When I bought this tractor and loaded her up on the trailer I noticed it was possible to roll it with the pin engaged, occasionally it would lock but by rocking it back and forth I could always get it going again with a "clunk" coming from the gearbox. The strange thing is that the tractor runs well with no noticeable issues. I thought it best to have a closer look inside the gearbox.
I took the cover off and although the inside of the gearbox with dirty the gears are in great shape.
There was this black tar like sludge covering everything so I decided to clean it out using the same method I used a few weeks back to clean the gearbox on the 850: diesel fuel in a garden pump sprayer, I got it looking pretty good except for a thicker layer of that black sludge stuck on the bottom, I left it soaking overnight.
Here are pictures of before and after
Next I disassembled the right side of the axle to fix a wheel wobble, I had previously purchased the bronze bushings to replace them. I struggled somewhat to remove the wheel hub from drive collar and also noticed more that usual play along the keyway when rocking the wheel back and forth. Once it was out I noticed the bronze bushings were actually in not too bad of a shape but upon closer inspection I noticed the drive collar was cracked along the keyway, this explains the play I was having.
I was disappointed, this drive collar seemed in good shape with the locking tab intact. Luckily I had a couple spares including one NOS.
I intended to install my good used one which I had bought on eBay a while back, noticed it was also cracked along the keyway! There is definitely a weakness in this design.
Ended up using my NOS one which fits well on the old bronze bushings so I won't need to change them after all.
Tomorrow I'll put everything back together and adjust the axle end play, hopefully that's all that is needed to fix the rolling problem.
Edited by chubien, January 08, 2016 - 10:36 PM.