This meant that the cab could be ventilated with fresh air which had passed through large paper filters. In time, air conditioning was offered as an option.
The 650 was supplied with independent and driving-wheel-dependent power take-offs, each operated with a separate plate-type clutch. Much improved Terra Trol Mark II hydraulics were introduced into production in February 1975.
Production continued for 12 years. During that time, many minor and major improvements were introduced. 26 120 agricultural and military tractors were made. Of these, 1 502 were yellow industrial tractors and 2 080 were in the form of PKD (partially-assembled) kits for the assembly factory in Iran and other chassis for external superstructure builders.