Introduction
Bolinder-Munktell BM-21 Agricultural Tractor
The Bolinder-Munktell BM-21 is a standard-tread agricultural tractor manufactured in Eskilstuna, Sweden, between 1951 and 1952. As part of the company's established series, it represents a period of post-war agricultural mechanization, prioritizing mechanical durability and functional design.
Engine and Performance
The tractor is powered by a Bolinder W5 diesel engine, a 2-cylinder, liquid-cooled unit with a displacement of 5.3 liters. It generates a rated power output of 43 hp (32.1 kW) at a governed engine speed of 1050 RPM. The engine cooling system has a capacity of 22.1 liters, while the oil system requires 10.5 liters to maintain lubrication.
Transmission and Drivetrain
The BM-21 utilizes a gear-type manual transmission offering 5 forward gears and 1 reverse gear, providing the operator with specific speed options for various field tasks. It is configured as a two-wheel drive machine and features a rear Power Take-Off (PTO) running at 540 RPM on a 1.375-inch shaft, allowing for the connection of standard implements of the era.
Dimensions and Operator Station
Designed with an open operator station and manual steering, the tractor prioritizes mechanical simplicity. It sits on a wheelbase of 80.9 inches (205 cm) with an overall length of 128 inches (325 cm). The machine weighs 5,897 lbs (2,674 kg) and is equipped with 7.50x18 front agricultural tires and 13x30 rear agricultural tires, ensuring stability for general farm work.
Electrical System
The electrical system is supported by a generator and a 24-volt electric starter motor, ensuring reliable ignition. The system utilizes four 6-volt batteries to provide the necessary current for engine starting and basic electrical operations.
Conclusion
The Bolinder-Munktell BM-21 is a robust, mechanically straightforward tractor suited for standard agricultural duties. Its design reflects the engineering standards of Swedish manufacturing in the early 1950s, making it a reliable choice for operations requiring consistent power and a simplified maintenance approach.
Production Information of Bolinder-Munktell, BM-21
- Standard-tread tractor
- Built in Eskilstuna, Sweden
| Manufacturer | Bolinder-Munktell (a part of Volvo) |
|---|
Dimension and Tires Information of Bolinder-Munktell, BM-21
| Front tread | 52.4 inches [133 cm] |
|---|---|
| Wheelbase | 80.9 inches [205 cm] |
| Height (hood) | 59.8 inches [151 cm] |
| Height (steering wheel) | 72.8 inches [184 cm] |
| Length | 128 inches [325 cm] |
| Rear tread | 57.1 inches [145 cm] |
| Weight | 5897 lbs [2674 kg] |
| Width | 71.7 inches [182 cm] |
| Ag front | 7.50x18 |
|---|---|
| Ag rear | 13x30 |
Engine Specifications of Bolinder-Munktell, BM-21
- Bolinder W5
- Liquid-cooled
- Diesel
- 2-cylinder
| Oil capacity | 11.1 qts [10.5 L] |
|---|---|
| Displacement | 323.4 ci [5.3 L] |
| Rated RPM | 1050 |
| Bore/Stroke | 5.91x5.91 inches [150 x 150 mm] |
| Coolant capacity | 23.3 qts [22.1 L] |
| Starter volts | 24 |
| Starter | Electric |
| Power | 43 hp [32.1 kW] |
Transmission Information of Bolinder-Munktell, BM-21
Transmission variants 1
| Type | Gear |
|---|---|
| Gears | 5 forward and 1 reverse |
Mechanical Specs of Bolinder-Munktell, BM-21
- Two-wheel drive
- Manual steering
- Open operator station.
Power Information of Bolinder-Munktell, BM-21
| Rear PTO Type | 540 (1.375) |
|---|
Electrical System of Bolinder-Munktell, BM-21
| Charging system | Generator |
|---|---|
| Batteries | 4 |
| Battery volts | 6 |
Where it sits
With 43 HP, the Bolinder-Munktell BM-21 sits just above BM-20 (41 HP) in Bolinder-Munktell's range. Its power puts it in the 61th percentile of 1950s models in our database (592 machines).
Frequently asked questions
How much horsepower does the Bolinder-Munktell BM-21 have?
The Bolinder-Munktell BM-21 delivers 43 HP.
What years was the Bolinder-Munktell BM-21 produced?
The Bolinder-Munktell BM-21 was produced in 1951-1952.
What engine does the Bolinder-Munktell BM-21 have?
The Bolinder-Munktell BM-21 is powered by a Diesel, 2-cylinder engine.
What transmission does the Bolinder-Munktell BM-21 use?
The Bolinder-Munktell BM-21 uses a Gear transmission.
How much does the Bolinder-Munktell BM-21 weigh?
The Bolinder-Munktell BM-21 weighs 5897 lbs [2674 kg].
Is the Bolinder-Munktell BM-21 4WD?
The Bolinder-Munktell BM-21 is available in 2WD.