PTO Issue

[lynnmor 7,307]

Now it's the PTO with a weird problem.  I just noticed that the outer end of the PTO was cut down to the snap ring.  With no groove left, it can possibly pop out at any time.  The only thing that I see can cause the problem is the spring retainer on the pin acting like a lathe tool and it cuts away the cast iron till the hard snap ring ends the cutting.  So when checking all three 520H's, the 1996 and 1997 were both cut down the same.  The 1991 was fine with no sign of any contact.

 

So now I need 2 good parts and whatever seals, bearings, snap rings and pins that are required to make it right.

 

Below are photos of the 3 PTO's.

 

 

[ol550 830]

Would get a couple new bearings and a little red Loctite and not look back.

[woodchuckfarmer 333]

I second that idea .         Wayne

 

 

 

 

 

[Ed Kennell 38,203]

Third that...then put the spring retainer inside the PTO hoop so it doesn't rub.

[Pollack Pete 2,273]

I had the exact thing happen.Or at least a previous owner of one of my Horses had it happen.Luckily,I just walked over to my bone yard and got a new one off another horse.Amazing what metal against metal can do.That pin is made out of pretty good stuff.

[MalMac 1,331]

Sometimes this is the result of the PTO engagement rod being adjusted too tight. If that snap ring on the outside of PTO is the least be worn or the grove for the ring is worn, the shaft will be moved inward when the ring comes out of the groove thus causing the loop to be drawn inward against the PTO bell. 

 

[lynnmor 7,307]

55 minutes ago, MalMac said:

Sometimes this is the result of the PTO engagement rod being adjusted too tight. If that snap ring on the outside of PTO is the least be worn or the grove for the ring is worn, the shaft will be moved inward when the ring comes out of the groove thus causing the loop to be drawn inward against the PTO bell. 

 

Thanks for the feedback, I am hoping to learn if this is a widespread problem and find a cure.  My snap rings were still in the grooves but the outer one was a bit distorted,  The end of the spring on the pin has wear on it and is worn to a shape like a drill point, that is the only contact that I can find.  I do run a lot of clutch pressure when using a two stage blower or 60" deck, but the 1991 runs both and there is no issue at all on that one.

The 103478-03 clutch is in its third revision which makes a total of four different parts, does anybody know what has been changed?  Again, my old one with no revision has no problem.

Putting the spring inside the hoop, as suggested above, should stop the cutting but the spring could rub against the hub.