3
4
2
1
Fig. 15:
Draining the operating fluid
1 Filling screw for operating fluid
3
O-ring
2 O-ring
4
Drain screw for operating fluid
Consumable
● Operating fluid
Required tools
● Allen key, 5 mm
● Allen key, 6 mm
● Calibrated torque wrench (tightening factor ≤ 2.5)
Draining the operating fluid
1. Shut down the vacuum pump and allow it to cool if necessary.
2. Vent the vacuum pump to atmospheric pressure via the intake side.
3. Unscrew in the operating fluid filler screw, watching out for the O-ring at the same time.
4. Place a collection receptacle below the drain hole.
5. Unscrew in the operating fluid drain screw.
6. Drain the operating fluid in a warm state, if possible.
7. Screw the filler and drain screws back in.
8. Switch on the vacuum pump with the vacuum flange open for max. 5 seconds.
9. Tilt the vacuum pump slightly to completely empty it and drain the remaining operating fluid.
10. In the event of heavy contamination, change the operating fluid several times (flushing).
11. Screw in the drain screw, watching out for the O-ring in the process.
– Drain screw tightening torque:
3.0 Nm
12. Fill with new operating fluid and check the fill level.
13. Screw in the filler screw while at the same time ensuring correct fitting of the O-ring.
– Filler screw tightening torque:
3.0 Nm
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.
Maintenance
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