Worn coupling element
Replace the coupling element
Stuck vanes
Repair the vacuum pump (Busch service)
Use only recommended oils (
Ú
page 18:
Oil)
and change more frequently
The vacuum pump runs very hot
(the oil sump temperature shall not exceed
100 °C)
Insufficient air ventilation
Make sure that the cooling of the vacuum
pump is not impeded by dust/dirt
Clean the fan cowling, the fan wheel, the ven-
tilation grille and the cooling fins
Install the vacuum pump in a narrow space
only if sufficient ventilation is ensured
On a vacuum pump with oil-cooler: clean the
intermediate spaces of the finned tube
Ambient temperature too high
Observe the permitted ambient temperatures
Temperature of the inlet gas too high
Observe the permitted temperatures for the
inlet gas
The exhaust filter is partially clogged
Replace the exhaust filter
Not enough oil in the reservoir
Top up oil
Oil burnt from overheating
Flush the vacuum pump
Replace the exhaust filter
Fill in new oil
(
Ú
page 9: Maintenance)
In case the oil life is too short: use oil with
better heat resistance (
Ú
p
age 18: O
il) or ret-
rofit cooling
Mains frequency or voltage outside tolerance
range
Provide a more stable power supply
Partial clogging of filters or screens
Partial clogging in the suction, discharge or
pressure line
Remove the clogging
Long suction, discharge or pressure line with
too small diameter
Use larger diameter
The vacuum pump fumes or expels oil drop-
lets through the gas discharge
The oil level drops
The exhaust filter is not properly seated
Check the proper position of the exhaust fil-
ter, if necessary insert properly
(
Ú
page 9: Maintenance)
The o-ring is missing or damaged
Add or replace resp. the o-ring
(
Ú
page 9: Maintenance)
The exhaust filter shows cracks
Replace the exhaust filter
(
Ú
page 9: Maintenance)
The exhaust filter is clogged with foreign mat-
ter
Note
: The saturation of the exhaust filter with
oil is no fault and does not impair the function
of the exhaust filter! Oil dropping down from
the exhaust filter is returned to the oil circula-
tion.
Replace the exhaust filter
(
Ú
page 9: Maintenance)
Version with oil return valve (RA ... C,
0.5 mbar):
In case the vacuum pump runs for more than
2 hours without interruption, oil can collect in
the upper chamber of the oil separator (e) to
an extent that it gets expelled together with
the discharged gas
Regularly shut down the vacuum pump for
short periods of time. Check that the oil return
valve functions properly and lets oil run from
the upper into the bottom chamber of the oil
separator (e) as soon as the vacuum pump is
shut down (
Ú
page 3: Oil Circulation)
16
