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just to double check i went back out and put plate on for pressure test and started tractor, i pulled the hydraulic fill cap off to look inside...definitely heard high pitch whistle from valve, and tractor/pump sounded like it was under a load.
hen I might be looking somewhere besides the pump. I know you think it is all good, but to me, the unloader is prime suspect, unless you assembled the check valve wrong as the fellow did in the other post you made.
i pulled the unloader valve, not sure if it was stuck when i did that. i put new o-ring on it and made sure it moved as should with new o-ring. is it possible thats not assembled right? there is a bushing i took out and cleaned and put back the way it was installed. the guy that owned it before me did work on the hydraulics and im not sure what he took apart before i got it. i did take the check valve out and cleaned/checked it.
is it possible to remove check valve for troubleshooting? and see what lift does?
don't see any reason why not. Without weight on lift, the arms may rise without touch control command , lifting on back pressure alone. But whatever it does may give useful information for troubleshooting.
just got home and i pulled the check valve(appeared to be in correctly) started the tractor and the arms lifted with control lever up or down. i was able to push them down using my weight, they would rise back up
xactly as I expected.
t this pointthe easiest thing to do is to use Overland posters wire probe to try to determine whether unloader valve is moving or not.
"I was manipulating the unloading valve with a bent piece of wire. I need to look a bit closer at the diagrams to see exactly what I was doing, but from the control valve side of the cylinder with my hand through the shift cover, I could hold the valve at the bottom of its travel and observe no noise or turbulence. Releasing the valve (with the touch control up) would allow it to move back, which would load the engine a moment and blow the valve in the sump. The turbulence I assume coming from the valve under the oil. "
Me, "When you push the unloader valve in with the wire probe, you push it to the unload position. Then upon commanding lift, it jumps back to the position for lifting (blocks unload flow) and the next thing that should happen is that the check valve should open, allowing flow to ram (past the test port on accessory plate)'.
IF the unloader is found to be moving, then I will fall back to the position that since it never worked since you acquired it, and you said previous owner had removed/assembled various parts, that perhaps he put the valve bushings in incorrectly and some passages are not connected properly. I am not absolutely sure that those 3 bushings could be installed incorrectly, but believe that it is possible.