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Mass Spectrometer Maintenance
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 must be performed while the oil is warm.
To change the pump oil:
1. Turn off and vent the MS.
2. Disconnect the pump’s power cord from the rear of the Saturn GC/MS.
3. Disconnect the vacuum hose from the foreline pump by removing the clamping
ring.
4. Pull the hose free, and place the seal on a clean lint free surface for later use.
5. 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.
CAUTION
Pump weighs 25 kg (55 lb.). Use proper lifting techniques.
6. Place an oil pan beneath the drain port to catch any spillage.
Hazardous chemicals may be present. Avoid contact with skin.
Use proper eye and skin protection.
7. Remove the plastic cover and the filler plug on top of the pump.
8. With the container in place to catch the oil, slowly remove the drain plug in the
front of the pump.
WARNING
Toxic residues from mass spectrometer samples will build up in used pump oil.
Dispose of all used pump oil in accordance with applicable regulations. Place
a hazards warning label on the container, if appropriate.
9. Tilt the pump forward and hold until oil flow ceases.
10. Return the pump to the horizontal and refit the plug.
11. Run the pump for approximately ten seconds with the intake port open. This will
remove any residual oil from the pumping block.
CAUTION
Avoid breathing oil mist coming from the exhaust port during this operation.
12. Remove the plug, tilt the pump, and drain the oil.
13. Return the pump to the horizontal.
14. Wipe the oil residue from the drainage port, and refit the drain plug.
