4 Maintenance Procedures
114 January 11, 2016, 715004599 Rev. B
3. Using the funnel, add Anderol vacuum oil, type GS 495, into the oil filler aperture
until the oil reaches the oil level sight glass MAX level.
4. Ensure that the O-ring on the oil filler plug is clean and properly seated.
5. Use the 8-mm Allen wrench to fit and tighten the roughing pump’s oil filler plug.
Tip: When the oil filler plug is tightened, the plug seals by means of an O-ring.
Compression is controlled by the O-ring groove depth in the plug. Overtightening
does not improve the plug seal; it merely makes the plug difficult to remove.
Tip: 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 darkens in color 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 when the pump reaches operating temperature.
• When the pump begins to run at normal operating temperature, the spilled oil
produces a slight odor.
Cleaning the source components
Clean the sample cone and cone gas nozzle when these conditions apply:
• The sample cone and cone gas nozzle are visibly fouled.
• You dismissed LC and sample-related causes for decreased signal intensity.
If cleaning the sample cone and cone gas nozzles fails to increase signal sensitivity, also
clean the ion block and isloation valve (see page 115).
If cleaning the ion block and isolation valve fails to increase signal sensitivity, also clean
the ion guide assembly (see page 135).
Notice: To avoid oil leakage, and consequent damage to the pump, when
refitting the oil filler plug, ensure that:
• the plug is not cross-threaded;
• the O-ring is not pinched;
• the plug is not overtightened.
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