Grundfos SE1 50 Notice D'installation Et De Fonctionnement page 37

8.1.3 Cleaning and inspecting the pump
Clean the pump on site at regular intervals in the
following way:
• Lift the pump out of the tank.
• Hose down the pump externally by using a
high-pressure cleaner at a maximum of 100
bar.
• Remove caked dirt from the motor to ensure
appropriate heat conductivity. A mild
detergent, which is approved for disposal into
the sewage system, may be used.
• If necessary, scrub the pump with a soft brush.
Visual inspection of the pump must include the
following:
• Search for cracks or other external damage.
• Check the lifting bracket and lifting chain for
wear and corrosion.
• Inspect the power cable for cracks,
lacerations, kinks, or other damage in the
sheath.
• Inspect the visible parts of the cable entry for
cracks.
• Check that the cable is firmly connected to the
top cover.
• Check all visible screws for self-loosening and
tighten them, if necessary.
The pump is fitted with a vent valve at the bottom
of the cooling jacket. The valve may be removed
and cleaned, if necessary. Clean the vent hole
before refitting the valve after cleaning.
8.1.4 Cleaning or replacing the pump housing
For position numbers, see the Appendix.
Dismantling
1. Loosen the clamp (92).
2. Remove the screw (92a).
3. Remove the pump housing (50) by inserting
two screwdrivers between the sleeve and the
pump housing.
4. Clean the pump housing, if necessary.
Assembling
1. Fit the pump housing (50).
2. Fit the clamp (92).
3. Tighten the screw (92a) to a torque of 8.8 ft-lb
(12 Nm).
4. Check that the impeller (49) rotates freely.
Related information
A.1. Appendix
8.1.3 Cleaning and inspecting the pump
8.1.5 Replacing the impeller
CAUTION
Sharp element
Minor or moderate personal injury
‐
Do not touch the sharp edges of
the impeller without wearing
protective gloves.
Dismantling
1. See section Cleaning or replacing the pump
housing.
2. Remove the screw (188a). Hold the impeller
(49) with a strap wrench. See the figure below.
3. Loosen the impeller (49) with a light blow on
the edge. Pull it off.
4. Remove the key (9a) and the corrugated
spring (157).
Removing the impeller
Assembling
1. Fit the corrugated spring (157) and the key
(9a). Keep the key (9a) in position while fitting
the impeller (49).
2. Fit the impeller (49).
3. Fit the washer (66), nord-lock washer (66b),
and the screw (188a).
4. Tighten the screw (188a) to a torque of 75
Nm. Hold the impeller (49) with the strap
wrench.
5. Mark the position of the pin (6a) on the pump
housing (50).
6. Mark the position of the pin hole on the oil
chamber.
7. Fit and lubricate the O-ring (37) with oil.
8. See section Cleaning or replacing the pump
housing for the final assembling steps.
Related information
A.1. Appendix
8.1.4 Cleaning or replacing the pump housing
37