Waters Xevo TQD, Overview And Maintenance Manual

Page: 107 / 250

Adding oil to the roughing pump
March 14, 2014, 715004387 Rev. B 107
To add oil to the roughing pump:
1. Vent and shut down the mass spectrometer (see the instrument’s online
Help for details).
2. Use the 8-mm Allen wrench to unscrew and remove the roughing pump’s
oil filler plug (see the figure on page 102 ).
Requirement:
To maintain pump performance, use only Anderol
vacuum oil, type GS 495.
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.
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.