Caterpillarchallenger
Caterpillar MTC755
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar MTC755 designation covers the Challenger MT755 rubber-track ag tractor, a 4WD row-crop and tillage machine built on Cat's Mobil-trac rubber-belted undercarriage in place of wheels or steel tracks. The base MT755 (2002-2004) ran a pre-ACERT Caterpillar inline-six HEUI diesel of 8.8 L, rated around 290 gross hp. The MT755B (2006-2008) and MT755C (2008 into the mid-2010s) carried the Tier 3 Cat C9 ACERT version of the same 8.8 L HEUI architecture, rated 301 gross hp and roughly 245 PTO hp. Operating weight runs from about 13.4 t (29,500 lb) on the base tractor up toward 15 t (33,000 lb) on heavier later configurations. All generations share a 16-speed full-power-shift transmission, electro-hydraulic differential steering, a Category III 3-point hitch rated near 7,257 kg (16,000 lb), 4 to 6 hydraulic remotes, and an independent 1,000-rpm rear PTO. The MT755 sits in AGCO's MT700-series line alongside the smaller MT735/MT745 and larger MT765. It was built at the former Caterpillar tractor plant in Jackson, Minnesota after AGCO bought Caterpillar's agricultural-equipment business in March 2002, and it carried Cat engines through the C-series before later D-series and E-series revisions switched to AGCO Power engines entirely.
Across its run the MT755 changed more in emissions control and hydraulics than in basic layout. The B and C revisions added ACERT emissions hardware to the same 8.8 L HEUI block and refined the hydraulic and electronic controls. Caterpillar also introduced a cassette-style final-drive seal to replace the original duo-cone face seal, which had a known history of weeping at the axle-shaft output. The ALM PIN prefix covers both the base and B-revision tractors; C-series prefix records are thinner in the field. Today the MTC755 is the last Challenger track tractor generation built around a genuine Caterpillar engine and Cat-sourced final drives, before AGCO moved the platform to its own AGCO Power engines. That draws buyers chasing Cat parts commonality, Cat dealer support, or a familiar HEUI powertrain. Values and parts demand track undercarriage condition more than hours alone: belt, mid-roller, and idler wear vary enormously between tractors run on soft field ground versus road transport, so pricing and parts sourcing stay highly condition-dependent.
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 MTC755 specifications
Engine
| Engine family | Caterpillar inline 6-cylinder diesel, 8.8 L (537 cu in) displacement, common across all MT755 generations. Turbocharged with air-to-air aftercooling. |
| Engine generation | 2001-2006 production tractors use a pre-ACERT Cat 8.8 L 6-cylinder diesel. 2006-2016 B-series and C-series tractors use the Cat C9 ACERT engine, Tier 3 emissions. |
| Gross power | 216 kW (290 hp) at 2100 rpm on 2001-2006 tractors. 224 kW (301 hp) at 2100 rpm on C9 ACERT-powered B/C-series tractors (2006-2016). |
| PTO power | Factory PTO rating of 175 kW (235 hp) on early tractors, with independent test results of 192-202 kW (257-270 hp) at the PTO. 183 kW (245 hp) at 2100 rpm on ACERT-engine B/C-series tractors. |
| Bore and stroke | 112 x 149 mm (4.41 x 5.87 in) |
| Compression ratio | 16.0:1 |
| Cylinders and valves | 6 cylinders; 24 valves (4 per cylinder) on the ACERT engine |
| Aspiration | Turbocharged, air-to-air aftercooled |
| Torque rise | 42% engine torque rise on the ACERT B/C-series spec sheet; related literature cites up to 52% PTO torque rise. Peak torque around 1400 rpm. |
| Fuel system | Hydraulic Electronic Unit Injection (HEUI) with full electronic control (ADEM A4) on the ACERT engine |
| Emissions tier | Tier 3, via Cat ACERT Technology, on 2006-2016 B/C-series tractors. Earlier 2001-2006 tractors predate the Tier 3 mandate. |
Weights
