| Manufacturer | Allis Chalmers |
| Price | - |
| Model | 25-40 |
| Equipment Type | Standard-Tread Tractors |
| Factory | West Allis, Wisconsin, USA |
NEBRASKA TRACTOR TEST 193 2
| Description | Distillate 2-speed 2WD/June 18 - 25, 1931/Link: Nebraska Tractor Test 193 file/Drawbar performance/Gear 1 used for power test./Gear 1 used for pull test. |
| Belt power (max) | 47.00 hp/35.0 kW |
| Belt fuel use (max) | 5.5 gal/hour/20.8 l/hour |
| Max power | 33.82 hp/25.2 kW |
| Max pull | 4,133 lbs/1874 kg |
ALLIS CHALMERS 25-40 POWER
| Drawbar (claimed) | 27 hp/20.1 kW |
| Belt (claimed) | 42.6 hp/31.8 kW |
| Drawbar (tested) | 33.82 hp/25.2 kW |
| Belt (tested) | 47.00 hp/35.0 kW |
ENGINES OVERVIEW
The Allis Chalmers 25-40 tractor features robust 8.4L and 9.2L 4-cylinder gasoline engines, providing ample power for heavy-duty agricultural tasks. Its fuel efficiency can be a significant advantage in extensive field operations, though the larger engine may present challenges with increased maintenance and operational costs. Ideal for medium to large farms, this tractor is suitable for tasks such as plowing, cultivating, and haulage, but users should prepare for the weight and size constraints during transport.
| Description | Allis Chalmers 8.4L 4-cyl gasoline/Allis Chalmers 9.2L 4-cyl |
ENGINE DETAIL 1
The Allis Chalmers 25-40 features a robust 4-cylinder, gasoline-powered engine with a significant displacement of 510.5 ci (8.4 L), offering strong torque for agricultural tasks. Its large bore and stroke (5.00x6.50 inches) enhance low-end power, though the 1000 RPM rated speed may limit high-speed applications. With a coolant capacity of 40 quarts, the liquid cooling system ensures stable operating temperatures, vital for prolonged operational periods in demanding conditions.
| Description | Allis Chalmers/gasoline/4-cylinder/liquid-cooled vertical I-head |
| Displacement | 510.5 ci/8.4 L |
| Bore/Stroke | 5.00x6.50 inches/127 x 165 mm |
| Rated RPM | 1000 |
| Coolant capacity | 40 qts/37.9 L |
ENGINE DETAIL 2
The Allis Chalmers 25-40 tractor features a robust 4-cylinder engine with a significant displacement of 563 ci (9.2 L), allowing for enhanced torque output suitable for heavy-duty tasks. Its bore and stroke dimensions (5.25x6.50 inches) indicate a design optimized for low-end power, improving performance in demanding agricultural scenarios. However, the large engine size may lead to increased fuel consumption and maintenance challenges over time.
| Description | Allis Chalmers/4-cylinder |
| Displacement | 563 ci/9.2 L |
| Bore/Stroke | 5.25x6.50 inches/133 x 165 mm |
ALLIS CHALMERS 25-40 ENGINES
The Allis Chalmers 25-40 tractor features a robust 8.4L or 9.2L four-cylinder gasoline engine, providing excellent torque for heavy-duty applications. Its 30-gallon fuel capacity ensures prolonged operational efficiency, while the 1-gallon auxiliary fuel tank can be beneficial for small engine performance or emergency needs. However, operators should consider the weight-to-power ratio during transport, as the larger engine adds substantial weight which may affect maneuverability in tight spaces.
| Description | Allis Chalmers 8.4L 4-cyl gasoline/Allis Chalmers 9.2L 4-cyl |
| Fuel tank | 30 gal/113.6 L |
| Aux. fuel | 1 gal/3.8 L |
TRANSMISSION
The Allis Chalmers 25-40 tractor's gear type is a simple sliding spur gear, providing straightforward operation but limited gear selection with only 2 forward and 1 reverse gear. This configuration can be advantageous for farmers seeking ease of use in flat, open fields but may present challenges in varied terrain or when optimal speed and torque adjustments are necessary. Its design suits smaller agricultural tasks where maneuverability and low-speed operations are prioritized.
| Type | gear |
| Gears | 2 forward and 1 reverse |
MECHANICAL
The Allis Chalmers 25-40 tractor features a 4x2 2WD chassis, which is suitable for light to moderate agricultural tasks, providing ease of maneuverability on even ground but limited traction in adverse conditions. The manual steering offers simplicity but may require more effort during prolonged use compared to power-assisted systems, especially in tight turns. Its 2-speed gear transmission allows for basic speed control, but farmers may find performance constraints on varied terrain compared to multi-speed or hydrostatic options, making it ideal for smaller plots rather than extensive acreage.
| Chassis | 4x2 2WD |
| Steering | manual |
| Cab | Open operator station. |
| Transmission | 2-speed gear |
ALLIS CHALMERS 25-40 TIRES
The Allis Chalmers 25-40 tractor features robust 36x6 front and 50x12 rear steel wheels, providing excellent stability and traction on various terrains. The tire size indicates suitability for heavier loads and improved ground contact, which is advantageous for farming operations. However, the steel construction can result in reduced ride comfort and potential soil compaction, making it less ideal for delicate soil conditions.
| Ag front | 36x6 steel |
| Ag rear | 50x12 steel |
DIMENSIONS
| Length | 152 inches/386 cm |
| Width | 76 inches/193 cm |
| Height | 65 inches/165 cm |
| Weight | 7,000 lbs/3175 kg |
DIMENSIONS & TIRES
The Allis Chalmers 25-40 tractor, weighing 7,000 lbs (3,175 kg), features a substantial front tire size of 36x6, providing stability, while the large rear tires (50x12) enhance traction for heavy-duty applications. This configuration is advantageous for farm operations requiring mobility across various terrains, though the weight and tire dimensions may present challenges in tight spaces or on softer ground. Properly managing load distribution will ensure optimal performance, especially when using implements that increase the rear weight.
| Weight | 7,000 lbs/3175 kg |
| Front tire | 36x6 |
| Rear tire | 50x12 |
25-40 SERIAL NUMBERS
| Location | front of shifter on transmission case |
| 1930 | 24186 |
| 1931 | 24843 |
| 1932 | 24972 |
| 1933 | 25024 |
| 1934 | 25062 |
| 1935 | 25309 |
| 1936 | 25582 |
| Final | 25611 |