Grundfos MQ Operating instructions

GRUNDFOS

ILLUSTRATED SERVICE INSTRUCTIONS

50/60 Hz

Contents

Fitting the non-return valve in the suction port .................................................................... 2

Dismantling the pump.......................................................................................................... 3

Assembling the pump........................................................................................................ 10

Replacing the capacitor..................................................................................................... 18

Replacing the flow sensor ................................................................................................. 20

Replacing the pressure switch........................................................................................... 24

Replacing the non-return valve of the outlet...................................................................... 27

Fitting the non-return valve

in the suction port

Remove the suction port.

Fit the non-return valve into the suction port.

Fit and tighten the suction port.

Dismantling the pump

Remove the screw of the clamp.

Remove the clamp.

Remove the screws of the pump sleeve.

Loosen the pump sleeve using a screwdriver.

Remove the pump sleeve.

Pull out the self-priming part.

Remove the inlet part.

Remove the O-ring from the self-priming part.

Pull the valve seat out of the self-priming part.

Remove the O-ring from the valve seat.

Remove the O-ring from the inlet part.

Remove the plug in the middle of the motor cover.

Hold the shaft with a screwdriver.

Slacken the impeller nut while holding the shaft.

Remove the washers.

Remove the impellers and chambers.

Remove the washers.

Pull off the rotating shaft seal part using two screw-

drivers.

Remove the stationary shaft seal part if the motor is

not to be pulled out.

Insert a screwdriver between the pump housing and

the rubber ring, and prise out the stationary shaft seal

part.

Pull the rubber ring out of the pump housing using a

screwdriver, and remove both rings.

Remove the four screws of the terminal box cover.

Take off the cover.

Remove the screws of the control unit.

Remove the retaining clip of the capacitor.

Disconnect the red and white motor conductors from

the capacitor.

Disconnect the blue motor conductor from the terminal

block.

Slacken the screw which fixes the earth conductor of

the motor.

Loosen the cover of the pressure tank with a light

blow.

Unscrew the pressure tank.

The pressure tank.

Remove the screws of the end cover.

Remove the four screws in the hole for pressure tank.

Disengage the end cover from the pump using a

screwdriver.

Pull out the motor conductors.

Push out the motor.

Remove the O-ring from the motor.

Remove the O-ring on the shaft using a screwdriver.

Remove the stationary shaft seal part if it has not been

removed (picture 19).

Remove the rubber ring.

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