The pto keeps disengaging but comes right back on when reset

disengage pto start up move to alredy mowed area shut off and clean grass from under deck restart it turn on pto cut grass

bad pto need to replace it

I have a Cub Cadet 1605 and it does the same exact thing. Try the PTO switch on the dash. I replaced mine and it works fine. Hope this helps.

I don't think it's wiring. If it were, the PTO clutch should disengage.
In your case, it's not. To me, it sounds more like a mechanical load on the blades or possibly bearing gone in one of the blade pulley assemblies.

loosen nuts 1/4 turn on electric pto

Sounds like you have a short circuit, either in the PTO clutch, or in the wiring that goes to it. Inspect the wiring for any obvious spots where insulation has rubbed off or burned. Also look at the wiring at the back of the PTO engagement switch for these signs. Before buying an expensive PTO clutch, unplug its connector. Drive around with the PTO switch on (even though the PTO won't activate and the blades won't be engaged). If the fuse doesn't blow, the problem must be within the PTO clutch. If the fuse still blows, it must be in the PTO switch or the wiring from there to the clutch. Use an ohmmeter to trace and find the short. Good luck!

check for bent parts try some wd40

I found that the safety switch under my seat was the problem for me. If I had to lean when going near hedges or low hanging branches, my PTO would disengage. I removed the safety on the seat and no problems since.

If its an electric PTO then the switch on the dash is bad, Its a lever type ungagement then the little break shoes that rub on the blade spindles are either worn out or mis adjusted.If it started when you changed the blade drive belt its possibly the wrong belt??

Mine does the same thing. I've found that normally this is a heat-related problem and by removing all the clippings from the deck the blades will re-engage just fine until (unless) the clippings mount up again. Hope this helps; I make sure the deck is clean top and bottom before I mow.