Cleaning The Pump Housing; Cleaning The Sensors; Checking/Replacing The Shaft Seal - Grundfos AUTOADAPT SL1 Serie Instrucciones De Instalación Y Funcionamiento

11.5 Cleaning the pump housing

For position numbers, see page
Proceed as follows:
Dismantling
1. Loosen and remove the clamp (pos. 92) holding
the pump housing and motor together.
2. Lift the motor part out of the pump housing (pos.
50). As the impeller is fastened to the shaft end,
the impeller will be removed together with the
motor part.
3. Clean the pump housing and the impeller.
Assembly
1. Place the motor part with impeller in the pump
housing.
2. Fit and tighten the clamp.
See also section 11.7 Checking/replacing the shaft
seal.

11.6 Cleaning the sensors

Fig. 15 Position of level and dry-running
sensors
Proceed as follows:
See fig. 15.
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
Caution other cleaning aids than those mentioned
above.
If the dry-running sensors are not covered
Note
by liquid, the pump cannot start.
20
550 or 551.

11.7 Checking/replacing the shaft seal

To make sure that the shaft seal is intact, check the
oil.
If the oil contains more than 20 % water, the shaft
seal is defective and must be replaced. If the shaft
seal is not replaced, the motor will be damaged.
If the oil is clean, it can be reused. See also section
11. Maintenance and service.
For position numbers, see page
Proceed as follows:
1. Loosen and remove the clamp (pos. 92) holding
the pump housing and motor together.
2. Lift the motor part out of the pump housing (pos.
50). As the impeller is fastened to the shaft end,
the impeller will be removed together with the
motor part.
3. Remove the screw (pos. 188a) from the shaft
end.
4. Remove the impeller (pos. 49) from the shaft.
5. Drain the oil from the oil chamber. See section
11.8 Oil change.
Used oil must be disposed of in
Note
accordance with local regulations.
Warning
When loosening 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.
6. Remove the screws (pos. 188a) securing the
shaft seal (pos. 105).
7. 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.
8. Check the condition of the bush (pos. 103) where
the secondary seal of the shaft seal touches the
bush. The bush must be intact. If the bush is
worn and must be replaced, the pump must be
checked by Grundfos or a service workshop
authorised by Grundfos.
550 or 551.