Chipper PTO Shaft spinns

[Soundguy]

Look at a brush hogs with round input shafts, and the pto shaft is coupled with a shear bolt, and the shaft is retained with a E or split ring.

Shear pin pops, pto shaft still spins.

If you put the shear protection at the tractor end, when it pops, the pto shaft will not spin. You see this 'tractor end' protection sometimes with devices that have a torque limiting device that is part of the pto yoke. ( many are slip cllutches ). I guess the downside is weight on the stub end of the pto shaft... of course the weight is going to be somewhere.. mower input shaft or pto stub shaft. guess the mower input shaft is easier to reseal.

 

[Tractor Seabee]

Some shafts have a bolt with self locking nut left with play. Do you have the manual? Should say what grade. My Land Pride implements use a grade 2 bolt. Past posts have discussed the grade, some seems like use grade 5 and some mild steel. You may need to experiment if no manual.

Ron