Caterpillarchallenger
Caterpillar MTC745
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar MTC745 is Caterpillar's own parts-catalog code for the AGCO-built Challenger MT745, a rubber-belted (Mobil-Trac) high-horsepower agricultural tractor sold under both the Caterpillar Challenger and AGCO Challenger names. It sits in the large four-wheel-drive-class tracked tractor segment, built for high-draft tillage, planting, and seeding work where steel wheels would compact soil. Three generations carry the 745 designation. The original MT745 (2002-2004) uses a Cat C-9 8.8-liter turbo diesel rated near 190 kW (255 hp) gross with an operating weight around 12.8 tonnes (28,195 lb). The MT745B update (roughly 2005/2006 through 2008) moves to a Tier 3 Cat C9 ACERT rated near 200 kW (269 hp) gross at about 14.1 tonnes (31,075 lb). The MT745C (2008/2009-2016), part of the MT700C series alongside the 755C and 765C, keeps the same C9 ACERT block but adds full ADEM electronic engine control at a similar 200 kW (269 hp) rating, with an operating weight reported in the roughly 14.7-15 tonne range depending on ballast and configuration. All three generations ride on the Mobil-Trac rubber-belt undercarriage rather than wheels or steel tracks, and share a 16-speed full-powershift transmission, closed-center load-sensing hydraulics, and a choice of narrow or wide rear-axle and fuel-tank configurations for row-crop or wide-frame work.
Caterpillar sold the Challenger line to AGCO in 2002 but kept building and supporting the C9 engine that powers it, so machines built after the sale still carry a genuine Cat powerplant under an AGCO nameplate. That is the single biggest identity quirk buyers run into with this model. Across the three 745 generations the core architecture barely changed: same displacement, same Mobil-Trac layout, same shared UTTO-spec fluid across transmission, hydraulics, and final drives. What changed generation to generation was engine control and emissions compliance, moving from mechanical/early-electronic injection to full ACERT with ADEM management, plus incremental weight and ballast increases. In the used and parts market the MTC745 sits in a useful niche: cheaper horsepower on rubber belts for buyers who do not need the size or fuel capacity of a 755C or 765C, but its engine, transmission, and hydraulic parts overlap heavily with its bigger MT700C-series siblings and with other Cat C9-powered equipment, which keeps parts support alive well past AGCO's discontinuation of the C-series lineup around 2016. Mobil-Trac belt wear and the shared powershift clutch packs remain the biggest recurring cost drivers for anyone buying one of these used.
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 MTC745 specifications
Engine
| Engine, original series (introduced 2002) | Caterpillar C9, 8.8 L (537 cu in), 6-cylinder turbocharged diesel, air-to-air aftercooled, HEUI fuel system |
| Gross power, original series | 190 kW (255 hp) at 2,100 rpm |
| Tested PTO / drawbar power, original series | PTO 176 kW (236 hp); drawbar 132 kW (178 hp) |
| Engine, C-series (MT745C, from 2008) | Caterpillar C9 ACERT, Tier III certified, same 8.8 L (538 cu in) block, 6 cylinders / 24 valves, turbocharged and air-to-air aftercooled |
| Rated power, C-series | 200-201 kW (269 hp) at 2,200 rpm |
| Peak power, C-series | 216 kW (290 hp) at 1,850 rpm under torque-rise |
| Peak torque, C-series | 1,337 Nm at 1,400 rpm; torque rise about 42% at the engine, 52% at the PTO |
| Bore and stroke | 112 x 149 mm (4.41 x 5.87 in), C9 block family |
| Fuel system | Hydraulic Electronic Unit Injection (HEUI); C-series adds ADEM 4 full-electronic control with multiple injections per combustion cycle |
| PTO power, C-series (secondary source) | Individual machine spec sheets list approximately 168 kW (225 hp); not itemized in the manufacturer series brochure |
| Emissions, original series | Not documented in available literature for the pre-2007 build |
Weights
| Operating weight, original series (2002-2004) | approximately 12,789 kg (28,195 lb) |
| Approx. shipping weight, C-series/MT700C shared chassis | 14,095 kg (31,075 lb); some listings round the MT745C to approximately 15 tonnes |
