Can you put up pic of what you turn/unscrew to lower the lift.
What ever you turn should just bleed off pressure from the ram.
Seems like it is blocked behind this screw and not releasing pressure.
Know nothing about this type of lift.
Assume it works just like a bottle jack.
If pulleys/idlers/bearings ok,let belt wear in a bit.
Had a brand new mower once that that squealed all the time.
Replaced belt and ok.
That was at the dealership.
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