Allis-Chalmers HD20 Specs ( 1951-1954 )
Overview
The Allis-Chalmers HD20 is an agricultural crawler tractor manufactured in Springfield, Illinois, between 1951 and 1954, with a total production of 3,100 units. It features a General Motors 10.8L 6-cylinder diesel engine with a 2-cycle vertical I-head design, producing a net engine power of 175 hp. The mechanical configuration includes an open operator station and a 2-speed torque converter transmission with two forward gears and one reverse gear.
Ideal Applications
Tested Drawbar Performance:
In Nebraska Tractor Test 465, the HD20 achieved a maximum drawbar pull of 30,464 lbs and recorded a maximum power of 116.7 hp.
Engine and Fuel Specifications:
The liquid-cooled diesel engine is equipped with a 120-gallon fuel tank and has a displacement of 660 cubic inches with an 18.0:1 compression ratio.
Physical Dimensions and Drive System:
This crawler tractor has an operating weight of 41,000 lbs, measures 191 inches in length, and is built on a track-based drive system for agricultural applications.
Production
| Description | Agricultural Crawler tractor / Built in Springfield, Illinois, USA |
|---|---|
| Manufacturer | Allis Chalmers |
| Total built | 3,100 |
Engine
| Engine type | General Motors 10.8L 6-cyl diesel |
|---|---|
| Fuel tank | 120 gal (454.2 L) |
| Bore/Stroke | 5.00x5.60 inches (127 x 142 mm) |
| Compression | 18.0:1 |
| Coolant capacity | 60 qts (56.8 L) |
| Description | General Motors / blower diesel / 6-cylinder / liquid-cooled 2-cycle vertical I-head |
| Displacement | 660 ci (10.8 L) |
| Power (net) | 175 hp (130.5 kW) |
| Rated RPM | 1700 |
| Starter volts | 24 |
| Drawbar (claimed) | 117 hp (87.2 kW) |
| Drawbar (tested) | 116.7 hp (87.0 kW) |
| Engine (net) | 175 hp (130.5 kW) |
Transmission
| Gears | 2 forward and 1 reverse |
|---|---|
| Transmission type | 2-speed torque converter |
| Type | torque converter |
Mechanical
| Cab | Open operator station. |
|---|---|
| Drive | crawler |
Dimensions & Tires
| Height | 95 inches (241 cm) |
|---|---|
| Length | 191 inches (485 cm) |
| Weight | 41000 lbs (18597 kg) |
Dimensions & Tracks
| Description | Tracks |
|---|---|
| Weight | 41000 lbs (18597 kg) |
HD20 Serial Numbers
| 1951 | 3001 |
|---|---|
| 1952 | 3828 |
| 1953 | 4923 |
| 1954 | 5737 |
| Description | FAQ: How to read a serial number table. |
| Location: | Steering clutch housing or instrument panel |
Nebraska Tractor Test 465
| Description | July 1951 / Drawbar performance |
|---|---|
| Max power | 116.7 hp (87.0 kW) |
| Max pull | 30,464 lbs (13818 kg) |