| Maximum operating weight with full ballast, C-series/MT700C | up to 16,329 kg (36,000 lb) |
| Ground pressure | Not published in available literature for this model |
Dimensions
| Wheelbase (Mobil-Trac undercarriage) | 2,438 mm (96 in); cited as approximately 2,400 mm in some regional literature |
| Overall length | 5,917 mm (233 in), shared MT700C-series chassis figure |
| Overall width, wide-gauge setting | 3,376 mm (133 in); narrows to about 2,790 mm (110 in) on standard-gauge/narrow-belt setups |
| Overall height to top of cab | 3,444 mm (135.5 in); transport height reported around 3,590 mm (141 in) on some configurations |
| Drawbar clearance | 365 mm (14.3 in) |
| Track gauge, adjustable range | Standard 1,524-2,235 mm (60-88 in); Wide 2,032-3,048 mm (80-120 in); Ultra-wide 3,048-4,064 mm (120-160 in) |
| Belt (track) width offered on the 745C | 635 mm and 762 mm (25 in and 30 in); wider MT700C-series range spans 356-762 mm (14-30 in) depending on belt type and model |
Performance
| Maximum transport speed | 40 km/h (24.6 mph) |
| Primary field working range | 6.5-14.9 km/h (4.0-9.3 mph) across 8 closely spaced gears |
| Transmission | 16 forward / 4 reverse electronically controlled powershift |
| Optional creeper transmission | Adds a 1:4 reduction (effectively 30F/8R), with speeds down to about 0.67 km/h (0.4 mph) |
| Torque rise, C-series | approximately 42% at the engine, 52% at the PTO |
| Independent PTO | 1,000 rpm, electronically controlled |
| 3-point hitch lift capacity | documented as approximately 7,260 kg (16,000 lb) on North American spec sheets, and as high as roughly 11,785 kg measured at link ends on international literature; figure varies by market and measurement point |
| Drawbar pull rating | Standard 4,536 kg (10,000 lb); optional heavy-duty drawbar rated to 5,443 kg (12,000 lb) |
| Gradeability | Not published for this model |
Service capacities (summary)
| Fuel tank, standard | 447 L (118 US gal) |
| Fuel tank, optional | up to 787 L (208 US gal) in North American configuration; 526 L (139 US gal) in some international configurations |
| Hydraulic system flow, standard pump | 164.7 L/min (43.5 US gpm) |
| Hydraulic system flow, optional high-flow pump | approximately 223-224 L/min (59 US gpm) |
| Hydraulic system maximum pressure | 200 bar (2,900 psi) |
| Engine oil and cooling system capacities | Not published in available literature for this model; confirm with a dealer for exact service fill volumes |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
MTC745 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not published for the original MT745 (2002-2004, Cat C9 8.8 L / 537 cu in 6-cylinder). The later, larger-rated MT745C (2008 on, Cat C9 ACERT, 200-201 kW) lists 30 L (7.9 US gal) for the crankcase-and-filter fill; treat as reference only, not the original-series figure. | Diesel engine oil meeting API CI-4 (later builds CH-4). Grade is set by ambient temperature: SAE 0W-20 or 0W-30 synthetic for the coldest starts down near -40 C (-40 F), 5W-30/5W-40/10W-30 multigrade for temperate ranges, 15W-40 for warm climates, and SAE 50 monograde for sustained heat up to about 50 C (122 F). |
| Cooling system | Not published for the original MT745. The later MT745C lists 43.3 L (11.4 US gal); different, larger engine, given for reference only. | Ethylene/propylene-glycol antifreeze meeting ASTM D3306, mixed 40-60% with water. Factory documentation calls out the industry standard rather than a proprietary coolant brand. |
| Fuel tank | 447 L (118 US gal) with the standard 88 in rear-axle/track spacing, built up from a 345 L (91 US gal) rear tank plus a 113.7 L (30 US gal) side tank. Wider 120/160 in spacing adds a second side tank for roughly 674-787 L (178-208 US gal) in North American configurations; international literature lists a 526 L (139 US gal) optional tank instead. Later MT745C uses different tank hardware: 413 L (109 US gal) standard gauge or 640 L (169 US gal) wide gauge. | Diesel fuel meeting standard road-diesel specification (density 0.82-0.84 kg/dm3 at 15 C / 59 F, viscosity 2-4.5 mm2/s at 40 C / 104 F, cetane index 51 minimum per the later-generation factory spec). Original-series fuel spec not separately confirmed but expected to match. |
