12. Fill with new operating fluid and check the fill level .
7.4.3 Rinsing and cleaning
If the inside of the pump is heavily contaminated with process residues, Pfeiffer Vacuum recommends
multiple operating fluid changes to drain the dirt.
Changing the operating fluid for dirt drainage
1. Operate the pump with the gas ballast open, until it is warm.
2. Drain the operating fluid again.
3. Check the contamination level and repeat the flushing operation if necessary.
4. Remove the cap.
5. Clean the inside of the cap and the outside of the pumping system (without cleaning agent).
6. If accessories are installed, replace the corresponding filter elements.
7. Screw in the operating fluid drain screw.
– Be careful with the O-ring.
8. Fill with operating fluid and check the fill level .
9. Screw in the operating fluid filler screw.
– Be careful with the O-ring.
7.5 Cleaning the gas ballast valve
The gas ballast valve is likely to be contaminated if dusty ambient air is sucked in.
7.5.1 Gas ballast valve – standard version
1
2
3
5
4
6
9
10/11
8
7
14
12/13
15
17
16
Fig. 24:
Remove and clean gas ballast valve (standard version)
1
Screw
10
Washer
2
Gas ballast knob
11
Plate spring
3
O-ring
12
Silencer screw
4
O-ring
13
O-ring
5
Screw
14
Screw
6
Flange
15
Valve housing
7
O-ring
16
O-ring
8
O-ring
17
O-ring
9
Screw
Maintenance
40/66