| Operating weight, 2001-2006 tractors | 13,320-13,399 kg (29,365-29,540 lb), varies by configuration |
| Shipping weight, B/C-series (2006-2016) | 14,095 kg (31,075 lb) per factory spec sheet on standard gauge. Some equipment databases show operating weight closer to 15,000 kg (33,000 lb) on wider-gauge or ballasted setups — varies by configuration. |
Dimensions
| Overall length | 5,917 mm (233 in), B/C-series |
| Overall width, wide gauge | 3,376 mm (133 in) |
| Height to top of cab | 3,444 mm (135.5 in) per factory spec sheet; some equipment databases show closer to 3.6 m (141 in), likely with beacons or antenna fitted — varies by configuration |
| Wheelbase (Mobil-trac track spacing) | 2,438 mm (96 in), the longest in its power class |
| Drawbar clearance | 365 mm (14.3 in) |
| Track gauge, standard | 1,524-2,235 mm (60-88 in), infinitely adjustable |
| Track gauge, wide | 2,032-3,048 mm (80-120 in) |
| Track gauge, ultra wide | 3,048-4,064 mm (120-160 in) |
| Belt (track) width options | 356-760 mm (14-30 in), depending on belt type and gauge selected |
| Front idler diameter | 940 mm (37 in) |
Performance
| Maximum travel speed | 39.6 km/h (24.6 mph), B/C-series, with 16F/4R Cat Powershift transmission |
| Primary working speed range | approximately 6.4-14.9 km/h (4-9.3 mph) across closely-spaced working gears |
| PTO speed | 1000 rpm, independent, 20-spline 45 mm (1.75 in) shaft, electronically controlled |
| 3-point hitch lift capacity | 7,257 kg (16,000 lb), Category 3/3N; optional steerable hitch carries the same rating with +/-8.6 degree swing |
| Drawbar | Standard fixed drawbar swings 9 degrees off centerline; optional wide-swing roller-type drawbar swings +/-32 degrees |
| Drawbar power, 2001-2006 tractors (tested) | 151.3 kW (202.94 hp) tested; up to 168.5 kW (226 hp) claimed |
| Steering | Electrohydraulic differential steering, speed-sensitive across the full travel range |
Service capacities (summary)
| Fuel tank, standard gauge | 446.7 L (118 US gal) on 60-88 in gauge tractors |
| Fuel tank, wide/ultra wide gauge | 673.8 L (178 US gal) on 80-160 in gauge tractors; an optional 787.4 L (208 US gal) tank is available on some configurations |
| Hydraulic system | Closed-center, pressure-flow compensated, load-independent flow division; maximum flow 164.7 L/min (43.5 gpm) at up to 200 bar (2,900 psi). 4 remotes standard, up to 6 optional |
| Engine oil and cooling system | Capacities are not documented in the factory literature reviewed for this model — confirm with a Cat or Challenger dealer, or the machine's service manual |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
MTC755 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 30 L (7.9 US gal); the standalone C9 engine spec sheet for this same block lists 32 L (8.5 US gal) - treat 30-32 L (7.9-8.5 gal) as the working range | API CI-4/CH-4 diesel engine oil. Viscosity by coldest expected start temperature: SAE 0W20 down to -40C (-40F); 0W30 -40 to 30C (-40 to 86F); 5W30 -30 to 30C (-22 to 86F); 5W40 -30 to 40C (-22 to 104F); 10W30 -20 to 40C (-4 to 104F); 15W40 -15 to 50C (5 to 122F). Use the highest viscosity the ambient temperature allows. |
| Cooling system | 43.3 L (11.4 US gal), full machine including radiator and hoses (engine block alone holds roughly 18 L / 4.8 gal of that total) | Water/antifreeze mix meeting ASTM D3306: 40-60% ethylene- or propylene-glycol antifreeze to 40-60% water, ideal ratio 50/50 - equivalent to a standard extended-life diesel engine coolant. |
| Fuel tank | Varies by configuration/series: roughly 413-447 L (109-118 US gal) on the standard-gauge tank; 640-787 L (169-208 US gal) on wide/ultra-wide dual modular tanks; an optional third modular tank adds about 114 L (30 US gal) more | Diesel fuel to DIN EN 590 spec: density 0.82-0.84 kg/L at 15C (59F), cetane index 51 minimum, sulfur under 0.005%, water under 200 mg/kg. |
