ok, i have this unit that will side shift fine, travel fine but when you try to lift the motor does turn on and spin, i see its "cavitating" in the tank, thought it was a valve stuck open, replaced it but still doing the same thing, I'm thinking the valve in the cylinder may be stuck, we can't do a big tear down to check due to located in a store and can't leave down or open, any thoughts on this? we have power to the solenoid, we did "bump" the lift with the valve out and it gets pressure as well. thanks in advance.