In 1968, Fiat introduced a completely new tractor lineup equipped with direct injection diesel engines. The popular category of just under 60 hp was initially represented by the model 550. It had a 4-cylinder 3.1-liter engine fitted with a balance shaft. The transmission in this class was an 8+2 gearbox, with gears 3, 4, 7, and 8 synchronized. Additionally, a crawler gearbox was naturally available. The clutch diameter was 11 inches and was operated by a hand lever. The brakes were rim brakes, the power take-off (PTO) was standard equipment, and the draft sensing was done via a push rod. The Controlmatic hydraulics offered position control, a draft force equalizer, and adjustable sensitivity.

In spring 1971, the 550 in the Finnish import lineup was replaced by new 500 and 600 models. The 500 had a 2.6-liter 3-cylinder engine and the 600 a 3.5-liter 4-cylinder. Power was achieved at high RPMs, typical for Fiat (2600/2400). At the same time, four-wheel-drive models received a new front axle, where the drive wheels and planetary gearboxes were located in the wheel hubs. This increased ground clearance and improved maneuverability. Power steering became standard equipment on the four-wheel-drive models. The 600 featured a dual clutch and a separate hand clutch for the PTO.

In spring 1972, the 600 DT3 was introduced, featuring a sturdier front axle and a longer wheelbase. At the same time, the Steel cabs received a removable partial rear wall and improved sound insulation. The lower windows at the front remained very small, providing hardly any view of the front wheels.

At the beginning of 1973, the 500 was replaced by the 540, which was not imported into Finland, and the 600 was replaced by the 640. The engines were the same as before but had 4 more horsepower. The drivetrain had stronger gears than before and a more efficient radiator. At the same time, the Steel cab with larger windows was introduced. At the beginning of 1974, the cab was completely redesigned. It was more spacious than before and fully enclosed thanks to a fiberglass rear wall, but the heater was still optional. At the beginning of 1977, the cab no longer met safety regulations and was replaced by the Swedish Fernmo cab.

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