Allis Chalmers CA

The Allis Chalmers CA is a tractor produced by Allis Chalmers. It is equipped with a 125.2 ci 2.1 L engine. The rated power output is 25.96 hp 19.4 kW. Transmission: 4 forward and 1 reverse. Operating weight: 2835 lbs 1285 kg.

Overview

	1950 - 1958 Row-Crop tractor
1950 - 1958
Row-Crop tractor

Production
Manufacturer	Allis Chalmers
Row-Crop tractor
Built in West Allis, Wisconsin, USA
Total built	39,499
Original price was $1,900 in 1958
The live PTO on the CA was due to a hand clutch that "broke" the rear axle, causing the differential to spin freely.

Allis Chalmers CA Engine
Allis Chalmers 2.1L 4-cyl gasoline
Engine details ...

Allis Chalmers CA Transmission
4-speed non-synchronized
Transmission details ...

Allis Chalmers CA Power
Drawbar (claimed)	18 hp 13.4 kW
PTO (claimed)	23 hp 17.2 kW
Drawbar (tested)	22.97 hp 17.1 kW
Belt (tested)	25.96 hp 19.4 kW
Performance test details ...

Mechanical
Two-wheel drive
Manual steering
Differential mechanical contracting band brakes
Open operator station

Capacity
Fuel	13 gal 49.2 L
Hydraulic system	2 gal 7.6 L

Hydraulics
Capacity	2 gal 7.6 L
Pressure	3200 psi 220.6 bar

Tractor hitch
Type	Allis Snap Coupler *Available after 1954.

Power Take-off (PTO)
Rear PTO	live
Rear PTO Type	538

Dimensions & Tires
Wheelbase	82 inches 208 cm
Weight	2835 lbs 1285 kg
Front tire	5.00-15
Rear tire	10-24
Full dimensions and tires ...

Belt Pulley
Diameter	8 inches 20 cm
Width	5.5 inches 13 cm
RPM	1220
Speed	2555 ft/min 778.76 meters/min

Electrical
Ground	positive
Charging system	generator
Charging amps	10
Battery volts	6
Battery AH	95

References
Farm Equipment Service Manual (SM-3)
Farm Power Facts published in 1954, by Allis Chalmers

Engine

Engine Detail — 125.2 ci / 2.1 L Gasoline

Manufacturer	Allis Chalmers
Fuel Type	Gasoline
Configuration	4-cylinder 8-valve, liquid-cooled vertical I-head
Displacement	125.2 ci 2.1 L
Bore/Stroke	3.375x3.50 inches 86 x 89 mm
Air cleaner	oil bath
Compression	6.25:1
Rated RPM	1650
Firing order	1-2-4-3
Starter volts	6
Coolant capacity	9 qts 8.5 L
Sparkplug	AC45
	Autolite A-7
	Autolite A-9
	Champion J-8
Sparkplug gap	0.030 inches 0.762 mm
Point gap	0.020 inches 0.508 mm
Intake valve clearance	0.012 inches (hot) 0.305 mm
Exhaust valve clearance	0.012 inches (hot) 0.305 mm

Transmission

Transmission — 4 forward and 1 reverse non-synchronized

Type	non-synchronized
Gears	4 forward and 1 reverse
Clutch	dry disc
Oil capacity	4 qts 3.8 L

Dimensions

Allis Chalmers CA Tires
Ag front	5.00-15
Ag rear	10-24

Dimensions
Wheelbase	82 inches 208 cm
Length	125 inches 317 cm
Height	73 inches 185 cm
Operating weight	2835 lbs 1285 kg
Ballasted weight	5045 lbs 2288 kg
Front tread	6.25/13 inches 15/33 cm
Rear tread	52 to 80 inches 132 to 203 cm

Tests

Nebraska Tractor Test 453
Gasoline 4-speed 2WD November 31 - 9, 1950 Link: Nebraska Tractor Test 453 file
Belt power (max)	25.96 hp 19.4 kW
Belt fuel use (max)	2.4 gal/hour 9.1 l/hour
Drawbar performance
Max power	22.97 hp 17.1 kW
Gear 2 used for power test.
Max pull	3,557 lbs 1613 kg
Gear 1 used for pull test.

Photos

Allis-Chalmers CA with tricycle front end, left side.

Wide-front Allis-Chalmers CA with planter.

Wide-front Allis-Chalmers CA with planter.

Allis-Chalmers CA with two-bottom Allis plow.