I have completely overhauled the valve body with seals and O rings and checked the lift cylinders separately for leaks. (no leaks) When I just start pressing the lift peddle to go up, it starts going down slowley and when I push it a little more it stops and a little more and it starts up. I also checked the lift lock and override valve with O rings and seals. If I hold the lift peddle in the up position where it starts leaking down and press the tilt peddle ( when tilt is bottomed out) it starts lifting the bucket. I am out of ideas unless it is a defective port relief valve. I dont know any Ideas?