Grundfos DP AUTOADAPT Series, Installation And Operating Instructions Manual

Page: 21 / 50

English (GB)
21
8.6 Adjusting the impeller clearance
For position numbers in brackets, see figs 4 to 6 in
Appendix .
Proceed as follows:
DP pumps only
1. Loosen and remove the screws (188c) holding
the inlet strainer (84). Remove the strainer.
All pumps
2. Loosen the locking screws (188b).
3. Loosen the adjusting screws (189), and push the
wear plate (162) until it touches the impeller.
4. Tighten the adjusting screws so that the wear
plate still touches the impeller. Then loosen all
the adjusting screws about half a turn.
5. Tighten the locking screws.
6. Rotate the impeller by hand to check that it is not
touching the wear plate.
DP pumps only
7. Fit the inlet strainer. Fit and tighten the screws
(188c).
See also section 8.7 Cleaning the pump housing .
Fig. 16 Pump viewed from inlet side
8.7 Cleaning the pump housing
For position numbers in brackets, see figs 4 to 6 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.
2. Fit and tighten the clamp (92).
See also section
8.8 Checking or replacing the shaft
seal .
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 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 4 to 6 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 8.4 Oil check and oil change . 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, 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
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 part with impeller in the pump
housing (50).
8. Fit and tighten the clamp (92).
9. Fill the oil chamber with oil. See section
8.4 Oil
check and oil change .
For adjustment of the impeller clearance, see section
8.6 Adjusting the impeller clearance .
Make sure the impeller can rotate freely
without touching the wear plate.
TM
06
5
872
03
1
6