Compare/Allis Chalmers HD7 vs Allis Chalmers K-O

Allis Chalmers HD7 vs Allis Chalmers K-O

Verdict: Allis Chalmers HD7 vs Allis Chalmers K-O

The Allis Chalmers HD7 and the Allis Chalmers K-O are both tractors — here is how they stack up on the figures that matter. Allis Chalmers K-O leads on rated power with 50 hp against 45 hp. Allis Chalmers K-O is the lighter machine (5,216 kg vs 6,350 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers HD7 is the newer design (1940 vs 1934). In short: choose the Allis Chalmers K-O for outright pulling power, or the Allis Chalmers HD7 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Acreage600 acBudgetMain crop / use

Fit & specs

Allis Chalmers

Fit score

Best match

Clear

Allis Chalmers

Fit score

Best match

Clear

Rated power

45 hp

50 hp

Confidence

40%

Guide price

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Overview

Manufacturer

Allis ChalmersReference

Gear 1 used for pull test.Reference

The three-speed transmission was used on early models, built during 1934.Reference

Total built

1,803Reference

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Drive

crawlerReference

Engine

Fuel tank

117.3 LReference

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Drawbar (claimed)

33.6 kWReference

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Belt (claimed)

44.7 kWReference

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Drawbar (tested)

42.7 kWReference

37.6 kWReference

Belt (tested)

51.2 kWReference

44.0 kWReference

Displacement

3.5 LReference

9.2 LReference

Bore/Stroke

108 x 127 mmReference

133 x 165 mmReference

Air cleaner

oil bathReference

Compression

16.0:1Reference

6.5:1Reference

Rated RPM

1500Reference

1050Reference

Starter volts

12Reference

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Coolant capacity

21.8 LReference

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Oil capacity

19.9 LReference

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Belt power (max)

51.2 kWReference

44.0 kWReference

Max power

42.7 kWReference

37.6 kWReference

Fuel system

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mechanical injectionReference

Transmission

Type

sliding gearReference

gearReference

Gears

4 forward and 1 reverseReference

Dimensions

Weight

6350 kgReference

5216 kgReference

Length

325 cmReference

303 cmReference

Height

175 cmReference

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Operating weight

6350 kgReference

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Gauge

132 cmReference

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KO Width

—

167 cmReference

Height (hood)

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162 cmReference

KO Gauge

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121 cmReference

WKO Gauge

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160 cmReference

HD7 Serial Numbers

1940

3Reference

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1941

503Reference

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1942

1137Reference

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1943

5403Reference

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1944

5753Reference

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1945

8949Reference

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1946

12091Reference

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1947

13078Reference

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1948

15122Reference

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1949

16752Reference

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1950

18086Reference

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Location:

Serial number stamped on the right-rear of the transmission case or on a plate near the instrument panel.Reference

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Allis Chalmers HD7 Tracks

Width

205 cmReference

38 cmReference

Length on ground

170 cmReference

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Area on ground

1.4 m²Reference

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Ground pressure

0.4 barReference

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Test results

Belt fuel use (max)

18.2 l/hourReference

17.4 l/hourReference

Max pull

5520 kgReference

5300 kgReference

Variants

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gasolineReference

—

wide gasReference

K-O

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dieselReference

WK-O

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wide dieselReference

Allis Chalmers K-O Tracks

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.