Thermaenius was acquired by BM Volvo in 1960, and soon after, the ST 256 was replaced by the updated ST 257, which was Sweden’s most popular combine harvester in the 1960s. The combine harvester had a cutting width of 7 1/4 feet and was equipped with either a Volvo 35-horsepower gasoline engine or a Perkins diesel engine of the same power. The cutting table could be engaged separately. Instead of a shaker conveyor, a belt conveyor was initially used, and there was no feed drum. The grain sieve was adjustable from the operator’s position. The number of greasing points was greatly reduced compared to the previous model and, compared to other combine harvesters of the same era, there were relatively few. The grain sieve was adjustable, and weed seeds were removed with a cylindrical separator.

In 1967, an 8 1/4-foot cutting table was introduced alongside the original one, and the structure was reinforced, among other things, in the reel chamber, power transmission, rear axle, and brakes. The middle picture shows the updated model, which was somewhat more angular than the earlier version.

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