Allis Chalmers CA

Last Updated: July 2024

Overview

The Allis Chalmers CA is a two-wheel drive row-crop tractor that was produced by Allis Chalmers from 1950 to 1958. This model features a 4x2 2WD chassis, manual steering, and a non-synchronized gear transmission with a dry disc clutch, which includes 4 forward gears and 1 reverse gear. It uses a liquid-cooled, four-cylinder gasoline engine from Allis Chalmers with a displacement of 125.2 cubic inches and an output of 23.1 horsepower at 1650 RPM. The CA model is equipped with an open operator station, differential mechanical contracting band brakes, and the Allis Snap Coupler hitch system. It was designed to operate with a weight of 2835 pounds and carries up to 9 quarts of coolant.
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Key Specifications

Category: Row Crop

Power Output: 23.1

Transmission: Non-synchronized gear

Drive Type: 2WD

Operating Weight: 2835

Fuel Type: Gasoline

Allis Chalmers CA vs. Similar Tractors

Power Output
Poor
Greater than 1% of similar tractors.
Operating Weight
Below Average
Greater than 16% of similar tractors.

Technical Specifications

Engine

Manufacturer
Allis Chalmers
Model
Allis Chalmers
Cooling Type
Liquid-cooled
Cylinder Orientation
Vertical
Valve Configuration
I-head
Fuel Type
Gasoline
Induction Type
Naturally aspirated
Cylinders
4
Displacement (ci)
125.2
Bore (in)
3.39
Stroke (in)
3.5
Rated RPM
1650
Power Output (hp)
23.1

Transmission

Type
Non-synchronized gear
Forward Gears
4
Reverse Gears
1
Total Gears
-

Dimensions

Length (in)
124.8
Width (in)
-
Height (in)
72.8
Operating Weight (lb)
2835

Power Take-Off (PTO)

PTO Type
Live
PTO Speed 1 (rpm)
538
PTO Speed 2 (rpm)
-
PTO Speed 3 (rpm)
-

Miscellaneous

Chassis
4x2 2WD
Drive Type
2WD
Steering Type
Manual
Coolant Capacity (qts)
9
Front Tire Diameter (in)
15
Front Tire Width (in)
5
Rear Tire Diameter (in)
-
Rear Tire Width (in)
-
Front/Rear Rim Diameter (in)
-
Tire Type
Agricultural
Manufacture - End Year
1958
Hitch Type
Allis Snap Coupler
Hitch Category
-
Hitch Position
-
Hitch Capacity (lb)
-
Operator Station Type
Open
Starter Type
Electric
Brake Type
Differential mechanical contracting band
Hydraulic System Type
-

Test Results

Nebraska Tractor Test Laboratory - Test Date: October 31, 1950

Maximum Power and Fuel Consumption

  • Maximum Power: 23.55 HP (17.56 kW)
  • Fuel Consumption at Maximum Power: 2.36 Gal/hr (8.93 l/h) with a fuel efficiency of 0.657 lb/hp.hr (0.399 kg/kW.h)

Drawbar Performance

  • Power at Rated Engine Speed: 18.63 HP (13.89 kW) with a drawbar pull of 2040 lbs (9.08 kN) and a speed of 2.59 mph (4.17 km/h)
  • Fuel Consumption at Rated Speed: 0.654 lb/hp.hr (0.398 kg/kW.h)

Belt Power

  • Belt Power at Rated Speed: 21.60 HP (16.11 kW)
  • Fuel Efficiency at Belt Power: 0.626 lb/hp.hr (0.381 kg/kW.h)

Hydraulic Performance

  • Hydraulic System: Not applicable to this model

Overall Efficiency

  • Fuel Efficiency at Standard PTO Speed: 0.616 lb/hp.hr (0.375 kg/kW.h)
  • Fuel Consumption: 2.24 Gal/hr (8.48 l/h) at 1497 rpm



Nebraska Tractor Test Lab. (1950). Test 453: Allis-Chalmers CA. Lincoln, NE: University of Nebraska-Lincoln. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/150

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