Challenger MT975B

Last Updated: July 2024

Overview

The Challenger MT975B is powered by a 584.72 hp Caterpillar C18 turbocharged and air-to-air aftercooled diesel engine with 6 inline cylinders and a compression ratio of 16.3:1. It has a selective gear fixed ratio transmission with full power shift control offering 16 forward and 4 reverse gears. Key specs include 298 in length, 200 in width, operating weight of 59,820 lbs with ballast (50,710 lbs without). The brakes are wet multiple disc hydraulically actuated. Detailed performance data from independent testing is included for drawbar pull, hydraulics, PTO, torque, and more.

Key Specifications

Power Output: 584.72

Transmission: selective gear fixed ratio with full range operator controlled power shift

Operating Weight: 59820 with ballast; 50710 without ballast

Fuel Type: diesel

Image Gallery

Challenger MT975B Tractor

Technical Specifications

Engine

Manufacturer: Caterpillar
Model: C18
Cooling Type: liquid-cooled
Cylinder Orientation: inline
Valve Configuration: 24-valve
Fuel Type: diesel
Induction Type: Turbocharged / Air-to-Air Aftercooled
Cylinders: 6
Displacement (ci): 1105
Bore (in): 5.709
Stroke (in): 7.205
Rated RPM: 2100
Power Output (hp): 584.72

Transmission

Type: selective gear fixed ratio with full range operator controlled power shift
Forward Gears: 16
Reverse Gears: 4
Total Gears: -

Dimensions

Length (in): 298
Width (in): 200
Height (in): 151
Operating Weight (lb): 59820 with ballast; 50710 without ballast

Power Take-Off (PTO)

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

Miscellaneous

Chassis: -
Drive Type: -
Steering Type: -
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: -
Hitch Category: IVN/III Opt
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: -
Starter Type: -
Brake Type: wet multiple disc hydraulically actuated foot pedal
Hydraulic System Type: closed center PFC

Test Results

Nebraska Tractor Test Laboratory - Test Date: June 6 - 20, 2008

Maximum Power and Fuel Consumption

Maximum Power: 584.72 HP (436.03 kW) at 1750 rpm
Fuel Consumption at Maximum Power: 32.91 Gal/hr (124.60 l/h) with a fuel efficiency of 0.394 lb/hp.hr (0.240 kg/kW.h)
Standard Power Take-off Speed (1000 rpm): 552.37 HP (411.90 kW) at 2000 rpm with 33.82 Gal/hr (128.04 l/h)

Drawbar Performance

Power at Maximum Power (8th Gear): 466.08 HP (347.56 kW) with a drawbar pull of 32089 lbs (142.74 kN) and a speed of 5.45 mph (8.77 km/h)
Fuel Consumption at Maximum Power (8th Gear): 0.500 lb/hp.hr (0.304 kg/kW.h) with a fuel efficiency of 14.02 Hp.hr/gal (2.76 kW.h/l)
75% of Pull at Reduced Engine Speed (11th Gear): 368.96 HP (275.13 kW) with a drawbar pull of 24065 lbs (107.05 kN) and a speed of 5.75 mph (9.25 km/h)

Torque and Engine Performance

Maximum Torque: 2010 lb.-ft. (2725 Nm) at 1297 rpm
Torque Rise: 55.1%
Power Increase at 1750 rpm: 12.8%

Hydraulic Performance

Maximum Force Exerted: Not available
Pump Delivery Rate (Standard Pump): 43.7 GPM (165.6 l/min) at minimum pressure and rated engine speed
Hydraulic Power (Standard Pump): 66.4 HP (49.5 kW) at delivery pressure of 2761 psi (190 bar)

NTTL.(2008).Nebraska OECD Tractor Test 1931 for Challenger MT975B Diesel. Lincoln, NE:Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/2328