Allis Chalmers B

Last Updated: July 2024

Overview

The Allis Chalmers B is a 2WD row-crop tractor, which was manufactured by Allis Chalmers from 1938 to 1957. It features a manual steering system, differential mechanical contracting band brakes, and was available with an open operator station or an optional canvas cab. The Allis Chalmers B came equipped with a 1.9 L (113.0 cu·in), 1.9 L (116.1 cu·in) or 2.1 L (125.2 cu·in) four-cylinder gasoline engine from Waukesha. The unsynchronized gear transmission with dry disc clutch provides 3 forward and 1 reverse gears. According to independent test results from the University of Nebraska Tractor Test Laboratory, the tractor achieved a maximum belt horsepower of 15.68 HP at 1540 RPM, a maximum drawbar horsepower of 12.97 HP, and a drawbar horsepower efficiency of 13.54 HP (sea level calculated). The engine was equipped with a Zenith 61A7 carburetor (size 1.125") and had an oil capacity of 1.554 gallons (to motor) and 1.685 gallons (drained from motor). The belt pulley had a diameter of 9.5", a face of 5.25", and operated at 1050 RPM. The front tires were 5.00" x 15" with 22 psi, and the rear tires were 7.00" x 24" with 12 psi air pressure. The total operating weight as tested was 2605 lb.

Key Specifications

Category: Row Crop

Transmission: Unsynchronized gear

Drive Type: 2WD

Operating Weight: 2605

Fuel Type: Gasoline

Allis Chalmers B vs. Similar Tractors

Operating Weight

Below Average

Greater than 15% of similar tractors.

Technical Specifications

Engine

Manufacturer: Waukesha
Model: BE, CE, or Waukesha
Cooling Type: Liquid-cooled
Cylinder Orientation: Inline
Valve Configuration: -
Fuel Type: Gasoline
Induction Type: Naturally aspirated
Cylinders: 4
Displacement (ci): Varies (113.0, 116.1, 125.2)
Bore (in): Varies (2.99, 3.27, 3.37)
Stroke (in): 4.02/3.5
Rated RPM: 1400, 1540
Power Output (hp): -

Transmission

Type: Unsynchronized gear
Forward Gears: 3
Reverse Gears: 1
Total Gears: -

Dimensions

Length (in): 110.25
Width (in): 52.7 (minimum)
Height (in): 76.75 (exhaust)
Operating Weight (lb): 2605

Power Take-Off (PTO)

PTO Type: Transmission
PTO Speed 1 (rpm): 540
PTO Speed 2 (rpm): -
PTO Speed 3 (rpm): -

Miscellaneous

Chassis: 4x2 2WD
Drive Type: 2WD
Steering Type: Manual
Coolant Capacity (qts): 8
Front Tire Diameter (in): 15
Front Tire Width (in): 5
Rear Tire Diameter (in): 24
Rear Tire Width (in): 7
Front/Rear Rim Diameter (in): -
Tire Type: Agricultural
Manufacture - End Year: 1957
Hitch Type: Allis Snap Coupler
Hitch Category: -
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: Open operator station or canvas cab (optional)
Starter Type: Electric
Brake Type: Differential mechanical contracting band
Hydraulic System Type: -

Test Results

Nebraska Tractor Test Laboratory - Test Date: May 31 to June 8, 1938

Maximum Power and Fuel Consumption

Maximum Belt Horsepower: 15.68 HP
Fuel Consumption at Maximum Load: 0.77 Gal/hr with a consumption rate of 5.34 lb/hr

Drawbar Performance

Maximum Drawbar Horsepower: 12.97 HP
Fuel Consumption at Maximum Load: 0.74 Gal/hr

Torque and Engine Performance

Crankshaft Speed at Maximum Load (Belt Test): 1460 RPM

Hydraulic Performance

This test does not include specific hydraulic performance metrics for the Allis-Chalmers B tractor.

Overall Efficiency

Drawbar Horsepower Efficiency: 13.54 HP (sea level calculated)

Nebraska Tractor Test Lab. (1938). Test 302: Allis-Chalmers Model B. Lincoln, NE: Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/899