Waters Xevo TQD Overview And Maintenance Manual page 182

4 Maintenance Procedures
When the oil drain plug is tightened, the plug seals by means of an
Tip:
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.
Requirement:
vacuum oil, type GS 495.
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.
Notice:
roughing pump, observe these precautions:
• Ensure that the plug is not cross-threaded.
• Ensure that the O-ring is not pinched.
• Do not overtighten the plug.
14. Use the 8-mm Allen wrench to refit the oil filler plug.
15. Gas ballast the roughing pump (see
After you add oil to the pump, the following situations can occur:
Tip:
• The oil level drops slightly during the first month of operation.
• The oil changes color (darkens) over time.
• After the pump runs for 12 to 48 hours, a few drops of oil often
appear near the filler plug. Excess oil around the lip of the filler plug
runs down and drips 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.
182 March 14, 2014, 715004387 Rev. B
To maintain pump performance, use only Anderol
To avoid oil leakage when fitting the oil filler plug to the
page 102).