Technical register for agricultural, construction and commercial machinery · sourced data
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Allis Chalmers Other models

5 models in this series

Allis-Chalmers – other models: construction machines from the construction division outside the named ranges, from the D17 backhoe to the HD-21 crawler, 40 to 152 kW, diesel and petrol engines from Allis-Chalmers and GM

Allis Chalmers HD-21 crawler
Pictured: Allis Chalmers HD-21 crawler

This page gathers the Allis-Chalmers construction machines D17 backhoe, HD-11 crawler, HD-14 crawler, HD-16 Series B crawler and HD-21 crawler, which the register could not assign to a named range. The HD range denoted Allis-Chalmers's crawler dozers from the construction division, with the number as an ascending size and power class; the D17 backhoe is a version of the D17 field tractor fitted with a backhoe. In 1974 the construction division passed into the Fiat-Allis joint venture.

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The register lists here 5 versions with 40 to 152 kW, or 53 to 204 hp, with Allis-Chalmers engines and a GM Detroit Diesel 6-71 in the HD-21.

Such crawler dozers and backhoe loaders were used in earthmoving, road building and civil engineering, where the HD range, alongside makers such as Caterpillar and International Harvester, was a fixture of the post-war and 1960s US market.

Track undercarriages such as the HD range's spread the machine's weight over a large footprint, giving low ground pressure and good stability on loose or uneven ground, but they must be moved by low-bed trailer on the road. The wheeled D17 backhoe, by contrast, can drive itself on the road but loses traction and stability on soft ground.

Buying used, on these vintage construction machines the condition of tracks and rollers, clutch and final drive matter most, and on the HD-21 also the Detroit Diesel engine with its characteristic two-stroke technology; parts run through dealers specialising in classic construction machinery.

Sources: SpecCodex register, model data: Allis-Chalmers Pozostale modele (Bagger & Verdichtung)

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