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•
Stator housing
See section
9.2.4 Checking the stator housing
.
•
Cable entry
Make sure that the cable entry is waterproof, that
the cables are not sharply bent or pinched, and
that the cable sheaths have no visual defects.
See section
9.2.5 Checking the cable entry
•
Insulation resistance
See section
•
Pipes
Make sure that the pipes, valves and other
peripheral equipment are intact.
•
Pump parts
Check the inlet and outlet casing, etc. for
possible wear. Replace defective parts.
•
Ball bearings
Check the shaft for noisy or heavy operation by
turning the shaft by hand. Replace 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
an authorised service workshop.
9.2.1 Visual checks
Visual inspection of the pump must include the
following points:
•
Search for cracks or other external damage.
•
Check the lifting bracket or lifting eyes and the
lifting chain for wear and corrosion.
•
Inspect the power cables for cracks or
lacerations in the sheath, for kinks or for other
damage.
•
Check that the cables are firmly connected to the
motor top cover.
•
Check that no visible screws have self-loosened
and tighten if necessary.
9.2.2 Inspecting and adjusting the propeller or
impeller clearance
When the clearance between the propeller or
impeller blade and the wear ring exceeds 2 mm,
replace the wear ring.
If you have any questions, please contact Grundfos
or the nearest authorised service workshop.
KPL and KWM: replacing the wear ring
1. Remove the screws and lift the pump off the inlet
casing.
2. Replace the wear ring.
3. Assemble the pump in reverse order.
9.2.3 Checking and changing the oil
Check the oil level after one month of operation if the
pump is new or the shaft seals have been replaced.
The oil must be changed if it contains water.
Pump out all the used oil. After refilling, tighten the
oil plug to torque (80 Nm).
Faults must be repaired and notified to the
supervisor.
We recommend that you inspect the pump
after one week of operation when the
pump is new or the shaft seals have been
replaced.
Regular inspection and preventive
maintenance will ensure a more reliable
operation.
If the pump is fitted with a WIO sensor, you
do not need to check the oil level manually.
CAUTION
Pressurised system
Minor or moderate personal injury
- When loosening the screw of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screw until the pressure has been
fully relieved.
- Cover the screw with a rag to avoid
spillage.
Used oil must be disposed of in
accordance with local regulations.
Grundfos offers an oil change kit
(98887554) to ease the oil change.
See separate instructions for the oil
change kit on Grundfos Product Center.
