Caterpillarchallenger
Caterpillar MT745
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar/Challenger MT745 is a rubber-track (Mobile-trac) row-crop tractor in the 190-201 kW (255-270 hp) engine class, built at AGCO's Jackson, Minnesota plant across two generations from 2002 to 2008. The original MT745 (2002-2004) runs a Cat 8.8 L (537 cu in) six-cylinder diesel rated about 190 kW (255 hp) gross. The MT745B (2005-2008) moves to a Cat C9 ACERT Tier 3 engine with HEUI fuel injection and ADEM4 electronic control, rated about 201 kW (269 hp) gross. Operating weight runs roughly 12,789-14,095 kg (28,195-31,075 lb) depending on generation and configuration, climbing to about 16,329 kg (36,000 lb) fully ballasted. Both generations pair a Cat electronically controlled 16-forward/4-reverse powershift transmission, with an optional 4:1 creeper, to a Category III three-point hitch, an independent 1000 rpm rear PTO, and closed-center load-sensing hydraulics. Buyers could spec standard, wide, or ultra-wide track gauge and a range of belt widths, plus options such as a steerable hitch, a heavy-duty or wide-swing drawbar, and a high-flow hydraulic pump.
The jump from MT745 to MT745B centers on the engine swap: the C9 ACERT replaces the 8.8 L base engine, adds about 11 kW (14 hp) of gross output, and brings Tier 3 emissions compliance through ACERT combustion control rather than an EGR system, while keeping the same HEUI fuel architecture and Mobile-trac undercarriage layout. AGCO's parts and service literature for the platform references a later MT745C alongside the 755C and 765C siblings, but published specifications and serial-number records for it are sparse next to the well-documented MT745 and MT745B. Most of the used-equipment population and parts demand for this nameplate sits on the MT745 and MT745B built between 2002 and 2008.
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 MT745 specifications
Engine
| Engine (original MT745, 2002-2004) | Caterpillar 8.8 L (537 cu in) turbocharged 6-cylinder diesel, liquid-cooled, 12:1 compression range noted in period literature; rated 2,100 rpm |
| Gross power (original MT745) | 255 hp (190 kW) |
| Engine (MT745B, 2005-2008 / MT745C, 2008-2016) | Caterpillar C9 ACERT Tier 3, in-line liquid-cooled diesel, turbocharged with air-to-air aftercooling |
| Gross engine power (MT745B) | 269 hp (201 kW), manufacturer's estimate maximum power at approximately 1,800 rpm |
| PTO power (MT745B/MT745C) | 225 hp (168 kW) at rated 2,100 rpm |
| Gross engine power (MT745C) | Reported between 269 hp (201 kW) and roughly 290 hp (216 kW) depending on source; factory literature confirming a C-series-specific uprate over the 745B figure was not located, so treat the higher figure as unconfirmed and 269 hp (201 kW) as the more consistent value |
| Displacement / cylinders | 537 cu in (8.8 L), 6 cylinders, 24 valves (4 per cylinder) |
| Torque rise | 42% engine torque rise, 52% PTO torque rise (B/C series); peak torque reached near 1,400 rpm |
| Fuel system | Hydraulic electronic unit injectors (HEUI) with full electronic (ADEM 4) engine control |
| Emissions tier | Tier 3 on the B and C series via ACERT combustion control (no EGR); tier not documented in available literature for the original pre-B-series MT745 |
Weights
| Approx. shipping weight (MT745B / MT745C) | 31,075 lb (14,095 kg) |
| Operating weight (original MT745, 2002-2004) | approx. 28,195 lb (12,789 kg) |
| Maximum operating weight, fully ballasted (C-series platform) | up to 36,000 lb (16,329 kg) with front suitcase and idler ballast added |
| Ground pressure | Not published in available factory or dealer literature |
Dimensions
| Overall length | 233 in (5,917 mm) — B/C series |
| Overall width (wide-gauge setting) | 133 in (3,376 mm); actual overall width changes with the selected track gauge — see gauge ranges below |
| Height to top of cab | 135.5 in (3,444 mm) |
| Wheelbase | 96 in (2,438 mm), the longest in its power class per factory literature, spread across a 5-axle undercarriage |
| Drawbar / ground clearance | 14.3 in (365 mm) |
| Track gauge (bar-axle) options | Standard 60-88 in (1,524-2,235 mm); Wide 80-120 in (2,032-3,048 mm); Ultra Wide 120-160 in (3,048-4,064 mm), infinitely adjustable within each range without detensioning the belt |
| Belt (track) width options | 14-30 in (355-760 mm) depending on belt type and series — General Ag, Low-Profile, and Extreme Application belts offered in different width subsets |
Performance
| Maximum travel speed | 24.6 mph (39.6 km/h), cited as the highest transport speed in its class in factory literature |
