Compare/Allis Chalmers HD6 vs Allis Chalmers K-O

Allis Chalmers HD6 vs Allis Chalmers K-O

Verdict: Allis Chalmers HD6 vs Allis Chalmers K-O

The Allis Chalmers HD6 and the Allis Chalmers K-O are both tractors — here is how they stack up on the figures that matter. Allis Chalmers HD6 leads on rated power with 57 hp against 50 hp. Allis Chalmers K-O is the lighter machine (5,216 kg vs 12,400 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers HD6 is the newer design (1955 vs 1934). In short: choose the Allis Chalmers HD6 for outright pulling power, or the Allis Chalmers K-O if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

Tune the fit score

Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Allis Chalmers

Fit score

Best match

Clear

Allis Chalmers

Fit score

Best match

Clear

Rated power

57 hp

50 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Allis ChalmersReference

Gear 1 used for pull test.Reference

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

Drive

crawlerReference

Variants

HD6A

44-inch gaugeReference

—

HD6B

60-inch gaugeReference

—

HD6E

5-rollerReference

—

HD6G

loaderReference

—

HD6EP

power shiftReference

—

HD6AG

turbochargedReference

—

gasolineReference

—

wide gasReference

K-O

—

dieselReference

WK-O

—

wide dieselReference

Engine

Fuel tank

151.4 LReference

—

Engine (net)

42.5 kWReference

—

Drawbar (claimed)

33.6 kWReference

—

Belt (claimed)

41.0 kWReference

—

Drawbar (tested)

37.2 kWReference

37.6 kWReference

Belt (tested)

45.1 kWReference

44.0 kWReference

Displacement

5.6 LReference

9.2 LReference

Bore/Stroke

113 x 141 mmReference

133 x 165 mmReference

Power (net)

42.5 kWReference

—

Compression

15.0:1Reference

6.5:1Reference

Rated RPM

1800Reference

1050Reference

Starter volts

24Reference

—

Oil capacity

18.9 LReference

—

Coolant capacity

14.2 LReference

—

Belt power (max)

45.1 kWReference

44.0 kWReference

Max power

37.2 kWReference

37.6 kWReference

Fuel system

—

mechanical injectionReference

Air cleaner

—

oil bathReference

Transmission

Type

power shiftReference

gearReference

Gears

2 forward and reverseReference

4 forward and 1 reverseReference

Dimensions

Weight

12400 to 13400 poundsReference

5216 kgReference

Length

322 cmReference

303 cmReference

Height

167 cmReference

—

Shipping weight

5624 kgReference

—

Operating weight

6078 kgReference

—

Gauge

152 cmReference

—

KO Width

—

167 cmReference

Height (hood)

—

162 cmReference

KO Gauge

—

121 cmReference

WKO Gauge

—

160 cmReference

HD6 Serial Numbers

1955

101Reference

—

1956

1147Reference

—

1957

6466Reference

—

1958

7948Reference

—

1959

10054Reference

—

1960

12506Reference

—

1961

13777Reference

—

1962

14898Reference

—

1963

16042Reference

—

1964

17105Reference

—

1965

18189Reference

—

Location:

Serial number stamped on the rear of steering clutch housing or on the instrument panel. (upper-right)Reference

—

Allis Chalmers HD6 Tracks

Width

199 cmReference

38 cmReference

Test results

Belt fuel use (max)

20.1 l/hourReference

17.4 l/hourReference

Max pull

5731 kgReference

5300 kgReference

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.