Manual 1808 Rev B p/n 001808 0000
16
07
Maintenance
Figure 7-1 – Return Line
One of the following two areas can be selected for
the oil to return to the pump when operating above
5 Torr:
• If the pump operating range is between 5 and
150 Torr, the returning oil should enter the pump
through the gas ballast valve, in which case the
valve must be left open.
• When the operating range is above 150 Torr,
the returning oil should enter the pump at the
suction port area.
An alternative to the above arrangements is
to drain the collected oil into a container and
periodically return it to the pump through the oil
ll. This arrangement is preferred if the collected
oil contains a substantial amount of water. In this
event, leave the oil to stand until the oil and water
separate, at which time the water will be decanted,
before returning the oil to the pump. With this
arrangement, take special care to keep the oil
clean.
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