The BM Volvo Buster 320 equipped with a 3-cylinder Perkins swirl chamber diesel was introduced in 1960 as the smallest model in the lineup, positioned below the Boxer 350 and Bison 470. It replaced the 425 Terrier, which had a gasoline engine. The Buster’s diesel engine was a 2.5-liter with an output of 37 hp. The production program still included a 1.8-liter, 37-horsepower gasoline version. There were 5+1 gears. A dual clutch was available as an optional extra. A limited-slip differential was standard equipment.

In 1964, the updated Buster 400 was introduced, with a power output of 47 hp SAE. The number of gears increased to 8+2, and the transmission was called the Volvo Viking K 13. The brakes were changed to disc brakes. The wheelbase was noticeably longer than before, and the tires grew larger. The Terra-Trol hydraulics remained mostly unchanged. The lifting capacity was initially stated as 1050 kg and later 1250 kg. A few hundred Busters were assembled in Porvoo at the Fiskars factory for the Finnish market.

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