I bought it because I wanted to build a vacuum kiln for wood.
I took the pump to Tech Shop and tried to rotate the fly wheel and unfortunately, this thing had seized. I had a choice scrap it for $35 or try to get it to work.
I spent less than $50 to get it working.
Step 1: Use Leverage to Free the Vanes
The vanes were rusted to the walls of the inside cylinder. Using a crowbar and a 2x4 that was cut down to a 2x2, it was possible to get the vanes free and successfully rotate the large flywheel.
Step 2: Does the Pump Suck?? If So, Drain the Old Oil -- Else Full Rebuild
The next step was to drain the old oil and see what it does with clean stuff.
This is what the old oil looked liked.
Step 3: Remove the Exhaust and Dump in Fresh Oil
This is what it looked like draining it the 2nd time I did this.
Step 4: Extend the Oil Drain and Keep Changing the Oil
This made it really easy to change the oil one pint at a time. I would cycle the power for the motor for about 15 seconds each time.
After 5 oil changes, the oil was running clear!
Step 5: Change the Rotted Belts
Step 6: Test the Vacuum
I live at 1000 above sea level. 29 inches of mercury is a perfect vacuum at that altitude. This gauge reads almost that.
Tech Shop helped me pull this off -- I made this work at Tech Shop!!!