Allis-Chalmers S Specs ( 1937-1942 )
Overview
The Allis-Chalmers Model S is an agricultural crawler tractor produced in Springfield, Illinois, between 1937 and 1942, with a total production run of 1,225 units. It features an 11.1L four-cylinder engine available in gasoline or diesel configurations, supported by 18-inch tracks and a 5-speed gear transmission.
Ideal Applications
Tested Power Output:
Nebraska Tractor Test 337 recorded a maximum belt power of 84.3 hp and a drawbar power of 68.9 hp for the gasoline version, while the diesel version reached 74.82 hp on the belt and 62.97 hp at the drawbar.
Traction and Ground Pressure:
The unit is equipped with 18-inch tracks providing 2,775 square inches of area on the ground, resulting in a calculated ground pressure of 6.74 psi for the 20,100-pound machine.
Fuel and Mechanical Capacity:
The tractor is configured with a 64-gallon fuel tank, a 50-quart coolant capacity, and a 5-speed forward transmission system utilizing a dry disc clutch.
Production
| Description | Agricultural Crawler tractor / Built in Springfield, Illinois, USA |
|---|---|
| Manufacturer | Allis Chalmers |
| Total built | 1,225 |
Engine
| Engine type | Allis Chalmers 11.1L 4-cyl diesel / Allis Chalmers 11.1L 4-cyl gasoline |
|---|---|
| Fuel tank | 64 gal (242.2 L) |
| Air cleaner | oil bath |
| Bore/Stroke | 5.75x6.50 inches (146 x 165 mm) / 5.75x6.50 inches (146 x 165 mm) |
| Compression | 6.5:1 / 5:1 |
| Coolant capacity | 50 qts (47.3 L) |
| Description | Allis Chalmers / diesel / 4-cylinder / liquid-cooled vertical I-head / Oil engine, burned diesel with fuel injection and spark ignition, used on the SO model / Allis Chalmers / gasoline / 4-cylinder / liquid-cooled vertical I-head |
| Displacement | 675.1 ci (11.1 L) / 675.1 ci (11.1 L) |
| Fuel system | mechancal injection |
| Oil capacity | 20 qts (18.9 L) |
| Rated RPM | 1050 / 1050 |
| Starter volts | 6 / 6 |
| Engine type | Allis Chalmers 11.1L 4-cyl diesel / Allis Chalmers 11.1L 4-cyl gasoline |
| Belt (claimed) | 66 hp (49.2 kW) |
| Belt (tested) | 74.82 hp (55.8 kW) |
| Drawbar (claimed) | 48 hp (35.8 kW) |
| Drawbar (tested) | 68.9 hp (51.4 kW) |
| PTO (tested) | 84.3 hp (62.9 kW) |
Transmission
| Clutch | dry disc |
|---|---|
| Gears | 5 forward and 1 reverse |
| Oil capacity | 23 qts (21.8 L) |
| Transmission type | 5-speed gear |
| Type | gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Drive | crawler |
Dimensions & Tires
| Gauge | 62 inches (157 cm) |
|---|---|
| Height | 74 inches (187 cm) |
| Length | 146 inches (370 cm) |
| Weight | 20100 lbs (9117 kg) |
| Width | 97 inches (246 cm) |
Allis Chalmers S Tracks
| Area on ground | 2775 in² (1.8 m²) |
|---|---|
| Ground pressure | 6.74 psi (0.5 bar) |
| Length on ground | 77.1 inches (195 cm) |
| Width | 18 inches (45 cm) |
Dimensions & Tracks
| Description | 18-inch tracks |
|---|---|
| Weight | 20100 lbs (9117 kg) |
Nebraska Tractor Test 286
| Belt fuel use (max) | 6.0 gal/hour (22.7 l/hour) |
|---|---|
| Belt power (max) | 74.82 hp (55.8 kW) |
| Description | Diesel 5-speed crawlerSeptember 16 - 25, 1937Link: Nebraska Tractor Test 286 file / Drawbar performance / Gear 1 used for power test. / Gear 1 used for pull test. |
| Max power | 62.97 hp (47.0 kW) |
| Max pull | 16732 lbs (7589 kg) |
Nebraska Tractor Test 337
| Description | Gasoline 5-speed crawlerNovember 18 - 24, 1939Link: Nebraska Tractor Test 337 file / PTO performance / Drawbar performance |
|---|---|
| Fuel use | 8.2 gal/hour (31.0 l/hour) |
| Max power | 84.3 hp (62.9 kW) / 68.9 hp (51.4 kW) |
| Max pull | 11,367 lbs (5156 kg) |
References
| Description | Build a Better Farm published in 1940, by Allis Chalmers |
|---|
S Serial Numbers
| 1937 | 3 |
|---|---|
| 1938 | 413 |
| 1939 | 585 |
| 1940 | 1085 |
| 1941 | 1128 |
| 1942 | 1212 |
| Description | FAQ: How to read a serial number table. |
| Last | 1227 |
| Location: | transmission case or instrument panel |
Tractor Tests
| Description | NTTL 286: diesel 5-speed crawler / NTTL 337: gasoline 5-speed crawler |
|---|
Variants
| S | gasoline |
|---|---|
| SO | spark-ignition diesel |
| WS | wide |