charlz
Elite Member
I thought I would share some pictures of the 3pt o-ring change out I did. Here is the background/detail:
I bought this 1970's or so Kubota B7100 along with some attachments. I found that with heavy implements the 3 pt would go down almost as fast as it goes up
this necessitated me constantly bumping the control handle whenever I had an implement on that I did not want dragging. The 3 pt 'speed control' could slow it down but than meant taking forever to purposely let the implements down as well so that was not the problem. After reviewing the parts manual and searching posts here on TBN I decided the o-ring on the 3pt lift cylinder was the culprit. I purchased a new o-ring from the dealer for about $2.50 as well as new o-rings for the cover. About $5.00 in parts altogether.
The first pic is the cover coming off, about a cup of fluid spewed out but I had already put something on the concrete to catch the oil
The second pic is a close up of the piston. This is as far forward as it comes with the lift arms all the way up.
Pic three I used a magnet to pull the piston out of the cylinder.
Pic four shows the inside of the cylinder, not too bad for about a 30 year old tractor.
Pic five shows the piston, old o-ring in place and new o-ring leaning next to it, you can already see the old o-ring probably isn't even making contact with the sides of the cylinder anymore.
Pic six shows old o-ring on the left and new o-ring on the right. This really gives you an idea of how badly the o-ring was worn.
Pic seven is the piston with the new o-ring in place.
Put it all back together, topped off the oil and took it for a test run. The 3 pt hitch is now good as new, even with my almost 400 lb tiller it didn't drop even a little bit in a 15 minute period.
If you went straight to it you could probably do this in under an hour but I got side-tracked a few times Gotta say I am pretty happy with this $5.00 repair.
(Hopefully all the attachments work)
Charles
I bought this 1970's or so Kubota B7100 along with some attachments. I found that with heavy implements the 3 pt would go down almost as fast as it goes up
this necessitated me constantly bumping the control handle whenever I had an implement on that I did not want dragging. The 3 pt 'speed control' could slow it down but than meant taking forever to purposely let the implements down as well so that was not the problem. After reviewing the parts manual and searching posts here on TBN I decided the o-ring on the 3pt lift cylinder was the culprit. I purchased a new o-ring from the dealer for about $2.50 as well as new o-rings for the cover. About $5.00 in parts altogether. The first pic is the cover coming off, about a cup of fluid spewed out but I had already put something on the concrete to catch the oil
The second pic is a close up of the piston. This is as far forward as it comes with the lift arms all the way up.
Pic three I used a magnet to pull the piston out of the cylinder.
Pic four shows the inside of the cylinder, not too bad for about a 30 year old tractor.
Pic five shows the piston, old o-ring in place and new o-ring leaning next to it, you can already see the old o-ring probably isn't even making contact with the sides of the cylinder anymore.
Pic six shows old o-ring on the left and new o-ring on the right. This really gives you an idea of how badly the o-ring was worn.
Pic seven is the piston with the new o-ring in place.
Put it all back together, topped off the oil and took it for a test run. The 3 pt hitch is now good as new, even with my almost 400 lb tiller it didn't drop even a little bit in a 15 minute period.
If you went straight to it you could probably do this in under an hour but I got side-tracked a few times
Gotta say I am pretty happy with this $5.00 repair. (Hopefully all the attachments work)
Charles
