Allis Chalmers
Allis Chalmers 20-35
The Allis Chalmers 20-35 is a standard-tread tractor built from 1922 to 1930 in West Allis, Wisconsin, USA. It features a 7.6L 4-cylinder gasoline engine producing an estimated 38.9 hp. The tractor has a 2-speed unsynchronized gear transmission with hand-operated expanding shoe clutch. It offers 20 hp drawbar power claimed and 33.20 hp tested, with belt power up to 44.29 hp tested. The tractor weighs 6640 lbs and rides on 36x6 front and 50x12 rear steel tires. It has manual steering and an open operator station. The 20-35 succeeded the 18-30 model and was later replaced by the 25-40.
Power38 hp[B]
Founded1922 - 1930
Model20-35
Technical Specifications
Detailed specifications and technical data for Allis Chalmers 20-35
Power
| Belt (tested) | 44.29 hp (33.0 kW) |
|---|---|
| Belt (claimed) | 35 hp (26.1 kW) |
| Drawbar (tested) | 33.20 hp (24.8 kW) |
| Drawbar (claimed) | 20 hp (14.9 kW) |
Engine
| Type | liquid-cooled vertical valve-in-head |
|---|---|
| Aux. fuel | 7.75 gal (29.3 L) |
| Fuel tank | 25 gal (94.6 L) |
| Rated RPM | 930 |
| Air cleaner | oil bath |
| Bore/Stroke | 4.75x6.50 inches (121 x 165 mm) |
| Fuel system | Kingston L 1.5" carburetor |
| Displacement | 460.7 ci (7.6 L) |
| Engine Detail | Allis Chalmers 7.6L 4-cyl gasoline |
| Coolant capacity | 40 qts (37.9 L) |
Mechanical
| Drive | Two-wheel drive |
|---|---|
| Steering | Manual steering |
| Operator station | Open operator station |
Production
| Type | Standard-tread tractor |
|---|---|
| Notes | When the Allis-Chalmers E 18-30 was re-tested in 1921 at 930 RPM, it produced a rated 38 belt horsepower. The tractor was re-named the 20-35. |
| Built in | West Allis, Wisconsin, USA |
| Manufacturer | Allis Chalmers |
| Production years | 1922 - 1930 |
Belt Pulley
| RPM | 930 |
|---|---|
| Width | 8.5 inches (21 cm) |
| Diameter | 13 inches (33 cm) |
Transmission
| Type | unsynchronized gear |
|---|---|
| Gears | 2 forward and 1 reverse |
| Clutch | hand-operated expanding shoe |
Serial Numbers
| 1923 | 6161 |
|---|---|
| 1924 | 6397 |
| 1925 | 6755 |
| 1926 | 7369 |
| 1927 | 8070 |
| 1928 | 9870 |
| 1929 | 16762 |
| 1930 | 23252 |
| Final | 24185 |
| Location | Serial number on a plate in front of the steering wheel until 1927. After, the serial number is front of shifter on transmission case. |
Dimensions & Tires
| Width | 66 inches (167 cm) |
|---|---|
| Height | 68 inches (172 cm) |
| Length | 135 inches (342 cm) |
| Weight | 6640 lbs (3011 kg) |
| Rear tire | 50x12 steel |
| Front tire | 36x6 steel |
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