Cleaning The Sensors; Checking/Replacing The Shaft Seal - Grundfos SEG AUTOADAPT Montage- Und Betriebsanleitung

12.6 Cleaning the sensors

Fig. 14 Position of level and dry-running sensors
Proceed as follows:
See fig. 14.
1. Level sensor (pos. 7):
Flush the sensor with clean water.
Dry-running sensors (pos. 10):
Flush the dry-running sensors with clean water
and clean using a soft brush.
2. Switch on the power supply to the pump.
3. Check that the pump starts and pumps down to
the dry-running level.
To avoid damaging the sensors, do not
use other cleaning aid than those
Caution
mentioned above.
If the dry-running sensors are not
covered by liquid, the pump cannot
Note
start.

12.7 Checking/replacing the shaft seal

To make sure that the shaft seal is intact, the oil
should be checked.
If the oil contains more than 20 % water, the shaft
seal may be defective and must be replaced. If the
shaft seal is nevertheless used, the motor will be
damaged.
If the oil is clean, it can be reused. See also section
12. Maintenance and service.
For position numbers, see page 588.
24
To check the shaft seal, proceed as follows:
1. Remove the grinder ring (pos. 44).
See section 12.4 Replacing the grinder system.
2. Remove the screw (pos. 188a) from the shaft
end.
3. Loosen and remove the clamp (pos. 92) holding
the pump housing and motor together.
4. Lift the motor part out of the pump housing
(pos. 50). The impeller and grinder head are
removed together with the motor part.
5. Remove the grinder head (pos. 45).
6. Remove the impeller (pos. 49) from the shaft.
7. Drain the oil from the oil chamber.
See section 12.8 Oil change.
Used oil must be disposed of in
Note
accordance with local regulations.
Warning
When slackening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove
the screws until the pressure has been
fully relieved.
The shaft seal is a complete unit for all pumps.
8. Remove the screws (pos. 188a) securing the
shaft seal (pos. 105).
9. Lift the shaft seal (pos. 105) out of the oil
chamber according to the lever principle using
the two dismounting holes in the shaft seal
carrier (pos. 58) and two screwdrivers.
10. Check the condition of the shaft where the
secondary seal of the shaft seal touches the
shaft. The bush (pos. 103) fitted to the shaft
must be intact. If it is worn and must be replaced,
the pump must be checked by Grundfos or
an authorised service workshop.
If the shaft is intact, proceed as follows:
1. Check/clean the oil chamber.
2. Lubricate the faces in contact with the shaft seal
with oil (pos. 105a) (O-rings and shaft).
3. Insert the new shaft seal (pos. 105) using the
plastic bush included in the kit.
4. Tighten the screws (pos. 188a) securing the shaft
seal to 16 Nm.
5. Fit the impeller. Make sure that the key (pos. 9a)
is fitted correctly.
6. Fit the pump housing (pos. 50).
7. Fit and tighten the clamp (pos. 92).
8. Fill the oil chamber with oil. See section 12.8 Oil
change.
For adjustment of impeller clearance, see section
12.4 Replacing the grinder system.