Challenger MT645D

Last Updated: July 2024

Overview

The Challenger MT645D is a power-brimming tractor strengthened by its AGCO Power sourced engine. This 6-cylinder, turbocharged and air-to-air intercooled diesel engine has a displacement of 513.8 ci, and attains its rated RPM at 2100. The MT645D delivers a gross power of 240 horsepower, with the potential to hit a maximum power of 270 horsepower. This 4WD tractor adopts a continuously variable transmission system, paving the path for infinite forward and reverse gears. It has a hydrostatic power steering system and utilizes a closed center load sensing (CCLS) hydraulic system. The tractor's primary hitch system is a Category III type, strategically positioned at the rear. The MT645D gleams with its Quadlink Suspension feature and encases its operator within a cab-type station.

Key Specifications

Power Output: 250.8 (maximum at rated engine speed)

Transmission: CVT (combination of mechanical and hydrostatic sections)

Drive Type: 4WD

Operating Weight: 25365

Fuel Type: No. 2 Diesel

Technical Specifications

Engine

Manufacturer: Sisu Diesel
Model: -
Cooling Type: Liquid-cooled
Cylinder Orientation: -
Valve Configuration: -
Fuel Type: No. 2 Diesel
Induction Type: Turbocharged air-to-air intercooled
Cylinders: 6
Displacement (ci): 513.8
Bore (in): 4.37
Stroke (in): 5.709
Rated RPM: 1950
Power Output (hp): 250.8 (maximum at rated engine speed)

Transmission

Type: CVT (combination of mechanical and hydrostatic sections)
Forward Gears: Infinite
Reverse Gears: Infinite
Total Gears: -

Dimensions

Length (in): 215.7
Width (in): -
Height (in): 141
Operating Weight (lb): 25365

Power Take-Off (PTO)

PTO Type: -
PTO Speed 1 (rpm): -
PTO Speed 2 (rpm): -
PTO Speed 3 (rpm): -

Miscellaneous

Chassis: 4x4
Drive Type: 4WD
Steering Type: Hydrostatic power
Coolant Capacity (qts): -
Front Tire Diameter (in): -
Front Tire Width (in): -
Rear Tire Diameter (in): -
Rear Tire Width (in): -
Front/Rear Rim Diameter (in): -
Tire Type: -
Manufacture - End Year: -
Hitch Type: III
Hitch Category: III
Hitch Position: Rear
Hitch Capacity (lb): -
Operator Station Type: Cab
Starter Type: Electric
Brake Type: -
Hydraulic System Type: Closed Center Load Sensing (CCLS)

Test Results

Nebraska Tractor Test Laboratory - Test Date: January to March 2012

Maximum Power and Fuel Consumption

Maximum Power at Rated Engine Speed: 250.8 HP (187.0 kW) at 1950 rpm
Fuel Consumption at Maximum Power: 13.45 Gal/hr (50.90 l/h) with a fuel efficiency of 0.376 lb/hp.hr (0.229 kg/kW.h)
DEF Consumption at Maximum Power: 0.82 Gal/hr (3.12 l/h)

Drawbar Performance

Maximum Power at Drawbar during Turtle 7.5: 170.7 HP (127.3 kW) with a drawbar pull of 13870 lbs (61.69 kN) and a speed of 4.62 mph (7.43 km/h)
Fuel Consumption at Drawbar Turtle 7.5: 0.471 lb/hp.hr (0.286 kg/kW.h) with a fuel efficiency of 14.84 Hp.hr/gal (2.92 kW.h/l)

Torque and Engine Performance

Maximum Torque: 819 lb.-ft. (1110 Nm) at 1500 rpm
Torque Rise: 51.6% with a power increase at 1950 rpm of 16.1%

Hydraulic Performance

Maximum Force Exerted: 17850 lbs (79.4 kN) at claw type lower links and 20345 lbs (90.5 kN) at Quick hitch
Pump Delivery Rate: 46.2 GPM (174.9 l/min) at minimum pressure and 37.9 GPM (143.6 l/min) at maximum hydraulic power
Hydraulic Power: 52.6 HP (39.3 kW) at delivery pressure of 2380 psi (164 bar)

Overall Efficiency

Fuel Efficiency at Standard PTO Speed (1000 rpm): 18.66 Hp.hr/gal (3.68 kW.h/l)
Fuel Consumption at Standard PTO Speed: 13.41 Gal/hr (50.76 l/h)

Nebraska Tractor Test Lab, "Nebraska Summary: S872 Challenger MT645D" (2012). Nebraska Tractor Tests. 3049. https://digitalcommons.unl.edu/tractormuseumlit/3049