Compare/Challenger MT645C vs Challenger MT665B

Challenger MT645C vs Challenger MT665B

Verdict: Challenger MT645C vs Challenger MT665B

The Challenger MT645C and the Challenger MT665B are both tractors — here is how they stack up on the figures that matter. Challenger MT665B leads on rated power with 246 hp against 240 hp. Challenger MT665B is the lighter machine (19,550 kg vs 24,250 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Challenger MT645C is the newer design (2009 vs 2005). In short: choose the Challenger MT665B for outright pulling power, or the Challenger MT645C if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Acreage600 acBudgetMain crop / use

Fit & specs

Challenger

Fit score

Best match

Clear

Challenger

Fit score

Best match

Clear

Rated power

240 hp

246 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Challenger (a part of AGCO)Reference

Pull at 4.02 KPHReference

Pull at 3.7 KPHReference

Final drives

planetaryReference

inboard planetaryReference

Differential lock

electro-hydraulic front and rearReference

electrohydraulic front and rearReference

Trailer brakes

—

hydraulicReference

Variants

8650

similar Massey Ferguson modelReference

—

Engine

Fuel tank

690.0 LReference

—

Exhaust fluid (DEF)

29.9 LReference

—

Engine (gross)

179.0 kWReference

—

Drawbar (tested)

134.3 kWReference

172.4 kWReference

Displacement

8.4 LReference

Bore/Stroke

111 x 145 mmReference

Emissions

Interim Tier 4Reference

—

Emission control

integrated exhaust gas recirculation optional (IECR)Reference

—

Power (gross)

179.0 kWReference

—

Maximum Power

201.3 kWReference

—

Fuel system

electronic high-pressure common railReference

electronic direct injectionReference

Compression

16.7:1Reference

17.5:1Reference

Rated RPM

2200Reference

Torque

1185.1 NmReference

—

Torque RPM

1500Reference

—

Starter

electricReference

—

Starter volts

12Reference

Max power

130.6 kWReference

172.4 kWReference

Power at rated engine speed

161.2 kWReference

183.2 kWReference

Fuel Type

dieselReference

—

No of Cylinders

6 cylinderReference

—

Rated engine speed

2,200 RPMReference

—

Engine torque at rated speed

396.4 kgReference

—

Bore and stroke

4.37x5.71 inchesReference

—

Compression ratio

16.7:1Reference

—

Cooling system

liquid-cooledReference

—

Engine

—

216.3 kWReference

Power

—

216.3 kWReference

Air cleaner

—

dual paper elementsReference

Pre-heating

—

1000W coolant heaterReference

Idle RPM

—

800-2350Reference

Oil capacity

—

67.0 LReference

Coolant capacity

—

33.7 LReference

Transmission

Techstar CVTReference

TechStarReference

Gears

infinite forward and reverseReference

18 forward and 9 reverseReference

Transmission Type

CVTReference

—

Wheel Drive

4WDReference

—

Rear Axle Drive Type

planetaryReference

—

PTO & Hydraulics

PTO (claimed)

152.9 kWReference

179.0 kWReference

PTO (tested)

186.4 kWReference

199.8 kWReference

Type

continuously variable transmissionReference

power shiftReference

Pressure

200.0 barReference

Valves

4 to 6Reference

Pump flow

99.9 lpmReference

—

Total flow

174.9 lpmReference

147.6 lpmReference

Rear Type

IIIReference

Control

electronic lower-link draft sensingReference

—

Rear lift (at ends)

12002 kgReference

—

Rear lift (at 24"/610mm)

9678 kgReference

7076 kgReference

Front Hitch

IIIReference

IIReference

Front lift (at ends)

4998 kgReference

—

Rear PTO

independentReference

Clutch

electro-hydraulicReference

electro-hydraulic wet discReference

Rear PTO Type

540E/1000 (1.375)Reference

1000 (1.75)Reference

Front PTO

independentReference

—

Front PTO Type

1000 (1.375)Reference

—

Power at rated PTO speed

178.2 kWReference

198.3 kWReference

Hydraulic system

—

99.9 LReference

Front lift

—

5488 kgReference

Engine RPM

—

1000@2031Reference

Dimensions

Wheelbase

310 cmReference

307 cmReference

Weight

24250 to 25795 poundsReference

19550 to 20290 poundsReference

Front tire

480/70R34Reference

380/85R34Reference

Rear tire

520/85R46Reference

480/80R46Reference

Standard tires (ag)

Front: 480/70R34. Rear: 520/85R46Reference

—

Length

566 cmReference

523 cmReference

Height (cab)

338 cmReference

313 cmReference

Bar rear axle

109 by 2997 mmReference

Front tread

154 to 225 cmReference

—

Rear tread

148 to 303 cmReference

152 to 223 cmReference

Shipping

10999 kgReference

8867 kgReference

Operating

11700 kgReference

9203 kgReference

Ag front

—

380/85R34Reference

Ag rear

—

480/80R46Reference

Width

—

299 cmReference

Ground clearance

—

56 cmReference

Ballasted

—

13177 kgReference

Max Drawbar

—

2549 kgReference

Max front axle

—

4926 kgReference

Max rear axle

—

7731 kgReference

Challenger MT645C attachments

MT645C Serial Number Location

Electrical

Ground

negativeReference

Charging system

alternatorReference

Charging amps

240Reference

150Reference

Batteries

2Reference

Battery CCA

775Reference

Battery volts

12Reference

Battery options

2Reference

—

Total cold cranking amps

775 CCAReference

—

Capacities

Max capacity

17640 kgReference

—

Capacity

512.6 ciReference

99.9 LReference

Diesel exhaust fluid (DEF) tank

29.9 LReference

—

Fuel

—

601.8 LReference

Test results

Fuel use

52.2 l/hourReference

56.0 l/hourReference

Max pull

12142 kgReference

12279 kgReference

General

Make & Model

Challenger (a part of AGCO)Reference

—

Cruise control

AvailableReference

—

SCV control

JoystickReference

—

Rear Axle Type

BarReference

—

Country of manufacturer

FranceReference

—

PTO

PTO Power

205 hpReference

—

Rear PTO Power

AvailableReference

—

Rear PTO RPM

1,000 RPMReference

—

Front PTO Power

AvailableReference

—

Steering & brakes

Brakes

Hydraulic wet discReference

—

Steering type

PowerReference

—

Hydraulics

Pump Rated Output (total)

46.2 gpmReference

—

Hydraulics Type

Closed Center Load SensingReference

—

Maximum operating pressure

2,901 psiReference

—

Remote Valves

4 to 6 ValvesReference

—

Rear Hitch category (SAE designation)

Category IIIReference

—

Rear Hitch maximum lift capacity

12,002 kgReference

—

Rear Hitch Sensing Type

electronic lower-link draft sensingReference

—

Front Hitch category (SAE designation)

Category IIIReference

—

Dimensions & weight

Height Over Cab

338.1 cmReference

—

Overall Length

566.9 cmReference

—

Overall weight

10,999.6 kgReference

—

Wheels & tyres

Rear Wheel Type

520/85R46Reference

—

Rear wheel tread range

58.5 to 119.5 inchesReference

—

Front Wheel Type

480/70R34Reference

—

Front Wheel tread range

73.1/76.9 inchesReference

—

Operator station

Cab Availability

AvailableReference

—

Seat Suspension

TRUEReference

—

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.