Can you post the RPM of the motor and the diameter of the pulleys? That way we can calculate the pump RPM and see what it is currently running. I can't clearly read the motor tag in that pic, does look like a Chinese motor though.
It's an older, small output champion compressor, single stage, but a well built unit. Looks to be pressure lubricated.
Thats a Jap motor..Excellent quality stuff..