7 Maintenance
7.1 Maintenance information
WARNING
Health hazard through poisoning from toxic contaminated components or devices
Toxic process media result in contamination of devices or parts of them. During maintenance work,
there is a risk to health from contact with these poisonous substances. Illegal disposal of toxic sub-
stances causes environmental damage.
► Take suitable safety precautions and prevent health hazards or environmental pollution by toxic
process media.
► Decontaminate affected parts before carrying out maintenance work.
► Wear protective equipment.
WARNING
Health hazard and environmental damage from toxic contaminated lubricant
Toxic process media can cause lubricant contamination. When changing the lubricant, there is a
health hazard due to contact with poisonous substances. Illegal disposal of toxic substances causes
environmental damage.
► Wear suitable personal protective equipment when handling these media.
► Dispose of the lubricant according to locally applicable regulations.
CAUTION
Danger of burns on hot surfaces
Depending on the operating and ambient conditions, the surface temperature of the vacuum pump
can increase to above 70 °C.
► Provide suitable touch protection.
NOTICE
Damage caused by unsuitable cleaning agents
Unsuitable cleaning agents damage the product.
► Do not use solvents as they attack the surface.
► Do not use any aggressive or abrasive cleaning agents.
Disassembly and cleaning
● When carrying out maintenance work, only dismantle the screw pump to the extent that
is necessary.
● Clean the pump parts using industrial alcohol, isopropanol or similar agents.
● Avoid residues of cleaning agent inside the screw pump.
Preparatory measures
1. Shut down the screw pump and allow the screw pump to cool as required.
2. Disconnect the motor from the mains.
3. Secure the motor against unintentional reactivation.
4. Close the cooling water feed.
5. Switch off the process- and pump-specific media supply (e.g. the sealing gas supply).
6. Vent the screw pump to atmospheric pressure via the vacuum side.
7. Allow the cooling water to drain completely.
8. Disconnect all connections.
9. Dismantle the screw pump from the system as necessary.
Maintenance
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