Compare/Challenger MT645D vs Challenger MT665B

Challenger MT645D vs Challenger MT665B

Verdict: Challenger MT645D vs Challenger MT665B

The Challenger MT645D 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 MT645D is the lighter machine (10,999 kg vs 19,550 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Challenger MT645D is the newer design (2011 vs 2005). In short: choose the Challenger MT665B for outright pulling power, or the Challenger MT645D 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 4.13 KPHReference

Pull at 3.7 KPHReference

Final drives

inboard planetaryReference

Differential lock

electro-hydraulicReference

electrohydraulic front and rearReference

Steering

hydrostatic powerReference

—

Trailer brakes

hydraulic (optional)Reference

hydraulicReference

Variants

8650

similar Massey Ferguson modelReference

—

Engine

Engine (gross)

179.0 kWReference

—

Drawbar (tested)

127.3 kWReference

172.4 kWReference

Displacement

8.4 LReference

Bore/Stroke

111 x 145 mmReference

Emissions

Interim Tier IVReference

—

Emission control

selective catalytic reduction (SCR)Reference

—

Power (gross)

179.0 kWReference

—

Maximum Power

201.3 kWReference

—

Fuel system

electronic high-pressure common railReference

electronic direct injectionReference

Pre-heating

thermostartReference

1000W coolant heaterReference

Compression

16.7:1Reference

17.5:1Reference

Rated RPM

2100Reference

2200Reference

Starter

electricReference

—

Starter volts

12Reference

Max power

127.3 kWReference

172.4 kWReference

Power at rated engine speed

161.0 kWReference

183.2 kWReference

Fuel Type

dieselReference

—

No of Cylinders

6 CylinderReference

—

Rated engine speed

2,100 RPMReference

—

Emissions compliance

Interim Tier IV | selective catalytic reduction (SCR)Reference

—

Bore and stroke

4.370x5.709 inchesReference

—

Compression ratio

16.7:1Reference

—

Cooling system

liquid-cooledReference

—

Engine

—

216.3 kWReference

Power

—

216.3 kWReference

Air cleaner

—

dual paper elementsReference

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

—

forward and reverse options

continuously variable transmission - infinite F and infinite RReference

—

Wheel Drive

4WDReference

—

Track Drive type

inboard planetaryReference

—

PTO & Hydraulics

PTO (claimed)

152.9 kWReference

179.0 kWReference

PTO (tested)

187.0 kWReference

199.8 kWReference

Hydraulic system

110.1 LReference

99.9 LReference

Type

continuously variable transmissionReference

power shiftReference

Capacity

110.1 LReference

99.9 LReference

Pressure

200.0 barReference

Valves

4 to 6Reference

SCV flow

99.9 lpmReference

—

Total flow

174.1 lpmReference

147.6 lpmReference

Rear Type

IIIReference

Rear lift

10323 kgReference

—

Front Hitch

III (optional)Reference

IIReference

Front lift (at ends)

4989 kgReference

—

Drawbar

Cat. 4 (optional)Reference

—

Rear PTO

independentReference

Clutch

electro-hydraulicReference

electro-hydraulic wet discReference

Rear PTO Type

540E/1000/1000E (optional)Reference

1000 (1.75)Reference

Engine RPM

1000@1970Reference

1000@2031Reference

Power at rated PTO speed

186.4 kWReference

198.3 kWReference

Rear lift (at 24"/610mm)

—

7076 kgReference

Front lift

—

5488 kgReference

Capacities

Fuel

632.1 LReference

601.8 LReference

Exhaust fluid (DEF)

60.6 LReference

—

Fuel tank

632.2 LReference

—

Diesel exhaust fluid (DEF) tank

60.6 LReference

—

Dimensions

Wheelbase

309 cmReference

307 cmReference

Weight

10999 kgReference

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

547 cmReference

523 cmReference

Height (cab)

358 cmReference

313 cmReference

Shipping weight

10999 kgReference

—

Max weight

15000 kgReference

—

Front axle

4WD Quadlink SuspensionReference

—

Rear axle

109 by 2997 mmReference

—

Ag front

—

380/85R34Reference

Ag rear

—

480/80R46Reference

Width

—

299 cmReference

Ground clearance

—

56 cmReference

Bar rear axle

—

109 by 2997 mmReference

Rear tread

—

152 to 223 cmReference

Shipping

—

8867 kgReference

Operating

—

9203 kgReference

Ballasted

—

13177 kgReference

Max Drawbar

—

2549 kgReference

Max front axle

—

4926 kgReference

Max rear axle

—

7731 kgReference

Electrical

Ground

negativeReference

Charging system

alternatorReference

Charging amps

240Reference

150Reference

Batteries

2Reference

Battery volts

12Reference

Battery CCA

—

775Reference

Test results

Fuel use

43.5 l/hourReference

56.0 l/hourReference

Max pull

11659 kgReference

12279 kgReference

General

Make & Model

Challenger (a part of AGCO)Reference

—

Drawbar category

Cat. 3Reference

—

Rear Axle Type

4.33 by 105 inchesReference

—

Front Axle Type

4WD | 4WD Quadlink SuspensionReference

—

Country of manufacturer

USAReference

—

Power

Rated Power

240 hpReference

—

PTO

PTO Power

205 hpReference

—

Rear PTO Power

AvailableReference

—

Rear PTO RPM

1,000 RPMReference

—

Engine Speed on Rear PTO speed

540E@1,577 RPMReference

—

Steering & brakes

Brakes

Hydraulic wet disc brakesReference

—

Steering type

hydrostatic powerReference

—

Hydraulics

Pump Rated Output (total)

46 gpmReference

—

Hydraulics Type

closed center load sensing (CCLS)Reference

—

Maximum operating pressure

2,900 psiReference

—

Remote Valves

4 to 6 ValvesReference

—

Rear Hitch category (SAE designation)

Category IIIReference

—

Rear Hitch maximum lift capacity

10,323.8 kgReference

—

Front Hitch category (SAE designation)

Category III (optional)Reference

—

Dimensions & weight

Height Over Cab

358.1 cmReference

—

Overall Length

547.9 cmReference

—

Overall weight

10,999.6 kgReference

—

Wheels & tyres

Rear Wheel Type

520/85R46 agReference

—

Front Wheel Type

480/70R34 agReference

—

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.