135 3 point hitch loses its position

eye4iron

Member
What is the procedure for checking a 3 point hitch arms for
slowly dropping. When bush hogging the arms are set at the
right height and a few minutes later you look back and the
arms have lowered.
I suspect it may be the lift piston and rings. Is there a way to
verify before I take it apart? This tractor does have the 2 lever
aux valve for a remote cyl.
 
Hello, of equal importance to the linkage falling is whether it resumes the position that you set it to after it has fallen. If the linkage does not return to the set position it suggests that there is an internal linkage problem. The ends of the lift arms should not drop more than 1/2" to 3/4" before it corrects itself.

If you have an isolating valve fitted at the front of the hydraulic cover and select the external supply then it is possible for the arms to drop and not be corrected. The most likely source is the piston and/or rings or even a split cylinder. It can also be due to the seals on the stack pipe or even a badly worn isolating valve.

Test it with the internal (3-point) selected. It should perform as above.

DavidP, South Wales
 
I was literally just going to ask the same exact question. My tractor is doing the same thing and I have the optional 2 lever aux valve. Trying to decide if I should tackle it myself or just bring it to the dealer.
 
(quoted from post at 22:17:20 01/17/17) What is the procedure for checking a 3 point hitch arms for
slowly dropping. When bush hogging the arms are set at the
right height and a few minutes later you look back and the
arms have lowered.
I suspect it may be the lift piston and rings. Is there a way to
verify before I take it apart? This tractor does have the 2 lever
aux valve for a remote cyl.

Until you get around to fixing your lift, a set of limiter chains on the mower will eliminate that problem. My 8N has position control that works fine but I use the limiter chains on the mower. It keeps the mower at the height that I want it and I just lower the lift arms all the way down. There is no strain on the 3 point holding the mower at the correct height. The limiter chains do that.
 
My lift would slowly leak down and I replaced the original lift piston with the new version using a rubber o-ring and silicone sealing ring. Here is a link the post with some pics of what to watch out for:


http://forums.yesterdaystractors.com/viewtopic.php?t=1158147&highlight=



I also agree with the poster that the lift should return to the correct height even if it slowly drops over time due to an internal leak.

Good luck.
 
You will be leaking internally somewhere. The original hydraulics will pump and maintain position but with the spool valves added the only time the cylinder gets oil is when you push the left lever forward. If the external ports are plugged you can lock the left lever forward and just use the quadrant lever to the side of the seat and it should work same as with no valves added. I haven't tried this as of yet with my 65 but that is what the manual i just got says. So if it works great if not i'm just repeating what the book says. Good luck and I will try it on mine when it gets warmer.

Steven
 
Either it's a bunch of small leaks, or the pump is weak. My 2135 industrial didn't have any add ons, just the 3 point. With a very bad leaking lift cylinder the 3 point would keep its height at an idle with a relatively heavy shredder. I'd pressure test it first, and or it may have a stuck open bypass valve on the pump.
 

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