Compare/Allis Chalmers B vs Allis Chalmers M

Allis Chalmers B vs Allis Chalmers M

Verdict: Allis Chalmers B vs Allis Chalmers M

The Allis Chalmers B and the Allis Chalmers M are both tractors — here is how they stack up on the figures that matter. Allis Chalmers M leads on rated power with 22 hp against 20 hp. Allis Chalmers B is the lighter machine (934 kg vs 2,812 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Allis Chalmers M holds more fuel (90.8 L vs 45.4 L) for longer stints between fills. Allis Chalmers B is the newer design (1938 vs 1932). In short: choose the Allis Chalmers M for outright pulling power, or the Allis Chalmers B 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

20 hp

22 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Allis ChalmersReference

Gear 1 used for pull test.Reference

Gear 2 used for power test.Reference

Factories

Southampton, EnglandReference

—

Total built

120,783Reference

14,524Reference

Steering

manualReference

—

Drive

—

crawlerReference

Variants

industrial tractorReference

—

standard widthReference

—

wideReference

Engine

Fuel tank

45.4 LReference

90.8 LReference

Plows

1 (16-inch)Reference

—

Drawbar (tested)

14.5 kWReference

22.1 kWReference

Belt (tested)

16.6 kWReference

26.4 kWReference

Displacement

1.9 LReference

5.2 LReference

Bore/Stroke

76 x 102 mmReference

114 x 127 mmReference

Air cleaner

oil bathReference

Compression

4.92:1Reference

4.7:1 (late)Reference

Rated RPM

1400Reference

1200Reference

Firing order

1-2-4-3Reference

—

Starter volts

6Reference

Oil capacity

5.7 LReference

11.4 LReference

Sparkplug

AC 45Reference

—

Sparkplug gap

1.016 mmReference

—

Point gap

0.508 mmReference

—

Intake valve clearance

0.254 mmReference

—

Exhaust valve clearance

0.254 mmReference

—

Coolant capacity

7.6 LReference

22.7 LReference

Belt power (max)

16.6 kWReference

26.1 kWReference

Max power

14.5 kWReference

21.4 kWReference

Drawbar (claimed)

—

16.4 kWReference

Belt (claimed)

—

23.9 kWReference

Transmission

Gears

3 forward and 1 reverseReference

4 forward and 1 reverseReference

Clutch

dry discReference

Rockford dry plateReference

Oil type

[0oC]Reference

—

32oF [0oC]↑

: SAE140Reference

—

32oF [0oC]↓

: SAE90Reference

—

PTO & Hydraulics

Type

unsynchronized gearReference

gearReference

Rear PTO

transmissionReference

—

Rear PTO Type

560Reference

—

Dimensions

Wheelbase

186 cmReference

—

Weight

934 kgReference

2812 kgReference

Front tire

4.00-15Reference

—

Rear tire

9-24Reference

—

Ag front

4.00-15Reference

—

Ag rear

8-38 (Asparagus Special)Reference

—

Length

280 cmReference

257 cmReference

Height (exhaust)

194 cmReference

—

Shipping weight

934 kgReference

—

Ballasted weight

1901 kgReference

—

Ground clearance

71 cmReference

—

Front tread

96 to 152 cmReference

—

Rear tread

101 to 152 cmReference

—

Height

—

142 cmReference

Gauge

—

101 cmReference

B Serial Number Location

B Serial Numbers

1938

97Reference

7067Reference

1939

11800Reference

8127Reference

1940

33502Reference

9540Reference

1941

49721Reference

11380Reference

1942

56782Reference

12947Reference

1943

64501Reference

—

1944

65502Reference

—

1945

70210Reference

—

1946

1001 (IB)Reference

—

1947

1003 (IB)Reference

—

1948

1010 (IB)Reference

—

1949

1282 (IB)Reference

—

1950

1556 (IB)Reference

—

1951

4001 (EB)Reference

—

1952

6861 (EB)Reference

—

1953

9200 (EB)Reference

—

1954

11120 (EB)Reference

—

1955

124711Reference

—

1956

126497Reference

—

1957

127186Reference

—

Final

127461Reference

—

Capacities

Diameter

20 cmReference

—

Width

157 cmReference

145 cmReference

RPM

1053Reference

—

Electrical

Ground

positiveReference

—

Charging system

generatorReference

—

Charging amps

12Reference

—

Battery volts

6Reference

—

Test results

Belt fuel use (max)

7.9 l/hourReference

15.9 l/hourReference

Max pull

1209 kgReference

2272 kgReference

M Serial Numbers

1932

—

1Reference

1933

—

42Reference

1934

—

402Reference

1935

—

842Reference

1936

—

1942Reference

1937

—

3842Reference

Location:

—

Right side of transmission caseReference

Allis Chalmers M Tracks

Length on ground

—

143 cmReference

Area on ground

—

0.9 m²Reference

Ground pressure

—

0.3 barReference

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.