| Hydraulic system (shared with powershift transmission and final drives) and tank | Original MT745 operating spec: 200 bar (2,900 psi) at 164.7 L/min (43.5 US gpm) standard-pump flow, rising to about 223-224 L/min (59 US gpm) with the optional high-flow pump; tank/reservoir volume is not separately published for this series. The later MT745C lists a combined-circuit reservoir of 219 L (58 US gal) standard gauge, 227 L (60 US gal) wide gauge, or 257 L (68 US gal) ultra-wide gauge - reference only, different generation. | AGCO Permatran 821XL SAE 10W-30 (cross-compatible with Cat TO-4-class fluid) serves hydraulics, the powershift transmission, and the final drives together from one shared reservoir - there is no separate transmission or final-drive fill on this platform. A TO-4-spec synthetic option is listed for extreme cold-start service. |
| Final drives / undercarriage hub oil (front idler, midwheel, and drive-wheel hubs) | Not published for the original MT745. The later MT745C lists individual hub fills of 0.45 L (0.12 US gal) front idler hub, 0.189 L (0.05 US gal) midwheel hub, and 1.59 L (0.42 US gal) drive-wheel hub - reference only, different generation. | Same oil family as the shared hydraulic/transmission/final-drive circuit: AGCO Permatran 821XL SAE 10W-30 or an equivalent TO-4-class oil. |
| Grease (chassis and track/undercarriage points) | Not a fill-volume item; serviced per interval at individual grease fittings rather than from a reservoir. | Standard practice for this class of track tractor is an NLGI No. 2 multipurpose extreme-pressure grease. No document-specific brand name for this exact model was confirmed in available sourcing - verify against the OMM grease chart or with a dealer. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar MTC745 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 3,000 h |
|
Servicing the MTC745 beyond the schedule
Predictive Maintenance & Fluid Analysis
Sample AGCO Permatran 821XL from the shared transmission-hydraulic-final-drive circuit at every fluid change; because one fluid feeds all three systems, wear-metal trends flag pump, clutch-pack, or final-drive wear before a failure cascades. Run engine oil analysis on the C9/ACERT block to catch injector or turbo wear early. Watch cab track-tension pressure daily and the nitrogen accumulator precharge at scheduled checks; a slow bleed-down there is the earliest warning of Mobil-Trac belt or tensioner-cylinder trouble.
Corrective & Common Repairs
Expect rock-embedded or torn drivewheel and idler rubber on stony ground; check groove depth and steel-cord exposure at every track inspection rather than waiting for a slip complaint. Powershift electromagnetic clutch valves and shift solenoids are a recurring fault-code source on both B and C generations. Swap the suspect solenoid before condemning the valve body. On MT745C ADEM-controlled engines, injector and rail-pressure fault codes usually point to fuel filtration lapses first; check the water separator before pulling injectors.
Overhaul & Rebuild Points
Mobil-Trac belts are the single largest rebuild cost on this platform; replace when guide lugs crack through or carcass cords show, then reset alignment using the idler adjustment bolts, not by eye. Rebuild drivewheel, idler, and midroller rubber as a set once tread depth or rubber loss passes factory wear limits; mixing worn and new components accelerates uneven wear. At engine mid-life, plan turbocharger and injector overhaul together on the C9/ACERT block, and inspect swing-link cap bolts whenever the undercarriage is apart.
Seasonal & Environment Servicing
Recheck Mobil-Trac tension after major temperature swings; the nitrogen-charged tensioner pressure drifts with ambient temperature, and cold mornings need a tension check before the first pass. In freezing conditions, avoid parking with belts sitting in mud or standing water that can freeze the undercarriage solid overnight. In dusty row-crop or tillage work, service the cab pressurizer and air-intake pre-cleaner more often than the base interval to protect the ADEM electronics and cab filtration on C-series machines.
MTC745 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.
