Maintenance And Service - Grundfos SL Instructions Manual

9. Maintenance and service

DANGER
Electric shock
Death or serious personal injury
‐
Before starting any work on the product, make sure that the power supply is switched off and it
cannot be switched on unintentionally.
CAUTION
Crushing hazard
Minor or moderate personal injury
‐
Make sure the pump cannot roll or fall over.
DANGER
Electric shock
Death or serious personal injury
‐
Make sure the pump is grounded.
CAUTION
Sharp element
Minor or moderate personal injury
‐
Be careful of sharp edges. Wear protective gloves.
Maintenance and service must be carried out by qualified persons.
Before carrying out maintenance and service, make sure that the pump is thoroughly flushed with clean water.
Rinse the pump parts after dismantling.
Change the motor liquid once a year or after 3.000 operating hours to prevent oxidation.
Normal leakage rate for the shaft seal is 2.000 ml / 12.000 operating hours. If more than 5.000 ml
fluid can be drained from the leakage chamber, the shaft seal must be replaced.
Frequency converter use may reduce the lifespan of the bearings and the shaft seal, depending on
the operating mode and other circumstances.
Pumps running normal operation must be inspected every 12.000 operating hours or at least once in 3 years.
Check the following:
• Power consumption
• Motor liquid level.
When the pump is new or after replacement of the shaft seals, check the motor liquid level and its water content
after one week of operation. If the motor liquid level has dropped, the shaft seal may be defective.
Disposal of the motor liquid must comply with local regulations.
• Cable entries: Make sure that the cable entries are waterproof and the cables are not sharply bent or
pinched.
• Impeller clearance: Check the impeller clearance.
• Pump parts: Check the pump housing and other parts for possible wear. Replace defective parts.
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