Replacing the roughing pump oil 5-97
10. Use the 8-mm Allen wrench to fit and tighten the roughing pump’s oil
drain plug.
Tip: When the oil drain plug is tightened, the plug seals with an O-ring.
Compression is controlled by the O-ring groove depth in the plug.
Increased torque does not improve the plug seal; it only makes the plug
difficult to remove later.
11. Using the funnel, pour all the oil from the 1-L container into the oil filler
aperture.
12. Wait a few minutes, and then recheck the oil level.
13. Ensure that the O-ring on the oil filler plug is clean and properly seated.
14. Use the 8-mm Allen wrench to refit the oil filler plug.
15. Start the instrument (see “Starting the instrument” on page 2-2).
16. Gas-ballast the roughing pump (see “Gas ballasting the roughing pump”
on page 5-15).
Tips: After you add oil to the pump, the following situations can occur:
• The oil level drops slightly during the first month of operation.
• The oil changes color (darkens) over time.
• After running the pump for 12 to 48 hours, it is common to see a few
drops of oil near the filler plug. Excess oil around the lip of the filler
plug will run down and drip off the pump once the pump reaches
operating temperature.
• When the pump begins to run at normal operating temperature,
spilled oil smells slightly.
Caution: To maintain pump performance, use Anderol vacuum
oil, type GS 495.
Caution: Observe these precautions to avoid oil leakage when
fitting the oil filler plug to the roughing pump:
• Ensure that the plug is not cross-threaded.
• Ensure that the O-ring is not pinched.
• Do not over tighten the plug.
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