QL: PTO belt slips when STOPPING PTO
 

I have a 1450 I'm getting back online. It worked fine, but had a bad PTO shaft oil seal leak. I pulled the PTO to replace the seal. When I replaced the PTO I was sure to set the "air gap" with the proper width feeler gauge.

I just got everything back together and fired her up. Things were running fine (after engaging the PTO with deck mounted) until I turned the PTO switch OFF, there was sort of a "bang" and the belt popped off as the PTO stopped turning. (belt came off PTO pulley) The bang I describe may not have been noticeable normally - but I still have the hood/cowling/nose-piece removed. The belt is the same one used before and nothing else has changed. (same mule drive also) I have checked the PTO since the belt popped off and it still works. I haven't given it another it another try as I don't want to chance messing up the PTO or the belt.

Any ideas?

Thanks!

-Calvin

Well, that could be a number of things. What comes to my mind is two fold. I would look at the (A) Brake mechanism for proper adjustment, or (B) the PTO Bearing to see if it is bad.

Are you turning the clutch off at or near idle? If not, you should be. It is hard on the clutch and belt if you don't.

Well, issue resolved - but, due to time constraints, I can't say what did it. I did the following:

- put a 2nd shim in as the gap between driven and driving hubs/disks was .050 with the manual stating it should be .060-.090. Only one shim came out when I disassembled but who knows...

- flipped belt over. Since it had already been in use, someone suggested it might have a memory.

- reinstalled the outer plate and did not torque the nuts down as much. I had gapped it the first time around and thought I had it right - but figured I'd give it a shot. I'll now work them down incrementally until back into spec or have an issue. This isn't hard as it might be as I haven't reinstalled the nose piece and hood yet.

Matt, thanks for the advice on when to/not turn PTO on and off. I didn't know.

Calvin

Don't feel bad, I had NO idea about undo stress on the PTO's engaging at WOT either, till I started reading and getting advice here too. No telling how many PTO's I engaged wrong up till this point. :beerchug:

guilty of engaging and shutting off PTO at WOT myself. Just one of those things you don't know any better about until someone tells you. Just another reason to love this forum! :beer2:

I knew about engaging the PTO at a lower motor speed, but never heard of lowering the motor speed when disengaging the PTO. I don't know or can think of the reason around that part.

Is there a brake on the pto?

The electric clutches have a brake that'll wear if it's trying to bring the deck to a dead stop from 3600 rpm.