The A and B series 850 Implematic tractors had a 4-cylinder diesel engine giving 35 bhp at 2000 rev/min. Petrol (gasoline) versions were also offered. The Implematic hydraulic system enabled this small tractor to give an outstanding performance with mounted implements. The later C and D series had diesel engines only and featured the multi-speed PTO and improved front axle clearance. From April 1963 height control was included in the hydraulic system.