VAC Eagle hitch hydraulic problem

It seems to want to raise all of the time. If I try to force the lever forward, it's as though a valve must be sticking. If I put a load on it and try it a few times it seems to release and work.

Now I want to fix this but I'm not entirely certain what it might be. Do you think the trouble is in the valve block? Perhaps a sticking poppet?

Appreciate any ideas.

Frank

In the neutral lever position the control valve (bypass) valve is open circulating the pump discharge back to the sump. When you put the lever in the raise position, you are closing the control valve restricting or closing off the oil return.

The other way of restricting the return is a smashed return oil line or the return filter is plugged. That is the same result as putting the control lever in the raise position. That is not likely in your case.

When you put the lever in raised position the control valve is closed mechanically with the actuator. When you put the lever back to neutral the control valve is opened by a spring. So you know what is wrong Frank. If the oil passages in the valve block are clear your control valve is binding, sticking in the closed or partial closed position. Spring may be weak or broken.

Joe

I have great pump pressure, and the screen is clear. You can hear the pressure trying to push almost all the time. I bet I have a broken spring now you explain it to me.

Back to the book.

Thanks as always!

Frank

Joe