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About the Allis-Chalmers HD21

Allis-Chalmers started producing the HD21 Industrial/Construction in 1954 and continued until 1965. Sometimes, the parts compatibility is determined by the serial number of your Allis-Chalmers HD21 Industrial/Construction, and that info should be listed on the part fit notes. If you don't have the serial number of your tractor, you can find it on the steering clutch housing or instrument panel. The 3-point hitch is very reliable. It is also worth noting that the PTO.

Parts for Allis-Chalmers HD21 Industrial/Construction