Compare/Challenger MT645E vs Challenger MT665

Challenger MT645E vs Challenger MT665

Verdict: Challenger MT645E vs Challenger MT665

The Challenger MT645E and the Challenger MT665 are both tractors — here is how they stack up on the figures that matter. Challenger MT665 leads on rated power with 227 hp against 218 hp. Challenger MT665 is the lighter machine (9,752 kg vs 10,800 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Challenger MT645E holds more fuel (628.3 L vs 454.2 L) for longer stints between fills. Challenger MT645E is the newer design (2014 vs 2002). In short: choose the Challenger MT665 for outright pulling power, or the Challenger MT645E if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Challenger

Fit score

Best match

Clear

Challenger

Fit score

Best match

Clear

Rated power

218 hp

227 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Challenger (a part of AGCO)Reference

Pull at 2.45KPHReference

Gear 6 used for pull test.Reference

Differential lock

electro-hydraulicReference

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Steering

hydrostatic powerReference

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Variants

8727

similar Massey Ferguson modelReference

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Engine

Fuel tank

628.3 LReference

454.2 LReference

Exhaust fluid (DEF)

59.8 LReference

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Engine

179.0 kWReference

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Drawbar (tested)

155.9 kWReference

136.5 kWReference

Displacement

8.4 LReference

Bore/Stroke

111 x 145 mmReference

Emissions

Tier IVReference

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Emission control

selective catalytic reduction (SCR)Reference

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Power

179.0 kWReference

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Maximum Power

201.3 kWReference

—

Rated RPM

2100Reference

2200Reference

Starter

electricReference

—

Starter volts

12Reference

Max power

155.9 kWReference

136.5 kWReference

Power at rated engine speed

162.4 kWReference

168.9 kWReference

Fuel Type

dieselReference

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No of Cylinders

6 CylinderReference

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Rated engine speed

2,100 RPMReference

—

Emissions compliance

Tier IV | selective catalytic reduction (SCR)Reference

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Bore and stroke

4.37x5.71 inchesReference

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Cooling system

liquid-cooledReference

—

Air cleaner

—

dual paper elementsReference

Compression

—

16.0:1Reference

Transmission

Techstar CVTReference

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Gears

infinite forward and reverse (2-range)Reference

18 forward and 6 reverseReference

Transmission Type

CVTReference

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forward and reverse options

continuously variable transmission - infinite F and (2-range) RReference

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Wheel Drive

4WDReference

—

Clutch

—

electro-hydraulic wet discReference

PTO & Hydraulics

PTO (claimed)

152.9 kWReference

167.8 kWReference

PTO (tested)

180.9 kWReference

178.5 kWReference

Type

continuously variable transmission (CVT)Reference

power shiftReference

Pressure

200.0 barReference

Valves

4 to 6Reference

4Reference

Pump flow

204.4 lpmReference

—

Rear Type

III/IVNReference

IIIReference

Rear lift (at ends)

11999 kgReference

—

Drawbar

Cat 4 (optional)Reference

—

Rear PTO

independentReference

Rear PTO Type

1000/1000E (1.75)Reference

1000Reference

Power at rated PTO speed

180.0 kWReference

172.5 kWReference

Total flow

—

147.6 lpmReference

Rear lift (at 24"/610mm)

—

8935 kgReference

Engine RPM

—

1000@2091Reference

Dimensions

Wheelbase

309 cmReference

307 cmReference

Weight

10800 kgReference

9752 kgReference

Length

555 cmReference

515 cmReference

Height (cab)

358 cmReference

307 cmReference

Shipping weight

10800 kgReference

9752 kgReference

Bar rear axle

109 by 2997 mmReference

—

Front tire

—

600/70R28Reference

Rear tire

—

650/85R38Reference

Ag front

—

600/70R28Reference

Ag rear

—

650/85R38Reference

Width

—

249 cmReference

Electrical

Ground

negativeReference

Charging system

alternatorReference

Charging amps

240 (twin 120A)Reference

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Charging volts

12Reference

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Battery volts

12Reference

Test results

Fuel use

54.1 l/hourReference

55.3 l/hourReference

Max pull

10319 kgReference

9491 kgReference

General

Make & Model

Challenger (a part of AGCO)Reference

—

Cruise control

AvailableReference

—

Drawbar category

Cat. 3Reference

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Rear Axle Type

Bar: 4.33 by 105 inchesReference

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Country of manufacturer

USAReference

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Capacities

Capacity

512.6 ciReference

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Diesel exhaust fluid (DEF) tank

59.8 LReference

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Hydraulics

Capacity Valves

24 ValvesReference

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Hydraulics Type

closed center load sensing (CCLS)Reference

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Maximum operating pressure

2,900 psiReference

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Remote Valves

4 to 6 ValvesReference

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Rear Hitch category (SAE designation)

Category III/IVNReference

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Rear Hitch maximum lift capacity

11,999.8 kgReference

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Power

Rated Power

240 hpReference

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PTO

PTO Power

205 hpReference

—

Rear PTO Power

AvailableReference

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Rear PTO RPM

1,000 RPMReference

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Steering & brakes

Brakes

Hydraulic wet disc brakesReference

—

Steering type

hydrostatic powerReference

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Dimensions & weight

Height Over Cab

358.1 cmReference

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Overall Length

555.2 cmReference

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Overall weight

10,800 kgReference

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Operator station

Cab Availability

AvailableReference

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Seat Suspension

TrueReference

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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.