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4020 hydraulic erratic

Bud Raber My 4020 with front end loader goes up fine but to lower it goes very slow and if i push lever on dash all the way it starts going back up. The hoses are hooked up correctly, can the valve under dash be rebuilt and how difficult or expensive??? Thanks
DANIEL KENNDY BUD; TRY THIS.SWITCH HOSES IN REMOTES WHERE YOU HAVE THEM PLUG IN,IF IT WORKS SLOWER GOING UP AND FASTER GOING DOWN. IF THIS HELPS LOWERING THEN TRY SWITCHING ENDS ON HOSES AND HOOK BACK LIKE THEY WERE ORIGINALLY. TRY UP AND DOWN AGAIN. COULD BE BAD END ON HOSES BLOCKING OIL FLOW.ON VALVE UNDER HOOD THERE IS A FLAT BLADE SCREW WITH JAM NUT LOOSEN AND BACK OUT A FEW TURNS.COUNT TURNS MOVED.VALVE BODY HAS 4 VALVES IN IT THAT MIGHT BE LEAKING BY SEATS.APPROX.$45.00 EACH PLUS PACKINGS AT END.LOOSEN END CAP SPRINGS UNDER PRESSURE.RED IS PRESS,BLUE IS RETURNS ACROSS FROM EACH OTHER.ALL VALVES THE SAME EXCEPT PRESS,HAS O-RING AT EACH END.HOPE THIS HAS BEEN HELP FULL.MY #252-568-3969


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