105 Drivetrain issue - stopped moving

[MiniXP]

I finished fixing some motor problems today, that involved a carb rebuild. I was driving around a bit making sure the carb was adjusted well and did some fast starts (too fast apparently) - One start if seems like something broke/popped and now it won't move much.

Forward or reverse, I either get no movement, or occasionally very little. Any ideas on what the issue might be?

In the past 8 or so years I have replaced the sheer pins on both ends of the driveshaft and rag joint and changed the hydro fluid and filter.

I'm guessing I need to split the tractor and see what broke, but not sure if I should open up the hydro unit again? It did have a slight leak I think, could it just be low fluid?

I took a look underneath and the rear end seems to be shifting some, not sure what that may indicate: https://youtu.be/bNIPOwN0C0k

[green407]

I would start with tightening your transaxle mounting hardware, and then look at your spiral pins at the front and rear of the drive shaft.

[Billy-O]

I would also add that you verify your relief valves are not pressed in!

[green407]

Originally Posted by Billy-O

I would also add that you verify your relief valves are not pressed in!

I forgot about this, with the transaxle rocking like that I could easily see them striking the underside of the tunnel cover/extension cover

[MiniXP]

Originally Posted by green407

I forgot about this, with the transaxle rocking like that I could easily see them striking the underside of the tunnel cover/extension cover

Ooo that would be interesting, but kind of lines up to how I can get it moving slowly sometimes.

Needed to clean up my shed to make some room to work on it, so have not yet taken a look.

[MiniXP]

Took some more of it apart and cleaned up some dirt to try to figure out what is going on.

• Driveshaft appears fine and connected through the rag joint, all spinning
• Forward/reverse lever appears to still be connected fine
• Topped up the hyrdo fluid - I did not see any obvious carniage inside the unit, but only was peaking through the fill hole.

I took two more videos if anyone could take a look to help me figure out next steps. I'm not sure if I should split the tractor to get a better look at the driveshaft etc next or take the cover off the hyrdo unit to look inside.

View with the seat cover and fenders off: https://www.youtube.com/shorts/ob-udd-a-1Y

View from underneath: https://www.youtube.com/shorts/eMyr0T2xFuM

Edit: looking at the video again. The shaft coming out the back of the hydro unit it not spinning for the most part. Does that just point to a broken roll pin? I see everything spinning going into the unit from what I can tell, but maybe it just sheered off in the middle of the shaft so it looks fine from the outside?

[Grandpa53]

Broken roll pin at front of hydro. The shaft at back of hydro is a thru shaft and turns whenever motor is running.

[MiniXP]

Originally Posted by Grandpa53

Broken roll pin at front of hydro. The shaft at back of hydro is a thru shaft and turns whenever motor is running.

Well that’s good I didn’t ruin the hydro unit. If I recall, the easiest way to replace that is to split the tractor correct?

[MiniXP]

Got it all back together today after splitting it to replace the sheer pin. Also got it cleaned up a bit while apart.

Running great now after the carb rebuild that did before the sheer pin broke.

[finsruskw]

Did you replace the pins with Spirol pins and NOT split pins??