I used "Mystik JT-5 Tractor Transmission hydraulic Fluid".
I figured the pump was primed because the lift does work.
So far I attached a brass fitting with barbed end, attached hose ran hose to reservoir. Start engine pump worked fine fluid flowed steady and strong. Let it run for about 10 min until most the bubbles were gone. disconnected and returned plug in pump.
The lift still chattered when raising.
Next I removed plug and coil wire. turned engine until hydraulic fluid started coming out bleeder hole.
Replace plug while fluid was still coming out.
This didn't help. still chattering.
Not sure what to do next.