| Hydraulic system, powershift transmission and differential-steering final drive (shared common sump) | Standard gauge 219 L (58 US gal); wide gauge 227 L (60 US gal); ultra-wide gauge 257 L (68 US gal). The implement-hydraulic circuit draws off this same common sump through a small elevated reservoir - no separate hydraulic-only tank figure is published | Factory drivetrain/hydraulic fluid, SAE 10W30, usable -25 to 40C (-13 to 104F) - equivalent in service to a heavy-duty TDTO-type powershift transmission and drive-train oil. |
| Front idler hub (each side) | 0.45 L (0.12 US gal) | TO-4 SAE 50 synthetic gear oil, usable -30 to 50C (-22 to 122F). |
| Midwheel hub (each, suspended midwheels) | 0.189 L (0.05 US gal) | TO-4 SAE 50 synthetic gear oil, usable -30 to 50C (-22 to 122F). |
| Drive wheel hub / final drive (each side) | 1.59 L (0.42 US gal) | TO-4 SAE 50 synthetic gear oil, usable -30 to 50C (-22 to 122F). Note: the Mobil-trac rubber-belt undercarriage itself carries no grease zerks and needs no routine lubrication. |
| Grease points (three-point hitch and quick-hitch pins) | Not itemized with a volume in the factory lubrication chart | General-purpose NLGI multipurpose chassis grease, applied at scheduled hitch and quick-hitch pin points. The tracked undercarriage is sealed and grease-free by design. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar MTC755 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 |
|
| Every 6,000 h |
|
Servicing the MTC755 beyond the schedule
Predictive Maintenance & Fluid Analysis
Run S·O·S oil sampling on the Cat 8.8 L HEUI engine, powershift transmission, and final drives every 250 hours; HEUI injection is unusually sensitive to fuel and oil contamination, so catching abrasive wear or coolant intrusion early avoids injector and pump damage. Track hydraulic oil cleanliness too, since the closed-center load-sensing system depends on tight tolerances. Watch coolant condition against the Cat ELC test schedule rather than a fixed date, and log final-drive oil analysis for metal counts that flag an early duo-cone seal failure before it becomes gear damage.
Corrective & Common Repairs
The recurring corrective job on these tractors is the final-drive axle-shaft seal: the original duo-cone face seal weeps with age and thermal cycling, contaminating gear oil and inviting bearing wear if ignored; many owners upgrade to the later cassette-style seal at rebuild. HEUI fuel systems punish contaminated fuel, so injector and high-pressure oil pump complaints trace back to a skipped water-separator drain or a delayed fuel filter change. Mid-roller bogies and front idler bearings are the other common wear-driven repair, especially on tractors run on hard or abrasive ground.
Overhaul & Rebuild Points
Plan undercarriage rebuilds around belt life first: Mobil-trac rubber belts, mid-roller wheels, and front idlers wear as a set, and replacing belts alone on badly worn rollers accelerates the next belt's wear. On the powertrain side, a high-hour HEUI engine rebuild should include the high-pressure oil pump and injectors together, since HEUI fuel and oil-actuation circuits are interlinked. Final-drive rebuilds are the point to convert from the original duo-cone seal to the later cassette design, closing off the tractor's most common leak path.
Seasonal & Environment Servicing
Cold starts on the Cat HEUI diesel benefit from a block heater and verified glow-plug/intake-heater function, since HEUI injection is more temperature-sensitive at startup than mechanical systems. Before winter storage, drain water separators and top off fuel to limit condensation. Rubber Mobil-trac belts stiffen in sub-freezing weather and are more prone to edge cracking, so avoid tight turns on hard, cold ground until belts warm up. In wet spring fieldwork, check mid-wheel bogies and final-drive breathers more often, since mud packing and standing water accelerate seal wear and mask leaks.
