| Manufacturer | Allis Chalmers |
| Price | - |
| Model | 20-35 |
| Equipment Type | Standard-Tread Tractors |
| Factory | West Allis, Wisconsin, USA |
NEBRASKA TRACTOR TEST 83
| Description | Gasoline 2-speed 2WD/September 15 - 24, 1921/Link: Nebraska Tractor Test 83 file/Drawbar performance |
| Belt power (max) | 43.73 hp/32.6 kW |
| Belt fuel use (max) | 4.7 gal/hour/17.8 l/hour |
| Max power | 25.45 hp/19.0 kW |
| Max pull | 3075 lbs/1394 kg |
NEBRASKA TRACTOR TEST 151 2
| Description | Gasoline 2-speed 2WD/June 19 - 26, 1928/Link: Nebraska Tractor Test 151 file/Drawbar performance |
| Belt power (max) | 44.29 hp/33.0 kW |
| Belt fuel use (max) | 5.0 gal/hour/18.9 l/hour |
| Max power | 33.20 hp/24.8 kW |
| Max pull | 4,400 lbs/1995 kg |
ALLIS CHALMERS 20-35 POWER
| Drawbar (claimed) | 20 hp/14.9 kW |
| Belt (claimed) | 35 hp/26.1 kW |
| Drawbar (tested) | 33.20 hp/24.8 kW |
| Belt (tested) | 44.29 hp/33.0 kW |
ENGINE DETAIL
The Allis Chalmers 20-35 tractor features a robust 4-cylinder gasoline engine with a large displacement of 460.7 ci (7.6 L), providing ample power for diverse agricultural tasks. With a low rated RPM of 930, its torque characteristics favor heavy pulling and consistent performance at low speeds, although this may limit high-speed operation. The oil bath air cleaner enhances filtration efficiency but requires regular maintenance to prevent clogging, ensuring optimal engine performance under various conditions.
| Description | Allis Chalmers/gasoline/4-cylinder/liquid-cooled vertical valve-in-head |
| Displacement | 460.7 ci/7.6 L |
| Bore/Stroke | 4.75x6.50 inches/121 x 165 mm |
| Fuel system | Kingston L 1.5 |
| Air cleaner | oil bath |
| Rated RPM | 930 |
| Coolant capacity | 40 qts/37.9 L |
ALLIS CHALMERS 20-35 ENGINE
The Allis Chalmers 20-35 is powered by a robust 7.6L 4-cylinder gasoline engine, providing a balance of power and efficiency for medium-duty agricultural tasks. With a substantial 25-gallon fuel tank, it allows for extended operation between refueling, making it suitable for larger fieldwork scenarios. However, operational costs may vary due to gasoline consumption, which should be considered for extensive use compared to diesel alternatives.
| Description | Allis Chalmers 7.6L 4-cyl gasoline |
| Fuel tank | 25 gal/94.6 L |
| Aux. fuel | 7.75 gal/29.3 L |
TRANSMISSION
The Allis Chalmers 20-35 tractor features an unsynchronized gear transmission, which may pose a challenge during gear shifts under load, increasing the potential for wear on the gearbox. With only 2 forward gears and 1 reverse, its operational versatility can be limited for varied tasks, making it best suited for lighter, straightforward agricultural applications. The hand-operated expanding shoe clutch provides simplicity but may require more frequent operator skill for smooth engagement and disengagement compared to modern hydraulic alternatives.
| Type | unsynchronized gear |
| Gears | 2 forward and 1 reverse |
| Clutch | hand-operated expanding shoe |
MECHANICAL
The Allis Chalmers 20-35 features a 4x2 2WD chassis, which provides good traction on flat terrain but may struggle in muddy or uneven conditions, limiting its versatility. The manual steering system can be less responsive compared to power steering systems, potentially requiring more effort during extended operation. Its 2-speed unsynchronized transmission allows for simple gear selection, making it user-friendly for basic tasks, though it may limit efficiency in varying speed applications.
| Chassis | 4x2 2WD |
| Steering | manual |
| Cab | Open operator station. |
| Transmission | 2-speed unsynchronized gear |
ALLIS CHALMERS 20-35 TIRES
The Allis Chalmers 20-35 tractor features a robust Ag front tire size of 36x6, providing excellent maneuverability in tight spaces, while the 50x12 rear tires enhance traction and stability during heavy loads. The use of steel rims contributes to durability but may limit shock absorption compared to rubber options, potentially affecting operator comfort on rough terrain. Its design makes it suitable for farming tasks requiring both agility in row crops and the capacity to handle larger implements.
| Ag front | 36x6 steel |
| Ag rear | 50x12 steel |
DIMENSIONS
| Length | 135 inches/342 cm |
| Width | 66 inches/167 cm |
| Height | 68 inches/172 cm |
| Weight | 6640 lbs/3011 kg |
DIMENSIONS & TIRES
The Allis Chalmers 20-35 tractor, weighing 6,640 lbs (3,011 kg), features robust tire dimensions of 36x6 in the front and 50x12 in the rear, which provide excellent traction and stability on various terrains. The weight distribution contributes to effective ground engagement, making it suitable for heavy-duty agricultural tasks. However, the tractor's size and weight may pose challenges in tight maneuvering situations and transport restrictions on public roads.
| Weight | 6640 lbs/3011 kg |
| Front tire | 36x6 |
| Rear tire | 50x12 |
20-35 SERIAL NUMBERS
| 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. |
| 1923 | 6161 |
| 1924 | 6397 |
| 1925 | 6755 |
| 1926 | 7369 |
| 1927 | 8070 |
| 1928 | 9870 |
| 1929 | 16762 |
| 1930 | 23252 |
| Final | 24185 |
| Description | /how to read serial numbers.../ |
BELT PULLEY
| Diameter | 13 inches/33 cm |
| Width | 8.5 inches/21 cm |
| RPM | 930 |