Grundfos SL1.50, Installation And Operating Instructions Manual

Page: 25 / 43

English (GB)
25
8.6 Cleaning the pump housing
For position numbers in brackets, see figs C and D in
Appendix .
Proceed as follows:
Dismantling
1. Stand the pump upright.
2. Loosen and remove the clamp (92) fastening the
pump housing to the motor.
3. Lift the motor out of the pump housing (50). As
the impeller is fastened to the shaft end, the
impeller will be removed together with the motor.
4. Clean the pump housing and the impeller.
Assembly
1. Place the motor with impeller in the pump
housing (50).
2. Fit and tighten the clamp.
See also section
8.7 Checking or replacing the shaft
seal .
8.7 Checking or 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
8. Servicing and maintaining the product .
For position numbers in brackets, see figs C and D in
Appendix .
Proceed as follows:
1. Loosen and remove the clamp (92) fastening the
pump housing to the motor.
2. Lift the motor out of the pump housing (50). As
the impeller is fastened to the shaft end, the
impeller will be removed together with the motor.
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
8.8 Service kits . The shaft seal is a complete unit
for all pumps.
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 using 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, continue 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
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. Place the motor with impeller in the pump
housing (50).
8. Fit and tighten the clamp (92).
9. Fill the oil chamber with oil. See section
8.8 Service kits .
For adjustment of the impeller clearance, see section
8.5 Adjusting the impeller clearance .