Challenger MT851
Power
504 hp
Production
2021+
Engine
Turbocharged diesel, 6-cylinder
Transmission
Accu-VT
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Introduction
Challenger MT851 Agricultural Crawler Tractor
The Challenger MT851 is a high-capacity agricultural crawler tractor designed for heavy-duty field operations. Manufactured by Challenger, a brand under the AGCO group, this model belongs to the high-horsepower segment and has been in production since 2021.
Engine and Performance
The tractor is powered by a 15.3-liter, 6-cylinder, liquid-cooled turbocharged diesel engine. It delivers a gross rated power of 504.2 hp (376.0 kW) at a rated speed of 1730 RPM. The engine produces a maximum torque of 1844 lb-ft (2500.5 Nm) at 1450 RPM, providing significant pulling capacity for demanding implements. Maintenance intervals for engine oil are set at 500 hours.
Transmission and Drive
The MT851 utilizes the Accu-VT continuously variable transmission (CVT). This system allows for infinite speed adjustment in both forward and reverse directions, eliminating the need for traditional gear shifting and enabling precise speed control for varied agricultural applications.
Hydraulics and PTO
The hydraulic system features a closed-center, pressure-flow compensated design, which ensures efficiency by delivering oil only when required. The standard pump flow capacity is 58.1 gpm (219.9 lpm) at a system pressure of 2900 psi (200.0 bar), with an optional capacity of 116.2 gpm. It is equipped with 4 to 8 rear valves and an independent rear PTO offering 1000/1000E speeds.
Dimensions and Operator Environment
With a operating weight of 42,000 lbs (19,051 kg) and a wheelbase of 118 inches (299 cm), the tractor is configured as a crawler to maximize ground contact and traction. The operator station consists of a standard cab equipped with air-conditioning to maintain environmental control during operation.
Conclusion
The Challenger MT851 is engineered for large-scale farming operations requiring high tractive effort and precise speed management. Its combination of a high-torque diesel engine, CVT transmission, and robust hydraulic system makes it suitable for intensive tillage and heavy draft tasks.
Production Information of Challenger, MT851
- Agricultural Crawler tractor
| Manufacturer | Challenger (a part of AGCO) |
|---|
Engine Specifications of Challenger, MT851
- Liquid-cooled inline
- Turbocharged diesel
- 6-cylinder
| Starter | Electric |
|---|---|
| Displacement | 933.7 ci [15.3 L] |
| Rated RPM | 1730 |
| Bore/Stroke | 5.43x6.69 inches [138 x 170 mm] |
| Oil change | 500 h |
| Starter volts | 24 |
| Torque RPM | 1450 |
| Torque | 1844 lb-ft [2500.5 Nm] |
| Rated Power (gross) | 504.2 hp [376.0 kW] |
Transmission Information of Challenger, MT851
Transmission variants 1
| Transmission | Accu-VT |
|---|---|
| Type | Continuously-variable transmission |
| Gears | Infinite forward and reverse |
Mechanical Specs of Challenger, MT851
- Cab standard with air-conditioning.
| Drive | Crawler |
|---|
Power Information of Challenger, MT851
| Rear PTO | Independent |
|---|---|
| Rear PTO Type | 1000/1000E |
Hydraulics Specifications of Challenger, MT851
| Type | Closed center pressure-flow compensated |
|---|---|
| Type(optional) | 116.2 gpm [439.8 lpm] |
| Pump flow | 58.1 gpm [219.9 lpm] |
| Pressure | 2900 psi [200.0 bar] |
| Rear valves | 4 to 8 |
Electrical System of Challenger, MT851
| Ground | Negative |
|---|---|
| Battery volts | 12 |
| Batteries | 3 |
| Charging system | Alternator |
| Charging amps | 325 |
Where it sits
With 504 HP, the Challenger MT851 sits between MT845E (450 HP) and MT856 (556 HP) in Challenger's range. Its power puts it in the 96th percentile of 2020s models in our database (1464 machines).
Frequently asked questions
How much horsepower does the Challenger MT851 have?
The Challenger MT851 delivers 504 HP.
What years was the Challenger MT851 produced?
The Challenger MT851 was produced in 2021+.
What engine does the Challenger MT851 have?
The Challenger MT851 is powered by a Turbocharged diesel, 6-cylinder engine.
What transmission does the Challenger MT851 use?
The Challenger MT851 uses a Accu-VT transmission.