8. Servicing and maintaining the
product
8.1 Safety instructions and requirements
DANGER
Pump can tilt
Death or serious personal injury
‐ During maintenance and service, in-
cluding transport to service workshop,
always support the pump by lifting
chains or place it in horizontal position
to secure stability.
DANGER
Electric shock
Death or serious personal injury
‐ Before starting work on the pump,
make sure that the main switch is
locked in position 0. Make sure that the
power supply cannot be switched on
unintentionally.
WARNING
Crushing hazard
Death or serious personal injury
‐ Make sure that all rotating parts have
stopped moving.
Maintenance and service must be carried
out by trained persons.
Compliance with the standards IEC
60079-17 and IEC 60079-19 is a customer
responsibility.
Maintenance and service work on explo-
sion-proof pumps must be carried out by
Grundfos or an authorised service work-
shop.
In case of repairs, always use original
service parts from the manufacturer to en-
sure the correct dimensions of the flame
path gaps.
The bolts used in the motor must be class
A4-80 or A2-80 according to EN/ISO
3506-1. VER 2.
A defective bearing may reduce the Ex
safety.
WARNING
Chemical hazard
Death or serious personal injury
‐ Flush the pump thoroughly with clean
water before carrying out maintenance
and service. Rinse the pump parts af-
ter dismantling.
Service instructions and videos can be
found in Grundfos Product Center at
www.grundfos.com.
8.2 Maintenance schedule
Inspect pumps running normal operation once a year.
Check the following:
• Power consumption
• Oil level and oil condition
• Cable entries Make sure the cable entries are
waterproof, the cables are not sharply bent or
pinched, and the cable sheaths have no visual
defects.
• Impeller clearance
• Pump parts Check the pump parts for possible
wear. Replace defective parts.
• Ball bearings Check the shaft for noisy or heavy
operation; turn the shaft by hand. Replace
defective bearings. A general overhaul of the
pump is required in case of defective bearings or
poor motor function. This work must be carried out
by an authorised service workshop. Bearings are
lubricated for lifetime.
• Vibration If the pump is vibrating at an abnormal
level, do not restart the pump until the cause of
the fault is identified and eliminated.
Vibration may cause excessive tempera-
ture at dry-installed pumps.
The WIO sensor must also be checked
during the oil change or at least once a
year.
WIO sensor check
During the test, the WIO sensor must stay in place. If
the sensor does not work correctly, it must be
replaced.
Do not disassemble the sensor and do not
remove it from the oil chamber.
To test the sensor, measure the current flowing
through it and compare the values to the table below.
33
English (GB)
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