Model 7400. AC drive and lift. The forks drift up when reach / retract is pressed. I have adjusted the prop valve (sol 2) and I can correct the issue. Problem is, when prop valve is adjusted to eliminate the fork drift, I am unable to feather the lower. If I adjust the prop valve to regain feathering of the lower function, I have the fork drift issue. Seems I can either get one or the other, but not both.

Pulled the prop valve and checked for metal in the valve. I actually pulled almost all the valves and checked them. found no foreign objects.

Any advice????