Challenger MT855B

Last Updated: July 2024

Overview

The Challenger MT855B is a powerful tractor designed for demanding work environments. Equipped with a Caterpillar C15 ACERT engine, this model boasts a maximum power output of 465.26 horsepower at 1699 rpm and a displacement capacity of 928 cubic inches. The engine structure comprises 6 in-line cylinders cooled through a liquid mechanism with a compression ratio of 16.5 to 1. The tractor's 24-valve arrangement ensures efficient fuel combustion, contributing to its superior performance. The engine produces a maximum torque of 1585 lb-ft at 1449 rpm with a torque rise of 53.8%. The tractor uses No. 2 Diesel fuel type and is turbocharged with air-to-air aftercooling. It has a Powershift transmission type hosting 16 forward and 4 reverse gears. Measuring 265.9 inches in length, with a width range of 100.0" to 120.0", and 138.1 inches in height, the MT855B holds an operating weight of 41800 lbs. The tractor features a tracklayer-rubber tracked chassis, wet multiple disc hydraulically actuated clutch and brakes, and electro-hydraulic differential steering controlled by a steering wheel. It has a power take-off of 1000 rpm at 1980 engine rpm and a drawbar height of 19.5 inches. The maximum drawbar pull is 30181 lbs. The hydraulic system provides a maximum force exerted of 20936 lbs, a pump delivery rate of 59.0 GPM, and a hydraulic power of 82.6 HP at a delivery pressure of 2479 psi.

Key Specifications

Power Output: 465.26

Transmission: Powershift

Operating Weight: 41800

Fuel Type: No. 2 Diesel

Image Gallery

Challenger MT855B Tractor

Technical Specifications

Engine

Manufacturer: Caterpillar
Model: C15 ACERT
Cooling Type: liquid-cooled
Cylinder Orientation: inline
Valve Configuration: 24-valve
Fuel Type: No. 2 Diesel
Induction Type: Turbocharged and Air-to-Air Aftercooled
Cylinders: 6
Displacement (ci): 928
Bore (in): 5.402
Stroke (in): 6.752
Rated RPM: 2100
Power Output (hp): 465.26

Transmission

Type: Powershift
Forward Gears: 16
Reverse Gears: 4
Total Gears: -

Dimensions

Length (in): 265.9
Width (in): 100.0 to 120.0
Height (in): 138.1
Operating Weight (lb): 41800

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: optional
Hitch Category: III/IVN
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: -
Starter Type: 12 volt
Brake Type: -
Hydraulic System Type: Closed Center PFC

Test Results

Nebraska Tractor Test Laboratory - Test Date: October 6 to 21, 2005

Maximum Power and Fuel Consumption

Maximum Power (1 hour): 465.26 HP (346.95 kW) at 1699 rpm
Fuel Consumption at Rated Engine Speed (2100 rpm): 24.53 Gal/hr (92.86 l/h) with a fuel efficiency of 0.420 lb/hp.hr (0.255 kg/kW.h) and 16.81 Hp.hr/gal (3.31 kW.h/l)
Fuel Consumption at Standard PTO Speed (1980 rpm): 25.62 Gal/hr (96.97 l/h) with a fuel efficiency of 0.407 lb/hp.hr (0.247 kg/kW.h) and 17.34 Hp.hr/gal (3.42 kW.h/l)

Drawbar Performance

Maximum Power in 6th Gear: 358.14 HP (267.07 kW) with a drawbar pull of 30181 lbs (134.25 kN), speed of 4.45 mph (7.16 km/h), and fuel efficiency of 0.471 lb/hp.hr (0.286 kg/kW.h) with 14.98 Hp.hr/gal (2.95 kW.h/l)
50% of Pull at Maximum Power in 6th Gear: 192.49 HP (143.54 kW) with a drawbar pull of 15051 lbs (66.95 kN) and a speed of 4.80 mph (7.72 km/h), fuel consumption of 0.662 lb/hp.hr (0.403 kg/kW.h) with a fuel efficiency of 10.65 Hp.hr/gal (2.10 kW.h/l)

Torque and Engine Performance

Maximum Torque: 1585 lb.-ft. (2149 Nm) at 1449 rpm
Torque Rise: 53.8% with a power increase at 1700 rpm of 39%

Hydraulic Performance

Maximum Force Exerted: 20936 lbs (93.1 kN)
Pump Delivery Rate at Rated Engine Speed: 44.5 GPM (168.5 l/min) at minimum pressure
Hydraulic Power: 67.5 HP (50.4 kW) at delivery pressure of 2692 psi (186 bar)

Sound Level

Tractor Sound Level with Cab: 76.5 dB(A) at no load in 6th gear

NTTL. (2005). Nebraska OECD Tractor test 1862 for Challenger MT855B Diesel. Lincoln, NE: Nebraska Tractor Test Laboratory. Retrieved from DigitalCommons@University of Nebraska - Lincoln