Challenger MT645B
Power
235 hp
Production
2005-2008
Engine
Turbocharged diesel, 6-cylinder 24-valve
Transmission
TechStar
Drive
4WD
From the same series:
Introduction
Challenger MT645B Row-Crop Tractor
The Challenger MT645B is a high-capacity row-crop tractor manufactured in Beauvais, France, between 2005 and 2008. Designed for heavy-duty agricultural operations, this model integrates advanced powertrain technology with a focus on operator comfort and field versatility.
Engine and Powertrain
The tractor is equipped with a Sisu 74ETA 6-cylinder, 24-valve turbocharged diesel engine. With a displacement of 7.4 liters, it produces a rated power of 235 hp (175.2 kW) at 2200 RPM. The engine cooling system utilizes a liquid-cooled vertical inline configuration. Power is transmitted through a TechStar continuously variable transmission (CVT), which provides infinite forward and reverse speeds across two ranges, managed by an electro-hydraulic wet disc clutch.
Hydraulics and PTO
The hydraulic system utilizes pressure flow compensated (PFC) technology, delivering a total flow rate of 39 gpm (147.6 lpm) at a system pressure of 2900 psi (200 bar). It supports between four and six valves for implement control. The independent rear PTO offers multiple speed settings, including 540, 540E, and 1000 RPM, selectable via electro-hydraulic engagement.
Mechanical and Dimensions
Built on a 121.1-inch (307 cm) wheelbase, the MT645B features a standard four-wheel drive system with electro-hydraulic differential locks on both the front and rear axles. Stopping power is provided by hydraulic wet disc brakes. The tractor's dimensions include a ground clearance of 22.4 inches (56 cm) and a cab height of 123.6 inches (313 cm), ensuring stability for row-crop applications.
Hitch and Lift Capacity
The machine is equipped with a Category III rear hitch, capable of lifting 15,600 lbs (7076 kg) at 24 inches behind the lift point. An optional front hitch is available, which provides a front lift capacity of 7,700 lbs (3492 kg) to support additional front-mounted implements.
Conclusion
The Challenger MT645B is engineered for professional agricultural environments requiring high torque and precise speed control. Its combination of a CVT transmission, robust PFC hydraulics, and substantial lift capacities makes it a suitable choice for demanding row-crop tasks and heavy implement management.
Production Information of Challenger, MT645B
- Row-Crop tractor
- Built in Beauvais, France
| Manufacturer | Challenger (a part of AGCO) |
|---|
Dimension and Tires Information of Challenger, MT645B
| Rear tread | 60 to 88 inches [152 to 223 cm] |
|---|---|
| Wheelbase | 121.1 inches [307 cm] |
| Ground clearance | 22.4 inches [56 cm] |
| Height (cab) | 123.6 inches [313 cm] |
| Length | 206 inches [523 cm] |
| Bar rear axle | 4.33 by 118 inches [109 by 2997 mm] |
| Width | 118 inches [299 cm] |
| Ag front | 380/85R34 |
|---|---|
| Ag rear | 480/80R46 |
Engine Specifications of Challenger, MT645B
- Sisu 74ETA
- Liquid-cooled vertical inline
- 6-cylinder 24-valve
- Turbocharged diesel
| Air cleaner | Dual paper elements |
|---|---|
| Rated RPM | 2200 |
| Displacement | 449 ci [7.4 L] |
| Bore/Stroke | 4.251x5.278 inches [108 x 134 mm] |
| Power | 235 hp [175.2 kW] |
| Compression | 17.5:1 |
| Pre-heating(optional) | 1000W coolant heater |
| Coolant capacity | 35.6 qts [33.7 L] |
| Oil capacity | 20 qts [18.9 L] |
| Starter volts | 12 |
Transmission Information of Challenger, MT645B
Transmission variants 1
| Transmission | TechStar |
|---|---|
| Oil capacity | 70.8 qts [67.0 L] |
| Type | Continuously variable transmission (CVT) |
| Gears | Infinite forward and reverse (2-range) |
Mechanical Specs of Challenger, MT645B
- Cab standard with heat and A/C. Optional pneumatic cab suspension and automatic climate control.
- Four-wheel drive
- Hydraulic wet disc brakes
- Power steering
| Final drives | Inboard planetary |
|---|---|
| Trailer brakes(optional) | Hydraulic |
| Differential lock | Electrohydraulic front and rear |
Power Information of Challenger, MT645B
| Engine RPM | 540@2037 |
|---|---|
| Rear PTO | Independent |
| Rear PTO(optional) | 1000 (1.375) |
| Rear PTO(optional) | 540/540E |
| Clutch | Electro-hydraulic wet disc |
| Clutch(optional) | 540E@ 1598 |
| Clutch(optional) | 1000 (1.75) |
| Rear PTO Type | 540 (1.375) |
| Rear PTO Type(optional) | 1000@2031 |
Hydraulics Specifications of Challenger, MT645B
| Type | Pressure flow compensated (PFC) |
|---|---|
| Total flow | 39 gpm [147.6 lpm] |
| Valves | 4 to 6 |
| Capacity | 26.4 gal [99.9 L] |
| Pressure | 2900 psi [200.0 bar] |
Three-Point Hitch of Challenger, MT645B
| Rear Type | III |
|---|---|
| Rear Type(optional) | 12,100 lbs [5488 kg] |
| Front lift | 7,700 lbs [3492 kg] |
| Rear lift (at 24"/610mm) | 15,600 lbs [7076 kg] |
| Front Hitch(optional) | II |
Electrical System of Challenger, MT645B
| Ground | Negative |
|---|---|
| Battery CCA | 775 |
| Batteries | 2 |
| Charging system | Alternator |
| Battery volts | 12 |
| Charging amps | 150 |
Where it sits
With 235 HP, the Challenger MT645B sits between MT635B (215 HP) and MT645C (240 HP) in Challenger's range. Its power puts it in the 90th percentile of 2000s models in our database (2822 machines).
Frequently asked questions
How much horsepower does the Challenger MT645B have?
The Challenger MT645B delivers 235 HP.
What years was the Challenger MT645B produced?
The Challenger MT645B was produced in 2005-2008.
What engine does the Challenger MT645B have?
The Challenger MT645B is powered by a Turbocharged diesel, 6-cylinder 24-valve engine.
What transmission does the Challenger MT645B use?
The Challenger MT645B uses a TechStar transmission.
Is the Challenger MT645B 4WD?
The Challenger MT645B is available in 4WD.