Thermo Finnigan LTQ - Replacing the Turbomolecular Pump Insert

MS Detector Maintenance
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___________________________________________ Replacing the Turbomolecular Pump Insert
_______________________ Finnigan LTQ Hardware Manual _____________________
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4.8 Replacing the Turbomolecular
Pump Insert
The rotating, interior portion of the turbomolecular pump, referred to as the
turbomolecular pump insert, should be replaced after 20,000 to 30,000 hours
of operation or if the bearings fail.
Replacing the turbomolecular pump insert involves the following steps:
1. Shutting down the system
2. Removing the left front panel
3. Disconnecting the power cable from the turbomolecular pump
4. Disconnecting the foreline from the turbomolecular pump
5. Loosening and removing the six 4 mm socket-head screws that hold the
insert to the pump
6. Removing the insert
7. Reinstalling a new inset
8. Installing and tightening the six screws that hold the insert to the pump
9. Connecting the foreline to the turbomolecular pump
10. Connecting the power cable to the turbomolecular pump
11. Reinstalling the left front panel
12. Starting up the system
Caution. The turbomolecular pump insert is very delicate. We recommend
that a Thermo Electron Field Service Engineer replace the turbomolecular
pump insert.