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Challenger MT645B vs Challenger MT655
Verdict: Challenger MT645B vs Challenger MT655
The Challenger MT645B and the Challenger MT655 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 205 hp. Challenger MT655 is the lighter machine (9,752 kg vs 18,308 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Challenger MT645B is the newer design (2005 vs 2002). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
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Fit & specs
Challenger
85
Fit score
Best match
Clear
Challenger
85
Fit score
Best match
Clear
Rated power
205 hp
205 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
Challenger (a part of AGCO)Reference
Challenger (a part of AGCO)Reference
Pull at 10 KPHReference
Gear 6 used for pull test.Reference
Final drives
inboard planetaryReference
—
Differential lock
electrohydraulic front and rearReference
—
Trailer brakes
hydraulicReference
—
Engine
Engine
175.2 kWReference
—
Drawbar (tested)
128.5 kWReference
123.1 kWReference
Displacement
7.4 LReference
8.4 LReference
Bore/Stroke
108 x 134 mmReference
111 x 145 mmReference
Power
175.2 kWReference
—
Air cleaner
dual paper elementsReference
dual paper elementsReference
Pre-heating
1000W coolant heaterReference
—
Compression
17.5:1Reference
16.5:1Reference
Rated RPM
2200Reference
2200Reference
Starter volts
12Reference
12Reference
Oil capacity
67.0 LReference
—
Coolant capacity
33.7 LReference
—
Max power
128.5 kWReference
123.1 kWReference
Power at rated engine speed
152.7 kWReference
153.2 kWReference
Fuel tank
—
454.2 LReference
Transmission
Transmission
TechStarReference
—
Gears
infinite forward and reverse (2-range)Reference
18 forward and 6 reverseReference
PTO & Hydraulics
PTO (claimed)
149.1 kWReference
149.1 kWReference
PTO (tested)
166.2 kWReference
161.6 kWReference
Hydraulic system
99.9 LReference
—
Type
continuously variable transmission (CVT)Reference
power shiftReference
Capacity
99.9 LReference
—
Pressure
200.0 barReference
200.0 barReference
Valves
4 to 6Reference
4Reference
Total flow
147.6 lpmReference
147.6 lpmReference
Rear Type
IIIReference
IIIReference
Rear lift (at 24"/610mm)
7076 kgReference
8935 kgReference
Front Hitch
IIReference
—
Front lift
5488 kgReference
—
Rear PTO
independentReference
independentReference
Clutch
electro-hydraulic wet discReference
electro-hydraulic wet discReference
Rear PTO Type
1000 (1.75)Reference
1000Reference
Engine RPM
1000@2031Reference
1000@2091Reference
Power at rated PTO speed
165.2 kWReference
158.3 kWReference
Capacities
Fuel
601.8 LReference
—
Dimensions
Wheelbase
307 cmReference
307 cmReference
Weight
18308 to 19595 poundsReference
9752 kgReference
Front tire
380/85R34Reference
600/70R28Reference
Rear tire
480/80R46Reference
650/85R38Reference
Ag front
380/85R34Reference
600/70R28Reference
Ag rear
480/80R46Reference
650/85R38Reference
Length
523 cmReference
515 cmReference
Width
299 cmReference
249 cmReference
Height (cab)
313 cmReference
307 cmReference
Ground clearance
56 cmReference
—
Bar rear axle
109 by 2997 mmReference
—
Rear tread
152 to 223 cmReference
—
Shipping
8304 kgReference
—
Operating
8888 kgReference
—
Max Drawbar
2549 kgReference
—
Max front axle
4926 kgReference
—
Max rear axle
7731 kgReference
—
Shipping weight
—
9752 kgReference
Electrical
Ground
negativeReference
negativeReference
Charging system
alternatorReference
alternatorReference
Charging amps
150Reference
—
Batteries
2Reference
—
Battery CCA
775Reference
—
Battery volts
12Reference
12Reference
Test results
Fuel use
45.4 l/hourReference
50.0 l/hourReference
Max pull
7690 kgReference
9419 kgReference
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.