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.
8.2 Maintenance schedule
Inspect pumps running normal operation once a year.
Check the following:
•
Power consumption
•
WIO sensor
•
Oil level and oil condition
•
Cable entries
Make sure that 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 usually 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 a 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 can 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 or remove
it from the oil chamber.
To test the sensor, measure the current flowing
through it and compare the values to the table below.
Value
Explanation
Measurement evalu-
ation
0 mA
Cable break /
Sensor fault
Change the WIO sen-
sor.
3.8 mA
No oil in the oil
chamber
Perform the test when
the oil chamber is
empty.
4-10 mA
Normal opera-
tion
Perform the test when
the oil chamber is full.
> 10 mA
Water in oil, pos-
sible leakage
Check the seals for
possible leakage.
8.3 Oil check and change
The oil chamber is filled with oil acting as lubricant
and coolant for both mechanical seals.
Check the oil every 3000 operating hours
or at least once a year, or after the shaft
seal is changed.
Oil auto-ignition temperature must be
above 250 °C. Use any of the following:
•
Elf Performance Polytraffic 10W-40
•
Total Rubia Polytraffic 10W-40
•
Pennzoil SAE 10W-40.
Low oil level may indicate that the upper mechanical
shaft seal is defective. Contact an authorised service
workshop for further maintenance and repair, if
required.
Lack of oil may cause overheating and
damage to the mechanical shaft seals.
The WIO sensor in the oil chamber trips
the alarm if the oil quality or quantity is in-
sufficient in the oil chamber.
Range
Oil quantity
Installation type
S
[litres]
C and D
[litres]
ST
[litres]
72
25
18.5
25
74
-
20
25
78
-
80
80
The oil in the oil chamber can be changed when the
pump is either in a horizontal or vertical position. It is
recommended, however; to carry out the oil change
when the pump is in a horizontal position as it is
much easier to drain all the used oil from the
chamber.
33
English (GB)
Summary of Contents for ST-55-520
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