Maintenance Schedule; Power Consumption; Cable Entries; Oil Check And Oil Change - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

9.2 Maintenance schedule

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

Power consumption

• Oil level and oil condition
See section
9.3 Oil check and oil
•

Cable entries

Make sure that the cable entries are waterproof, that the
cables are not sharply bent or pinched, and that the cable
sheaths have no visual defects.
• Impeller clearance
Check the impeller clearance. See section
adjustment of impeller clearance.
• Pump parts
Check the pump housing, etc. 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.

9.3 Oil check and oil 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 of
the mechanical seals. The WIO sensor in the oil
FM
chamber will trip the alarm if the oil quality is poor or
there is not enough oil in the oil chamber.
Use oil with viscosity grade SAE 10 W 40.
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 upright position. We recommend that you carry out
the oil change with the pump in horizontal position, if possible,
because in that way it is much easier to drain all the used oil out
of the chamber.
change.
9.4 Inspection and
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)
Horizontal position
Proceed as follows:
1. Place the pump in such a position that inspection screw A is
pointing upwards.
Fig. 33 Pump with inspection screw A upwards
CAUTION
Pressurised system
Minor or moderate personal injury
- When loosening the screws 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.
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. The oil
becomes greyish white like milk if it contains water. In normal
operation a small leakage through the mechanical shaft seals
is expected to happen, 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.
7. Replace the O-rings, refit screw C and tighten securely. Fill
the oil chamber with oil to the correct level. Refit screws A and
B and tighten securely.
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