PEDROLLO MAGNIFICA Serie Instrucciones Originales De Uso página 31

• Disconnect the pump from the delivery and suction pipes.
• Empty the pump casing (see chapter on Emptying pump casing).
• Unscrew and remove the body-base fixing screws.
• Unscrew and remove the motor body-mounting screws.
• The pump casing can now be removed from the structure.
Replacing a mechanical seal
• The impeller must be removed when replacing the mechanical seal.
• Insert a flat-blade screwdriver into the notch on the motor shaft on the fan side (remove the fan cover if necessary).
• Block the impeller by hand and unscrew it by turning the shaft with the screwdriver anticlockwise.
(The fan and fan cover can also be removed if necessary, and the shaft end clamped with a vice or other suitable tool).
• Remove the impeller. The rotating part of the mechanical seal is also removed with the impeller.
• Remove the rotating part of the seal.
• Remove the fixed part of the seal from its housing.
Reassembly of the mechanical seal
• After replacing the seal, reassemble the rotating part on the impeller housing by pushing it to the stop and the fixed part
on the cover housing.
• Lubricate the seal with alcohol or water.
• Reassemble the impeller on the shaft, holding it with one hand and screwing the shaft clockwise with a screwdriver until
the impeller is locked on the stop shoulder.
• Only for three-phase versions: to prevent unscrewing of the impeller in the case of reversed phases, clean the threaded
end of the shaft and apply weak threadlocker (e.g. Loctite 222). Check the direction of rotation before putting water into
the pump if If there is no threadlocker.
• Complete reassembly by performing the assembly steps in reverse order.
Tighten the motor body-support locking screws with alternating crosswise turns on diametrically op-
posite positions with a tightening torque of 7 Nm.
Tighten the body-base anchor screws to a maximum torque of 3 Nm.
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