Challenger MT685D

Last Updated: July 2024

Overview

The Challenger MT685D is a robust 4WD tractor with a hydrostatic power steering system. It is powered by a Sisu Diesel 6-cylinder turbocharged and intercooled engine producing 333.2 hp and 1042 lb-ft of torque. The liquid-cooled engine utilizes a thermostat and variable speed fan. The continuously variable transmission has two mechanical ranges with infinite speed adjustment between 0-25 mph forward and 0-12 mph reverse. Key hydraulic specs include pump delivery rates up to 46.2 GPM. It has multiple wet disc brakes hydraulically operated by foot pedals. Dimensions include a 122.2" wheelbase, height of 141", and operating weight of 25,365 lbs. Additional details cover tire sizes/pressures, PTO speed, noise level, and use of diesel exhaust fluid.

Key Specifications

Power Output: 333.2

Transmission: continuously variable transmission

Drive Type: 4WD

Operating Weight: 25365

Fuel Type: diesel

Technical Specifications

Engine

Manufacturer: Sisu Diesel
Model: -
Cooling Type: liquid-cooled
Cylinder Orientation: -
Valve Configuration: -
Fuel Type: diesel
Induction Type: turbocharged air-to-air intercooled
Cylinders: 6
Displacement (ci): 513.8
Bore (in): 4.37
Stroke (in): 5.709
Rated RPM: 2100
Power Output (hp): 333.2

Transmission

Type: continuously variable transmission
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: 4WD
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: Standard tires (ag)
Manufacture - End Year: -
Hitch Type: Cat III
Hitch Category: Cat 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 July, 2012

Maximum Power and Fuel Consumption

Maximum Power: 333.2 HP (248.5 kW) at 1950 rpm
Fuel Consumption at Maximum Power: 17.65 Gal/hr (66.82 l/h) with a fuel efficiency of 0.372 lb/hp.hr (0.226 kg/kW.h)
DEF Consumption at Maximum Power: 1.21 Gal/hr (4.59 l/h)

Drawbar Performance

Maximum Drawbar Power: 268.7 HP (200.4 kW) with a drawbar pull of 15905 lbs (70.76 kN) at 6.34 mph (10.20 km/h)
Fuel Consumption at Maximum Drawbar Power: 0.447 lb/hp.hr (0.272 kg/kW.h) with a fuel efficiency of 15.48 Hp.hr/gal (3.05 kW.h/l)

Torque and Engine Performance

Maximum Torque: 1042 lb.-ft. (1413 Nm) at 1500 rpm
Torque Rise: 36.5% with a power increase at 1950 rpm of 9.1%

Hydraulic Performance

Maximum Force Exerted: 20345 lbs (90.5 kN) at hitch points with Quick Hitch
Pump Delivery Rate: 46.2 GPM (174.9 l/min) at minimum pressure and rated engine speed
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): 18.78 Hp.hr/gal (3.70 kW.h/l)
Fuel Consumption: 17.62 Gal/hr (66.69 l/h) at 1967 rpm

Nebraska Tractor Test Lab.(2012). Nebraska Summary: S876 Challenger MT685D. Lincoln, NE: Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/3037