MTC755 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.
MTC755 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E100 | Engine oil pressure fault (cross-references SAE SPN 100) — ECM flags the oil pressure signal as outside normal range or rate of change. | Low oil level, worn oil pump, degraded oil, or a failing oil pressure sensor/wiring fault. | Check oil level and condition first, then confirm actual pressure with a mechanical gauge before condemning the sensor. |
| E110 | Engine coolant temperature fault (cross-references SAE SPN 110) — reported temperature is high or the sensor signal is invalid. | Low coolant level, blocked radiator or screen, weak fan drive, or a failed coolant temperature sensor. | Check coolant level and clear debris from the radiator and screens before inspecting sensor wiring. |
| E102 | Boost/intake manifold pressure fault (cross-references SAE SPN 102) — turbo boost reading is outside expected range. | Restricted air filter, a leak in the intake or charge-air piping, turbo wear, or a boost sensor fault. | Inspect the air filter and intake/charge-air hoses for restriction or leaks before replacing the sensor. |
| E168 | Battery/system voltage fault (cross-references SAE SPN 168) — charging voltage seen by the engine ECM is out of range. | Weak battery, loose or corroded terminal, or a failing alternator/charging circuit. | Check battery state of charge and terminal connections, then verify alternator output. |
| E190 | Engine speed signal fault (cross-references SAE SPN 190) — ECM loses a valid crankshaft speed signal. | Misadjusted or failed engine speed sensor, damaged wiring/connector, or debris on the timing wheel. | Check speed sensor air gap and wiring for damage before replacing the sensor. |
| E9131-E9136 | Individual cylinder injector circuit fault — the last digit identifies which injector (cylinder 1 through 6) the ECM flags as erratic, shorted, or open. | Faulty injector solenoid, damaged injector harness, or a corroded connector. | Isolate the flagged cylinder, inspect injector wiring and connector, then test injector response with the diagnostic tool before replacing the injector. |
| D130 | Battery voltage too low, reported by the instrument cluster/chassis controller (separate from the engine ECM's own voltage code). | Discharged battery, poor ground strap connection, or a charging system fault. | Test battery voltage and ground connections, then check alternator charging output. |
| D149-D150 | Loss of communication between control modules on the machine data-link. | Damaged data-link wiring, a poor connector contact, or a downstream module without power. | Check data-link wiring and connectors between modules and confirm all controllers have power before replacing any module. |
| D139-D143 / D156 | Clutch pedal position or clutch high/low point sensor fault in the transmission clutch calibration system. | Misadjusted or failed clutch pedal sensor, or a clutch high/low point sensor out of calibration. | Recalibrate the clutch pedal and high/low point sensors per the transmission calibration procedure; replace the sensor if calibration fails. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
MTC755 attachments & work tools
Three-point rear linkage (hitch)
Standard electronically controlled Category III three-point linkage at the rear, rated to lift roughly 7,257 kg (16,000 lb) and paired with integrated track slip control so it can engage under load. This is the primary mounting point for mounted implements on this tractor class.
Quick-hitch coupler
Category 3 quick-hitch couplers fit the rear linkage across the MT735-MT765 track-tractor family this model belongs to, letting one operator pick up mounted implements from the seat without leaving the cab. Not every individual machine left the factory with one fitted, so treat this as an option.
PTO
Independent, cab-engaged rear PTO running at 1000 rpm, the standard speed for implements in this horsepower class such as balers, forage gear, and PTO-driven pumps. No front PTO is offered on this platform.
Hydraulic remotes / SCVs
Standard hydraulic circuit runs four electronic spool valves, expandable to five or six on higher-spec builds, with electronic power-beyond so trailed implements with their own remote valves can run off the tractor's system. Pump flow falls around 165 L/min (43.5 US gpm) at up to roughly 200 bar (2,900 psi), and exact figures vary by configuration.
Drawbar
A swinging drawbar was standard equipment for towed implements and wagons, used alongside or instead of the three-point linkage. Some individual machines are instead fitted with a fixed drawbar, so this varies by configuration.
