Compare/Allis Chalmers C vs Allis Chalmers U

Allis Chalmers C vs Allis Chalmers U

Verdict: Allis Chalmers C vs Allis Chalmers U

The Allis Chalmers C and the Allis Chalmers U are both tractors — here is how they stack up on the figures that matter. Allis Chalmers U leads on rated power with 20 hp against 19 hp. Allis Chalmers C is the lighter machine (1,134 kg vs 2,086 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers U holds more fuel (90.8 L vs 49.2 L) for longer stints between fills. Allis Chalmers C is the newer design (1940 vs 1929). In short: choose the Allis Chalmers U for outright pulling power, or the Allis Chalmers C 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

19 hp

20 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Allis ChalmersReference

Gasoline 3-speed 2WDOctober 28 - November 7, 1940Link: Nebraska Tractor Test 364 fileReference

The four-speed transmission was offered on tractors equipped with rubber tires.Reference

Total built

84,020Reference

19,009Reference

Engine

Fuel tank

49.2 LReference

90.8 LReference

Aux. fuel

3.8 LReference

—

Plows

2Reference

3 (14-inch)Reference

Drawbar (tested)

13.7 kWReference

22.6 kWReference

Displacement

2.1 LReference

5.2 LReference

Bore/Stroke

86 x 89 mmReference

114 x 127 mmReference

Air cleaner

oil bathReference

—

Compression

5.75:1Reference

—

Rated RPM

1500Reference

1200Reference

Firing order

1-2-4-3Reference

—

Starter volts

6Reference

—

Coolant capacity

7.6 LReference

18.9 LReference

Sparkplug

AC 45Reference

—

Sparkplug gap

0.889 mmReference

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Point gap

0.508 mmReference

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Intake valve clearance

0.254 mmReference

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Exhaust valve clearance

0.254 mmReference

—

Oil capacity

6.6 LReference

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Power at rated engine speed

17.4 kWReference

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Max power

13.7 kWReference

22.6 kWReference

Drawbar (claimed)

—

14.9 kWReference

Belt (claimed)

—

23.1 kWReference

Belt (tested)

—

26.1 kWReference

Belt power (max)

—

25.4 kWReference

Transmission

Type

non-synchronized gearReference

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Gears

3 forward and 1 reverseReference

4 forward and 1 reverseReference

Oil type

SAE20WReference

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PTO & Hydraulics

PTO (tested)

17.4 kWReference

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Rear PTO

transmissionReference

—

Rear PTO Type

560Reference

—

Dimensions

Wheelbase

195 cmReference

—

Weight

1134 kgReference

2086 kgReference

Front tire

4.00-15Reference

28x6Reference

Rear tire

9-24Reference

42x11Reference

Ag front

6-12Reference

6.00x16Reference

Ag rear

10-24Reference

12.75x24Reference

Length

289 cmReference

300 cmReference

Height

159 cmReference

135 cmReference

Front tread

208 cmReference

—

Rear tread

132 to 203 cmReference

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C Serial Number Location

C Serial Numbers

1940

1Reference

16078Reference

1941

112Reference

16722Reference

1942

12389Reference

17137Reference

1943

18782Reference

17470Reference

1944

23908Reference

17802Reference

1945

30695Reference

-unknown-Reference

1946

36378Reference

-unknown-Reference

1947

39168Reference

18309, 20174Reference

1948

51515Reference

18613, 20179, 21000Reference

1949

68281Reference

20301, 210036, 22018Reference

1950

80518Reference

20422, 22024Reference

Capacities

Diameter

20 cmReference

—

Width

173 cmReference

160 cmReference

RPM

1129Reference

—

Electrical

Ground

positiveReference

—

Charging system

generatorReference

—

Charging amps

12Reference

—

Battery volts

6Reference

—

Battery AH

95Reference

—

Test results

Fuel use

7.6 l/hourReference

—

Max pull

1066 kgReference

1112 kgReference

Belt fuel use (max)

—

15.5 l/hourReference

Variants

—

standardReference

—

row-cropReference

U Serial Numbers

1929

—

1Reference

1930

—

1975Reference

1931

—

6554Reference

1932

—

7262Reference

1933

—

7419Reference

1934

—

7685Reference

1935

—

8063Reference

1936

—

9471Reference

1937

—

12822Reference

1938

—

14855Reference

1939

—

15587Reference

Location:

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Rear of differential, near PTOReference

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.