Solid G- And Q Impeller: Readjusting The Suction Port - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

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9.6.4 SOLID G- and Q impeller: Read-
justing the suction port
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1 2
3 4
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Fig. 13: SOLID G: Readjusting the gap
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Maintenance and repair
1 Hexagon nut for suction port attachment
2 Threaded bolt
3 Laminated core
4 Laminated core fastening screw
5 Gap between suction port and hydraulics housing
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Lifting equipment with sufficient bearing capacity is present.
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Protective equipment has been put on.
1. Attach lifting equipment with suitable lifting gear to the attachment point of the pump.
2. Lift the pump so that the pump is approx. 50 cm (20 in) above the ground.
3. Loosen the hexagon nuts for fixation of the suction port. Unscrew the hexagon nut un-
til the hexagon nut is flush with the threaded bolt.
WARNING! Risk of crushing fingers! The suction port can stick on the hydraulics
housing due to encrustations and slide down suddenly. Loosen the nuts only in a
crosswise manner and grasp them from the bottom. Wear protective gloves!
4. Suction port is on the hexagon nuts. If the suction port sticks to the hydraulics housing,
carefully loosen the suction port with a wedge!
5. Clean the sliding surface and the screwed-on laminated cores and disinfect (if neces-
sary).
6. Loosen the screws from the laminated cores and remove the individual laminated cores.
7. Slowly re-tighten the three hexagon nuts crosswise until the suction port is in contact
with the impeller. CAUTION! Only tighten the hexagon nuts by hand! If the hexagon
nuts are excessively tightened, it can result in damage to the impeller and the motor
bearings!
8. Measure the gap between the suction port and hydraulics housing.
9. Adjust the laminated cores according to the measured dimensions and add another
metal sheet.
10.Unscrew the three hexagon nuts again until the hexagon nuts are flush with the
threaded bolt.
11.Reinsert the laminated cores and screw it into place.
12.Tighten the hexagon nuts crosswise until the suction port is flush with the laminated
cores.
13.Firmly tighten the hexagon nuts crosswise. Observe the tightening torques in the ap-
pendix!
14.Reach into the suction port from below and turn the impeller. When the gap is correctly
set, the impeller can be rotated. If the gap is too small, the impeller is difficult to rotate.
Repeat setting. WARNING! Danger of amputation of limbs! Sharp edges can form on
the suction port and impeller. Wear safety gloves to protect against cuts!
▶ Suction port correctly set. Pump can be reinstalled.
WILO SE 2019-01