Adjusting The Impeller Clearance; Replacing The Grinder System - Grundfos SEG AUTOADAPT Installation And Operating Instructions Manual

8.6 Adjusting the impeller clearance

For position numbers in brackets, see figs
Appendix.
Proceed as follows:
1. Gently tighten the adjusting nut (68) until the
impeller (49) cannot rotate any more. Use a
spanner size 24.
2. Loosen the adjusting nut by 1/4 turn.
Fig. 14 Adjusting the impeller clearance

8.7 Replacing the grinder system

CAUTION
Sharp element
Minor or moderate personal injury
- Do not touch the sharp edges of the
impeller, grinder head, and grinder ring
without wearing gloves.
During service the painted surface may be
damaged. Remember to restore the
painted surface by applying new paint.
For position numbers in brackets, see figs
Appendix.
Proceed as follows:
Dismantling
1. Loosen the screw (188a) in one of the pump feet.
4 and 5 in
2. Loosen the grinder ring (44), and open the
bayonet socket by knocking or turning the grinder
ring 15 to 20 ° clockwise. See fig. 15.
Fig. 15
3. Gently prise the grinder ring (44) out of the pump
housing with a screwdriver.
Make sure that the grinder ring does not
get stuck against the grinder head.
4. Insert a punch into the hole in the pump housing
to hold the impeller.
5. Remove the screw (188a) in the shaft end and
the locking ring (66).
6. Remove the grinder head (45).
Assembly
1. When fitting the grinder head (45), the
projections on the back of the grinder head must
4 and 5 in
engage with the holes in the impeller (49).
2. Tighten the screw (188a) for the grinder head to
20 Nm. Do not forget the lock washer.
3. Fit the grinder ring (44).
4. Turn the grinder ring (44) 15 to 20 ° counter-
clockwise until it is tightened.
5. Check that the grinder ring does not touch the
grinder head.
6. Tighten the screw (188a) to 16 Nm.
Make sure the impeller can rotate freely
and noiselessly.
Removing the grinder ring
21