How do you calculate the length of a pto shaft?

To calculate the length of a PTO (Power Take-Off) shaft, measure the distance between the tractor's PTO output and the implement's input while ensuring both are properly aligned. Subtract the length of the yokes (or universal joints) from this measurement, as they need to fit onto each end without extending beyond the shaft. It's essential to account for the necessary overlap of the yokes for proper operation, typically ranging from 2 to 6 inches, depending on the application. Finally, adjust the length accordingly to ensure the shaft maintains proper engagement during operation.