En
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22
Maintenance
Pumps running normal operation must be inspected
every 3000 operating hours or at least once a year. If
the pumped liquid is muddy or sandy, inspect the
pump at shorter intervals.
Check the following:
•
Power consumption
See on the 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.
•
Cable entry
Make sure that the cable entry is watertight and
the cable is not sharply bent or pinched.
•
Pump parts
Check the pump parts for possible wear. Replace
the defective parts.
•
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 an authorised service workshop.
Bearings are lubricated for lifetime.
Dismantling the pump
Oil change
CAUTION
Crushing hazard
Minor or moderate
personal injury
- Make sure that the
lifting bracket is
tightened before lifting
the pump. Always lift
the pump by its lifting
bracket or by a forklift
truck, if the pump is
fixed on a pallet. Never
lift the pump by the
power cable, hose or
pipe.
Defective bearings may reduce the Ex
safety.
Pumps running normal operation must be
inspected every 3000 operating hours or at
least once a year. If the pumped liquid is
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- and 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.
Inspect the oil level 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.
CAUTION
Pressurised system
Minor or moderate
personal injury
- The oil chamber may
be under pressure.
Loosen the screws
carefully and do not
remove them until the
pressure has been fully
relieved.
Used oil must be
disposed of in
accordance with local
regulations.
