5.3 Exchanging the Lubricant
Notice safety information 0.3 to 0.5.
The oil-fill port must be sealed air-tight. In the presence of a vacuum, the
entry of air may cause oil-containing gas to enter the pumping chamber via
the impeller seals.
When using PFPE as intended, PFPE is not subject to ageing. It must only be
changed if it is contaminated by the process gas. It can only be determined
individually when PFPE is so contaminated that it must be changed.
Change the lubricant more frequently when pumping corrosive vapours or
large amounts of dust or when cycling frequently from atmospheric to work-
ing pressure.
Before removing the oil-drain or oil-fill plug always switch off the pump
first and vent to atmospheric pressure.
When the pump has become warm during operation the casing and the oil
temperature may exceed 80 °C.
Leave the pump to cool down. Always wear protective gloves also to pro-
tect yourself against aggressive residues in the lubricant.
CAUTION
WARNING
Oil ll ports
Oil drain ports
LEYVAC LV 80 LEYVAC LV 140
Fig. 5.1 Positions of Oil Ports for Exchanging Lubricants
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