| Transmission | Cat electronically controlled powershift, 16 forward / 4 reverse, with optional 4:1 creeper reduction |
| PTO | Independent, electronically controlled, 1,000 rpm, 20-spline 1.75 in (45 mm) shaft |
| 3-point hitch lift capacity | 16,000 lb (7,257 kg), Category 3/3N; optional steerable hitch adds +/-8.6-degree side swing and can improve turning radius up to 60% |
| Standard drawbar capacity | 10,000 lb (4,536 kg) vertical load rating (C series); optional heavy-duty drawbar rated to 12,000 lb (5,443 kg); optional wide-swing drawbar allows +/-32-degree swing |
| Tested drawbar/PTO performance (original MT745) | Claimed 197 hp drawbar / 205 hp PTO; independently tested at 177.67 hp drawbar / 236.19 hp PTO |
| Gradeability | Not published in available factory or dealer literature |
Service capacities (summary)
| Fuel tank | Standard (60-88 in gauge) 118 US gal (446.7 L); Wide/Ultra Wide gauge 178 US gal (673.8 L); optional maximum tank 208 US gal (787.4 L), not available on all configurations |
| Hydraulic system flow | Standard pump 43.5 US gpm (164.7 L/min) at up to 2,900 psi (200 bar); optional high-flow pump 59 US gpm (224.2 L/min) offered on the C series |
| Hydraulic reservoir capacity | Not published in available factory literature |
| Engine oil capacity | Not documented specifically for this tractor's engine installation in available literature; capacity differs by sump configuration, so check the tractor's own operation and maintenance manual rather than generic C9 truck-engine figures |
| Cooling system capacity | Not published in available factory literature |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
MT745 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | approx. 30 L (7.9 US gal) — figure documented at the MT735-765 platform level, not broken out separately for the MT745; confirm against your unit's OMM | Heavy-duty diesel engine oil meeting API CI-4/CH-4 and ACEA E3/E5 performance for the Cat-built engine. SAE 15W-40 for general and warm-climate service; SAE 10W-30 multigrade for cold-start climates, per the OMM ambient-temperature chart |
| Cooling system | not documented in available sourcing for this model — confirm against your unit's OMM | Extended-life ethylene-glycol coolant, factory 50/50 premix rated to roughly -37 C (-35 F); heavier concentrate blend available for extreme cold per the OMM temperature chart |
| Fuel tank | 446.6 L (118 US gal) on narrow-gauge configuration; 673.7 L (178 US gal) on wide-gauge configuration; 787.3 L (208 US gal) with the optional long-range tank — varies by configuration | No. 2-D ultra-low-sulfur diesel meeting the engine fuel-quality spec; No. 1-D blend permitted in cold weather per the OMM |
| Transmission / powertrain compartment | not broken out separately from the hydraulic system in available sourcing for this platform — confirm against your unit's OMM | TO-4-type powershift transmission-hydraulic fluid; this platform typically shares one fluid family across transmission and hydraulics |
| Final drives (each side) | not documented in available sourcing; this is a rubber-track (Mobile-trac) platform with final drives at each sprocket, no axle differentials | TO-4-type final-drive gear oil per the OMM viscosity chart |
| Hydraulic system and tank | approx. 182 L (48 US gal) — figure documented at the MT735-765 platform level, not broken out separately for the MT745; confirm against your unit's OMM. Rated implement-hydraulic flow is about 165 L/min (43.5 US gpm) at 200 bar (2900 psi) | TO-4-type hydraulic-transmission fluid, same family as the powershift transmission fill |
| Grease (all points, spec only) | spec only — no fill volume | NLGI 2 lithium-complex EP multipurpose grease for track rollers, idlers, and chassis pivot points; shorten intervals in wet or muddy conditions per the OMM |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar MT745 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the MT745 beyond the schedule
Predictive Maintenance & Fluid Analysis
Track engine oil analysis for rising iron content on both engines. It is the earliest warning of HEUI pump thrust-bearing wear, especially on the original 8.8 L engine after steep-ground work. Trend transmission and hydraulic TO-4 fluid cleanliness between changes; frequent implement swaps introduce dirt and moisture faster than single-attachment use. Monitor track tension and mid-roller temperature after road travel, since heat cycling drives the rubber-to-steel bond failure that starts at the roller edges. Recalibrate the powershift through dealer software after every fluid change.
