Varian 4000 GC, Hardware Operation Manual

Page: 61 / 161

Periodic Maintenance
Procedure Interval
To ensure peak GC/MS performance, you need to perform periodic maintenance
on the vacuum and cooling systems. The following list identifies relevant
maintenance intervals.
•
Check the foreline pump oil level and oil condition weekly
•
Purge foreline pump oil weekly
•
Check cooling fans weekly
•
Change foreline pump oil and filter at least every nine months
Checking Foreline Pump Oil Level and Oil Condition
Ideally, the level and condition of the pump oil should be checked with the pump
switched off and warm, though a reasonable assessment can be made with the
pump running. The oil level should be between the maximum and minimum
levels on the sight glass. If the oil level falls below the minimum level, use a
funnel to gradually add more oil (88-299517-00) through the filler port until the oil
level is centered between the maximum and minimum levels.
NOTE: Pump models are subject to change. If not using a model DS-102 pump,
refer to the pump manual for details.
The pump oil should be clear and light amber in color. If the oil becomes thick,
dark in color, becomes opaque, or has a burnt smell, change it and the Oil Mist
Filter Cartridge as described in Changing Foreline Pump Oil.
Changing Foreline Pump Oil
To ensure peak performance and maximum pump lifetime, change the pump oil
whenever the oil becomes thick, dark in color, and has a burnt smell, or at least
every six months. The oil change should be performed while the oil is warm but
not immediately after stopping the pump.
Materials Needed
•
5/16" Allen Wrench
•
Varian GP Oil (88-299517-00)
27 of 127