Hydr. Supply for the Feeder on my wood chipper always return to neutral

[Gaetan B]

I have a 5075 M with rear Deluxe 3 valves hydraulics. When I operate my Wood Chipper even if I select the rotating knob to hydr. motor and use the valve with the flow control I cannot keep the valve in working position. The handle always return to neutral I have tried to open the flow control to max as the Frontier WC already have one...
Any suggestions!

 

[Gaetan B]

I have a 5075 M with rear Deluxe 3 valves hydraulics. When I operate my Wood Chipper even if I select the rotating knob to hydr. motor and use the valve with the flow control I cannot keep the valve in working position. The handle always return to neutral I have tried to open the flow control to max as the Frontier WC already have one...
Any suggestions!

I should add that I am talking about the oil supply of the hydraulic feeder as the chipper cutter is working out of the PTO. The tractor is a John Deere. As the oil gets warmer it tends not to hold in working position and return to neutral faster and for no apparent raisons. I am suspecting over pressure of the return line...anybody has gone through this?