2
1
Fig. 11:
Replacing sealing oil for radial shaft seal rings
1 Oiler
2
Sealing oil drain screw
Procedure in the event of minor oil loss
A decreasing oil level in the oiler and an oil leak below the lantern indicate a defective
external
radial
shaft seal ring.
► Check the level at shorter intervals and top up regularly as required.
– With this type of damage, the roots pump can continue to be operated for a time.
Procedure in the event of significant oil loss
A decreasing oil level, with no leaked oil visible below the roots pump, is due to a worn
inner
radial
shaft seal ring.
► Should this occur, arrange for maintenance to be carried out by Pfeiffer Vacuum Service, during
which all 3 radial shaft seal rings and the protective sleeve are replaced.
– This damage leads to an inadmissibly high oil level in the bearing chamber.
Changing sealing oil
1. In general, carry out a sealing oil change once a year.
2. Open the filler flap on the oiler.
3. Place the collection receptacle underneath.
4. Unscrew the sealing oil drain screw.
5. Fully drain the lubricant.
6. Screw the drain screw back in.
– Tightening torque:
32 Nm
7. Fill the oiler with lubricant to max. halfway.
8. Close the filler flap.
7.5 Cleaning the suction chamber
WARNING
Risk of crushing from rotating parts
Fingers and hands may be caught by rotating pistons within the connection flange. This results in se-
vere injuries.
► Keep limbs out of the reach of the roots pump.
Maintenance
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