Maintenance Schedule; Power Consumption; Oil Check And Change - Grundfos S2 Série Mode D'emploi

10.2 Maintenance schedule

Inspect pumps running normal operation once a year.
Check the following points:
•

Power consumption

• Oil level and condition
• Cable entries Make sure that the cable entries are waterproof,
the cables are not sharply bent or pinched, and that 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 authorized service workshop. Bearings are lubricated for
a lifetime.
WIO sensor check
During the test, the WIO sensor must stay in place. If the sensor
does not work correctly, it must be replaced.
The WIO sensor must also be checked during the oil
FM
change, or at least once a year.
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.
Value Explanation
Cable break/Sensor
0 mA
fault
No oil in the oil
3.8 mA
chamber
4-10 mA Normal operation
Water in oil, possible
>10 mA
leakage

10.3 Oil check and change

The oil chamber is filled with oil acting as lubricant and coolant for
both mechanical seals.
Check the oil once a year to avoid damage and
breakdown of the pump.
Low oil level may indicate that the upper mechanical shaft seal is
defective. Contact an authorized service workshop for further
overhaul of the pump and repair, if required.
Lack of oil may cause overheating and damage to the
mechanical seals. The WIO sensor in the oil chamber trips
the alarm if the oil quality or quantity is inadequate in the
oil chamber.
Use oil with viscosity grade SAE 10W-30 or SAE 10W-40.
Measurement evaluation
Change the WIO sensor.
Perform the test when the oil
chamber is empty.
Perform the test when the oil
chamber is full.
Check the seals for possible
leakage.
Installation type
Range
S
[gal (liters)]
72 6.6 (25)
74 -
78 -
The oil in the oil chamber can be changed with the pump in either
horizontal or vertical position. Carry out the oil change with the
pump in horizontal position, if possible, so it is easier to drain all the
used oil out of the chamber.
Horizontal position
Proceed as follows:
1. Place the pump, so that the inspection screw A is pointing
upwards.
A
C
Pump with inspection screw A upwards
CAUTION
Pressurised system
Minor or moderate personal injury
‐
The oil chamber may be under pressure. Loosen
the crews carefully and do not remove them until
the pressure has been completely relieved.
2. Loosen and remove screw A.
3. Remove screw B and check the oil level.
4. Take an oil sample to inspect the condition of the oil. If it
contains water, the oil becomes greyish white. Usually, a small
leakage through the mechanical shaft seals is normal, but if the
water content in the oil is high, this may be the result of a
defective shaft seal. Change the oil if it contains water. Oil not
containing water can be reused.
5. If the oil needs to be changed, place a clean container under the
pump to collect all the drained-off oil.
6. Remove screw C and allow all the oil to drain from the chamber
into the container. Emulsified oil must be changed and disposed
of.
Used oil must be disposed of in accordance with local
regulations.
Oil quantity
C and D ST
[gal (liters)] [gal (liters)]
4.9 (18.5) 6.6 (25)
5.3 (20) 6.6 (25)
21.1 (80) 21.1 (80)
B
25