Undercarriage / track width options
Rubber belted tracks, not wheels, were offered in roughly 460 mm (18 in), 635 mm (25 in), and 760 mm (30 in) widths to suit soil type, flotation needs, and row spacing. The 635 mm (25 in) width is the one most commonly reported in the field.
Front ballast weights
Bolt-on ballast weights, in blocks of roughly 57 kg (125 lb) each, mount to the front track-frame idler ends to counter the tractor's natural front-heavy static balance (about 60/40 front-to-rear) when running heavy rear-mounted or trailed implements. Packages are built up from these blocks rather than sold as one fixed kit.
Auto-guidance / steering assist
A satellite-based auto-steer system, developed with an outside guidance-systems partner, was offered as a factory or dealer-retrofit option on MT700-series Challengers during this tractor's production window. Exact model-year availability varies, so confirm against the specific serial number.
All MTC755 assemblies by section
Every catalogued assembly group for the Caterpillar MTC755. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
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 |
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 |
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 |
206-2947 Turbocharger Gp
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 16***63 | Clamp | 2 |
| 17***20 | Hose; (Wastegate) | 1 |
191-5094 Turbocharger Gp
| 13***01 | Housing-Turbine | 1 |
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 19***94 | Turbocharger Group | 1 |
193-3346 Turbocharger Gp
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 16***63 | Clamp | 2 |
| 17***91 | Hose; (Wastegate) | 1 |
206-4013 Turbocharger Gp
| 1P***51 | Gasket; (Turbocharger) | 1 |
| 20***47 | Turbocharger Group | 1 |
| 20***13 | Turbocharger Group | 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 |
| 10***09 | Gear-Camshaft; (100-Teeth) | 1 |
| 16***00 | Camshaft Group | 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 |
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 |
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 |
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 |
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 |
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 |
161-3406 Cylinder Block Gp
| 0S***19 | Plug-Cup | 1 |
| 16***06 | Cylinder Block Group | 1 |
| 1W***07 | Sleeve | 2 |
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 |
161-3405 Cylinder Head Gp
| 16***05 | Cylinder Head Group | 1 |
| 16***71 | Fastener Group-Cylinder Head | 26 |
| 18***15 | Gasket Assem. | 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 |
210-5987 Cylinder Head Gp
| 16***71 | Fastener Group-Cylinder Head | 26 |
| 18***15 | Gasket Assem. | 1 |
| 21***84 | Cylinder Head Group | 1 |
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 |
169-3539 Damper & Pulley Gp
| 15***36 | Pulley-Crankshaft; (8-Groove) | 1 |
| 16***39 | Damper & Pulley Group | 1 |
| 20***19 | Damper As | 1 |
192-3833 Damper & Pulley Gp
| 15***36 | Pulley-Crankshaft; (8-Groove) | 1 |
| 16***21 | Damper Assem. | 1 |
| 19***33 | Damper & Pulley Group | 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 |
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 |
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 |
145-9112 Flywheel Gp
| 14***53 | Flywheel As | 1 |
| 14***12 | Flywheel Group | 1 |
| 4N***14 | Gear; (113-Teeth)(Flywheel Starter) | 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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
213-9321 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 |
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 |
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 |
171-4685 Support Gp-Engine
| 16***06 | Support-Rear | 1 |
| 17***85 | Support Group-Engine | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
185-5334 Support Gp-Engine
| 18***34 | Support Group-Engine; -Front | 1 |
| 20***44 | Support-Engine | 2 |
| 6V***44 | Bolt; (M16x2.0x35mm) | 4 |
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 |
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 |
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 |
208-0332 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 |
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 |
208-2385 Connection Gp-Electrical
| 10***29 | Stud; (M10x1.5-Thd) | 1 |
| 10***03 | Cap; (Stud Protector) | 1 |
| 20***85 | Connection Group-Electrical | 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 |
196-4173 Control Gp-Engine Electronic
| 19***72 | Control Group-Engine Electronic | 1 |
| 19***73 | Control Group-Engine Electronic | 1 |
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 |
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 |
130-9811 Sensor Gp-Temperature
