En
gl
is
h (
G
B)
18
10.3 Cleaning the pump housing
For position numbers in brackets, see page
Proceed as follows:
Dismantling
1. Stand the pump upright.
2. Loosen and remove the clamp (92) joining pump
housing and motor.
3. 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.
4. 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.
See also section
10.4 Checking or replacing the
10.4 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
For position numbers, see page 34, 35 or 36.
Proceed as follows:
1. Loosen and remove the clamp (92) holding the
pump housing and the motor together.
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
. 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
For adjustment of impeller clearance, see section
