Have you got 3-phase power to run it?
That could be a problem, maybe just replace the motor.
90% of that grinder is the motor.

No to the 3 PH. Planning on using a VFD.
Spent $35 and just about threw out my back.
I've got the rests and the cup for the center, I took them off to move it.

Get the right size wheels for it, the ones mounted on it are too narrow. Wider wheels add to the inertia, so more umph when the grinding gets tough.
TheGrooveking