than a defect - clearing debris regularly and avoiding heavy mud reduces it. The reaction-arm (final drive) bearing is a known service item: any oil seepage at the bearing seal is treated as an early warning that replacement is coming, and reported service life on the original bearing varies widely by machine and how it was worked, so there is no fixed interval to plan around. Idler-wheel oil should be checked and changed periodically, commonly cited around every 400 hours, since degraded oil leads to seal failure; front idler oil is similarly change-sensitive, especially on machines that do a lot of road transport. Belt life is reported anywhere from roughly 2,000 to 7,000 hours depending on soil type and operating style (varies by configuration and use). Have your dealer verify bearing and seal condition before seepage turns into a full teardown.
What electrical or sensor faults come up most often?
Beyond the inching-pedal/clutch fault already noted, owners report transmission filter-clogging sensor codes, parking-brake sensor faults, and left/right brake switch faults. None of these have a widely shared DIY fix. The consistent advice from owners and dealers alike is to pull the stored fault code first rather than guessing at a sensor, since several of these faults share overlapping symptoms and swapping sensors blind has not reliably resolved them for people who tried.
Are there structural wear points worth inspecting, like the linkage or final drive?
On earlier machines in this family, the final drive used bearings mounted close together on each side, which wore prematurely under heavy linkage loads; later production widened that bearing spacing to address it, so confirming which final-drive design is fitted matters on an older example. On the three-point linkage, the bushings at the top of the lift arms wear and should be replaced on a regular interval - cheap insurance compared with replacing the arms themselves. The link arms are reported prone to cracking with age and heavy draft work. Have your dealer verify linkage and final-drive condition, since a cracked link arm or a failed final-drive bearing under load is a safety issue, not just a maintenance one.
What should I check before buying a used MT765?
Start by pinning down the exact series, since that determines the engine you're getting (Cat C9 on base through C-series, Sisu/AGCO Power on D and E) and therefore the risk profile. Pull stored fault codes rather than trusting a clean dash. Check transmission oil-change and recalibration history - roughly every 1,000 hours is the expected interval. Inspect the reaction-arm bearing seals for seepage and check idler-wheel and front-idler oil condition and change records. Look over the three-point link arms for cracking and the lift-arm bushings for play. Check the fan belt and its bearing, since a failed fan bearing can shed debris straight into the radiator. Walk the tracks and drive wheels for wear and clear any packed debris to properly judge belt condition. Given how expensive a transmission or final-drive rebuild can get on this class of machine, a specialist pre-purchase inspection is worth the cost before committing. Have your dealer or an independent inspector verify major driveline and undercarriage condition first.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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