Cleaning The Pump Housing; Checking/Replacing The Shaft Seal - Grundfos DP 10 Serie Montage- Und Betriebsanleitung

10.3 Cleaning the pump housing

For position numbers, see page 546, 547 or 548.
Proceed as follows:
Dismantling
1. Stand the pump upright.
2. Loosen and remove the clamp (pos. 92) joining
pump housing and motor.
3. Lift the motor part out of the pump housing (pos.
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/replacing the shaft
seal.

10.4 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
seal is not replaced, the motor will be damaged.
If the oil is clean, it can be reused. See also section
10. Maintenance and service.
For position numbers, see page 546, 547 or 548.
Proceed as follows:
1. Loosen and remove the clamp (pos. 92) holding
the pump housing and the motor together.
2. Lift the motor part out of the pump housing (pos.
50). As the impeller is fastened to the shaft end,
the impeller will be removed together with the
motor part.
3. Remove the screw (pos. 188a) from the shaft
end.
4. Remove the impeller (pos. 49) from the shaft.
5. Drain the oil from the oil chamber. See section
10.5 Oil change.
Used oil must be disposed of in
Note
accordance with local regulations.
Warning
When loosening the screws of the oil
chamber, note that pressure may have
built up in the chamber. Do not remove the
screws until the pressure has been fully
relieved.
The shaft seal is a complete unit for all pumps.
6. Remove the screws (pos. 188a) securing the
shaft seal (pos. 105).
7. Lift the shaft seal (pos. 105) out of the oil
chamber using the lever principle, the two
dismounting holes in the shaft seal carrier (pos.
58) and two screwdrivers.
8. Check the condition of the bush (pos. 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 (pos. 105) using the
plastic bush included in the kit.
4. Tighten the screws (pos. 188a) securing the shaft
seal to 16 Nm.
5. Fit the impeller. Make sure that the key (pos. 9a)
is fitted correctly.
6. Fit and tighten the screw (pos. 188a) securing
the impeller to 22 Nm.
7. Place the motor part with impeller in the pump
housing (pos. 50).
8. Fit and tighten the clamp (pos. 92).
9. Fill the oil chamber with oil. See section
change.
For adjustment of impeller clearance, see section
10.2 Adjusting the impeller
10.5 Oil
clearance.
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