Checking the colour of the oil
NOTE
: The oil must be clear and transparent. A permanent milky co-
lour is an indication for contamination by foreign bodies. A dark colour
is an indication for oil that has been chemically altered or contaminated
by foreign bodies.
WARNING
Dark colored oil may indicate a hazardous pump condition which
could cause personal injury.
If dark oil similar to the example shown is observed, you have to
contact the Busch Customer Service without delay.
Oil change
DANGER
If the vacuum pump has pumped gases that were contaminated
with foreign bodies that are hazardous to health, the oil is also
contaminated with these foreign bodies.
There is a health hazard when changing contaminated oil.
There is also a danger to the environment.
Wear protective clothing when replacing contaminated oil.
Contaminated oil must be treated specially and must be disposed
of according to applicable regulations.
Draining used oil
NOTE
: After switching off the vacuum pump at normal operating tem-
perature wait no more than 20 minutes before the oil is drained.
l
Make sure that the vacuum pump is switched off and cannot
accidentally be switched on again
l
Make sure that the vacuum pump is vented to atmospheric
pressure
COBRA NS (DP) vacuum pump
l
Put a drain tray underneath the oil drain plugs (ODP)
l
Unscrew the oil drain plugs (ODP)
l
Carefully remove the drain plugs
l
Drain the oil
l
Because of wear and tear on the seal replace the current drain
plugs with new ones
When the oil flow has stopped:
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Close the oil drain plugs (ODP)
l
Switch on the vacuum pump for a few seconds
l
Make sure that the vacuum pump is switched off and cannot
accidentally be switched on again
l
Carefully remove the oil drain plugs again and drain any remaining
oil
l
Check that no metal swarf sticks to the magnet of the drain plug,
clean if necessary
l
Refit the oil drain plugs and tighten up
l
Dispose of the used oil in compliance with applicable regulations
CAUTION
Because the ends of the drain plugs are magnetic, metal swarf can
stick to them. Always clean away this swarf when removing the
drain plugs.
Because of wear and tear of the seals, it is recommended to replace
the drain plugs whenever the oil is changed.
WZ (MB) rotary lobes vacuum pump
l
Put a drain tray underneath the oil drain plugs (ODP)
l
Unscrew the oil drain plugs (ODP)
l
Drain the oil
When the oil flow has stopped:
l
Refit the oil drain plugs (ODP) again
l
Switch on the vacuum pump for a brief moment and let it run for a
few seconds
l
Make sure that the vacuum pump is switched off and cannot
accidentally be switched on again
l
Carefully remove the oil drain plugs again and drain any remaining
oil
l
Make sure that the seals of the drain plugs are not damaged and
that they sit properly. Replace them if necessary
l
Refit the oil drain plugs and tighten them up
l
Dispose of the used oil in compliance with applicable regulations
Filling in new oil
COBRA NS (DP) vacuum pump
l
Prepare the quantity of oil needed (see “Oil type/quantity”)
WARNING
The use of chemically contaminated or polluted oil can lead to
hazardous pump conditions which could cause personal injury.
NOTE
: The quantity of oil specified in the installation handbook is of
informative nature only. Check the oil level with the help of the various
oil sight glasses on the vacuum pump.
l
Make sure that the drain plugs have been fitted properly and that
they do not leak
CAUTION
Only fill in oil through the oil filler opening.
l
Unscrew the oil filler cap (OFP)
l
Fill in oil up to the top of the target circle of the oil sight glasses
Oil level, pump not operating
Maintenance
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