heymccall
Senior Member
When function is activated, via a pilot hose, the main spool for that function shifts to allow oil to that cylinder (or other hyd implement).
That oil going out to the cylinder creates a "load" for the pump to shift displacement. When the pump shifts internally, the pressure rises to that circuit.
When the arm (stick) swings past free hang (vertical) there is no load and the pump destrokes. Once the momentum is gone, a load exists that strokes the pump back up.
That's as simple as I can make it sound. There is a component in there to keep the pump stroked when the cylinder has no load. That's what is suspect.
Perhaps someone else here can point you to what to chase.
That oil going out to the cylinder creates a "load" for the pump to shift displacement. When the pump shifts internally, the pressure rises to that circuit.
When the arm (stick) swings past free hang (vertical) there is no load and the pump destrokes. Once the momentum is gone, a load exists that strokes the pump back up.
That's as simple as I can make it sound. There is a component in there to keep the pump stroked when the cylinder has no load. That's what is suspect.
Perhaps someone else here can point you to what to chase.
