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10.1 Inspection
Pumps running normal operation must be inspected
every 3000 operating hours or at least once a year. If
the pumped liquid is very muddy or sandy, inspect
the pump at shorter intervals.
Check the following points:
• Power consumption
See pump nameplate.
• Oil level and oil condition
When the pump is new or after replacement of
the shaft seal, check the oil level and water
content after one week of operation. If there is
more than 20 % extra liquid (water) in the oil
chamber, the shaft seal is defective. The oil must
be changed after 3000 operating hours or once a
year.
Use Shell Ondina 919 oil or similar type
Ondina
X420 oil or equivalent type.
See section 10.2.1 Oil change.
• Cable entry
Make sure that the cable entry is watertight
(visual inspection) and that the cable is not
sharply bent and/or pinched.
• Pump parts
Check impeller, pump housing, etc. for possible
wear. Replace the defective parts.
See section 10.2.2 Removing the pump housing
and impeller.
• Ball bearings
Check the shaft for noisy or heavy operation (turn
the shaft by hand). Replace the defective ball
bearings.
A general overhaul of the pump is usually
required in case of defective ball bearings or poor
motor function. This work must be carried out by
Grundfos or a service workshop authorised by
Grundfos.
• O-rings and similar parts
During service and replacement, make sure that
the grooves for the O-rings as well as the seal
faces have been cleaned before the new parts
are fitted. Grease O-rings and recesses before
assembly.
Checking and changing the oil
Defective bearings may reduce the Ex
safety.
Pumps running normal operation should
be inspected every 3000 operating hours
or at least once a year. If the pumped
liquid is very muddy or sandy, inspect the
pump at shorter intervals.
Pumps with sensor offer the possibility of
constant monitoring key components in the
pump, such as shaft seal condition bearing
temperature, winding temperature,
insulation resistance and moisture in the
motor.
Check the shaft for noisy or heavy
operation (turn the shaft by hand).
Replace defective ball bearings.
Do not reuse rubber parts.
Explosion-proof pumps must be checked
by an authorised Ex workshop once a
year.
Use Shell Ondina X420 oil or similar type.
Inspect the oil level and condition every
3000 operating hours or at least once a
year.
When the pump is new or after
replacement of the shaft seal, check the oil
level and water content after one week of
operation.
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