Corrective & Common Repairs
Final drive bearing wear is the most common driveline repair on both generations, since the narrow early-design housing crowds the main bearings; check bearing play and listen for driveline noise before heavy pull work. Mid-roller rubber often debonds from the steel wheel center at the outer edge first, chewing into track guide lugs if it isn't caught. Powershift clutch packs wear early when operators slip the inching pedal under load instead of shifting properly. Trace AC cycling complaints to the low-pressure switch before condemning the compressor.
Overhaul & Rebuild Points
Final drive housings on both generations need bearing and race replacement once play exceeds factory limits; rebuild the narrower early-design housing as a full set rather than swapping a single bearing. Overhaul HEUI injectors and the high-pressure oil pump across both engines once actuation-pressure trends drift, since pump wear rarely shows up as a sudden failure. Rebuild powershift clutch packs at high hours if inching-pedal habits went uncorrected. A full undercarriage rebuild (mid-rollers, idlers, and track belts) follows once rubber debonding spreads past the roller edges.
Seasonal & Environment Servicing
Switch engine oil viscosity between the warm-weather 15W-40 grade and the cold-start 10W-30 grade as ambient temperature swings, per the OMM chart. Recheck track tension after temperature changes, since rubber belt geometry shifts with heat and cold. On road-heavy summer work, watch mid-roller temperature, since friction-driven heat is what debonds the rubber face from the steel center; polyurethane mid-rollers cut that heat buildup where road travel is frequent. In wet or muddy conditions, clear packed debris from the tri-bogie mid-roller area and shorten grease intervals.
MT745 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.
MT745 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 100-01 | Engine oil pressure below the normal operating range as read by the ECM. | Low oil level, a plugged oil filter, a worn oil pump, or a failed oil pressure sensor or its wiring. | Shut the engine down immediately, check oil level and filter condition, then confirm sensor readings with Cat ET before restart. |
| 110-00 | Engine coolant temperature reading above the normal operating range. | Low coolant level, a plugged radiator or air-to-air cooler, a stuck thermostat, or a slipping or damaged fan drive. | Shut down and let the engine cool, check coolant level and clean the radiator core, then verify the reading against a second sensor or Cat ET. |
| 164-02 | Injection actuation pressure (HEUI high-pressure oil circuit) signal erratic, with desired and actual pressure not matching. | A worn HEUI pump, a leaking injector, a faulty injection actuation pressure sensor, or low or aerated engine oil feeding the high-pressure pump. | Check engine oil level and condition first, then verify actuation pressure at the test port with a calibrated gauge before replacing the pump. |
| 190-08 | Primary engine speed and timing sensor signal has an abnormal frequency or pulse pattern. | Incorrect sensor-to-tone-wheel air gap, a chipped tone-wheel tooth, or a corroded or loose sensor connector. | Check and reset the sensor air gap with a feeler gauge, inspect the connector, and clear the code before replacing the sensor. |
| 342-08 | Secondary engine speed and timing sensor signal has an abnormal frequency or pulse pattern. | Same root causes as the primary sensor circuit — a bad air gap, damaged tone wheel, or a wiring or connector fault — since the ECM cross-checks both signals. | Inspect wiring and the connector, verify the air gap, and compare the reading against the primary speed sensor with Cat ET. |
| 41-04 | 8-volt sensor reference supply reading below normal, indicating a short to ground on the shared reference circuit. | A chafed harness, moisture at a sensor connector, or an internally shorted sensor fed from the 8-volt supply. | Disconnect sensors on the 8-volt circuit one at a time to isolate the short rather than replacing sensors at random; expect this code to trigger several other codes at once. |
| 102-04 | Boost/intake manifold pressure sensor circuit shorted to ground. | Damaged sensor wiring, a corroded connector, or a failed boost pressure sensor. | Inspect the sensor harness and connector for damage, then confirm the fault with Cat ET before replacing the sensor. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
MT745 attachments & work tools
Three-point hitch / rear linkage
An electronically controlled Category III three-point linkage is standard, with a rated rear lift capacity around 7,257 kg (16,000 lb). Draft control integrates with the undercarriage track-slip management so implement depth holds steady on tracked ground.
