Allis Chalmers S

The Allis Chalmers S is a tractor produced by Allis Chalmers. It is equipped with a 675.1 ci 11.1 L engine. The rated power output is 74.82 hp 55.8 kW. Transmission: 5 forward and 1 reverse. Drive type: crawler. Operating weight: 20100 lbs 9117 kg.

Overview

	1937 - 1942 Agricultural Crawler tractor
1937 - 1942
Agricultural Crawler tractor

Production
Manufacturer	Allis Chalmers
Agricultural Crawler tractor
Built in Springfield, Illinois, USA
Total built	1,225

Variants
S	gasoline
SO	spark-ignition diesel
WS	wide

Allis Chalmers S Transmission
5-speed gear
Transmission details ...

Allis Chalmers S Power
Drawbar (claimed)	48 hp 35.8 kW
Belt (claimed)	66 hp 49.2 kW
Drawbar (tested)	68.9 hp 51.4 kW
PTO (tested)	84.3 hp 62.9 kW
Belt (tested)	74.82 hp 55.8 kW
Performance test details ...

Mechanical
Drive	crawler
Open operator station.

Dimensions & Tracks
Weight	20100 lbs 9117 kg
18-inch tracks
Full dimensions and tracks ...

References
Build a Better Farm published in 1940, by Allis Chalmers

Engine

Engine options
Allis Chalmers 11.1L 4-cyl diesel
Allis Chalmers 11.1L 4-cyl gasoline

Engine Detail — 675.1 ci / 11.1 L Diesel

Manufacturer	Allis Chalmers
Fuel Type	Diesel
Configuration	4-cylinder, liquid-cooled vertical I-head
Oil engine, burned diesel with fuel injection and spark ignition, used on the SO model
Displacement	675.1 ci 11.1 L
Bore/Stroke	5.75x6.50 inches 146 x 165 mm
Fuel system	mechancal injection
Air cleaner	oil bath
Compression	6.5:1
Rated RPM	1050
Starter volts	6
Coolant capacity	50 qts 47.3 L

Engine Detail — 675.1 ci / 11.1 L Gasoline

Manufacturer	Allis Chalmers
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled vertical I-head
Displacement	675.1 ci 11.1 L
Bore/Stroke	5.75x6.50 inches 146 x 165 mm
Compression	5:1
Rated RPM	1050
Starter volts	6
Oil capacity	20 qts 18.9 L

Transmission

Transmission — 5 forward and 1 reverse gear

Type	gear
Gears	5 forward and 1 reverse
Clutch	dry disc
Oil capacity	23 qts 21.8 L

Dimensions

Allis Chalmers S Tracks
Width	18 inches 45 cm
Length on ground	77.1 inches 195 cm
Area on ground	2775 in² 1.8 m²
Ground pressure	6.74 psi 0.5 bar

Dimensions
Length	146 inches 370 cm
Width	97 inches 246 cm
Height	74 inches 187 cm
Weight	20100 lbs 9117 kg
Gauge	62 inches 157 cm

Tests

Tractor Tests
NTTL 286: diesel 5-speed crawler
NTTL 337: gasoline 5-speed crawler

Nebraska Tractor Test 286
Diesel 5-speed crawler September 16 - 25, 1937 Link: Nebraska Tractor Test 286 file
Belt power (max)	74.82 hp 55.8 kW
Belt fuel use (max)	6.0 gal/hour 22.7 l/hour
Drawbar performance
Max power	62.97 hp 47.0 kW
Gear 1 used for power test.
Max pull	16732 lbs 7589 kg
Gear 1 used for pull test.

Nebraska Tractor Test 337
Gasoline 5-speed crawler November 18 - 24, 1939 Link: Nebraska Tractor Test 337 file
PTO performance
Max power	84.3 hp 62.9 kW
Fuel use	8.2 gal/hour 31.0 l/hour
Drawbar performance
Max power	68.9 hp 51.4 kW
Max pull	11,367 lbs 5156 kg

Photos

Allis Chalmers S

Allis Chalmers S

Allis Chalmers S

Allis Chalmers S operator station and controls.