Replacing The Grinder System; Cleaning The Pump Housing - Grundfos SEG AUTOADAPT Montage- Und Betriebsanleitung

12.4 Replacing the grinder system

Warning
Before starting work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched off. It must be ensured that
the power supply cannot be
accidentally switched on.
All rotating parts must have stopped
moving.
For position numbers, see page 588.
Removing the grinder system:
1. Slacken the screw (pos. 188a) in one of the pump
feet.
2. Loosen the grinder ring (pos. 44), and open the
bayonet socket by knocking the grinder ring
clockwise.
Fig. 12 Removal of grinder ring
3. Remove the grinder ring (pos. 44).
4. Remove the screw from the shaft end.
5. Remove the grinder head (pos. 45).
For adjustment of impeller clearance, see fig. 13.
a) Gently tighten the nut (pos. 68) (spanner size 24)
until the impeller (pos. 49) cannot rotate any
more.
b) Slacken the nut by 1/4 turn.
Fig. 13 Adjustment of impeller clearance
Fitting the grinder system:
1. When fitting the 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 the screw (pos. 188a) for the grinder
head to 20 Nm.
3. Engage the bayonet socket for the grinder ring
(pos. 44).
4. Knock the bayonet socket counter-clockwise until
the grinder ring (pos. 44) is fastened.
5. Tighten the screw (pos. 188a).
6. Turn the grinder head to make sure that it is fitted
correctly, i.e. it turns freely.

12.5 Cleaning the pump housing

For position numbers, see page 588.
To clean the pump housing, 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). The impeller and grinder head are
removed together with the motor part.
3. Clean the pump housing and the impeller.
Assembly
1. Place the motor part with impeller and grinder
head in the pump housing.
2. Fit and tighten the clamp.
See also section 12.7 Checking/replacing the shaft
seal.
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