•
1.0-liter (1 US qt) or larger container
Gas Ballast Valve
Filler Plug
Drain Plug
To change the pump oil:
1. To turn off and vent the MS, go to “Turning Off the Mass Spectrometer”
(page 34).
Disconnect the pump’s power cord from the rear of the MS.
Dangerous high voltages are present. Unplug power cord.
Hot Surface. Take appropriate precautions. Wait for the pump to be cool
enough to touch before continuing the oil changing operation.
2. Disconnect the vacuum hose from the foreline pump by removing the
clamping ring.
3. Pull the hose free, and place the seal on a clean lint-free surface for later
use.
4. Carefully place the foreline pump on a raised surface. The surface should be
high enough to allow a 1.0-liter (1 US qt) or larger container to be placed
under the drain port when the pump is tilted forward. A container with an
opening diameter of at least six inches will make this task easier.
5. Place an oil pan beneath the drain port to catch any spillage.
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Summary of Contents for 4000 GC
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