The Allis-Chalmers 7040 followed the 7030 in 1975 as a larger 7000 Series diesel tractor. It used a 7.0-liter six-cylinder engine, a 20-speed or 12-speed partial power-shift transmission, and independent PTO.
The 7040 was built through 1977 and was followed by the 7045. Its standard Acousta cab, power steering, and wet-disc brakes show how the 7000 Series moved toward larger and more comfortable field tractors.
Serial number locations: The tractor serial number is stamped above the PTO shield.
The table below shows the beginning tractor serial number for each Model 7040 year:
| Model 7040 year | Beginning serial number |
|---|---|
| 1975 | 1,303 |
| Model 7040 year | Beginning serial number |
|---|---|
| 1976 | 4,089 |
| Model 7040 year | Beginning serial number |
|---|---|
| 1977 | 6,839 |
Total production: Unknown.
