I have a 2003 PB50 that won't pick itself up onto the truck without alot of coaxing. If you pull the mast in as far as possible and tilt back and forth it will slowly inch off the ground to mount. Both cylinders have been replaced in the past 6 months. On the ground pressures are at 2500+ psi. It feels like it is bypassing somewhere. Any help would be greatly appreciated.