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.
NOTICE
Property damage from incorrect cleaning procedure
Flushing fluid and process media that enters the bearing and oil chambers will stick.
► During the cleaning processes, always protect all bearings with sealing gas in order to prevent a
contamination of the lubricant and bearing chambers.
The clearance between pistons and housing are within a tenth of a centimeter range. Sustained, accu-
mulating contamination has the following effect:
● the friction heat inside the roots pump increases
● the power consumption of the roots pump increases
● the pistons jam
Required aids
● Brushes and cleaning agents
● Suitable vessel for collecting the cleaning fluid
● Absorbent materials for absorbing the cleaning fluid
Procedure
1. Dismantle the pipes from the vacuum and fore-vacuum connections.
2. Clean the suction chamber and the overflow channel with suitable brushes and cleaning agents.
3. After cleaning, completely remove remaining fluids using absorbent materials, and dry the suction
chamber.
4. After cleaning, mount all pipes.
5. Screw in the drain screws.
Maintenance
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