Rear PTO
An independent rear PTO runs at 1000 rpm, standard across this tractor platform. Large-frame splined output shafts typical of this horsepower class are fitted; confirm the exact spline count for the specific build.
Swinging drawbar
A swinging clevis-pin drawbar is standard equipment for pull-type tillage tools, planters, grain carts, and sprayers. It can be offset for alignment with towed implements behind the tracked undercarriage.
Hydraulic remote valves
A closed-center, load-sensing two-pump hydraulic system supplies remote valves for mounted and semi-mounted implements; four valves are standard with factory kits available to add a fifth or sixth depending on hitch configuration. System pressure runs around 200 bar (2900 psi); reported total flow varies by source/generation, roughly 136-205 L/min (36-54 gpm).
Quick-hitch coupler
A quick-hitch coupler for the rear three-point linkage is offered across this size class of tractor, letting mounted implements be picked up and released without manually aligning lift-arm pins.
Rubber-track undercarriage width
The machine rides on a rubber-belt undercarriage rather than tires. Belts are offered in multiple widths for this class, roughly 457-762 mm (18-30 in), chosen for flotation or row-crop clearance, with a tri-bogie mid-roller arrangement keeping the belt in ground contact over uneven fields.
Front ballast weights
Front track-frame/idler ballast weights are available to rebalance the tractor when running heavy mounted rear implements. Exact weight-per-unit and maximum stack counts vary by generation/series -- verify with a dealer for the specific configuration.
Integrated hitch and slip-control electronics
Factory electronics link three-point draft control to the track-slip monitoring system, trimming linkage response to hold optimum slip while pulling mounted or semi-mounted implements. PTO, hitch, and remote-valve controls are grouped on a color-coded armrest console.
All MT745 assemblies by section
Every catalogued assembly group for the Caterpillar MT745. 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 |
165-4444 Manifold Gp-Exhaust
| 11***15 | Stud-Taperlock; (M10x85-mm Oal) | 12 |
| 16***98 | Manifold-Exhaust | 1 |
| 16***11 | Gasket | 6 |
171-4687 Manifold Gp-Exhaust
| 11***15 | Stud-Taperlock; (M10x85-mm Oal) | 12 |
| 16***98 | Manifold-Exhaust | 2 |
| 16***11 | Gasket | 6 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
210-5985 Cylinder Head As
| 17***88 | Seat-Valve | 12 |
| 17***90 | Seat-Valve | 12 |
| 21***85 | Cylinder Head As | 1 |
201-2180 Cylinder Head As
| 17***88 | Seat-Valve | 12 |
| 17***90 | Seat-Valve | 12 |
| 17***37 | Sleeve-Injector | 6 |
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 |
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 |
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 |
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 |
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 |
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 |
213-9320 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 |
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 |
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 |
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 |
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 |
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 |
165-4461 Lines Gp-Water
| 14***11 | Plug Group | 2 |
| 16***61 | Lines Group-Water; -Water Temperature Regulator | 1 |
| 16***24 | Hose | 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 |
208-0332 Pump Gp-Water
| 14***88 | Seal As; (Water Pump) | 1 |
| 17***44 | Cover | 1 |
| 17***52 | Shaft As | 1 |
187-8982 Pump Gp-Water
| 06***69 | Stem | 1 |
| 14***88 | Seal As; (Water Pump) | 1 |
| 17***44 | Cover | 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 |
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 |
180-6004 Connection Gp-Electrical
| 10***29 | Stud; (M10x1.5-Thd) | 1 |
| 10***03 | Cap; (Stud Protector) | 1 |
| 18***04 | 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 |
208-2385 Connection Gp-Electrical
| 10***29 | Stud; (M10x1.5-Thd) | 1 |
