- Dec 24, 2019
Yes, there are electrical issues.. that #14 wire being used as a current-limiter or even "fuse" ....at the top of the list.
That said, I suspect you ALSO have mechanical issues.
Cumulative wear... damage.. lube fail... distortion under load? Something that is causing binding when heavily loaded, such that the actual "present-day, REAL capacity", not the "as new, CLAIMED" capacity .... is being overly stressed mayhap?
"Heavier load" is exactly what it says it is, but there should otherwise not be THAT 'dramatic' a difference between initial lift, and resumed lift.
IF... it needs new parts... or is over-stressed, in general?
A whole 'nuther lift could indeed be cheaper and faster than the cost of f**k-around time and money with this one..
Dig deeper, first, into the source of the difference..
I suspect that 'initial lift' is lifting only the weight of the actual lift, and picks up the vehicle while already moving - there will be 100mm or so of travel where the load increases as the weight transfers from the vehicle's suspension and tires onto the lift arms. As long as full load torque (actually breakdown torque) exceeds the load torque, the motor will be fine.
Trying to start the lift while already elevated means that the motor means that the motor needs to supply adequate starting/pull-up torque to move the car. Single phase induction motors, including three-phase motors fed via phase generators, are notoriously worse at providing starting torque compared to full load torque.