General Maintenance 4
5977B Series MSD Troubleshooting and Maintenance Manual 137
To Lubricate the Side Plate O-Ring
Materials needed
• Cloths, clean (05980-60051)
• Gloves, clean, lint-free
• Large (8650-0030)
• Small (8650-0029)
• Grease, Apiezon L, high vacuum (6040-0289)
The side plate O-ring needs a thin coat of grease to ensure a good vacuum seal.
If the side plate O-ring appears dry or does not seal correctly, lubricate it using
this procedure. A good test is to wipe off the side plate with methanol, then
close the analyzer chamber. If the O-ring has enough grease on it, it will leave a
faint trace on the side plate.
Procedure
1 Vent the MSD.
2 Open the analyzer chamber.
3 Use a clean, lint-free cloth or glove to spread a thin coat of high vacuum
grease only on the exposed surface of the O-ring. (See Figure 20 on
page 138.)
4 Use a clean, lint-free cloth or glove to wipe away excess grease. If the
O-ring looks shiny, there is too much grease on it.
5 Close the analyzer chamber.
6 Pump down the MSD.
Vacuum seals other than the side plate O-ring and vent valve O-ring do not need to be
lubricated. Lubricating other seals can interfere with their correct function.
Do not use anything except the recommended vacuum grease. Excess grease can trap
air and dirt. Grease on the surface of the O-ring other than the exposed surface can trap
air, resulting in air spikes during operation.
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