The revamped Fiat lineup, known as the Diamond series, was introduced at the end of 1964. The tractors featured modern styling, a redesigned dashboard, and extended wheelbases. The hydraulic system was called Control-Matic. Piccola’s successor, the 215, weighed 60 kg more than its predecessor but retained the same 1.1-litre engine. In Finland it was rated at 23 hp SAE. A differential lock and a weight-transfer system were standard. There were also narrow-track and high-ground-clearance versions of the 215.

The successors to the 35 and 45 models, the 315 and 415, still used old pre-chamber diesel engines. Despite their small displacement, these engines were four-cylinder units. Their SAE power ratings were 38 and 48 hp. The 6+2 gearbox was partially synchronized and operated by a single lever. The 415 featured a PTO independent of the drive clutch. These models used a 24 V electrical system.

The successor to the Ukko-Fiat, the 615, was the smallest model fitted with an OM direct-injection diesel. Its engine had grown to 4.4 litres and produced 72 hp SAE. The gearbox was 7+2, and a reduction gear was available as an optional extra. In the shift pattern, seventh gear could be used in both the low and high ranges. In some countries, the predecessor of the 850 was also sold—a 715 with a 4.9-litre engine rated at 78 hp SAE. In Italy, the 615 and 715 were marketed under the OM brand instead of Fiat.

Alongside these models, Fiat’s range still included the larger Fiat 80R, also known simply as the 100, whose 6.9-litre four-cylinder engine produced 80 hp DIN (95 hp SAE).

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