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Tractor · 1929Unverified

Allis Chalmers U

Name: Allis Chalmers U
Brand: Allis Chalmers

Allis Chalmers U — Standard-tread tractor · 20 hp. Reference specifications; pending source verification.

The Allis Chalmers U is a tractor with a rated output of 20 hp, representing a compact option within its class. Production of the U model took place from 1929 to 1952. It features a 4-cylinder petrol liquid-cooled engine, coupled with a 3-speed gearbox and two-wheel drive. The tractor's listed weight is 2086 kg, with a capacity to handle tasks of approximately 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

20 hp

Max power

19.1 kW

Weight

2086 kg

Catalogue coverage

Variants represented

Richest spec table

94 rows

Recorded power

20 hp

Recorded weight

2086 kg

Transmissions

3-speed

Production years

1929-1952

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerAllis ChalmersReference

Standard-tread tractorReference

Built in West Allis, Wisconsin, USAReference

Total built19,009Reference

Tractors fitted with factory steel wheels had a 3-speed gearbox, done by removing a shifter fork from the regular transmission. The U was also sold as the United Model U (1929-1931), and was distributed by the United Tractor and Equipment Corporation. United was a group of Fordson dealers who contracted Allis for a new tractor, once Ford stopped North American production of the Fordson.Reference

Two-wheel driveReference

Variants

UstandardReference

UCrow-cropReference

Engine

Continental 4.6L 4-cyl gasolineReference

Waukesha 4.9L 4-cyl gasolineReference

Allis-Chalmers 5.2L 4-cyl gasolineReference

Fuel tank90.8 LReference

Drawbar (claimed)14.9 kWReference

Belt (claimed)23.1 kWReference

Plows3 (14-inch)Reference

Drawbar (tested)22.6 kWReference

Belt (tested)26.1 kWReference

ContinentalReference

gasolineReference

4-cylinderReference

liquid-cooledReference

Displacement4.6 LReference

Bore/Stroke108 x 127 mmReference

Rated RPM1200Reference

Coolant capacity18.9 LReference

Waukesha UMReference

The UM engine was used beginning in 1932, tractor serial number 7405.Reference

Displacement4.9 LReference

Bore/Stroke111 x 127 mmReference

Allis-Chalmers UMReference

Final engine, available in 1936 (SN 12001)Reference

Displacement5.2 LReference

Bore/Stroke114 x 127 mmReference

Belt power (max)26.1 kWReference

Max power19.1 kWReference

Belt power (max)25.4 kWReference

Max power17.8 kWReference

Max power22.6 kWReference

Transmission

3-speedReference

4-speedReference

Gears3 forward and 1 reverseReference

Gears4 forward and 1 reverseReference

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

Dimensions

Weight2086 kgReference

Front tire28x6Reference

Rear tire42x11Reference

Ag front28x6 steelReference

Ag rear42x11 steelReference

Ag front6.00x16Reference

Ag rear12.75x24Reference

Length300 cmReference

Width160 cmReference

Height135 cmReference

U Serial Numbers

Location:Rear of differential, near PTOReference

19291Reference

19301975Reference

19316554Reference

19327262Reference

19337419Reference

19347685Reference

19358063Reference

19369471Reference

193712822Reference

193814855Reference

193915587Reference

194016078Reference

194116722Reference

194217137Reference

194317470Reference

194417802Reference

1945-unknown-Reference

1946-unknown-Reference

194718309, 20174Reference

194818613, 20179, 21000Reference

194920301, 210036, 22018Reference

195020422, 22024Reference

FAQ: How to read a serial number table.Reference

Test results

NTTL 170: Contintental 3-speed 2WDReference

NTTL 237: Waukesha 300 3-speed 2WD steel wheelsReference

NTTL 237: Waukesha 300 3-speed 2WD rubber wheelsReference

Contintental 3-speed 2WDOctober 21 - November 7, 1929Link: Nebraska Tractor Test 170 fileReference

Belt fuel use (max)15.9 l/hourReference

Drawbar performanceReference

Gear 1 used for power test.Reference

Max pull1668 kgReference

Gear 1 used for pull test.Reference

Waukesha 300 3-speed 2WD steel wheelsJuly 15 - August 5, 1935Link: Nebraska Tractor Test 237 fileReference

Belt fuel use (max)15.5 l/hourReference

Gear 2 used for power test.Reference

Max pull1554 kgReference

Waukesha 300 3-speed 2WD rubber wheelsJuly 15 - August 5, 1935Link: Nebraska Tractor Test 237 fileReference

Gear 4 used for power test.Reference

Max pull1112 kgReference

Gear 2 used for pull test.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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