| Manufacturer | Allis Chalmers |
| Price | 19,009(USD) |
| Model | U |
| Equipment Type | Standard-Tread Tractors |
| Factory | West Allis, Wisconsin, USA |
NEBRASKA TRACTOR TEST 170 2
| Description | Contintental 3-speed 2WD October 21 - November 7, 1929 Link: Nebraska Tractor Test 170 file Drawbar performance Gear 1 used for power test. Gear 1 used for pull test |
| Belt power (max) | 35.04hp / 26.1kW |
| Belt fuel use (max) | 4.2gal/hour / 15.9l/hour |
| Max power | 25.63hp / 19.1kW |
| Max pull | 3,679lbs / 1668kg |
NEBRASKA TRACTOR TEST 237 2
| Description | Waukesha 300 3-speed 2WD steel wheels July 15 - August 5, 1935 Link: Nebraska Tractor Test 237 file Drawbar performance Gear 2 used for power test. Gear 1 used for pull test |
| Belt power (max) | 34.12hp / 25.4kW |
| Belt fuel use (max) | 4.1gal/hour / 15.5l/hour |
| Max power | 23.83hp / 17.8kW |
| Max pull | 3,428lbs / 1554kg |
NEBRASKA TRACTOR TEST 237 4
| Description | Waukesha 300 3-speed 2WD rubber wheels/July 15 - August 5, 1935/Link: Nebraska Tractor Test 237 file/Drawbar performance/Gear 4 used for power test./Gear 2 used for pull test. |
| Belt power (max) | 34.12hp / 25.4kW |
| Belt fuel use (max) | 4.1gal/hour / 15.5l/hour |
| Max power | 30.37hp / 22.6kW |
| Max pull | 2,452lbs / 1112kg |
ALLIS CHALMERS U POWER
| Drawbar (claimed) | 20hp / 14.9kW |
| Belt (claimed) | 31hp / 23.1kW |
| Plows | 3 (14-inch) |
| Drawbar (tested) | 30.37hp / 22.6kW |
| Belt (tested) | 35.04hp / 26.1kW |
ENGINES OVERVIEW
The Allis Chalmers U tractor features a choice between Continental 4.6L, Waukesha 4.9L, and Allis-Chalmers 5.2L 4-cylinder gasoline engines, offering flexibility in power output and fuel efficiency. The 5.2L variant provides superior torque for heavy-duty applications, while the smaller engines may offer improved fuel economy for lighter tasks. However, potential challenges include parts availability and performance degradation in high-load scenarios, making it essential to match the engine selection with intended use cases.
| Description | Continental 4.6L 4-cyl gasoline Waukesha 4.9L 4-cyl gasoline Allis-Chalmers 5.2L 4-cyl gasoline |
ENGINE DETAIL 1
The Allis Chalmers U tractor, powered by a Continental gasoline 4-cylinder engine, features a substantial displacement of 283.7 ci (4.6 L) and a bore/stroke ratio of 4.25x5.00 inches, which provides robust torque at a rated RPM of 1200. The engine's liquid cooling system, with a coolant capacity of 20 quarts, ensures efficient thermal management, essential for prolonged operation in demanding agricultural applications. While its relatively low RPM enhances durability, it may limit speed in some high-demand scenarios, making it more suited for tasks requiring sustained power over speed.
| Description | Continental gasoline 4-cylinder liquid-cooled |
| Displacement | 283.7ci / 4.6L |
| Bore/Stroke | 4.25x5.00inches / 108x 127 mm |
| Rated RPM | 1200 |
| Coolant capacity | 20qts / 18.9L |
ENGINE DETAIL 2
The Allis Chalmers U tractor features a Waukesha UM 4-cylinder gasoline engine with a displacement of 300.7 ci (4.9 L), delivering robust low-end torque ideal for plowing and fieldwork at its rated RPM of 1200. Its bore and stroke of 4.375 x 5.00 inches provide a balanced approach to power and efficiency; however, the relatively low RPM might limit its top speed compared to modern tractors. Operators should be aware of the need for liquid cooling maintenance to prevent overheating during extended use.
| Description | Waukesha UM gasoline 4-cylinder liquid-cooled The UM engine was used beginning in 1932, tractor serial number 7405 |
| Displacement | 300.7ci / 4.9L |
| Bore/Stroke | 4.375x5.00inches / 111x 127 mm |
| Rated RPM | 1200 |
ENGINE DETAIL 3
The Allis-Chalmers U tractor features a robust 5.2L, 4-cylinder, liquid-cooled engine with a substantial displacement of 318ci, providing reliable power delivery for various agricultural tasks. Its bore and stroke of 4.50x5.00 inches promote torque at low RPMs (rated at 1200), ideal for heavy pulling applications. However, the limited RPM range may restrict its versatility for speed-demanding operations, making it best suited for farming scenarios needing consistent power rather than high-speed performance.
