Challenger MT645E

Last Updated: July 2024

Overview

The Challenger MT645E is a powerful and robust tractor, with a tested maximum power output of 242.6 hp at 2100 rated engine rpm. The tractor model features a hydrostatic power steering system and a Techstar CVT (Continuously Variable transmission) with infinite gears in both forward and reverse (2-range). The engine, produced by AGCO POWER, is a 6-cylinder, 24-valve model with a displacement of 513 cu in, bore of 4.37 inches, and stroke of 5.709 inches. It is turbocharged with an air-to-air intercooler and cooled by a liquid system. The operational weight of the MT645E is 24670 lbs, and its overall length and height are 218.6 inches and 141 inches, respectively. The tractor features a rear hitch of III/IVN category with a maximum force exerted of 22,460 lbs at the hitch points. This tractor's emission control is achieved through selective catalytic reduction (SCR) with a DEF consumption of 0.74 Gal/hr at maximum power. The hydraulic system is a closed center load sensing (CCLS) type with a pump delivery rate of 53.1 GPM at minimum pressure and rated engine speed, providing 67.3 HP of hydraulic power at 2885 psi delivery pressure.

Key Specifications

Power Output: 242.6

Transmission: Techstar CVT (Continuously Variable transmission)

Operating Weight: 24670

Fuel Type: Diesel

Technical Specifications

Engine

Manufacturer: AGCO POWER
Model: -
Cooling Type: Liquid-cooled
Cylinder Orientation: -
Valve Configuration: 24-valve
Fuel Type: Diesel
Induction Type: Turbocharged with air-to-air intercooler
Cylinders: 6
Displacement (ci): 513.0
Bore (in): 4.37
Stroke (in): 5.709
Rated RPM: 2100
Power Output (hp): 242.6

Transmission

Type: Techstar CVT (Continuously Variable transmission)
Forward Gears: Infinite (2-range)
Reverse Gears: Infinite (2-range)
Total Gears: -

Dimensions

Length (in): 218.6
Width (in): -
Height (in): 141
Operating Weight (lb): 24670

Power Take-Off (PTO)

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

Miscellaneous

Chassis: -
Drive Type: -
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: Rear Hitch
Hitch Category: III / IVN
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 - Challenger MT645E Diesel

Maximum Power and Fuel Consumption

Maximum Power: 217.8 HP (162.4 kW) at 2098 rpm
Fuel Consumption at Maximum Power: 12.88 Gal/hr (48.76 l/h) with a fuel efficiency of 0.413 lb/hp.hr (0.251 kg/kW.h)
DEF Consumption: 0.74 Gal/hr (2.80 l/h)

Drawbar Performance

Maximum Drawbar Power: 184.7 HP (137.7 kW) with a drawbar pull of 14,075 lbs (62.6 kN) at speed of 4.92 mph (7.92 km/h)
Fuel Consumption at Maximum Drawbar Power: 13.27 Gal/hr (50.24 l/h) with a fuel efficiency of 0.702 lb/hp.hr (0.427 kg/kW.h)

Torque and Engine Performance

Maximum Torque: 790 lb.-ft. (1071 Nm) at 1200 rpm
Torque Rise: 44.8% with a torque rise at 1700 engine rpm of 35% and a power increase at 1950 engine rpm of 11.4%

Hydraulic Performance

Maximum Force Exerted: 22,460 lbs (99.9 kN) at hitch points
Pump Delivery Rate: 53.1 GPM (201.1 l/min) at minimum pressure and rated engine speed
Hydraulic Power: 67.3 HP (50.2 kW) at delivery pressure of 2885 psi (199 bar)

Overall Efficiency

Fuel Efficiency at Standard PTO Speed (1000 rpm): 16.91 Hp.hr/gal (3.33 kW.h/l)
Fuel Consumption during Varying Load: 11.42 Gal/hr (43.22 l/h) at 50% load with a fuel efficiency of 0.50 lb/hp.hr (0.19 kg/kW.h)

NTTL.(2015). Nebraska Summary: S994 Challenger MT645E Diesel. Lincoln, NE: Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/3302