1
3
2
MAX
MIN
Fig. 19:
Refilling operating fluid
1 Filler screw with manometer
3
O-ring
2 Sight glass
Procedure
1. Refill with operating fluid up to the top marking on the sight glass.
2. Screw in the filler screw.
– Be careful with the o-ring.
7.3.4 Rinsing and cleaning the rotary vane vacuum pump
Cleaning by changing the operating fluid
Pfeiffer Vacuum recommends, in cases of heavy contamination with process residues,
cleaning the inside of the vacuum pump with several operating fluid changes.
Required consumable material
● Operating fluid
● Maintenance set level 1
Required aids
● Collection receptacle (> 7 l)
Change operating fluid for cleaning
1. Operate the vacuum pump with the gas ballast open, until it is warm.
2. Perform an operating fluid change.
3. Check the pollution level and repeat the changing of the operating fluid if necessary.
4. In case of highly contaminated operating fluid, replace the operating fluid filter and the exhaust fil-
ter.
7.3.5 Changing the operating fluid filter
The operating fluid filter must be changed:
● in event of saturation
─ You can recognize a saturated operating fluid filter by the fact that the filter housing is cool on
the outside while the rotary vane pump is running at operating temperature.
● with each operating fluid change
● according to maintenance level
Maintenance
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