Challenger MT845C

Last Updated: July 2024

Overview

The Challenger MT845C is a powerful and efficient tractor equipped with a Caterpillar C15 ACERT engine that delivers a maximum power output of 442.53 HP at 1700 rpm. This 6-cylinder, 24-valve, turbocharged and aftercooled diesel engine has a displacement of 928 cubic inches, a bore of 5.402 inches, and a stroke of 6.752 inches, with a compression ratio of 18.0 to 1. The tractor features a full power shift transmission with 16 forward and 4 reverse gears, and a speed sensitive differential steering system. It has a tracklayer-rubber tracked chassis with a length of 270 inches and a width ranging from 100.0 to 120.0 inches. The operating weight is 43,380 lbs unballasted and 50,000 lbs ballasted. The MT845C boasts impressive performance metrics, including a maximum torque of 1511 lb.-ft. at 1051 rpm, a torque rise of 54.6%, and a power increase of 13.2% at 1700 rpm. The hydraulic system features a standard pump with a sustained pressure of 2943 psi and a delivery rate of 44.5 GPM, as well as a high-flow pump with a sustained pressure of 2856 psi and a delivery rate of 62.8 GPM. The tractor is equipped with wet multiple disc brakes hydraulically actuated by a foot pedal and a 1000 rpm PTO at 1980 engine rpm.

Key Specifications

Power Output: 442.53

Transmission: Full power shift

Operating Weight: 43,380 (unballasted), 50,000 (ballasted)

Fuel Type: Diesel

Technical Specifications

Engine

Manufacturer: Caterpillar
Model: C15 ACERT
Cooling Type: Liquid-cooled
Cylinder Orientation: -
Valve Configuration: 24-valve
Fuel Type: Diesel
Induction Type: Turbocharged and aftercooled
Cylinders: 6
Displacement (ci): 928
Bore (in): 5.402
Stroke (in): 6.752
Rated RPM: 2100
Power Output (hp): 442.53

Transmission

Type: Full power shift
Forward Gears: 16
Reverse Gears: 4
Total Gears: -

Dimensions

Length (in): 270
Width (in): 100.0 to 120.0
Height (in): 138.1
Operating Weight (lb): 43,380 (unballasted), 50,000 (ballasted)

Power Take-Off (PTO)

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

Miscellaneous

Chassis: -
Drive Type: -
Steering Type: Speed sensitive differential
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: III/IVN
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: -
Starter Type: Electric
Brake Type: Hydraulic wet discs
Hydraulic System Type: Closed center pressure-flow compensated

Test Results

Nebraska Tractor Test Laboratory - Test Date: May 12 - 20, 2009

Maximum Power and Fuel Consumption

Maximum Power (1 hour): 442.53 HP (329.99 kW) at 1700 rpm
Fuel Consumption at Maximum Power: 24.82 Gal/hr (93.95 l/h) with a fuel efficiency of 0.395 lb/hp.hr (0.241 kg/kW.h)
Standard Power Take-off Speed: 417.21 HP (311.11 kW) at 1980 rpm with a fuel consumption of 24.84 Gal/hr (94.03 l/h) and fuel efficiency of 0.420 lb/hp.hr (0.255 kg/kW.h)

Drawbar Performance

Maximum Power in 6th Gear: 331.68 HP (247.33 kW) with a drawbar pull of 27840 lbs (123.84 kN) and a speed of 4.47 mph (7.19 km/h)
Fuel Consumption at Maximum Power (6th Gear): 0.513 lb/hp.hr (0.312 kg/kW.h) with a fuel efficiency of 13.76 Hp.hr/gal (2.71 kW.h/l)

Torque and Engine Performance

Maximum Torque: 1511 lb.-ft. (2048 Nm) at 1051 rpm
Torque Rise: 54.6% with a power increase at 1700 rpm of 13.2%

Hydraulic Performance

Maximum Force Exerted: 20936 lbs (93.1 kN) through the whole range
Pump Delivery Rate (Standard Pump): 44.5 GPM (168.5 l/min) at minimum pressure and rated engine speed
Hydraulic Power (Standard Pump): 67.5 HP (50.4 kW) at delivery pressure of 2692 psi (186 bar)

Overall Efficiency

Fuel Efficiency at Standard PTO Speed (1000 rpm): 16.80 Hp.hr/gal (3.31 kW.h/l)
Fuel Consumption: 24.84 Gal/hr (94.03 l/h) at 1980 rpm

Nebraska Tractor Test Lab.(2009).Test 1953: Challenger MT845C Diesel. University of Nebraska - Lincoln. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/2346