Tractor PTO Shafts
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| PTO Type: | Type 1 | Type 2 | Type 3 |
| Diameter: | 1 3/8" (35mm) | 1 3/8" (35mm) | 1 3/4" (45mm) |
| Speed: | 540 RPM | 1000 RPM | 1000 RPM |
| Gear teeth: | 6 | 21 | 20 |
| Rotation: | Clockwise, as viewed from end of shaft | ||
Not all tractors will have a power take-off that conforms to the standards. In addition, there are older and less-common PTO standards. Before using any PTO refer to the tractor's operating manual to ensure you have properly matched the PTO and implements.
Farmall Cub
The Farmall Cub uses a 15/16th inch 10-spline PTO that rotates counter-clockwise at 1800 RPMs. The Cub can only use powered implements specifically designed for the Cub PTO, or the shaft must be modified.
1-1/8 PTO
A 1 1/8" six-spline 540 RPM PTO shaft was used on some US farm tractors from the 1930s until the 1950s. On some machines the shaft size was an option as the standard changed from 1-1/8 to 1-3/8. The popular Ford N-series tractors were equipped with the 1-1/8 inch PTO shaft. Because it has the same rotation speed and direction, this shaft size can usually be converted to 1-3/8 with a slip-on adapter.
2000 RPM Garden Tractor PTO
A one-inch, 2000 RPM, 15-spline garden tractor PTO was a US standard for rear PTOs on lawn and garden tractors first established in 1974. The 2000 RPM garden tractor PTO was intended for use on tractors with the Category 0 three-point hitch. The emergence of the sub-compact utility tractor, with 1-3/8 PTO shafts, had led to a disuse of the 2000 RPM standard.