Agilent Technologies 5975T LTM GC/MSD, Troubleshooting And Maintenance Manual

Page: 135 / 270

General Maintenance
10
Troubleshooting and Maintenance Guide 135
To Lubricate the Vent Valve 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)
• O-ring, vent valve (0905-1217). Replace if the old O-ring is
worn or damaged
The vent valve O-ring needs a thin coat of lubrication to ensure
a good vacuum seal and smooth operation. If the vent valve
O-ring does not turn smoothly or does not seal correctly,
lubricate it using this procedure.
Procedure
1 Vent the instrument.
2 Completely remove the vent valve knob ( Figure 10 ).
3 Inspect the O-ring. If the O-ring appears damaged, replace it.
4 Use a clean, lint-free cloth or glove to spread a thin coat of
high vacuum grease on the exposed surface of the O-ring.
5 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.
C A U T I O N
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.
C A U T I O N
Excess grease can trap air and dirt. Grease on surfaces of the O-ring
other than the exposed surface can trap air, resulting in air spikes
during operation.