MTC745 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CID 100-01 | Engine oil pressure reading is valid but below the normal operating range for current engine speed. | Low oil level, worn oil pump, plugged suction screen, or a faulty oil pressure sensor/circuit. | Check oil level and condition first. Shut down if pressure is critically low to prevent bearing damage, then check sensor wiring before replacing parts. |
| CID 110-00 | Engine coolant temperature reading is valid but above the normal operating range. | Low coolant level, plugged radiator or screens, failed thermostat, or a fan drive fault. | Check coolant level and clean radiator screens first. Let the engine cool before opening the system, then verify thermostat and fan operation. |
| CID 111-01 | Coolant level sensor reports level below normal (low coolant warning). | External coolant leak, loose hose clamp, or a failed level sensor. | Check for visible leaks and top off coolant. Inspect hoses and the radiator cap. Replace the sensor only if level is confirmed correct and the code persists. |
| CID 164-02 | Hydraulic actuation oil pressure signal to the HEUI fuel injection system is erratic or out of range. | Worn HEUI pump, a leaking injector, a plugged oil pickup or screen, or a faulty actuation pressure sensor. | Check engine oil level and condition first, since low or thin oil starves the HEUI pump. Inspect sensor wiring before condemning the pump or injectors. |
| CID 168-01 | Battery/system voltage seen by the engine ECM is below the normal operating range. | Weak or discharged battery, a bad ground strap, loose alternator connection, or a failing alternator. | Check battery state of charge and terminal condition. Test alternator output and ground connections before replacing the ECM or alternator. |
| CID 190-08 | Engine speed/timing sensor signal frequency is abnormal. | Sensor air gap out of adjustment, a damaged timing wheel, or a wiring/connector fault. | Check and reset the sensor air gap to specification. Inspect the connector and harness before replacing the sensor. |
| CID 253 | ECM personality module (calibration/software) fault or mismatch detected. | Corrupted flash file, wrong software rating loaded, or an internal ECM memory fault. | Reflash the ECM with the correct engine rating using Cat electronic service tools. Replace the ECM only if reprogramming fails to clear the fault. |
| CID 94-01 | Fuel delivery pressure at the filter/rail is valid but below normal. | Clogged fuel filter, air drawn into the fuel system, a weak lift pump, or a restricted fuel line. | Replace fuel filters and check for suction-side air leaks. Test lift pump output before deeper teardown. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
MTC745 attachments & work tools
Drawbar / towed-implement hitching
Standard equipment is a swinging clevis drawbar for pulling tillage, planting, and cart-type implements. A wide-swing variant (roughly +/-32 degrees) is offered for solid-seeded/row-crop field work, with tapered rollers and rubber bumpers to cut wear and shock loading on turns.
Three-point hitch (rear linkage)
Electro-hydraulic Type III rear linkage rated near 7,257 kg (16,000 lb) lift capacity, with electronic control integrating track-slip compensation for mounted implements. Exact category/pin spacing can vary by hitch kit ordered.
PTO (power take-off)
Rear PTO only, 1000 rpm output on a 1-3/4 in, 20-spline shaft, engaged through a hydraulically actuated wet multi-disc clutch for soft engagement under load. This is the class-typical rear PTO spec for this size of track tractor; front PTO is not documented for this family.
Hydraulic remote valve / coupler kits
Two-pump, load-sensing hydraulic system with electronic fingertip spool control; factory or dealer-fit remote valve kits with flat-face quick couplers connect trailed implements. Reported configurations run 4-6 remote valves with roughly 165 l/min (43.5 gpm) combined flow, and a power-beyond option supports continuous-flow implements such as air seeders or drills. Exact valve count and flow vary by configuration ordered.
Undercarriage / track system
Runs on the rubber-belted Mobil-trac undercarriage rather than wheels. Belt widths in this tractor family are commonly quoted as either 25 in or 30 in, with width chosen to match row spacing and flotation needs; confirm the specific belt width fitted to a given serial with the dealer.
Ballast / weight distribution
Front track-frame idler weights are standard (about 8 x 57 kg) to balance mounted three-point implements, and can be built out to roughly 24 x 57 kg (up to 12 per side) for heavier front loading. Unweighted, the tractor sits close to 60/40 front-to-rear.
Typical work-tool families for this size class
As a roughly 250-260 engine hp / low-200s PTO hp track tractor, it is matched to heavy primary tillage (chisel plows, disk rippers, mulch finishers), secondary tillage (field cultivators, disk harrows), and planting/seeding tools (air seeders, drills, planters) run off the drawbar or rear linkage, sized to this horsepower class rather than to a single named implement.
