4
3
2
1
Fig. 16:
Draining the operating fluid
1 Filler screw
3
O-ring
2 Sight glass
4
Drain screw
Draining the operating fluid
1. Unscrew the filler screw.
– Be careful with the O-ring.
2. Place a collection vessel below the drain hole.
3. Unscrew the drain screw.
– Be careful with the O-ring.
4. Allow operating fluid to drain into collection vessel.
Filling fresh operating fluid
1. Screw in the drain screw.
– Be careful with the O-ring.
2. Fill new operating fluid.
3. Check level.
4. Screw in the filler screw.
– Be careful with the O-ring.
7.3.3 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.
7.3.4 Changing the operating fluid filter
The operating fluid filter must be changed:
Maintenance
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