Problem
Possible causes
Remedy
Unusual noises dur-
ing operation
● Suction chamber dirty
● Switch off the vacuum pump immedi-
ately.
● Clean suction chamber.
● Damage to the bearing or
gear wheels
● Switch off the vacuum pump immedi-
ately.
● Contact Pfeiffer Vacuum Service.
● Overflow valve soiled
● Switch off the vacuum pump immedi-
ately.
● Clean the overflow valve.
● Damage to motor bearing
● Switch off the vacuum pump immedi-
ately.
● Change the motor.
● If necessary, contact Pfeiffer Vacuum
Service.
Only applies to vacuum
pumps with magnetic cou-
pling
● Motor is running – vacuum
pump is not working, i.e.,
the magnetic coupling is
defective or the magnetic
field has broken down.
If the vacuum pump contin-
ues to run with a "broken
down" magnetic field, the
magnetic coupling is de-
stroyed by demagnetiza-
tion.
● Switch off the vacuum pump immedi-
ately and wait for it to come to a com-
plete standstill.
While the vacuum pump is at a stand-
still, the magnets can realign with
each other.
● Slowly restart the vacuum pump and
check the power transmission and
vacuum pressure.
Vacuum pump losing
oil
● A decreasing oil level in the
oiler and an oil leak below
the lantern indicate a de-
fective
external
radial shaft
seal ring.
● Check the level at shorter intervals
and top up regularly as required.
● You can continue to operate the roots
pump for a time.
● A decreasing oil level, with
no leaked oil visible below
the roots pump, is due to a
worn
inner
radial shaft seal
ring.
This damage leads to an inadmissibly
high oil level in the bearing chamber.
● Contact Pfeiffer Vacuum Service to
arrange for replacement of the protec-
tive sleeve and all three radial shaft
seal rings.
Tbl. 6:
Troubleshooting
Malfunctions
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