All MTC745 assemblies by section
Every catalogued assembly group for the Caterpillar MTC745. 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 |
191-5094 Turbocharger Gp
| 13***01 | Housing-Turbine | 1 |
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 19***94 | Turbocharger Group | 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 |
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 |
193-3346 Turbocharger Gp
| 13***02 | Clamp As; (Turbine)(Turbine) | 1 |
| 16***63 | Clamp | 2 |
| 17***91 | Hose; (Wastegate) | 1 |
Basic Engine
164-6100 Camshaft Gp
| 10***94 | Plate-Thrust | 1 |
| 16***00 | Camshaft Group | 1 |
| 1B***05 | Key; (Woodruff) | 1 |
189-6308 Cover Gp-Cylinder Block
| 18***08 | Cover Group-Cylinder Block | 1 |
| 5F***81 | Gasket To Flywheel Housing Drain Tube Assembly | 1 |
| 5F***59 | Flange | 1 |
183-3649 Cover Gp-Cylinder Block
| 18***49 | Cover Group-Cylinder Block; -Rear | 1 |
| 20***87 | Breather As; (Crankcase) | 1 |
| 21***10 | Gasket | 1 |
118-1727 Cover Gp-Front Housing
| 11***27 | Cover Group-Front Housing; -Accessory Drive | 1 |
| 13***19 | Seal-Integral; (Integral) | 1 |
| 4W***26 | Cover | 1 |
166-1775 Cover Gp-Front Housing
| 06***55 | Seal-O-Ring (Id=47.22mm) | 1 |
| 12***57 | Washer; (10.85x19.3x1.27-mm Thk) | 2 |
| 13***22 | Stud | 2 |
216-3047 Cover Gp-Front Housing
| 06***55 | Seal-O-Ring (Id=47.22mm) | 1 |
| 06***97 | Cap-Oil Filler; (Engine Oil) | 1 |
| 12***57 | Washer; (10.85x19.3x1.27-mm Thk) | 2 |
164-6490 Cover Gp-Valve Mechanism
| 16***90 | Cover Group-Valve Mechanism | 1 |
| 20***39 | Fastener Assem. | 9 |
| 21***01 | Seal-Bulk; (23-Dm)(Valve Mechanism Cover) | 0 |
164-6148 Crankshaft Gp
| 15***39 | Bearing-Main; (Standard) | 7 |
| 16***47 | Crankshaft Assem. | 1 |
| 16***66 | Plate-Thrust | 2 |
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 |
161-3406 Cylinder Block Gp
| 0S***19 | Plug-Cup | 1 |
| 16***06 | Cylinder Block Group | 1 |
| 1W***07 | Sleeve | 2 |
204-9539 Cylinder Block Gp
| 03***53 | Seal-O-Ring; (08.92mm Id) | 1 |
| 16***24 | Seal-Liner | 6 |
| 19***62 | Liner-Cylinder Block | 6 |
201-2180 Cylinder Head As
| 17***88 | Seat-Valve | 12 |
| 17***90 | Seat-Valve | 12 |
| 17***37 | Sleeve-Injector | 6 |
210-5985 Cylinder Head As
| 17***88 | Seat-Valve | 12 |
| 17***90 | Seat-Valve | 12 |
| 21***85 | Cylinder Head As | 1 |
210-5984 Cylinder Head Gp
| 15***06 | Seal-O-Ring; (11.89mm Id) | 5 |
| 16***42 | Valve; (Intake) | 12 |
| 16***44 | Guide-Valve | 24 |
161-3405 Cylinder Head Gp
| 16***05 | Cylinder Head Group | 1 |
| 16***71 | Fastener Group-Cylinder Head | 26 |
| 18***15 | Gasket Assem. | 1 |
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 |
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 |
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 |
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 |
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 |
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 |
| 19***66 | Housing-Front | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
193-3293 Lifting Gp-Engine
| 19***93 | Lifting Group-Engine | 1 |
| 19***94 | Plate-Lift Eye | 1 |
| 5P***45 | Washer-Hard; (13.5x25.5x3-mm Thk)(Turbocharger Blanking Plate) | 3 |
169-3113 Lifting Gp-Engine
| 16***85 | Plate-Lifting; (Rear) | 1 |
| 16***13 | Lifting Group-Engine | 1 |
| 5P***45 | Washer-Hard; (13.5x25.5x3-mm Thk)(Turbocharger Blanking Plate) | 3 |
187-3884 Mounting Gp-Fan Drive
| 18***84 | Mounting Group-Fan Drive | 1 |
| 18***87 | Support As-Fan | 1 |
| 18***56 | Block | 1 |
187-3076 Pan Gp-Oil
| 18***85 | Pan-Oil; (Engine Oil) | 1 |
| 18***76 | Pan Group-Oil; -Engine | 1 |
| 19***14 | Gasket-Oil Pan; (Engine) | 1 |
188-9141 Piston & Rod Gp
| 15***51 | Skirt-Piston | 1 |
| 16***72 | Bearing-Connecting Rod | 1 |
| 16***97 | Bolt | 2 |
177-7878 Piston Gp
| 17***78 | Piston Group | 1 |
| 18***41 | Piston & Rod Group | 6 |
169-3105 Plug Gp-Engine
| 16***05 | Plug Group-Engine | 1 |
| 3D***24 | O-Ring - For Oil Drain & Level Plug (Items 3 & 7) | 1 |
