PTO question

[mrc 963]

hello men,

 

  i'm use to the pto setup on the 3, 4 and 500 series wh tractors.

 

recently i took the pto bell off an older 'C' series and it had a thin small washer and spring in there.   i'm hoping one of you can anyone provide an exploded view of how this is supposed to go back together.

 

thank you in advance

 

regards

mike

 

 

[Bar Nuthin 1,172]

From my C-120

 

The picture is kind of confusing, but there is a thrust bearing that the spring rides on - the spring is meant to apply pressure to push the outer PTO shaft (14-75) and push the plates apart when disengaged.

 

  

 

Here's what I found the first time I took my PTO off.

 

Edited yesterday at 01:17 AM by Bar Nuthin

[gwest_ca-(File Mod) 11,593]

You can eliminate all those inner pieces if you replace the 14-75 that has one retaining ring groove to a later version that has two retainers - one on each side of the bearing.

A  parts list showing the assembly

https://www.partstree.com/models/r1-12k801-312-8-toro-garden-tractor-1990/pto-clutch-and-control-38/

[Gasaholic 316]

9 hours ago, gwest_ca said:

You can eliminate all those inner pieces if you replace the 14-75 that has one retaining ring groove to a later version that has two retainers - one on each side of the bearing.

A  parts list showing the assembly

https://www.partstree.com/models/r1-12k801-312-8-toro-garden-tractor-1990/pto-clutch-and-control-38/

 

Actually, if you note in the parts list 14-75 is the same 102872 pto shaft - Those inner pieces (7/16 stud, thrust race, thrust bearing, spring) are meant as a "return spring" for PTO to ensure positive disengagement of the PTO bell (pressing it against the PTO brake - listed as 14-105 , AKA 104730)  That was added back when CPSC stepped in with some safety requirements (along with things like seat switches, safety switches, etc) , and then later on wheel horse eliminated that with a PTO return spring that hooked between the upper end of the loop (102938 / 14-76) and the engagement eccentric plate (102943 /14-83) that accomplished the same thing with more simplicity. - typically what then happened with that inner spring setup was the thrust bearing failed and the spring friction welded itself to the PTO shaft and wore away at the end of the stub until the snap ring fell off - it was a fairly common issue we had at our shop to find them that way... They can be left out, but then the PTO brake became largely ineffective and pointless. 

[clueless 3,292]

12 hours ago, gwest_ca said:

You can eliminate all those inner pieces if you replace the 14-75 that has one retaining ring groove to a later version that has two retainers - one on each side of the bearing.

A  parts list showing the assembly

https://www.partstree.com/models/r1-12k801-312-8-toro-garden-tractor-1990/pto-clutch-and-control-38/