PTO Stub Shaft Squeal- Machinists??

[WheelHorseVH 107]

Hey all. I pulled my PTO assembly off because it was squealing like crazy. It would do it mostly when there was no attachment and no belt running to it, like when plowing. I went ahead and pressed out both bearings along with the dust seal. As it turns out the outer ball bearing had failed. I cleaned out the inside of the PTO bell and installed new bearings, high quality grease to the needle bearing, and new dust seal.
 

I’ve come across multiple posts that discussed the PTO squeal, but none seem to have arrived at the same conclusion that I have with mine. So I thought I would post what I have found and also ask for some help.
 

As I was reassembling the stub shaft, I noticed that the stub shaft could move inside of the inner race of the outer ball bearing. It occurred to me that this should likely be an interference fit, and was no longer because my outer bearing had failed and gotten very heated up. In fact, some of the paint on my PTO bell had actually bubbled off because the PTO bell had gotten so heated at times. If it is NOT supposed to be an interference fit, I don’t understand the design because then it means that the inner race of the bearing and the stub shaft become a friction point, especially when not under load. To me, the inner race and stub shaft should always tightly stay together so you don’t wind up with squeal when they are moving at different rates (i.e. the inner race is moving at all in relation to the stub shaft passing through it).
 

So what I am looking for is if someone out there who is perhaps a machinist that could turn a new stub shaft for me. It appears to be an exceedingly simple part to make for someone who knows what they’re doing. I could order a new bearing and send it to you so you have the exact tolerance. 

 

Please PM me, thanks. 

[ri702bill 8,814]

Are you referring to item #40, the Inner Race??

If so, it is secured to the #43 clutch disc by two #42 Retainers. Once properly assembled, the race should not move seperately.

The retainers have an undercut on the backside that fits the groove in the race - they may be worn and that's the problem...

 

That inner race is HARD and ground to a polished surface finish - not something you just whip up out of cold rolled steel....

Is the crankshaft chewed up?? If so, that needs to be addressed.

 

 

Edited 22 hours ago by ri702bill

[gwest_ca-(File Mod) 11,194]

If you need item #33 it should still be available from your local Toro dealer. The one you need may have 2 retaining rings - one each side of the bearing.

Post your model and serial number so we can get you the part number.

[lynnmor 7,514]

Part #33 is a slip fit and doesn’t cause a squeal, perhaps the brake is causing the noise.

[squonk 42,038]

I think he is saying #33 is worn down and fits loosely into the inner race of the outer bearing because the previous outer bearing failed. If that's the case #33 stub shaft can indeed cause a squeal as the outer bearing spins and both races spin together. The loose fit of the stub shaft would not stop the inner race from turning. I'm thinking a new stub shaft will fix this. @S416-8 has some spare PTO Bells in his parts lot he might be able to sell you. Good to have a spare kicking around anyway. 

[ri702bill 8,814]

Agreed - if that part is the noisy one....

[peter lena 9,021]

@WheelHorseVH  one of the frequent  GOLD MINE , areas for issues and elimination  of them . lot of related LUBRICATION FAILURE , in all related rotational points . every  related bearing  has , lucas  xtra hd  green chassis grease , durability specs , say it all , also related mule drive bearings , as well as driven attachment bearings , pto lever engagement , can / should be smooth , easy , quiet , also great opportunity  to detail in the lever starting point  , next to battery tray , loose, sloppy set up only adds to the  issue . my 3 horses have this change over , the functional detailing  , make it work , without effort ,  of course this is not in the book . just my experience /  to a used to be problem , pete

 

[WheelHorseVH 107]

@squonk you hit the nail on the head in terms of what I was describing. 
 

@lynnmor when you say slip fit is that the same as essentially a press fit? If so, mine is definitely worn because the only part of that stub shaft that has a nice pressed in fit with the bearing is the virgin portion that pokes out with the hole where the hoop attaches. The portion of the stub shaft that is usually inside the bearing is worn down smaller. 
 

@gwest_ca thank you for that I just went ahead and ordered it from Toro.
 

I was originally hoping someone here might be up to making a template for one since Toro was $25 and I figure it really is a very simple part to make for someone with the talent. Plus, if this happened to my garaged and fairly pampered 520H, imagine how many others might have a squealing PTO thanks to that little thing! 
 

Appreciate it as always guys. I will post back after I receive and install the new one.