Bolinder-Munktell BM-21

The Bolinder-Munktell BM-21 is a tractor produced by Bolinder Munktell. It is equipped with a 323.4 ci 5.3 L engine. The listed engine power is Diesel (listed): 43 hp / 32.1 kW. Transmission: 5 forward and 1 reverse. Operating weight: 5897 lbs 2674 kg.

Engine Power

Diesel (listed): 43 hp / 32.1 kW

Fuel & Capacities

19.8 gal 74.9 L

Transmission

5 forward and 1 reverse

Operating Weight

5897 lbs 2674 kg

Overview

	1951 - 1952 Standard-tread tractor

Production
Manufacturer	Bolinder-Munktell (a part of Volvo)
Standard-tread tractor
Built in Eskilstuna, Sweden

Bolinder-Munktell BM-21 Engine
Bolinder 5.3L 2-cyl diesel
Fuel tank	19.8 gal 74.9 L
Engine details ...

Bolinder-Munktell BM-21 Transmission
5-speed gear
Transmission details ...

Bolinder-Munktell BM-21 Power
Engine	43 hp 32.1 kW

Mechanical
Two-wheel drive
Manual steering
Open operator station.

Power Take-off (PTO)
Rear PTO Type	540 (1.375)

Dimensions & Tires
Wheelbase	80.9 inches 205 cm
Weight	5897 lbs 2674 kg
Front tire	7.50x18
Rear tire	13x30
Full dimensions and tires ...

Electrical
Charging system	generator
Batteries	4
Battery volts	6

Engine

Engine Detail — 323.4 ci / 5.3 L Diesel

Manufacturer	Bolinder W5
Fuel Type	Diesel
Configuration	2-cylinder, liquid-cooled
Displacement	323.4 ci 5.3 L
Bore/Stroke	5.91x5.91 inches 150 x 150 mm
Power	43 hp 32.1 kW
Rated RPM	1050
Starter	electric
Starter volts	24
Oil capacity	11.1 qts 10.5 L
Coolant capacity	23.3 qts 22.1 L

Transmission

Transmission — 5 forward and 1 reverse gear

Type	gear
Gears	5 forward and 1 reverse

Dimensions

Bolinder-Munktell BM-21 Tires
Ag front	7.50x18
Ag rear	13x30

Dimensions
Wheelbase	80.9 inches 205 cm
Length	128 inches 325 cm
Width	71.7 inches 182 cm
Height (steering wheel)	72.8 inches 184 cm
Height (hood)	59.8 inches 151 cm
Weight	5897 lbs 2674 kg
Front tread	52.4 inches 133 cm
Rear tread	57.1 inches 145 cm

Photos

Bolinder-Munktell BM-21 tractor photo

Recommended Implements & Sizing Guide

Engineering recommendations for Bolinder Munktell Bolinder-Munktell BM-21 based on its 43 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm)	Medium Duty	Standard utility farm tillage.
Rotary Cutter / MowerMowing & Clearing	6 ft (72 in)1.8 m	Medium Duty	Medium pasture clearing; rear slip-clutch recommended.
Rotary TillerSeedbed Prep	66 to 72 in165 - 180 cm	Medium Duty	Standard utility tiller; slip clutch protection required.
Disc HarrowSecondary Tillage	7 to 8 ft Tandem Disc2.1 - 2.4 m 对开双排耙	Medium Duty	Field leveling and clod breaking behind plows.
Hay BalerHay & Forage	Small Square Baler (14x18")小方捆打捆机 (36x46 cm)	Medium Duty	Classic 2-string baler for horse and small livestock hay.

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Bolinder Munktell Bolinder-Munktell BM-21.

Estimated Continuous Field Runtime: 8.9 hrs

Approximately 8.9 hours of continuous field operation at ~75% rated power on a full tank (19.8 gal / 75 L).

Estimated 75% Load Fuel Burn~2.2 gal/hr (8.5 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours

Bolinder Munktell Bolinder-Munktell BM-21 Specification Unit Converter

Convert power, fluid capacities, and operating weights between metric and imperial standards for Bolinder Munktell Bolinder-Munktell BM-21.

Enter value:

Unit:

Converted Equivalents:

Horsepower (HP)43 hp

Kilowatts (kW)32.1 kW

Metric Horsepower (PS / CV)43.6 PS

Direct Competitor Comparison

Compare Bolinder-Munktell BM-21 against same-era industry alternatives in the same horsepower class.

Current Model

Bolinder Munktell