| 6V***49 | Seal-O-Ring (Id=11.89mm); (11.89-mm Id) | 2 |
206-6437 Plug Gp-Engine
| 20***37 | Plug Group-Engine | 1 |
| 3D***24 | O-Ring - For Oil Drain & Level Plug (Items 3 & 7) | 2 |
| 5P***17 | Adapter- To Logic Valve 1u***59 | 1 |
7e-2313 Drain Gp-Engine Oil
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 1 |
| 7E***13 | Plug Group-Oil Pan | 1 |
| 9X***30 | Plug-Drain; (Magnetic)(Engine Oil Pan) | 1 |
193-1726 Pulley Gp
| 10***26 | Retainer-Bearing | 1 |
| 11***38 | Plate; (Thrust) | 1 |
| 12***56 | Shaft-Fan | 1 |
175-3223 Pulley As-Idler
| 12***90 | Bolt; (M10x1.5) | 1 |
| 12***91 | Cover-Dust | 1 |
| 12***92 | Pulley As-Idler; (8-Groove) | 1 |
213-9320 Rocker Arm Gp -Exhaust
| 16***47 | Rocker Arm As | 1 |
| 18***65 | Screw-Adjustment; (M10x1.5-Thd) | 1 |
| 21***20 | Rocker Arm Group; -Exhaust | 1 |
213-9321 Rocker Arm Gp -Intake
| 16***49 | Rocker Arm As | 1 |
| 18***65 | Screw-Adjustment; (M10x1.5-Thd) | 1 |
| 21***21 | Rocker Arm Group; -Intake | 1 |
178-3899 Seal Gp-Crankshaft
| 11***21 | Seal Group-Crankshaft; (Front) | 1 |
| 17***99 | Seal Group-Crankshaft | 1 |
| 18***61 | Seal Group-Crankshaft; (Rear) | 1 |
185-5334 Support Gp-Engine
| 18***34 | Support Group-Engine; -Front | 1 |
| 20***44 | Support-Engine | 2 |
| 6V***44 | Bolt; (M16x2.0x35mm) | 4 |
171-4685 Support Gp-Engine
| 16***06 | Support-Rear | 1 |
| 17***85 | Support Group-Engine | 1 |
| 1U***46 | Sealant (For Locations A) | 0 |
215-9571 Valve Mechanism Gp
| 16***45 | Shaft As-Rocker Arm | 1 |
| 16***59 | Spring | 6 |
| 16***69 | Stand; (End) | 2 |
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 |
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 |
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
188-3506 Alternator Gp-Charging
| 11***79 | Alternator Group-Charging | 1 |
| 12***40 | Support-Alternator | 1 |
| 13***82 | Support-Alternator | 1 |
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 |
206-6446 Connection Gp-Electrical
| 20***46 | Connection Group-Electrical; -Air Inlet Heater | 1 |
| 20***96 | Cable As | 1 |
| 3T***88 | Terminal-Ring; (4-Ga, 7/16-In Screw) | 1 |
180-6004 Connection Gp-Electrical
| 10***29 | Stud; (M10x1.5-Thd) | 1 |
| 10***03 | Cap; (Stud Protector) | 1 |
| 18***04 | Connection Group-Electrical | 1 |
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 |
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 |
179-4954 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 |
177-1420 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 |
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 |
177-1414 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 |
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 |
179-4952 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 |
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 |
177-1421 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***05 | Cylinder Head 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 |
194-4161 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***06 | Cylinder Block 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 |
177-1415 Engine Ar-Core
| 15***18 | Gear Group-Front | 1 |
| 15***27 | Valve Mechanism Group | 1 |
| 16***06 | Cylinder Block Group | 1 |
Frame And Body
206-5947 Mounting Gp -Solenoid
| 20***46 | Bracket | 1 |
| 20***47 | Mounting Group; -Solenoid | 1 |
| 3E***53 | Washer-Hard; (11x25x3-mm Thk) | 2 |
Fuel System
217-2570 Injector Gp-Fuel
| 10***07 | Seal-O-Ring; (Fuel System) | 1 |
| 14***03 | Seal-O-Ring; (Fuel System) | 1 |
| 14***40 | Ring-Backup; (37.36mm Od), Flasher Switch; Hazard, Replaces 421164a1, Flasher Switch | 1 |
236-0962 Injector Gp-Fuel
| 10***07 | Seal-O-Ring; (Fuel System) | 1 |
| 14***03 | Seal-O-Ring; (Fuel System) | 1 |
| 14***40 | Ring-Backup; (37.36mm Od), Flasher Switch; Hazard, Replaces 421164a1, Flasher Switch | 1 |
204-7454 Lines Gp-Fuel
| 03***42 | Elbow Hose Assembly To | 1 |
| 03***47 | Elbow-Filtered Fuel From Based Assembly | 2 |
| 12***33 | Clip | 1 |
