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Allis Chalmers U

Allis Chalmers U tractor
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The Allis Chalmers U is a standard-tread farm tractor produced from 1929 to 1952 by Allis Chalmers in West Allis, Wisconsin, USA. A total of 19,009 units were built. It was available in standard and row-crop variants (U and UC). The tractor was equipped with several engine options including Continental 4.6L, Waukesha 4.9L, and Allis-Chalmers 5.2L 4-cylinder gasoline engines. Transmission options included 3-speed and 4-speed gearboxes, with the 4-speed offered on rubber-tired tractors. The U featured two-wheel drive and had a claimed drawbar power of 20 hp and belt power of 31 hp, with tested drawbar power reaching over 30 hp. It could pull 3 14-inch plows. The tractor weighed 4,600 lbs and had dimensions of approximately 118.5 inches in length, 63.1 inches in width, and 53.5 inches in height. Tires varied between steel and rubber agricultural sizes.
Allis Chalmers Utractorspecificationsenginetransmissionpowerdimensionsserial numbersfarm tractor
Power34 hp[B]
Founded1929 - 1952
ModelU

Technical Specifications

Detailed specifications and technical data for Allis Chalmers U

Power

Plows:3 (14-inch)
Belt (tested):35.04 hp (26.1 kW)
Belt (claimed):31 hp (23.1 kW)
Drawbar (tested):30.37 hp (22.6 kW)
Drawbar (claimed):20 hp (14.9 kW)

Tires

Ag rear:42x11 steel, 12.75x24
Ag front:28x6 steel, 6.00x16

Engine

Fuel tank:24 gal (90.8 L)
Engine options:Continental 4.6L 4-cyl gasoline, Waukesha 4.9L 4-cyl gasoline, Allis-Chalmers 5.2L 4-cyl gasoline
Continental engine:4-cylinder, gasoline, liquid-cooled, Displacement 283.7 ci (4.6 L), Bore/Stroke 4.25x5.00 inches (108 x 127 mm), Rated RPM 1200, Coolant capacity 20 qts (18.9 L)
Waukesha UM engine:4-cylinder, gasoline, liquid-cooled, Displacement 300.7 ci (4.9 L), Bore/Stroke 4.375x5.00 inches (111 x 127 mm), Rated RPM 1200, Used beginning in 1932, tractor serial number 7405
Allis-Chalmers UM engine:4-cylinder, gasoline, liquid-cooled, Displacement 318 ci (5.2 L), Bore/Stroke 4.50x5.00 inches (114 x 127 mm), Rated RPM 1200, Final engine, available in 1936 (SN 12001)

Variants

U:standard
UC:row-crop

Dimensions

Width:63.1 inches (160 cm)
Height:53.5 inches (135 cm)
Length:118.5 inches (300 cm)
Weight:4,600 lbs (2086 kg)

Mechanical

Drive:Two-wheel drive

Production

Notes: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.
Built in:West Allis, Wisconsin, USA
Total built:19,009
Manufacturer:Allis Chalmers
Years produced:1929 - 1952

Transmission

3-speed:3 forward and 1 reverse
4-speed:4 forward and 1 reverse, The four-speed transmission was offered on tractors equipped with rubber tires.
Transmission options:3-speed, 4-speed

Serial Numbers

1929:1
1930:1975
1931:6554
1932:7262
1933:7419
1934:7685
1935:8063
1936:9471
1937:12822
1938:14855
1939:15587
1940:16078
1941:16722
1942:17137
1943:17470
1944:17802
1945:-unknown-
1946:-unknown-
1947:18309, 20174
1948:18613, 20179, 21000
1949:20301, 210036, 22018
1950:20422, 22024
Location:Rear of differential, near PTO