Cleaning The Pump Housing; Checking/Replacing The Shaft Seal - Grundfos SEG Instrucciones De Instalación Y Mantenimiento

Assembly
1. When fitting grinder head (pos. 45), the
projections on the back of the grinder head must
engage with the holes in the impeller (pos. 49).
2. Tighten screw (pos. 188a) in the shaft end to
20 Nm. Do not forget the lock washer.
3. Fit grinder ring (pos. 44).
4. Turn grinder ring (pos. 44) 15 to 20 ° anti-
clockwise until it is tightened.
5. Check that the grinder ring does not touch the
grinder head.
6. Tighten screw (pos. 188a) to 16 Nm.
7. Check that the grinder head rotates freely and
noiselessly.

10.3 Cleaning the pump housing

For position numbers, see page 592.
1. Remove clamp (pos. 92).
2. Lift the motor part out of pump housing (pos. 50).
The impeller and grinder head are removed
together with the motor part.
3. Clean the pump housing and the impeller.
4. Place the motor part with impeller and grinder
head in the pump housing.
5. Fit and tighten the clamp (pos. 92).
See also section 10.4 Checking/replacing the shaft
seal.

10.4 Checking/replacing the shaft seal

The shaft seal is a complete unit for all SEG pumps.
To make sure that the shaft seal is intact, the oil
should be checked.
If the oil contains more than 20 % water, it is an
indication that the shaft seal is defective and must be
replaced. If the shaft seal is still used, the motor will
be damaged.
If the oil is clean, it can be reused. See also section
10. Maintenance and service.
For position numbers, see page 592.
To check the shaft seal, proceed as follows:
1. Remove grinder ring (pos. 44).
See section 10.2 Replacing the grinder
2. Remove screw (pos. 188a) from the shaft end.
3. Loosen and remove clamp (pos. 92).
4. Lift the motor part out of pump housing (pos. 50).
The impeller and grinder head are removed
together with the motor part.
5. Remove grinder head (pos. 45).
6. Remove impeller (pos. 49) from the shaft.
7. Drain the oil from the oil chamber.
See section 10.5 Oil
Used oil must be disposed of in
Note
accordance with local regulations.
22
system.
change.
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.
8. Remove screws (pos. 188a) securing shaft seal
(pos. 105).
9. Lift shaft seal (pos. 105) out of the oil chamber
according to the lever principle using the two
dismounting holes in 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. Bush (pos. 103) on the shaft must be
intact. If the bush 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 new shaft seal (pos. 105) using the plastic
bush included in the kit.
4. Tighten screws (pos. 188a) securing the shaft
seal to 16 Nm.
5. Fit the impeller. Make sure that key (pos. 9a) is
fitted correctly.
6. Fit pump housing (pos. 50).
7. Fit and tighten clamp (pos. 92).
8. Fill the oil chamber with oil.
For adjustment of impeller clearance, see section
10.2 Replacing the grinder system.