Allis-Chalmers ED40

Transmission was 8 speed through a single clutch with the option of the Allis-Chalmers half shaft clutch to achieve 'live' power take-off. Converging three point linkage was powered by an engine mounted hydraulic pump giving hydraulic power whenever the engine was running regardless of transmission status. A hydraulic weight transfer system was built in to increase traction and a simple mechanical depth stop was provided on the earlier machines. Later machines, introduced mid-1963 and called 'Depthomatic' had a draught and position control system. Other modifications and options included improved gear ratios; a pick-up hitch; an increase in power through higher maximum revs and revised battery arrangement. An option on both models was the patent Allis-Chalmers PAVT rear wheels (Power Adjusted Variable Track), a system adopted by other manufacturers after patents expired. Production ended in 1968 and quite a few are still in use on farms in 2011. A few ED40s were exported to the USA. It's hard to say exactly how many made it to the US, but it seems most of them ended up in the Mid-Atlantic and South Eastern regions.