Introduction
Allis-Chalmers H3 Crawler Tractor
The Allis-Chalmers H3 is a specialized agricultural crawler tractor manufactured between 1960 and 1967 in Springfield, Illinois, USA. Developed from the architecture of the D15 farm tractor, this machine was engineered to provide high traction and stability in varied agricultural environments.
Engine and Powertrain
The tractor is powered by a 149 cubic-inch (2.4 L) liquid-cooled, 4-cylinder gasoline engine. It utilizes a Marvel-Schebler carburetor for fuel management and an oil bath air cleaner to maintain engine longevity in dusty field conditions. The compression ratio is set at 7.5:1, and the unit operates at a rated speed of 1650 RPM.
Transmission and Steering
The H3 features a Power Director transmission system, which incorporates a two-speed power shift providing 8 forward and 2 reverse gears. An alternative 4-speed mechanical shuttle configuration was also available. Steering is managed via mechanical clutches, while braking is achieved through mechanical contracting band brakes, ensuring precise control over the crawler's movement.
Hydraulics and PTO
The hydraulic system is an open-center design with a standard pump flow of 15 gpm (56.8 lpm), with an optional capacity of 25 gpm (94.6 lpm). The system supports between 1 and 3 valves, allowing for the operation of various implements. The tractor is equipped with a 540 RPM rear power take-off (PTO).
Dimensions and Chassis
The tractor is built on a 64-inch (162 cm) wheelbase and utilizes 7-inch tracks to distribute its 7,395 lbs (3,354 kg) weight. This configuration is intended to minimize ground pressure while maximizing grip on uneven or soft terrain.
Conclusion
The Allis-Chalmers H3 is a robust, purpose-built crawler tractor designed for agricultural tasks requiring superior traction and stability. Its combination of a gasoline engine, multi-range transmission, and crawler drive system makes it a reliable choice for field operations where wheeled tractors may face limitations.
Production Information of Allis Chalmers, H3
- The Allis-Chalmers H3 crawler was based on the gas-powered D15 farm tractor.
- Agricultural Crawler tractor
- Built in Springfield, Illinois, USA
| Manufacturer | Allis Chalmers |
|---|
Engine Specifications of Allis Chalmers, H3
- Allis Chalmers
- Liquid-cooled
- Gasoline
- 4-cylinder
| Starter | Electric |
|---|---|
| Displacement | 149 ci [2.4 L] |
| Air cleaner | Oil bath |
| Bore/Stroke | 3.50x3.875 inches [89 x 98 mm] |
| Coolant capacity | 9 qts [8.5 L] |
| Starter volts | 12 |
| Rated RPM | 1650 |
| Compression | 7.5:1 |
| Fuel system | Marvel-Schebler carburetor |
Transmission Information of Allis Chalmers, H3
Transmission variants 1
- Four gears (1-4) plus reverse (R) with two-speed high/low power shift.
| Transmission | Power Director |
|---|---|
| Transmission(optional) | Dry disc (gear) |
| Clutch | Wet disc (Power Director) |
| Type | Two-speed power shift |
| Gears | 8 forward and 2 reverse |
Transmission variants 2
| Type | Mechanical shuttle |
|---|---|
| Gears | 4 forward and reverse |
- 8-speed two-speed power shift
- 4-speed mechanical shuttle
Mechanical Specs of Allis Chalmers, H3
- Open operator station.
- Mechanical contracting band brakes
| Drive | Crawler |
|---|---|
| Steering | Mechanical clutches |
Power Information of Allis Chalmers, H3
| Rear PTO | Optional |
|---|---|
| Rear PTO Type | 540 |
Hydraulics Specifications of Allis Chalmers, H3
| Type | Open center |
|---|---|
| Type(optional) | 25 gpm (optional) [94.6 lpm] |
| Pump flow | 15 gpm [56.8 lpm] |
| Capacity | 16.5 gal [62.5 L] |
| Valves | 1 to 3 |
Where it sits
With 35 hp[P] HP, the Allis Chalmers H3 sits between UC (34 HP) and HD3 (36 HP) in Allis Chalmers's range. Its power puts it in the 24th percentile of 1960s models in our database (709 machines).
Frequently asked questions
How much horsepower does the Allis Chalmers H3 have?
The Allis Chalmers H3 delivers 35 hp[P] HP.
What years was the Allis Chalmers H3 produced?
The Allis Chalmers H3 was produced in 1960-1967.
What engine does the Allis Chalmers H3 have?
The Allis Chalmers H3 is powered by a Gasoline, 4-cylinder engine.
What transmission does the Allis Chalmers H3 use?
The Allis Chalmers H3 uses a Power Director transmission.