189-3803 Lines Gp-Fuel Filter
| 00***15 | Insert | 1 |
| 03***42 | Elbow Hose Assembly To | 1 |
| 03***47 | Elbow-Filtered Fuel From Based Assembly | 1 |
166-1759 Pump Gp-Unit Injection
| 16***59 | Pump Group-Unit Injection | 1 |
| 17***80 | Pump Group-Unit Injection | 6 |
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 |
204-4944 Pump Gp-Unit Injector Hyd
| 20***44 | Pump Group-Unit Injector Hydraulic | 1 |
165-4450 Pump Gp-Unit Injector Hyd
| 03***50 | Elbow (Check Valve Drain Tube) | 1 |
| 15***06 | Seal-O-Ring; (11.89mm Id) | 3 |
| 15***07 | Seal-O-Ring | 2 |
Lubrication System
183-3700 Filter Gp-Engine Oil
| 03***53 | Seal-O-Ring; (08.92mm Id) | 1 |
| 18***56 | Base As-Oil Filter | 1 |
| 18***00 | Filter Group-Engine Oil | 1 |
206-6441 Filter Gp-Engine Oil
| 1R***16 | Filter As-Engine Oil; (Standard Efficiency) | 1 |
| 20***62 | Seal | 1 |
| 20***41 | Filter Group-Engine Oil | 1 |
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 |
165-4465 Lines Gp-Turbocharger Oil
| 16***65 | Lines Group-Turbocharger Oil | 1 |
| 16***66 | Tube As | 1 |
| 18***98 | Connector As | 1 |
188-8840 Lines Gp-Turbocharger Oil
| 18***99 | Connector As | 1 |
| 18***40 | Lines Group-Turbocharger Oil | 1 |
| 18***41 | Hose 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 |
MTC745 serial number reference
The PIN plate is mounted on the tractor's main frame. Read it as a 3-letter model prefix followed by a running sequence number (for example ALA40123): the letters pin down the specific model and production block, and the leading digit(s) of the sequence often line up with the model year or update generation. Exact plate side/position can vary by production run; check the plate itself or confirm with a dealer if it is not immediately visible near the frame/hitch area.
| Prefix | Identifies | Notes |
|---|---|---|
| ALA | MT745 / MT745B Challenger track-type (rubber-belted, Mobil-trac) tractor, C9-engine generation | Identifies the MTC745 rubber-tracked Challenger tractor, built at the Jackson, Minnesota plant. This is a crawler/track tractor riding on a rubber belt undercarriage, not a wheeled machine. Early build blocks run ALA20001-29999 (2002 model year), ALA30001-39999 (2003), and ALA40001 and up (2004). The updated 'B' tractor keeps the same ALA prefix, resuming at ALA60001 and up starting in 2005. Machines across this prefix span are fitted with the Caterpillar C9 diesel engine (the B-update retains C9, with emissions tier varying by production date/market). |
Frequently asked questions
What engine does the Caterpillar MTC745 use?
All three 745 generations use a Caterpillar C-9 8.8-liter inline-six turbo diesel, supplied by Caterpillar even after AGCO took over Challenger production in 2002. The original MT745 (2002-2004) used the earlier mechanical/electronic C-9 rated near 190 kW (255 hp) gross. The MT745B and MT745C both moved to the Tier 3 C9 ACERT rated near 200 kW (269 hp) gross, with the C-series adding full ADEM electronic engine control on top of the same block.
What is the operating weight of the Caterpillar MTC745?
Operating weight varies by generation and ballast configuration. The original 2002-2004 MT745 runs around 12.8 tonnes (28,195 lb), the MT745B climbs to about 14.1 tonnes (31,075 lb), and the MT745C is reported in the roughly 14.7-15 tonne range depending on tire/track choice, fuel tank size, and counterweights.
What replaced the Caterpillar MTC745 / Challenger MT745?
No factory-named direct successor to the MT745C is documented. AGCO discontinued the MT700C series (745C, 755C, 765C) around 2016, and the following E-series lineup starts one size up at the MT755E, with no MT745E ever offered, so there is no one-for-one replacement carrying the "745" designation forward. Confirm current model cross-reference with an AGCO/Challenger dealer.
What MTC745 owners discuss
What's the real difference between the original MT745 and the later MT745C ACERT engine, and does either have a bad reputation?
