Introduction
Allis-Chalmers HD3 Agricultural Crawler Tractor
The Allis-Chalmers HD3 is an agricultural crawler tractor produced between 1960 and 1968 in Springfield, Illinois, USA. Based on the mechanical platform of the Allis-Chalmers D15 farm tractor, this machine was designed for specialized agricultural operations requiring the traction and stability of a tracked vehicle.
Engine and Performance
The tractor is powered by an Allis-Chalmers 4-cylinder, liquid-cooled diesel engine with a displacement of 175 cubic inches (2.9 liters). It features a bore and stroke of 3.562 by 4.375 inches and operates at a rated speed of 1650 RPM. Fuel delivery is managed by a Roosa-Master injection pump, and the engine utilizes an oil bath air cleaner for operation in dusty environments. The system relies on a 12-volt electric starter.
Transmission and Drive
The HD3 offers two primary transmission configurations. The Power Director system provides 8 forward and 2 reverse gears, utilizing a two-speed power shift with a wet disc clutch. Alternatively, a mechanical shuttle transmission is available with 4 forward and 4 reverse gears. Steering is achieved through mechanical clutches, and the machine is brought to a stop using mechanical contracting band brakes.
Hydraulics and PTO
The hydraulic system is of the open-center type, featuring a standard pump flow of 15 gallons per minute (56.8 liters per minute), with an optional capacity of 25 gallons per minute (94.6 liters per minute) available. The system has a hydraulic capacity of 16.5 gallons (62.5 liters) and supports between 1 and 3 valves. A rear PTO is available as an option, providing a standard 540 RPM output.
Dimensions and Undercarriage
The tractor is equipped with 7-inch wide tracks designed to provide consistent soil contact and traction. The total weight of the unit is 7645 lbs (3467 kg), which contributes to its stability for field work and moderate pulling tasks.
Conclusion
With a power rating of 36 hp, the Allis-Chalmers HD3 is a compact crawler intended for agricultural applications where soil compaction must be minimized and traction is prioritized. Its mechanical simplicity and reliance on proven D15 components make it a durable choice for historical farm equipment enthusiasts and specific niche agricultural tasks.
Production Information of Allis Chalmers, HD3
- The Allis-Chalmers H3 crawler was based on the diesel-powered D15 farm tractor.
- Agricultural Crawler tractor
- Built in Springfield, Illinois, USA
| Manufacturer | Allis Chalmers |
|---|
Engine Specifications of Allis Chalmers, HD3
- Allis Chalmers
- Liquid-cooled
- Diesel
- 4-cylinder
| Starter volts | 12 |
|---|---|
| Displacement | 175 ci [2.9 L] |
| Air cleaner | Oil bath |
| Bore/Stroke | 3.562x4.375 inches [90 x 111 mm] |
| Coolant capacity | 9 qts [8.5 L] |
| Starter | Electric |
| Rated RPM | 1650 |
| Fuel system | Roosa-Master injection pump |
Transmission Information of Allis Chalmers, HD3
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, HD3
- Open operator station.
- Mechanical contracting band brakes
| Drive | Crawler |
|---|---|
| Steering | Mechanical clutches |
Power Information of Allis Chalmers, HD3
| Rear PTO | Optional |
|---|---|
| Rear PTO Type | 540 |
Hydraulics Specifications of Allis Chalmers, HD3
| 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 36 hp[P] HP, the Allis Chalmers HD3 sits between M (35 HP) and D14 (37 HP) in Allis Chalmers's range. Its power puts it in the 25th percentile of 1960s models in our database (709 machines).
Frequently asked questions
How much horsepower does the Allis Chalmers HD3 have?
The Allis Chalmers HD3 delivers 36 hp[P] HP.
What years was the Allis Chalmers HD3 produced?
The Allis Chalmers HD3 was produced in 1960-1968.
What engine does the Allis Chalmers HD3 have?
The Allis Chalmers HD3 is powered by a Diesel, 4-cylinder engine.
What transmission does the Allis Chalmers HD3 use?
The Allis Chalmers HD3 uses a Power Director transmission.