CAUTION
Scalding from hot operating fluid
Danger of burns when draining operating fluid if it comes into contact with the skin.
► Wear protective equipment.
► Use a suitable collection vessel.
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.
Prerequisites
● Vacuum pump switched off
● Vacuum pump vented to atmospheric pressure
● Vacuum pump has cooled so that it can be touched
● Operating fluid still warm
7
2
1
3
6
5
4
Fig. 13:
Draining the operating fluid
1 Filler screw
5
Drain screw
2 O-ring
6
O-ring
3 Drain hole
7
Sight glass
4 Collection vessel
Required consumables
● Operating fluid of the vacuum pump
Required tools
● Allen key,
WAF 5
● Calibrated torque wrench (tightening factor ≤ 2.5)
Required aids
● Collection vessel (> 0.5 l)
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.
Maintenance
36/60
