In 1948, the Massey-Harris 22 and 26 SP were introduced in America, equipped with a 3.6-meter cutting platform. Based on these, the English 722 and 726 models were developed, as well as the corresponding French 826. In 1950, Hankkija brought two Massey-Harris machines to Finland, which were the first self-propelled combines in the country.

The 722 was equipped with a Continental gasoline engine. The 726 used Austin and Morris gasoline engines. The engine was located, somewhat questionably from a fire safety perspective, under the machinery between the front wheels. The travel speed was adjusted with a 2×12-step variator controller, and the combine was stopped by loosening the variator; there was no clutch. The straw walker was an optional accessory. The raising of the cutting platform was electric. The threshing mechanism width was only 62 cm, so the 726’s 260-centimeter cutting platform was quite boldly sized in comparison. The top sieve was adjustable.

In 1952, the 726 was replaced by the new Massey Harris 780, which featured a wider threshing mechanism. The 780 was based on the American Super 60 and 80 models. The 780’s engines included 6-cylinder Austin and Chrysler gasoline engines, a 4-cylinder Morris gasoline or petrol engine, and later also a 4.5-liter Perkins diesel. The top speed remained 12 km/h. The speed of the threshing drum was adjusted by changing sprockets, "because hydraulic adjustment systems rarely maintain the desired speed without constant tuning." A novelty was a patented straw-lift drum length adjustment crank operated from the cab. A stone trap was added in front of the threshing drum.

The 780 S (Special), introduced in 1958, featured improved controls. The raising of the cutting platform was changed to hydraulic operation. The speed of the straw walker could be adjusted separately. A new foot pedal was added to release the hydraulically operated travel speed variator. The bottoms of the grain tanks could be detached from the rear. The number of lubrication points was significantly reduced, and there were only 10 daily greasing points.

Approximately 28,000 units of the 780 were produced in total. Its successor was the 788, which remained in production until the late 1960s. The most significant changes were a new grain elevator and an increased cutter bar speed. The 788 was mostly confined to the British market, while elsewhere focus was on the German 685 and the French 892.

The much less produced little brother of the 780, the 735, was manufactured from 1956 to 1962. It was equipped with a 6-foot cutting platform, a 61 cm threshing drum, and a 4-cylinder BMC Newage gasoline engine. The cutting platform height adjustment was manual.

This is an automated translation. Please report any issues in the translation.