Bolinder-Munktell BM 400 (Buster), T 400 / BM-Volvo 400 (Buster), T 400

The BM 320’s name Buster was so well established that it was inherited by its successor the 400 Buster. This machine was a new design, with its transmission dimensioned for industrial machines and to be able to take a more powerful engine. The gearbox had four forward speeds and one reverse which, with a high and a low ratio range, gave a total of eight forward and two reverse gears. With the closer gear ratios, the overlap between the gears became significantly better than before. The lowest ratio gave a speed of 1,8 km/h at 1800 r/min. One innovation was the driving-wheel-dependent power take-off. This feature meant that, with the tractor stationary and the high/low range selector in neutral, stationary machines could be driven at different speeds by selecting a suitable gear.
It was even possible to change the direction of rotation by engaging reverse gear, a feature greatly appreciated by anyone whose threshing machine or potato harvester had jammed. Blockages could easily be cleared and the machinery allowed driving in reverse. The 400 Buster had modern, enclosed disk brakes and Terra-Trol hydraulics. The increasing number of industrial and forestry machines meant that the system for machine designations need to be revised. T signified tractor, so Buster was called T 400. Between 1964 and 1969 more than 25 000 machines in the 400 series were produced. Of these, in round figures, 800 were industrial machines, 600 loading machines (LM 422), 550 forestry machines (SM 460) and 250 backhoe loaders (GM 410).
BM 400 (Buster), T 400 specifications
Engine Perkins D 913
Cylinders 3
Cylinder capacity, l 2,5
Rated output at, r/min 2250
...DIN/SAE, hk 42,5/47
Gears, forward/reverse 8/2
Wheelbase, mm 2100
Operating weight, kg 1980
No. made
...T 400 (1964-1969) 22 589
...T 400 I (1965-1969) 823
...T 400 PKD (1965-1966) 547
Production year 1964-1969