5 Maintenance
Rough Pump
Agilent 6475 Triple Quad LC/MS System User Guide 85
Replacing the filter
Perform this procedure yearly.
Tools needed:
• Pair of pliers
Parts needed:
• Filter
• Filter cap O-ring
• Small cap O-ring
To replace the filter,
1 Place the instrument into 'Standby' then 'Vent'.
2 Allow the rough pump to turn off automatically, this should take about 15
minutes.
3 Unplug all power cords from LC/MS instrument.
4 Unplug the rough pump
5 Disconnect the exhaust tube.
6 Unscrew the filter cap.
The filter cap is spring loaded.
7 Remove O-ring from the filter cap.
8 Remove the old filter.
9 Remove O-ring from the filter.
10 Install the new small O-ring on the new filter and install the filter into the pump
in the proper orientation.
11 The distance of filter should not be < 2 cm from outside cap thread.
12 Make sure the filter is > 2 cm from outside cap threads. When properly
installed:
• The filter cap is flush to the pump.
• The back end of the filter is seated inside the filter mount.
13 Install the new large O-ring and filter cap.
14 Connect the exhaust tube.
15 Plug in the rough pump and all power cords from LC/MS instrument.
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