Drive-shaft pin

[dagenham]

I have been having a problem with breaking the pin in the driveshaft at the engine coupler. I can see that the hole has become oblonged and I suspect that is why I keep breaking the pin.
This is a 127 hydrostatic by the way.
If I replace the driveshaft and coupler, is this going to solve my problems or is this a common problem with hydros???

[TheSaturnV]

You can weld up the worn spots in the coupler and grind it back to the proper shape. I did this in one of my Cub 147 restoration youtube videos.

[Cub Cadet 123]

Originally Posted by dagenham

I have been having a problem with breaking the pin in the driveshaft at the engine coupler. I can see that the hole has become oblonged and I suspect that is why I keep breaking the pin.
This is a 127 hydrostatic by the way.
If I replace the driveshaft and coupler, is this going to solve my problems or is this a common problem with hydros???

You will keep shearing pins until that coupler is back to its original form. Same problem occurred on my 129 until I replaced the coupler. You will need to fix that coupler or replace it to get back in action.

Cub Cadet 123

[Yosemite Sam]

As SaturnV stated, yes you can weld and reshape the coupler, I do it all the time. I didn't know that a worn coupler would break the pins.

What kind of pin are you using in the shaft?

[Alvy]

Originally Posted by Yosemite Sam

As SaturnV stated, yes you can weld and reshape the coupler, I do it all the time. I didn't know that a worn coupler would break the pins.

What kind of pin are you using in the shaft?

Agreed. The pin at that specific location should be a solid pin, not a roll or spiral. Still need to fix or replace as stated above but they can get super worn out and normally not break?

[DoubleO7]

My experience has been you can run both until the pin breaks.
The pin will likely be worn down half thru or so before breaking.
Then if you install a new pin with the worn coupling, the new pin with snap really soon after.
Why is that?

[jchristensen]

After losing or breaking the pin on my 125 a couple of times I did away with my coupler and pin and did a rag-joint conversion. I found a thread on here somewhere that showed how to do it.
I had a 1250 parts machine and used the drive shaft coupling and rag-joint off of it to add to the front of my shaft. I had to shorten the drive shaft and drill a hole for the pin. I don't remember all the specifics, but it wasn't too hard.