Oil Check And Oil Change - Grundfos S Series Service Instructions Manual

8.5 Oil check and oil change

The oil chamber is filled with oil acting as lubricant and coolant for
both mechanical seals.
A low oil level may indicate that the upper mechanical shaft seal
is defective. Contact an authorised 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
chamber will trip the alarm if the oil quality is poor or
there is no oil in the oil chamber.
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.
Horizontal position
Proceed as follows:
1. Place the pump in such a position that screw A is pointing
upwards.
Pump with oil plugs
Fig. 8
2. Place a clean container under the pump to collect all the
drained-off oil. Remove the screw B and observe the oil level.
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.
12
3. Check the oil level and 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.
4. If the oil needs to be changed, 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.
5. 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.
Upright position
Proceed as follows:
1. Identify the screws A, B and C and their positions relative to
each other. See fig. 8.
A
Correct oil level of upright position
Fig. 9
2. Use screw B for indication of the level of oil in the oil chamber.
See fig. 9.
3. When the pump is upright, the oil has to be pumped out of the
oil chamber. Use a suction pump with a flexible suction hose
that can be inserted deeply into the oil chamber.
4. Pump out the oil using all the screw holes in turns so as to
reach all sections of the interior of the oil chamber. Collect the
drained oil in a clean container.
5. 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.
B