Compare/Challenger MT575B vs Challenger MT645

Challenger MT575B vs Challenger MT645

Verdict: Challenger MT575B vs Challenger MT645

The Challenger MT575B and the Challenger MT645 are both tractors — here is how they stack up on the figures that matter. Challenger MT575B leads on rated power with 185 hp against 181 hp. Challenger MT645 is the lighter machine (8,618 kg vs 15,000 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Challenger MT645 holds more fuel (454.2 L vs 371 L) for longer stints between fills. Challenger MT575B is the newer design (2007 vs 2002). In short: choose the Challenger MT575B for outright pulling power, or the Challenger MT645 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

Tune the fit score

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

185 hp

181 hp

Confidence

40%

Guide price

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Overview

Manufacturer

Challenger (a part of AGCO)Reference

50 KPH speed optional with suspended front axle.Reference

PTO performanceReference

Original price

$141,792 (2009 CVT 4WD )Reference

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Differential lock

electro-hydraulic front and rearReference

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Trailer brakes

hydraulicReference

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Variants

6495

similar Massey Ferguson modelReference

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7495

similar Massey Ferguson modelReference

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Engine

Engine (gross)

138.0 kWReference

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Drawbar (tested)

81.8 kWReference

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Displacement

6.6 LReference

7.4 LReference

Bore/Stroke

105 x 127 mmReference

108 x 134 mmReference

Emissions

Tier IIIReference

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Power (gross)

138.0 kWReference

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Air cleaner

dryReference

dual paper elementsReference

Rated RPM

2200Reference

Starter volts

12Reference

Coolant capacity

25.5 LReference

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Max power

81.8 kWReference

137.6 kWReference

Power at rated engine speed

127.3 kWReference

135.2 kWReference

Fuel Type

dieselReference

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No of Cylinders

6 cylinderReference

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Rated engine speed

2,200 RPMReference

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Emissions compliance

Tier IIIReference

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Bore and stroke

4.14x5.00 inchesReference

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Cooling system

liquid-cooledReference

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Compression

—

16.5:1Reference

Transmission

TechStar CVTReference

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Gears

infinite forward and reverseReference

18 forward and 6 reverseReference

Oil capacity

57.9 LReference

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Transmission Type

PowershiftReference

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Wheel Drive

4WDReference

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PTO & Hydraulics

PTO (claimed)

119.3 kWReference

134.2 kWReference

PTO (tested)

144.5 kWReference

137.6 kWReference

AP6 Hydraulic system

70.0 LReference

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CVT Hydraulic system

99.9 LReference

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Type

continuously variable transmissionReference

power shiftReference

AP6 Capacity

70.0 LReference

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CVT Capacity

99.9 LReference

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Pressure

200.0 barReference

Valves

4 to 5Reference

4Reference

Total flow

147.6 lpmReference

Rear Type

2/3Reference

IIIReference

Rear lift (at 24"/610mm)

6478 kgReference

8346 kgReference

Front Hitch

optionalReference

—

Front lift (at ends)

3991 kgReference

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Rear PTO

independentReference

Clutch

hydraulic wet discReference

electro-hydraulic wet discReference

Rear PTO Type

540/540E/1000 (1.375)Reference

1000Reference

Front PTO

independentReference

—

Front PTO Type

1000 (1.375)Reference

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Power at rated PTO speed

143.6 kWReference

137.1 kWReference

Engine RPM

—

1000@2091Reference

Capacities

Fuel

370.9 LReference

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Capacity

402.8 ciReference

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Fuel tank

371 LReference

454.2 LReference

Dimensions

Wheelbase

289 cmReference

307 cmReference

Weight

15000 to 17595 poundsReference

8618 kgReference

Front tire

11.00-16Reference

14.9R30Reference

2WD Rear tire

18.4R42Reference

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2WD Standard tires (ag)

Front: 11.00-16. Rear: 18.4R42Reference

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4WD Standard tires (ag)

Front: 16.9R28. Rear: 18.4R42Reference

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Length

484 cmReference

515 cmReference

Width

205 cmReference

249 cmReference

Height (cab)

311 cmReference

307 cmReference

Clearance (drawbar)

44 cmReference

—

AP694 by 2334 mm Bar rear axle

3.74 by 91.9 inchesReference

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CVT94 by 2468 mm Bar rear axle

3.74 by 97.2 inchesReference

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Bar rear axle

94 by 2997 mmReference

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Front tread

155 to 226 cmReference

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Rear tread

152 to 304 cmReference

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2WD AP6 Shipping

6804 kgReference

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4WD AP6 Shipping

7302 kgReference

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4WD CVT Shipping

7439 kgReference

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4WD CVT Operating

7981 kgReference

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Ballasted

10439 kgReference

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Rear tire

—

18.4R42Reference

Ag front

—

14.9R30Reference

Ag rear

—

18.4R42Reference

Shipping weight

—

8618 kgReference

Challenger MT575B attachments

Electrical

Ground

negativeReference

Charging system

alternatorReference

Charging amps

150Reference

—

Batteries

2Reference

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Battery CCA

420Reference

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Battery volts

12Reference

Total cold cranking amps

420 CCAReference

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Test results

Fuel use

32.9 l/hourReference

41.3 l/hourReference

Max pull

6985 kgReference

—

Speeds

General

Make & Model

Challenger (a part of AGCO)Reference

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SCV control

JoystickReference

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Country of manufacturer

FranceReference

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Hydraulics

Capacity Valves

24 ValvesReference

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Pump Rated Output (total)

39 gpmReference

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Hydraulics Type

Pressure Flow Compensated (PFC)Reference

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Maximum operating pressure

2,900 psiReference

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Remote Valves

4 to 5 ValvesReference

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Rear Hitch category (SAE designation)

Category 2/3Reference

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PTO

PTO Power

160 hpReference

—

Rear PTO Power

AvailableReference

—

Rear PTO RPM

1,000 RPMReference

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Front PTO Power

AvailableReference

—

Steering & brakes

Brakes

Hydraulic wet disc | hydraulic OptReference

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Steering type

PowerReference

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Dimensions & weight

Height Over Cab

311.9 cmReference

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Overall Length

484.1 cmReference

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Overall Width

206 cmReference

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Drawbar clearance

44.2 cmReference

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Overall weight

7,438.9 kgReference

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Wheels & tyres

Rear Wheel Type

18.4R42Reference

—

Rear wheel tread range

60 to 120 inchesReference

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Front Wheel Type

11.00-16Reference

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Front Wheel tread range

61.2 to 89.2 inchesReference

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Operator station

Cab Availability

AvailableReference

—

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.