English (GB)
23
8.8 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 still used, 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 fig. D in
Appendix.
Proceed as follows:
1. Remove the grinder ring (44).
See section 8.6 Replacing the grinder system.
2. Remove the screw (188a) from the shaft end.
3. Loosen and remove the clamp (92) fastening the
pump housing to the motor.
4. Lift the motor out of the pump housing (50). As
the impeller and grinder head are fastened to the
shaft end, the impeller and the grinder head will
be removed together with the motor.
5. Remove the screw (188a) from the shaft end.
6. Remove the grinder head (45).
7. Remove the impeller (49) from the shaft.
8. Drain the oil from the oil chamber. See section
8.4 Oil check and oil change. The shaft seal is a
complete unit for all pumps.
9. Remove the screws (188a) securing the shaft
seal (105).
10. Lift the shaft seal (105) out of the oil chamber
using the lever principle using the two
dismounting holes in shaft seal carrier (58) and
two screwdrivers.
11. 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
bush included in the kit.
4. Tighten the screws (188a) securing the shaft seal
to 16 Nm.
5. Fit the impeller and the grinder head. Make sure
that the key (9a) is fitted correctly.
6. Place the motor with impeller and grinder head in
the pump housing (50).
7. Fit and tighten the clamp (92).
8. Fill the oil chamber with oil. See section 8.4 Oil
check and oil change.
For adjustment of the impeller clearance, see section
8.5 Adjusting the impeller clearance.
To Next Page
Loading...
Need help?
General
