- Measure PTO shaft length, including pilot depth to
engine block (Dimension A)
- Measure pump shaft length including pilot depth to pump flange
mounting face (Dimension B)
- Select drive coupling on basis
of torque capacity, and find spider thickness (Dimension C)
- Add clearance desired, from .0625 to .500, if necessary (Dimension
D). If shaft and coupling stack up does not allow for a clearance,
consideration should be made to shorten engine shaft. If this
is not possible, consult our engineering staff. We have thousands
of other coupling designs in stock!
- Add dimensions A=B=C=D to yield overall casting length as
shown:

6.) Now, select Guardian item # as follows:
