B2150 Shaft Coupler isn’t grabbing shaft

[TNENGNR]

I was concerned my clutch had failed but I removed the inspection cover and had a look at the shaft that connects the transmission to the HST. When I let off the clutch pedal this shaft spins but it cannot turn the HST shaft because the coupler is stripped out on it.

it looks like it could have gone back another 3/4 inch or so, so did it slip off somehow? Assuming I can’t save the splines on the HST shaft, is this something I can purchase and take apart the HST to replace or is it toast? How bad of an idea would it be just to weld the coupler to the shaft?

Does the case have to be split to get this coupler and intermediate shaft out or is is serviceable from the bottom?

The power steering and lift is working but the tractor won’t drive.

 

[Mountainman]

You can tell in the picture the splines are stripped off. There also should be a roll pin pinning the coupler to the shaft. Its possible it has moved from where it should be but at this point i don't know that there would be enough good splines to move it back where it should be and be ok and/or if the splines on the coupler are stripped also. Unfortunately have to split the tractor to replace

 

[TNENGNR]

Thanks for the reply. I bounced around the internet trying to find where this has happened to others and it looks like it happens but it isn’t very common, lucky me.

Another gentleman used the spring pin holes to insert a grade 8 bolt and he said they kept snapping almost immediately, so that’s not even a temporary repair. There is a rubber oil seal an inch away from where I would be welding so that’s out.

Best I can tell the shaft is heat treated solid steel but the coupler is just cast, so it’s soft. I guess they did this so the coupler would fail before whatever caused it to fail also ruined the HST.

At any rate it looks like to repair it properly I’m taking the whole thing apart as you said. I found a YouTube video of a clutch replacement and I’m hoping that will get me most of the way there. Sounds like a good project for the Fall when it cools off!