Compare/Challenger MT555E vs Challenger MT645

Challenger MT555E vs Challenger MT645

Verdict: Challenger MT555E vs Challenger MT645

The Challenger MT555E and the Challenger MT645 are both tractors — here is how they stack up on the figures that matter. Challenger MT645 leads on rated power with 181 hp against 170 hp. Challenger MT645 holds more fuel (454.2 L vs 431.5 L) for longer stints between fills. Challenger MT555E is the newer design (2015 vs 2002). In short: choose the Challenger MT645 for outright pulling power, or the Challenger MT555E 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

170 hp

181 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Challenger (a part of AGCO)Reference

Gear 1E used for pull test.Reference

PTO performanceReference

Differential lock

electro-hydraulic front and rearReference

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Variants

7719

similar Massey Ferguson modelReference

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Engine

Engine (gross)

126.8 kWReference

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Engine (max)

156.6 kWReference

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Drawbar (tested)

98.2 kWReference

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Displacement

6.6 LReference

7.4 LReference

Bore/Stroke

108 x 120 mmReference

108 x 134 mmReference

Emissions

Tier IVReference

—

Emission control

selective catalytic reduction (SCR)Reference

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Rated Power (gross)

126.8 kWReference

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Maximum Power (gross)

156.6 kWReference

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Air cleaner

dry elementReference

dual paper elementsReference

Compression

17.4:1Reference

16.5:1Reference

Rated RPM

2100Reference

2200Reference

Starter

electricReference

—

Starter volts

12Reference

Max power

98.2 kWReference

137.6 kWReference

Power at rated engine speed

113.2 kWReference

135.2 kWReference

Fuel Type

dieselReference

—

No of Cylinders

6 cylinderReference

—

Rated engine speed

2,100 RPMReference

—

Emissions compliance

Tier IV | selective catalytic reduction (SCR)Reference

—

Bore and stroke

4.252x4.724 inchesReference

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Compression ratio

17.4:1Reference

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Cooling system

liquid-cooledReference

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Transmission

TechStarReference

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Gears

infinite forward and reverseReference

18 forward and 6 reverseReference

Transmission Type

PowershiftReference

—

Wheel Drive

4WDReference

—

Clutch

—

electro-hydraulic wet discReference

PTO & Hydraulics

PTO (claimed)

108.1 kWReference

134.2 kWReference

PTO (tested)

137.7 kWReference

137.6 kWReference

Hydraulic system

99.9 LReference

—

Type

continuously-variable transmission (CVT)Reference

power shiftReference

Capacity

99.9 LReference

—

Pressure

200.0 barReference

Valves

4Reference

SCV flow

99.9 lpmReference

—

Total flow

189.2 lpmReference

147.6 lpmReference

Rear Type

III/IIINReference

IIIReference

Rear lift (at ends)

7575 kgReference

—

Front Hitch

IIINReference

—

Front lift (at ends)

3607 kgReference

—

Rear PTO

independentReference

Rear PTO Type

540/540E/1000/1000EReference

1000Reference

Power at rated PTO speed

127.0 kWReference

137.1 kWReference

Rear lift (at 24"/610mm)

—

8346 kgReference

Engine RPM

—

1000@2091Reference

Capacities

Fuel

431.5 LReference

—

Exhaust fluid (DEF)

41.6 LReference

—

Fuel tank

431.5 LReference

454.2 LReference

Diesel exhaust fluid (DEF) tank

41.6 LReference

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Dimensions

Wheelbase

297 cmReference

307 cmReference

Weight

—

8618 kgReference

Front tire

—

14.9R30Reference

Rear tire

—

18.4R42Reference

Ag front

—

14.9R30Reference

Ag rear

—

18.4R42Reference

Length

—

515 cmReference

Width

—

249 cmReference

Height (cab)

—

307 cmReference

Shipping weight

—

8618 kgReference

Electrical

Ground

negativeReference

Charging system

alternatorReference

Battery volts

12Reference

Test results

Fuel use

33.3 l/hourReference

41.3 l/hourReference

Max pull

7178 kgReference

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General

Make & Model

Challenger (a part of AGCO)Reference

—

Cruise control

AvailableReference

—

SCV control

JoystickReference

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Country of manufacturer

USAReference

—

Power

Rated Power

170 hpReference

—

PTO

PTO Power

145 hpReference

—

Rear PTO Power

AvailableReference

—

Rear PTO RPM

1,000 RPMReference

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Steering & brakes

Brakes

Hydraulic wet disc brakesReference

—

Steering type

Power steeringReference

—

Hydraulics

Pump Rated Output (total)

50 gpmReference

—

Hydraulics Type

Closed-Center Load SensingReference

—

Maximum operating pressure

2,900 psiReference

—

Remote Valves

4 ValvesReference

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Rear Hitch category (SAE designation)

Category III/IIINReference

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Rear Hitch maximum lift capacity

7,575 kgReference

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Front Hitch category (SAE designation)

Category IIINReference

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Operator station

Cab Availability

Cab standard with air-conditioning. Auto-Guide 3,000Reference

—

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.