The vacuum pump runs very noisily Defective bearings Repair the vacuum pump (Busch service)
Worn coupling element (310) Replace the coupling element (310)
Stuck vanes (r, 22) Repair the vacuum pump (Busch service)
Use only recommended oils (Ú 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 cowlings, the fan wheels, the
ventilation grilles 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 (p, 122) is partially clogged Replace the exhaust filter (p, 122)
The oil filter (h, 100) is clogged (the oil flows
through the bypass only, the oil does not get
filtered any more)
Replace the oil filter (h, 100)
(Ú Maintenance)
Not enough oil in the reservoir Top up oil
Oil burnt from overheating Flush the vacuum pump
Replace the oil filter (h, 100)
Replace the exhaust filter (p, 122)
Fill in new oil
(Ú Maintenance)
In case the oil life is too short: use oil with
better heat resistance (Ú Oil) or retrofit cool-
ing
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 (p, 122) is not properly
seated
Check the proper position of the exhaust filter
(p, 122), if necessary insert properly
(Ú Maintenance)
The o-ring is missing or damaged Add the o-ring
(Ú Maintenance)
The exhaust filter (p, 122) shows cracks Replace the exhaust filter (p, 122)
(Ú Maintenance)
The exhaust filter (p, 122) is clogged with for
-
eign matter
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 (p, 122)
(Ú Maintenance)
RA 0025 - 0040 F Troubleshooting
0870139077 / 051214 page 17
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