Micromeritics Gemini VII 2390a, Operator'S Manual, Page: 236 / 426

Preventive Maintenance Gemini VII
9-10 239-42828-01 - Dec 2012
5. Remove the plug from the oil-fill port.
6. Slowly add oil to the port until the level is midway between the indicator lines in the oil-level
window when the pump is running.
7. Check the washer or O-ring used at the oil-filling port and replace if necessary.
8. Insert the oil-fill plug and turn clockwise to tighten.
9. Check the alumina in the oil vapor trap. If most of the pellets are no longer white, replace the
alumina before reattaching the vacuum pump.
10. Reconnect the vacuum pump hose.
11. Reconnect the power cord to the power source.
12. Allow the pump to run a few hours (overnight if possible) to eliminate air and moisture from the
fresh fluid and to produce efficient vacuum operations.
Do not allow oil to rise above the midway position when the pump is running. Doing so
may cause oil to splash into the oil filter and contaminate it.
Oil-fill port
Midway level