About the Allis-Chalmers CA
The Model CA followed the Model C in 1950 and gave small farms a little more speed and flexibility. It kept the compact row-crop layout and four-cylinder engine, but added a four-speed transmission and a live PTO operated by a hand clutch. That hand clutch lets the PTO keep turning while the tractor is stopped, which is useful with a mower or other PTO-driven equipment.
Built at West Allis from 1950 through 1958, the CA remained a practical tractor for cultivation, mowing, and general farm work. The model is a useful step between the older C and the newer D Series.
Serial Number Reference
Serial number locations: The tractor serial number is stamped on top of the transmission case, next to the shift lever. The engine serial number is on the rear left-hand side of the engine.
The table below shows the beginning tractor serial number for each Model CA year:
1950-1952
| Model CA year |
Beginning serial number |
| 1950 |
14 |
| 1951 |
322 |
| 1952 |
10,539 |
1953-1955
| Model CA year |
Beginning serial number |
| 1953 |
22,181 |
| 1954 |
31,424 |
| 1955 |
32,907 |
1956-1958
| Model CA year |
Beginning serial number |
| 1956 |
37,203 |
| 1957 |
38,618 |
| 1958 |
38,977 |
1950-1954
| Model CA year |
Beginning serial number |
| 1950 |
14 |
| 1951 |
322 |
| 1952 |
10,539 |
| 1953 |
22,181 |
| 1954 |
31,424 |
1955-1958
| Model CA year |
Beginning serial number |
| 1955 |
32,907 |
| 1956 |
37,203 |
| 1957 |
38,618 |
| 1958 |
38,977 |
1950-1958
| Model CA year |
Beginning serial number |
| 1950 |
14 |
| 1951 |
322 |
| 1952 |
10,539 |
| 1953 |
22,181 |
| 1954 |
31,424 |
| 1955 |
32,907 |
| 1956 |
37,203 |
| 1957 |
38,618 |
| 1958 |
38,977 |
Total production: 39,499 Model CA tractors.
The final CA serial number was 39,513.
