Allis Chalmers U
| | 1929 - 1952 |
| Standard-tread tractor |
|
| Production |
| Manufacturer | Allis Chalmers
|
| Standard-tread tractor |
| Built in West Allis, Wisconsin, USA |
| Total built | 19,009
|
| 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. |
| Variants |
| U | standard
|
| UC | row-crop
|
| Allis Chalmers U Power |
| Drawbar (claimed) | 20 hp
14.9 kW
|
| Belt (claimed) | 31 hp
23.1 kW
|
| Plows | 3 (14-inch)
|
| Drawbar (tested) | 30.37 hp
22.6 kW
|
| Belt (tested) | 35.04 hp
26.1 kW
|
 Performance test details ... |
| Mechanical |
| Two-wheel drive |
| U Serial Numbers |
| Location: | Rear of differential, near PTO
|
| 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
|
FAQ: How to read a serial number table.
|
| References |
 |
| Agricultural Catalog published in 1935, by Allis Chalmers |
| Page information |
 |
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| Email me: Peter@TractorData.com |
| TractorData is a family-owned small business located in Minnesota. I have been researching tractor history and providing specifications for free since 1999. |
| Peter Easterlund - owner/author |
| This machine's data modified on December 2, 2025 |
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Consult official
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Engine details ...
Transmission details ...
Allis Chalmers U photos...
Full dimensions and tires ...