Allis Chalmers D 40 vs Allis Chalmers HD-21
Verdict: Allis Chalmers D 40 vs Allis Chalmers HD-21
The Allis Chalmers D 40 and the Allis Chalmers HD-21 are both industrial tractors — here is how they stack up on the figures that matter. Allis Chalmers D 40 leads on rated power with 385 hp against 268 hp. Allis Chalmers HD-21 is the lighter machine (22,680 kg vs 52,000 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers HD-21 is the newer design (1967 vs 1963). In short: choose the Allis Chalmers D 40 for outright pulling power, or the Allis Chalmers HD-21 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.