712 PTO Clutch Lock Nut - UPDATE

[IronPony 3]

Well, I thought a fine thread nut would work on the PTO shaft to hold the clutch on. I seem to be wrong?? The nut just wants to cross thread. The threads on the shaft look OK and the nut looks OK. Anyone want to sell a used nut off??? I will pay for both shipping and the lock nut. The tractor is an AC712 about a 1978. Thanks, Gentlemen, for any help. Dan Got the new Jam lock nut (guess the jam lock nut has a different fine thread than a regular lock nut???)and torque it down. All is well!!:D It is running the mower deck without any slippage^. When I tightened it down, I used a pipe wrench to hold the shaft on opposit side of the BGB and it was easy to torque it on. Thanks for all the replys!! Dan

[HubbardRA 19]

I have heard that these nuts should be replaced with a new nut any time they are removed. I have had trouble with the one on my 716H coming loose, since I changed the cone clutch. I was planning to buy a couple new ones from Simplicity.

[IronPony 3]

Rod, It has been my experience that you are right. Once a lock nut is loosened (sp) up it will never be as good as new again. Sooo, I ordered one form Sandy Lake Imp. Only a couple of dollars and they are just great about getting it out in the mail to me. Can't say enough good about Betty and Sandy Lake Imp. Dan PS: Rod, you say you put on a new cone clutch? How much do they cost? I am worried that while mine was loose I may have burnt it out. Think I will take it off and inspect it.

[2burning 1]

My new cone clutch was right around $60. I am pretty sure the threads are a standard size of fine thread - 1/2 inch if I am remembering corectly?

[HubbardRA 19]

Dan, I pulled mine apart because the internal bearing had gone bad. I took the whole assembly from another used tractor. Later I put a new bearing in the original unit and put that hardware back on the other tractor. I have never bought a new cone clutch, but am thinking about making a leather clutch lining for the worst of the two clutches.

[RayS 79]

I bought a new cross shaft when I rebuilt my bevel gear box back in feburary. The cross shaft came with a new nut as well. either the dealer or the large frame repair manual says not to reuse the old nut. The threads on the hydro are 3/4-16 but different on a 7016 6 speed I have around here for parts.