BUSCH COBRA NS 0070-0160 C, Installation And Maintenance Instructions Manual

Page: 14 / 24

Oil change
DANGER
In case the vacuum pump has conveyed gases that have been
contaminated with harmful foreign materials, the oil will also be
contaminated.
Danger to health during the change of contaminated oil.
Danger to the environment.
Wear protective equipment during the change of contaminated oil.
Contaminated oil is hazardous waste and must be disposed of
separately in compliance with applicable regulations.
Draining used oil
NOTE : After switching off the vacuum pump at normal operating
temperature 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
l Put a drain tray underneath the oil drain plugs (ODP)
l
Remove the oil drain plugs (ODP)
l Carefully remove the drain plugs
l Drain the oil
l Because of wear and tear on the seals replace the current drain
plugs with new ones
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.
Filling in new oil
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 middle of the oil sight glass.
l Make sure that the oil level lies between the MIN and MAX
markings on the oil sight glasses.
l Make sure that the seals of the filler cap are not damaged and that
they sit properly. Replace them if necessary.
l Screw on the filler cap again.
Checking the cooling liquid
Checking the level of the cooling liquid
l Make sure that the vacuum pump has been switched off and that
it cannot be switched on again accidentally.
l Check the level of the cooling liquid with the measuring scale
located under the filler (CLF) or with a ruler.
The level of the cooling liquid in the expansion vessel (EV) may never
exceed 5 mm seen from the bottom of the vessel.
If the level does not reach the MIN marking:
u Top up with cooling liquid (see “Refilling cooling liquid”).
If the level exceeds the MAX marking:
u Drain the cooling liquid (see “Draining the cooling liquid”).
Refilling cooling liquid
NOTE : Cooling liquid does not normally have to be refilled outside the
recommended change intervals. A drop in the level of the liquid
indicates a malfunction (see “Troubleshooting”).
l Make sure that the vacuum pump has been switched off and that
it cannot be switched on again accidentally.
l Unscrew the filler cap for the cooling liquid.
Filling in cooling liquid
l
Prepare the quantity of cooling liquid needed (see “Cooling liquid
type/ quantity”).
NOTE : The quantity of cooling liquid specified is of informative nature
only. Check the level of the cooling liquid at the liquid level indicator
located under the filler (CLF) or with a measuring scale.
l Make sure that the drain plug sits properly and does not leak.
l
Unscrew the filler cap (CLF) on the expansion vessel.
l Fill in cooling liquid.
l Make sure that the level of the cooling liquid lies between the MIN
and MAX markings of the liquid level indicator.
l Make sure that the seals of the filler cap are not damaged and that
they sit properly. Replace them if necessary.
l Screw on the filler cap (CLF) again.
Draining the cooling liquid
l Make sure that the vacuum pump has been switched off and that
it cannot be switched on again accidentally.
l Place a container under the drain plug (CLD).
l
Unscrew the drain plug (CLD).
l Drain the cooling liquid.
When cooling liquid stops running out:
Maintenance
NS 0070-0160 C
Page 14
0870570353 (En)
Filler cap
Max