60 Rockshaft Piston Leaking-Again

I have had an odd experience with my rockshaft piston failing. I say failing, because I have repaired this issue a couple of times and now I am wondering if it is something I am doing or something is out of specifications? The first it time happened was in the last 5 years, I repaired it then and it lasted up until last fall until I used the tractor extensively to plow up a 4 acre field. I tore the power troll off the back and pulled the piston out of the rockshaft housing, replaced the leather and rubber o-ring and put it back it. Well this repair lasted until last week when I had the sprayer on the 3 point. Now its having issues again such as the rockshafts will not stay up unless I keep my hand on the power troll lever flowing hydraulics to the piston. I am wondering if 1) I am cutting these 0-rings when I am tapping the piston back in from the backside of the rockshaft housing with the power troll unit removed or 2)There is a rough spot on the inside of the rockshaft cylinder housing that's cutting the oring on the piston? or 3) The cylinder housing is out of round from wear and it wont hold an o-ring on the piston when under heavy loaded situations. It seems to fail after using the 3 point with a heavy load such as plowing with my 3 point plow, brush hogg or water tank. Anyone else have a suggestion?
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Is that picture current ? If not pull it back apart and check it out. Cyl. may need honed if it has a rough spot ? Or replaced if really bad ?

I'd go to a HYD. shop and see if they had a better designed seal to fit into that groove (that's what I did on my 720D) or at least a plastic back up ring that will hold up better than the paper ones that may of torn upon assembly.

Have you tested your HYD. pressure ? it may be too high ?
Gasket on the cylinder could of blow too ? Are you gaining and rear end oil and loosing hyd. oil ?
 
We always removed the rockshaft housing . Hone with a find hone in a figure 8 pattern .The cylinder is tapered on the end O-rings can go by without getting cut .
 
Not following how you would hone the inside of a cylinder in a figure 8 pattern? A hone goes down equally inside the cylinder unless your talking about moving it up and down making a figure 8 pattern?
 
No the picture is from when I fixed the o-ring/leather from about 5 years ago, I just posted it as a reference for whoever would read my post to get an idea of what I am doing. I was wondering if the cylinder is in bad shape, I never heard of that happening on a hydraulic rock shaft cylinder since it is different from a say an engine cylinder subject to the forces of combustion, but I guess that is possible???? I plan to take it down in a couple of weeks when I have the time. (WAY TOO BUSY TO BREATH ) as of now. Thanks for the typs on the hydraulic shop.

I have not tested the hydraulic pressure so that is a good point.

I don't think its the seal on the cylinder between the end of the cylinder and the rock shaft housing because I am not loosing any fluid into the transmission or in gereral Im not loosing hydraulic fluid anywhere. In September when I replaced the or-ing and paper/leather seal it fixed the issue right away (for about 6 months that is). I believe that would rule out the gasket between the cylinder and the rockshaft housing???-
 
The cylinder in my 720D was scored up from metal or dirt getting in it. A new packing didn't last too long. I had to put a used one in it as no new ones could be found. Hyd. shop fixed me up with some different sort of seals that are to last longer.
How was your cylinder before ? Did it have any scoring ?
 
I am having a hard time remembering, but I think I ran a finger down in there to see if there was any rough spots. Since I didn't have a problem for a couple of years, I figured I had messed it up upon installing the piston. But if I take it apart and find an issue, I will look around and see if I can find a replacement cylinder or hone the housing?
 

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