General Maintenance 4
5977B Series MSD Troubleshooting and Maintenance Manual 111
To Drain the Foreline Pump
Wet foreline pump only
Materials needed
• Book or other solid object approximately 5 cm thick
• Container for catching old pump oil, 500 mL
• Gloves, oil- and solvent-resistant
• Screwdriver, flat-blade, large (8730-0002)
• Hex key to remove drain plug (5 mm for Pfeiffer pump, 8710-1838)
Procedure
1 Vent the MSD.
2 If necessary, slide the foreline pump to a safe, accessible location.
The foreline pump may be located on the floor, on the lab bench next to or
behind the MSD, or under the analyzer chamber at the back of the MSD.
3 Remove the fill cap. (See Figure 10 on page 110.)
4 Place a container under the drain plug.
5 Remove the drain plug. Allow the pump oil to drain out. The oil drains
faster if it is still warm.
If necessary, you can place a book or other object under the pump motor to
tilt it up slightly.
6 Replace the drain plug after draining the oil.
The foreline pump can cause burns if touched when operating. It has a safety shield
to prevent the user from touching it.
The old pump oil may contain toxic chemicals. Treat it as hazardous waste.
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