Repairing The Product - Grundfos SE1 50 Installation And Operating Instructions Manual

8.4 Repairing the product

In the following the position numbers stated in
brackets refer to the drawings on pages
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the fuses have been
removed or the main switch has been
switched off and locked in position 0.
Make sure that the power supply cannot
be accidentally switched on.
WARNING
Crushing hazard
Death or serious personal injury
- Do not stand near or under the pump
when it is lifted.
Inspect the oil level and condition every
3000 operating hours or at least once a
year.
When the pump is new or after
replacement of the shaft seal, check the oil
level and water content after one week of
operation.
8.4.1 Cleaning or replacing the pump housing
Dismantling
1. Loosen the clamp (92).
2. Remove the screw (92a) using your fingers.
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 12 Nm.
4. Check that the impeller (49) rotates freely and
without drag.
8.4.2 Replacing the impeller
50 to 51.
Dismantling
1. See section
housing.
Fig. 18
2. Remove the screw (188a). Hold the impeller (49)
with a strap wrench. See fig. 18.
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).
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) 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
housing, for the final steps of assembly.
CAUTION
Sharp element
Minor or moderate personal injury
- Wear protective gloves to avoid being
cut by the sharp edges of the impeller.
8.4.1 Cleaning or replacing the pump
Removing the impeller
8.4.1 Cleaning or replacing the pump
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