Both generations run the Cat C9, an 8.8 L (537 cu in) turbocharged diesel, rated at roughly 190 kW (255 hp) on the original 2002-2004 series and about 200 kW (269 hp) on the 2008-2016 ACERT "C" series. The C-series adds ACERT electronic combustion controls to meet Tier 3, but it does not carry a diesel particulate filter or SCR system, so it avoids the regen and DEF headaches that show up on later Final Tier 4 machines. The C9's HEUI (hydraulic electronic unit injection) fuel system is generally regarded as tough if oil condition and fuel quality are kept up, though at least one original-series unit lost its HEUI pump early in life, around 400 hours, after sustained steep-slope work - several owners tie that failure pattern to the pump running marginal on oil supply under those conditions, and running the sump a bit above minimum before hillside work is a preventive step some follow. Have your dealer verify HEUI pump pressure and pull any fuel-system codes before assuming a part failure.
Why do these track tractors seem to slip or chew up their mid-roller wheels?
Two related complaints repeat across owners. First, the rubber facing bonded to the mid-roller (bogie) wheels on early-production machines can separate from the steel hub over time; poly-urethane-coated replacement wheels have become the standard fix and largely stop the problem once fitted. Second, mud, wet crop residue, or corn silage packing on top of the rubber belt between the belt and the drive or mid wheels lets the drive wheel spin inside the track instead of driving it, which shows up as a sudden loss of pull with the engine still under load. It's treated as an inherent trait of the twin rubber-belt (Mobil-Trac) design in soft or trashy going rather than a fixable defect, so operators plan around it instead of expecting a repair.
How critical is track tension, and what else needs regular attention in the undercarriage?
Track tension is held by a hydraulic ram backed by a nitrogen-charged accumulator, and it has to stay within the service spec: too loose and the belt can throw or wear unevenly at the edges, too tight and it accelerates wear on the mid-rollers and idler wheels. Separately, the idler wheel and mid-roller hubs each hold only a small volume of oil, so even a minor seal leak can drain a hub faster than expected - checking hub oil level regularly, and more often after wet or muddy work, is standard owner practice rather than an occasional task. Track tension and hub bearing setup affect stability and load-carrying safety - have your dealer verify tension pressure and hub oil level if you're unsure.
Is there a known weak point in the final drives?
On MT700-series machines built before a later bearing-spacing revision, a range that includes the base and "B" MT745, the two main final-drive bearings sit closer together than in later production, so they carry more side-load than the revised design. Technicians call this out as a cause of premature final-drive bearing wear, especially on units that spend a lot of time pulling heavy mounted, not just towed, implements. Later-production final drives widen that bearing spacing to correct it. On a pre-purchase inspection, checking final-drive play and listening for bearing noise on an early or mid-production unit is worth the extra time.
What wears out the transmission and PTO clutch packs early?
The powershift transmission holds up well on a normal service schedule, meaning oil and filter changes at the listed interval and recalibration after major service, but the recurring owner complaint is using the inching pedal to feather or hold a heavy load instead of using it only for start-up and spotting - that habit overheats and glazes the clutch packs well before their normal life. Keeping the transmission oil cooler clean matters too, since a partially plugged cooler lets the transmission run hot, which shortens clutch life the same way. Have your dealer verify inching pedal calibration and clutch pack condition if you notice slipping or a burnt-oil smell.
What usually causes hard cold-weather starting?
Reported no-start or hard-start complaints in cold weather trace back to one of two things almost every time: a battery that's aged or undersized for the C9's cranking load once temperatures drop, or a fault somewhere in the glow-plug circuit - a dead plug, a bad glow-plug relay or controller, or a wiring fault feeding the request from the ECM. Pulling stored codes with a diagnostic reader before swapping parts narrows the problem to the actual failed component instead of guessing. Have your dealer scan the glow-plug circuit and battery/charging system before condemning either one.
What should I check before buying a used MTC745?
Confirm which series it is first, the original 2002-2004 Cat C9 or the 2008-2016 ACERT "C" model, since manuals, part sourcing, and expected engine behavior differ between them. Then walk the undercarriage: remaining belt tread (life varies widely, roughly a couple thousand to several thousand hours depending on soil type and use), condition of the mid-roller rubber-to-hub bond or confirmation that poly-coated wheels are already fitted, and any oil seepage at the idler or mid-roller hubs. Check final-drive play and listen for bearing noise, particularly on earlier-production units that have run heavy mounted implements. Ask for transmission service records and rule out habitual inching-pedal abuse. Finally, have your dealer connect a diagnostic tool, pull stored fault codes, and run a full pre-purchase inspection before you commit to a price.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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