| Description | Allis-Chalmers UM gasoline 4-cylinder liquid-cooled Final engine, available in 1936 (SN 12001) |
| Displacement | 318ci / 5.2L |
| Bore/Stroke | 4.50x5.00inches / 114x 127 mm |
| Rated RPM | 1200 |
ALLIS CHALMERS U ENGINES
The Allis Chalmers U features a range of powerful engines, including the Continental 4.6L, Waukesha 4.9L, and Allis-Chalmers 5.2L, providing varied horsepower options for different agricultural tasks. With a fuel tank capacity of 24 gallons (90.8L), it offers decent range for extensive fieldwork, though its fuel efficiency may vary based on load and engine configuration. The primary challenge may include sourcing parts for older models, which can affect maintenance and operational downtime.
| Description | Continental 4.6L 4-cyl gasoline Waukesha 4.9L 4-cyl gasoline Allis-Chalmers 5.2L 4-cyl gasoline |
| Fuel tank | 24gal / 90.8L |
TRANSMISSIONS OVERVIEW
The Allis Chalmers U tractor features a choice between a 3-speed and a 4-speed transmission, offering flexibility in power management and operational efficiency. The 4-speed option is advantageous for enhanced torque control in varied field conditions, while the 3-speed may be preferred for simpler operation and lower maintenance. However, operators should consider the trade-off of increased complexity and potential repair costs with the 4-speed system.
| Description | 3-speed/4-speed |
TRANSMISSION 1
The Allis Chalmers U tractor features a simple 3 forward and 1 reverse gearbox, making it easy to operate for basic agricultural tasks. The limited gearing may restrict its versatility compared to newer models with more gear options, which can be a disadvantage in varied terrains. However, for straightforward applications like small field work or yard maintenance, this setup can provide adequate performance and reliability.
| Gears | 3 forward and 1 reverse |
TRANSMISSION 2
The Allis Chalmers U tractor features a four-speed transmission with one reverse gear, ideal for versatile field operations and maneuverability. Its gear ratio allows for optimized performance on both flat and uneven terrain, making it suitable for various agricultural tasks. However, limited forward speeds may challenge operators needing rapid transit over larger distances.
| Gears | 4 forward and 1 reverse |
| Description | The four-speed transmission was offered on tractors equipped with rubber tires. |
MECHANICAL
The Allis Chalmers U features a 4x2 two-wheel drive chassis, suitable for light to moderate agricultural tasks on flat terrain but may struggle in slippery or uneven conditions. It offers either a 3-speed or 4-speed transmission, enhancing versatility for various field operations; however, the limited gear range may hinder performance in more demanding conditions. Users should be mindful of the tractor's capability for larger implements, as its power output may not suffice for heavy-duty tasks.
| Chassis | 4x2 2WD |
| Transmissions | 3-speed/4-speed |
ALLIS CHALMERS U TIRES
The Allis Chalmers U tractor features 6.00x16 front and 12.75x24 rear agricultural tires, providing a balanced combination of load capacity and traction. This configuration is advantageous for small to medium-scale farming operations, offering good maneuverability and stability on uneven terrains. However, the relatively narrow tire width may limit flotation on soft soils, potentially causing bogging in wet conditions.
| Ag front | 6.00x16 |
| Ag rear | 12.75x24 |
DIMENSIONS
| Length | 118.5inches / 300cm |
| Width | 63.1inches / 160cm |
| Height | 53.5inches / 135cm |
| Weight | 4,600lbs / 2086kg |
DIMENSIONS & TIRES
The Allis Chalmers U tractor, weighing 4,600 lbs (2086 kg), features front tires sized 28x6 and rear tires 42x11, providing a stable and balanced load distribution. Its considerable rear tire size offers enhanced traction and increased ground contact area, which is beneficial for plowing and heavy-duty applications. However, the narrower front tires may challenge stability on uneven terrain, thus requiring careful operation in rugged conditions.
| Weight | 4,600lbs / 2086kg |
| Front tire | 28x6 |
| Rear tire | 42x11 |
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 | (none) |
| 1946 | (none) |
| 1947 | 18309, 20174 |
| 1948 | 18613, 20179, 21000 |
| 1949 | 20301, 210036, 22018 |
| 1950 | 20422, 22024 |