| 13***11 | Sensor Group-Temperature; (Transmission Lubrication Oil) | 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 |
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
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 |
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 |
177-1414 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 |
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 |
177-1420 Engine Ar
| 10***36 | Starting Motor Group-Electric | 1 |
| 11***56 | Fastener Group-Front Housing; (Housing) | 1 |
| 11***94 | Fastener Group-Flywheel; (Flywheel) | 1 |
179-4954 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 |
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 |
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 |
179-4956 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 |
177-1417 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***06 | Cylinder Block 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 |
194-4161 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 |
177-1419 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 | 3 |
| 03***55 | Tee-Flared | 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 |
| 19***20 | Bolt-Socket Head; (M8x1.25x63-mm) | 2 |
| 21***70 | Injector Group-Fuel | 1 |
166-1759 Pump Gp-Unit Injection
| 16***59 | Pump Group-Unit Injection | 1 |
| 17***80 | Pump Group-Unit Injection | 6 |
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 |
204-4944 Pump Gp-Unit Injector Hyd
| 20***44 | Pump Group-Unit Injector Hydraulic | 1 |
Lubrication System
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 |
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 |
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 |
MTC755 serial number reference
On MT700-series Challenger track tractors the PIN/serial plate mounts to the main frame, low at the front left side of the chassis. The plate is one continuous 8-character stamp: the first 3 letters are the prefix identifying model and build series, and the trailing 5 digits are the sequential production number for that individual machine.
| Prefix | Identifies | Notes |
|---|---|---|
| ALM | Challenger MT755 track tractor (AGCO-built, Cat C9-powered) -- covers the original build run and the later "B" revision | Cat C9 turbocharged diesel, 8.8 L (537 cu in), inline 6-cylinder. Gross power is about 216 kW (290 hp) on the earlier build, rising to roughly 224 kW (301 hp) on the later revision. Same MT700-series track-tractor platform as the MT735, MT745 and MT765, but those take their own separate prefixes, not this one. A later "C"-series MT755C kept the same C9 engine, but no source ties a confirmed prefix to it -- if the plate doesn't read ALM, confirm the exact break with your dealer. |
Frequently asked questions
What engine powers the Caterpillar MTC755 (Challenger MT755)?
It depends on series. The original MT755 (2002-2004) used a pre-ACERT Caterpillar inline-six HEUI diesel of 8.8 L displacement, rated around 290 gross hp. The MT755B (2006-2008) and MT755C (2008 into the mid-2010s) carried the Tier 3 Cat C9 ACERT version of the same 8.8 L HEUI architecture, rated 301 gross hp with roughly 245 hp at the PTO.
What is the operating weight of the Caterpillar MTC755?
Operating weight runs roughly 13.4-15 t (29,500-33,000 lb) empty, depending on series and rear-axle/ballast configuration. The base MT755 sits near the low end of that range; later B/C-series tractors with heavier options run toward the top.
What replaced the Caterpillar MTC755?
AGCO carried the MT755 model number forward into D-series and E-series Challenger track tractors, but those later generations switched entirely to AGCO Power engines rather than Caterpillar diesels. The MTC755 designation itself covers only the Cat-engined base, B, and C generations built before that engine change.
What MTC755 owners discuss
What engine problems come up most on the MTC755, and does it matter which series you have?
This tractor carries two distinct engines depending on build year. Early machines (roughly 2001-2006) run a pre-ACERT Cat inline-six around 8.8 L. Later B/C-series machines (2006-2016) moved to the Tier 3 Cat C9 ACERT, also near 8.8 L displacement but with revised electronics and a HEUI (hydraulically actuated electronic unit injector) fuel system. HEUI injectors and the injection pump are unforgiving of dirty fuel or water in the tank - injector wear traces back to fuel quality far more often than to a weak component. Ring and liner wear shows up on high-hour, hard-working units and usually ties to soot loading from extended idling or stretched oil change intervals rather than a design flaw. Run clean fuel, stay on the recommended oil interval, and treat any injector fault as a fuel-quality question first.
