Adjusting The Impeller Clearance; Cleaning The Pump Housing; Checking/Replacing The Shaft Seal - Grundfos SLV.65 AUTOADAPT Installation And Operating Instructions Manual

8.6 Adjusting the impeller clearance

The SLV pumps (SuperVortex) with semi-open
impeller do not need impeller adjustment.
SL1 pumps
For position numbers in brackets, see figs
Appendix.
Proceed as follows:
1. Loosen the locking screws (188b).
2. Loosen the adjusting screws (189), and push the
wear plate (162) until it touches the impeller.
3. Tighten the adjusting screws so that the wear
plate still touches the impeller. Then loosen all
the adjusting screws about half a turn.
Make sure the impeller can rotate freely
without touching the wear plate.
4. Tighten the locking screws.
5. Rotate the impeller by hand to check that it is not
touching the wear plate.
See also section 8.7 Cleaning the pump
Fig. 15 Pump viewed from inlet side

8.7 Cleaning the pump housing

For position numbers in brackets, see figs
Appendix.
Proceed as follows:
Dismantling
1. Loosen and remove the clamp (92) fastening the
pump housing to the motor.
2. Lift the motor part out of the pump housing (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 (92).
See also section 8.8 Checking/replacing the shaft
seal.

8.8 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
3 and 4 in
seal is not replaced, the motor will be damaged.
If the oil is clean, it can be reused. See also section
8. Servicing and maintaining the
For position numbers, see figs
Proceed as follows:
1. Loosen and remove the clamp (92) fastening the
pump housing to the motor.
2. Lift the motor part out of the pump housing (50).
As the impeller is fastened to the shaft end, the
impeller will be removed together with the motor
part.
3. Remove the screw (188a) from the shaft end.
4. Remove the impeller (49) from the shaft.
5. Drain the oil from the oil chamber. See section
8.4 Oil check and oil
complete unit for all pumps.
housing.
6. Remove the screws (188a) securing the shaft
seal (105).
7. Lift the shaft seal (105) out of the oil chamber
using the lever principle, the two dismounting
holes in the shaft seal carrier (58) and two
screwdrivers.
8. Check the condition of the bush (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.
If the bush is intact, proceed as follows:
1. Check and clean the oil chamber.
2. Lubricate the faces in contact with the shaft seal
with oil.
3. Insert the new shaft seal (105) using the plastic
3 and 4 in
bush included in the kit.
4. Tighten the screws (188a) securing the shaft seal
to 16 Nm.
5. Fit the impeller. Make sure that the key (9a) is
fitted correctly.
6. Fit and tighten the screw (188a) securing the
impeller to 22 Nm.
7. Fit the pump housing (50).
8. Fit and tighten the clamp (92).
9. Fill the oil chamber with oil. See section
check and oil
For adjustment of the impeller clearance, see section
8.6 Adjusting the impeller
product.
3 and 4 in Appendix.
change. The shaft seal is a
change.
clearance.
8.4 Oil
21