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The factory replacement was a white hard nylon type oring from JD.

This is the image of the PBY sleeve o-ring and the 3rd hose (PBY) or port connection it came from on the loader control valve. It has been working flawlessly since I changed the o-ring. All the other RS parts I replaced have also helped with the power and speed of lifting. It was never this...

I don't understand this system very well myself Tx Jim, but after the single oring part #14 for #12 was replaced all my rear hydraulics started working normal? When I look at my loader hydraulic layout, it is exactly like this drawing with the three hose hookup and the left line going to the...

Yes it has pretty much everything in the picture you sent.

Eureka!!! This took some time to figure out. Something this ridiculous was causing a big part of my 3 point lift problem and it was in the original gresen loader valve. This broken seal goes inside the power beyond sleeve on the left side of the loader valve. There are two pressure inlets on...

So there were several worn items. And I've isolated the two main culprits causing the lifting problem. When I took the rockshaft itself off the housing to install all new seals, I found a weak oring in the lift cylinder but a perfect bore, slightly damaged outer oring seals in the lift and lower...

Will do sir, When my parts arrive I'll get back. I hate it when threads like this just end with no fix results. Thanks

Thanks for the reply. I am not sure why the lift arms went all the way up but right after I dropped a box blade too hard full of dirt to knock it out. It immediately went as far up as it could physically go. I shut the tractor off immediately because I thought it would break something else. Not...

Hello all, I have been having hydraulic issues with my 830 JD 3 point lifting power this spring. How it started was I dropped the 3 point arms with a box blade too hard last year and it ended up breaking the cam follower tip that links to the rockshaft linkage inside the top cylinder housing...