How does the powershift transmission behave, and what wears out first?
The MTC755 uses a Cat/AGCO powershift, not a foot-clutch transmission. The inching pedal is for creep-speed spotting only - using it like a clutch accelerates clutch-pack wear. Shifts stay smooth between clutch-pack services; a tractor that feels stuck in one gear while the shifter display shows another position more often has the shift linkage jumped off its rail than a failed transmission. Clutch packs eventually need servicing on high-hour machines, in line with other major driveline wear items, not as an early-life problem.
The brakes and steering both run off the same hydraulic system - what should I know?
Yes. The MTC755 uses implement hydraulic pressure to charge a brake accumulator, and a brake control valve meters that stored pressure to the service brakes. A fully charged accumulator holds enough pressure for several full brake applications even with the implement hydraulics idle, but a brake accumulator fault, or a pedal that goes soft or long, means the accumulator isn't charging or holding pressure. Steering complaints - pulling, slow response, or a no-steering-output fault - usually trace back to steering pump case-drain flow or system pressure rather than the steering valve itself. Because this shares plumbing with the service brakes, have your dealer verify accumulator charge and full brake function before trusting a used machine's brakes.
What wears out on the Mobil-trac undercarriage, and how long should it last?
Mid-rollers (bogie wheels) and front idler wheels are the routine wear items. Check their hub oil level regularly, more often in wet or muddy conditions, since a slow hub seal weep is common there. The rubber belts show a wide range of life depending on surface: road travel is much harder on the belt and undercarriage than field work, and rotating belts periodically on road-heavy machines evens out lug wear and extends belt life meaningfully. Owners report belt life anywhere from about 1000 hours on machines run hard on pavement, showing cracking and lug separation, up to several thousand hours on field-only machines - it varies by use and surface, not just age. The reaction arm bearing at the rear of the undercarriage frame is a bigger job; some owners get on the order of 7000 hours from the original bearing, and replacement is specialized work best left to a shop with the right tooling.
Is the rear axle or final drive seal leak a real issue on this tractor?
Yes. On A/B/C-series machines in this family, the final drive axle shaft seal is a duo-cone design that is a known source of slow weeps at the final drive. The factory addressed it on the later D-series with a cassette-style seal, and a machining procedure exists to update older A/B/C-series final drive housings to the newer seal. If a final drive isn't actively leaking, most shops just replace the original duo-cone seal rather than machine the housing - save the cassette conversion for a final drive that's already apart or leaking repeatedly.
What electrical or sensor faults show up most on the MTC755?
Fault history on these tractors leans toward sensors rather than wiring damage: clutch high-point and low-point sensors, the transmission filter-restriction and temperature sensors, and the armrest control lever's potentiometer are the recurring culprits, along with general communication faults between control modules. Separately, keep the cab HVAC condensate drain clear. If it plugs, water backs up near the electronics bay, and the control modules do not tolerate moisture intrusion well. A display that shows the tractor in gear when it won't move can be a genuine driveline fault, but check the neutral/park interlock switch and its sensor first - that's a common false trigger.
What should I check before buying a used MTC755?
Confirm which series and engine it carries - pre-ACERT or C9 ACERT - since parts, emissions equipment, and resale value differ between them. Pull the fault code history if the seller can access it; a stored brake accumulator fault or repeated engine codes are worth pricing into the deal. Walk the undercarriage: check mid-roller and idler hub oil for water intrusion, look for belt cracking or lug separation, and check for play in the reaction arm bearing. Look underneath for weeping at the final drive axle seals. Confirm the PTO engages cleanly and the tractor drives away under its own power in every gear - a tractor that shows in gear on the display but won't move is a real red flag some buyers have run into, not just a rumor. Have your dealer verify brake accumulator charge and full brake function as part of any pre-purchase inspection since this system is safety-critical and shouldn't be judged from a short test drive alone.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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