Specifications

General Maintenance 4
5975 Series MSD Troubleshooting and Maintenance Manual 89
Maintaining the Vacuum System
Periodic maintenance
As listed earlier in Table 8, some maintenance tasks for the vacuum system
must be performed periodically. These include:
• Checking the foreline pump fluid (every week)
• Checking the calibration vial (every 6 months)
• Ballasting the foreline pump (daily in MSDs using ammonia reagent gas)
• Replacing the foreline pump oil (every 6 months; every 3 months for CI
MSDs using ammonia reagent gas, standard foreline pump)
• Tightening the foreline pump oil box screws (first oil change after
installation, standard foreline pump)
• Replacing the diffusion pump fluid (once a year)
• Checking the dry foreline pump diaphragms (typically every 3 years)
Failure to perform these tasks as scheduled can result in decreased
instrument performance. It can also result in damage to your instrument.
Other procedures
Tasks such as replacing a Micro-Ion vacuum gauge should be performed only
when needed. See “General Troubleshooting” on page 29 and see the online
help in the MSD ChemStation software for symptoms that indicate this type of
maintenance is required.
More information is available
If you need more information about the locations or functions of vacuum
system components, See “Vacuum System” on page 171.
Most of the procedures in this chapter are illustrated with video clips on this
5975 Series MSD User Information DVD.