Allis-Chalmers Model ED40
Allis-Chalmers ED40 - 7158 NU at Darley Dale 09 - IMG 9929
A restored ED40 at the Darley Dale Festival of Transport 2009
Model history
Model introduced 1960
Model discontinued 1964
Model status Discontinued
Engine Specification
Engine make Standard Motor Co
Fuel type diesel
Power hp 41
Power kW 31
Displacement cu in /(litre) 137.89 cu in
No. of Cylinders 4
Cooling system Water
Transmission Details
Transmission type Unknown
Drive 2WD
Linkage Category Unknown
Other info
Factories Essendine, Lincolnshire, England
Plow rating Unknown
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The Allis-Chalmers ED-40 tractor was the last model made by the UK subsidiary of the American Allis-Chalmers Corporation before the plant at Essendine, Lincolnshire was closed. Introduced at the Smithfield Show, London in 1960, it retained all the features that rowcrop farmers required but in a manner that made it a universal farm tractor. Only diesel power was available from a four cylinder ohv engine of 137.89 cu.ins. with indirect injection. The engines were made by the Standard Motor Co of Coventry, England (the same engine as used in the earlier Coventry built Massey Ferguson 35 tractors) and produced 41 hp (31 kW).

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. An 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 2009. A few ED40s were exported to the USA.

For brand history, see Allis-Chalmers.


A Number of these tractors can be seen at UK steam rallies and tractor shows. These are a relatively light weight tractor facilitating transport behind a 4-wd or a van (light commercial).

known tractors in preservation

(please list details below)

List of Preserved Allis-Chalmers ED40 tractors
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Make + Model No.
Reg No.
(if known)
Serial No. Build-Date Engine-Type/Make Owner
(if known)
Photo Were seen/Featured in Other info
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See alsoEdit

References / sources Edit

  • Farmer and Stockbreeder, 6 December 1960, page 127
  • Farm Mechanisation, July 1963
  • Operators handbook - Allis Chalmers Great Britain Ltd, 1960-68

External linksEdit

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