| 10***03 | Cap; (Stud Protector) | 1 |
| 20***85 | 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 |
101-8936 Starting Motor Gp-Electric
| 10***36 | Starting Motor Group-Electric | 1 |
| 15***25 | Gasket | 1 |
| 20***24 | Starting Motor Group-Electric | 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 |
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 |
188-9869 Wiring Gp-Electronic Control
| 00***35 | Protector | 1 |
| 01***80 | Lockwasher | 2 |
| 10***20 | Plug As-Connector; (2-Pin) | 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 |
Engine Arrangement
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 |
179-4956 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 |
177-1418 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 |
179-4958 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 |
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 |
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 |
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 |
177-1415 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 |
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 |
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
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 |
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 |
187-3077 Fumes Disposal Gp
| 18***77 | Fumes Disposal Group | 1 |
| 19***31 | Bracket | 1 |
| 19***10 | Hose-Fumes Disposal | 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 |
MT745 serial number reference
The ID plate is a small metal tag riveted to the main tractor frame on the front left side; it carries the full product identification number. Read the first three letters as the plant/model-line prefix (ALA for this line) and the digits after as a running production sequence — in early MT745 production that sequence roughly tracks build year (20000s for 2002 through 40000s for 2004), then continues upward into the 60000s once the B-series update starts in 2005.
| Prefix | Identifies | Notes |
|---|---|---|
| ALA | MT745 (2002-2004, first-generation MT700 series rubber-track tractor) | Base MT745, rated about 255 hp gross (190 kW), 8.8 L (537 cu in) Caterpillar C9 six-cylinder diesel. Sequence numbering tracks close to build year in this run: low-20000s for 2002, low-30000s for 2003, low-40000s for 2004, and factory parts documentation shows the range continuing up toward the high-50000s before the next update. Built at the Jackson, Minnesota assembly plant. |
| ALA | MT745B (2005-2008, first update within the MT700 series) | Power rises to about 269 hp gross (201 kW) on the same 8.8 L (537 cu in) Caterpillar C9 six-cylinder diesel (non-ACERT). Factory parts documentation carries the same ALA prefix forward for this update, with the B-series break starting near the 60000 sequence mark and running up from there. Same Jackson, Minnesota plant as the base MT745. |
Frequently asked questions
What engine powers the Caterpillar MT745?
It depends on the generation. The original MT745 (2002-2004) uses a Cat 8.8 L (537 cu in) turbocharged six-cylinder diesel rated about 190 kW (255 hp) gross. The MT745B (2005-2008) switches to a Cat C9 ACERT Tier 3 engine with HEUI fuel injection and ADEM4 electronic control, rated about 201 kW (269 hp) gross, with PTO power around 168 kW (225 hp).
What is the MT745's operating weight?
Operating weight runs roughly 12,789-14,095 kg (28,195-31,075 lb) depending on generation and track/ballast configuration. Fully ballasted with front suitcase and idler weights added, the tractor can reach about 16,329 kg (36,000 lb).
What replaced the Caterpillar MT745?
AGCO's factory parts and service documentation references a later MT745C on the same platform, but detailed specifications and serial records for it are not well documented publicly, unlike the thoroughly verified MT745 (2002-2004) and MT745B (2005-2008). For most buyers and parts searches, the MT745B remains the newest well-documented tractor carrying this badge; confirm any later-dated unit's exact configuration with your dealer.
What MT745 owners discuss
What's the most consistently flagged mechanical weak point on early MT745 and MT745B tractors?
