Still having 3 point lift issues

I've make a couple of post about this problem and here's where things stand now, I've replaced the seals for the lift piston and all the other O rings, and I've rebuilt the pump and here's whats happening, pressure test only shows 500PSI it did go to 1000 & 1500 a couple of times but dropped back to 500, when I lift the 3 point to a certain height it will drop slowly to a point and then jerk up I can lift it nearly all the way (what I call transport height) it'll hold, also I can put the draft control; lever (on the right hand side of the seat directly under the seat) in the down position and when I raise the lever and I get the lift lever about 3/4's the way up it feels like something inside breaks and the 3 point drops rapidly and then there is no resistance at all to the lift lever now after I put the draft control lever back in the up position the lift lever starts working, put the draft control lever back down and the lift lever will work until I go pass about 3/4's point it again feels like something breaks and there is no resistance again until I put the draft lever back in the up position
 
Pressure will only happen when the flow is being restricted, so 500 psi most of the time might be OK. Only way to see the max would be to chain the arms down and look at the gauge while trying to make the arms go up, or by trying to lift something that was actually too heavy for the system to lift. What were you doing when you saw it go to 1500?

Drifting down and then going back up is usually an internal leak and the system doing automatic position corrections because of the leak inspired drift down.
 
Could be a faulty pressure relief valve.

It is easy to change on that tractor. Just remove the adapter plate from the top of the lift housing and it is the little spark plug looking thing down on one of the holes.

The unloading valve O ring could be leaking also.

Zane
 

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