| Manufacturer | Challenger |
| Price | - |
| Model | MT645B |
| Equipment Type | Row-Crop Tractors |
| Factory | Beauvais, France |
ENGINE DETAIL
The Challenger MT645B tractor features a robust Sisu 74ETA turbocharged diesel engine with a high compression ratio of 17.5:1, enhancing fuel efficiency and torque delivery, ideal for heavy-duty applications. It operates efficiently at a rated RPM of 2200, delivering a notable 235 hp, suitable for tasks requiring significant power output, such as plowing and hauling. However, its coolant and oil capacities, at 35.6 qts and 20 qts respectively, necessitate careful maintenance to prevent overheating and ensure optimal performance over extended operation periods.
| Description | Sisu 74ETA turbocharged diesel 6-cylinder 24-valve liquid-cooled vertical inline |
| Displacemen | 449ci / 7.4L |
| Bore/Strok | 4.251x5.278inches / 108x 134 mm |
| Powe | 235hp / 175.2kW |
| Air cleane | dual paper elements |
| Pre-heatin | 1000W coolant heater OptOptional |
| Compressio | 17.5:1 |
| Rated RP | 2200 |
| Starter volt | 12 |
| Oil capacit | 20qts / 18.9L |
| Coolant capacit | 35.6qts / 33.7L |
CHALLENGER MT645B ENGINE
The Challenger MT645B features a robust Sisu 7.4L 6-cylinder diesel engine, delivering a solid power-to-weight ratio for efficient performance in diverse agricultural tasks. This engine is known for its durability and torque characteristics, providing optimal fuel efficiency during heavy-duty operations. However, engine maintenance may be complex, requiring specialized knowledge and parts availability, which could pose a challenge in remote areas.
| Description | Sisu 7.4L 6-cyl diesel |
TRANSMISSION
The Challenger MT645B features a TechStar continuously variable transmission (CVT) that offers infinite forward and reverse gearing, enhancing operational flexibility for various field applications. With an oil capacity of 70.8 quarts, efficient lubrication is maintained, which is crucial for prolonged transmission life and optimal performance under heavy loads. This configuration is ideal for tasks requiring precise speed and torque management, such as tilling or planting.
| Transmissio | TechStar |
| Typ | continuously variable transmission (CVT) |
| Gear | infinite forward and reverse (2-range) |
| Oil capacit | 70.8qts / 67.0L |
CHALLENGER MT645B TRANSMISSION
The Challenger MT645B features a continuously variable transmission (CVT), offering seamless speed variations and improved fuel efficiency, ideal for diverse agricultural applications. This transmission enhances operator comfort by eliminating drastic gear shifts, thus facilitating smooth power delivery for tasks such as tillage and planting. However, potential challenges may include higher maintenance costs and a learning curve for operators unfamiliar with CVT systems.
| Description | continuously variable transmission (CVT) |
MECHANICAL
The Challenger MT645B is a robust four-wheel-drive tractor that enhances maneuverability and traction, making it ideal for demanding terrains. Its inboard planetary final drive contributes to improved efficiency and reduced maintenance, while the electrohydraulic differential lock optimizes wheel traction during adverse conditions. The optional pneumatic cab suspension and automatic climate control enhance operator comfort, crucial for long-duration tasks in varying weather conditions.
| Description | Four-wheel drive Power steering Hydraulic wet disc brakes Cab standard with heat and A/C. Optional pneumatic cab suspension and automatic climate control. |
| Final drive | inboard planetary |
| Differential loc | electrohydraulic front and rear |
| Trailer brake | hydraulic OptOptional |
CAPACITY
| Fue | 159gal / 601.8L |
| Hydraulic syste | 26.4gal / 99.9L |
HYDRAULICS
| Typ | pressure flow compensated (PFC) |
| Capacit | 26.4gal / 99.9L |
| Pressur | 2900psi / 200.0bar |
| Valve | 4 to 6 |
| Total flo | 39gpm / 147.6lpm |
TRACTOR HITCH
| Rear Typ | III |
| Rear lift (at 24 | 15,600lbs / 7076kg |
| Front Hitc | II OptOptional |
| Front lif | 7,700lbs / 3492kg/12,100lbsOptOptional / 5488kg |
POWER TAKE-OFF (PTO)
| Rear PT | independent |
| Clutc | electro-hydraulic wet disc |
| Rear RP | 540 (1.375)/540/540E OptOptional/1000 (1.375)/1000 (1.75) |
| Engine RP | 540@2037 / 540E@ 1598 / 1000@2031 |
CHALLENGER MT645B TIRES
The Challenger MT645B features a robust power output with a 380/85R34 front tire and a 480/80R46 rear tire, providing enhanced traction and stability in agricultural operations. The tire sizes offer a balance of flotation and soil preservation, which is crucial when working on softer terrains. However, challenges may arise in tight spaces due to the larger dimensions, necessitating careful maneuvering in confined fields or barns.
| Ag fron | 380/85R34 |
| Ag rea | 480/80R46 |
DIMENSIONS & TIRES
The Challenger MT645B tractor features a wheelbase of 121.1 inches, which provides stability during operation, particularly in demanding terrains. Weighing between 18,308 to 19,595 pounds, it demonstrates substantial ground contact for effective traction, though its weight may challenge maneuverability in tighter spaces. The tire sizes (380/85R34 front and 480/80R46 rear) suggest a focus on both flotation and grip, advantageous for heavy pulling applications in soft soil conditions.
| Wheelbas | 121.1inches / 307cm |
| Weigh | 18308 to 19595 pounds |
| Front tir | 380/85R34 |
| Rear tir | 480/80R46 |
ELECTRICAL
| Groun | negative |
| Charging syste | alternator |
| Charging amp | 150 |
| Batterie | 2 |
| Battery CC | 775 |
| Battery volt | 12 |