Final drive bearing wear. On the first-generation final drive design, the two main bearings on each side sit close together, so they carry more load than the geometry really allows. Owners running heavy linkage-mounted implements report bearing breakup here more than on any other driveline component. Later revisions widen the final drive housing to give the bearings more room, but the MT745 and MT745B both use the earlier, narrower design. Check final drive bearing play and listen for driveline noise before buying. Have your dealer verify bearing condition before putting the tractor to heavy pull work.
How do the two MT745 generations differ under the hood, and does either have a known engine quirk?
The original MT745 (2002-2004) runs a Cat 8.8 L (537 cu in) HEUI-injected diesel rated around 190 kW (255 hp) gross. The MT745B (2005-2008) moves to a Cat C9 ACERT Tier 3 diesel rated around 201 kW (269 hp) gross. Both predate DPF-equipped emissions tiers, so neither carries the after-treatment complexity that shows up on later Cat C9 applications in other industries - don't assume those problems apply here. On the earlier 8.8 L engine, the HEUI pump's thrust bearing is the item worth tracking; periodic oil sampling for rising iron content catches wear before it fails outright, and some owners run the oil level slightly above full when working steep ground, since one documented pump failure at low hours was tied to steep-slope operation. Have your dealer verify HEUI pump health if an oil analysis trend looks abnormal.
What undercarriage wear pattern comes up most for this rubber-track platform?
Mid-roller (bogie wheel) rubber debonding. Heat cycling from road travel and field work breaks down the bond between the steel wheel center and its rubber wear face, usually starting at the outer edges before spreading across the whole roller. A debonded mid-roller can chew into the track's guide lugs and expose the internal cables if it isn't caught. Keeping the tri-bogie mid-wheel area free of packed stones and debris, and holding correct track tension, are the two habits owners credit most for slowing this wear. Some switch to polyurethane mid-rollers on road-heavy machines to cut the friction-driven heat that causes debonding in the first place.
Anything to know about how the powershift transmission behaves day to day?
The Cat-sourced full powershift used across this tractor family is considered a durable, over-built unit when serviced on schedule. The consensus maintenance points are changing transmission oil at the specified interval (roughly every 1,000 hours) and recalibrating through dealer software after every oil change. The other habit worth breaking: repeatedly slipping the inching pedal to modulate under load wears the clutch packs faster than normal shifting does, so use it for starts and stops, not as a substitute for proper gear selection.
What electrical or sensor fault shows up in real owner reports?
Air conditioning that cools fine at idle in the shop but starts rapid-cycling once out working - low side reading too low, high side climbing - points to the low-pressure cycling switch, not the compressor or core. One owner had already replaced the compressor, accumulator, orifice tube, condenser, and evaporator before tracing the fault to a misadjusted or failed cycling switch on a CCOT-style system. Worth checking the switch and its sensor circuit before condemning larger AC components.
What hydraulic-system behavior should owners watch for?
Most hydraulic pump complaints on this platform trace back to contaminated oil rather than a bad pump - tractors that see frequent implement changes pick up dirt and moisture in the circuit faster than machines running one attachment all season. Keeping filters current and topping off with clean fluid matters more than any single component swap. On the undercarriage side, the rear drive reaction arm holds only a small volume of full-synthetic gear oil across its two main bearings; owners who change it on a roughly 400-hour interval report avoiding bearing issues there, and front/rear idler bearing oil is worth checking regularly since even a small seal leak drains the cavity quickly. Because hydraulic faults can affect lift-arm and steering response, have your dealer verify any error code or slow-response complaint before returning the tractor to heavy work.
What should a buyer check before purchasing a used MT745 or MT745B?
Start with the final drive bearings on both sides - the narrower early-design housing is this platform's best-known weak point, especially on tractors that pulled heavy mounted implements. Check track condition and remaining lug depth, confirm mid-rollers aren't showing rubber separation at the edges, and ask for transmission and hydraulic oil-change records, since both fluids need changing and recalibration on schedule to avoid accelerated wear. Pull an engine oil sample if possible to screen for rising iron that would flag HEUI pump wear on the earlier 8.8 L engine. Confirm the AC and electrical systems cycle normally under load, not just at idle. Given how many of these checks touch driveline and safety-relevant components, have your dealer verify final drive, track, and hydraulic condition on a pre-purchase inspection rather than relying on a walk-around alone.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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