So I have encountered an issue with the hydraulic lift on the Ford LGT 165 I am rebuilding.
The hydraulic lift works very slow and can't lift the lift carriage past a few inches. The transmission powers the trans axle with no problem. The problem is isolated to the lift circuits.
I replaced the lift valve entirely with one from a working tractor to eliminate that as a possibility.
I have also checked the cylinder for internal leaks by disconnecting one hose from the control valve, running the tractor and working the cylinder by the remaining connected hose and checking for oil leaking past internal seals. No internal cylinder leaks detected.
I have checked the input steel hydr. lines for heat to determine if there is a blockage somewhere. None detected.
I really don't want to dis-assemble the eaton hydraulic pump if I don't have to.
I have not done an actual pressure test but I have a pressure gauge being shipped to me. The symptoms of the Lift Cylinder not lifting any weight and operating slowly indicates a low pressure situation, but I have not detected any leaks or blockages anywhere.
Is there any troubleshooting step I have missed?
If the hydro drives the transmission fine, does that mean it should in theory provide enough flow and pressure for the lift circuit?
Thanks for your thoughts,