Gianneschi 01GMV434G, Use And Maintenance Manual, Page: 11 / 34

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The joint is still connected to the drive shaft on one side; the other side is free because the
rotor has been removed.
Screw a nut and locking nut on the free thread and lock them by rotating in the opposite
direction to each other.
Now turn in an anti-clockwise direction, the nut and the joint will unscrew from drive
shaft. Clean all parts.
7.2.4 Removing mechanical seal MVI - 4
Follow firstly operations explained before.
Now that you have removed the delivery chamber you can see the mechanical seal.
The first part you see is rotating face of mechanical seal.
Remove it from the drive shaft with care by using your hands only. No tools are required for
this operation. It is easy to damage the mechanical seal so be careful!
The fixed part of mechanical seal is kept in place by a stainless steel flange.
Removing this flange by unscrewing the four screws, the seal is free to be cleaned or
changed.
Clean it thoroughly using a little warm water.
7.3 MVG maintenance.
7.3.1 Removing the stator MVG-2
- Unscrew the 4 screws on the suction port.
- Remove the suction port, the stator MVG-1 will now be free to be removed, also check that
the rotor is not damaged.
- Take the new stator, lubricate it by liquid soap and insert the stator in the pump casing.
- Refit the suction port by screwing the 4 screws previously removed.
7.3.2 Removing the rotor MVG-3
Follow firstly operations explained before.
- After that, you need to disassemble the casing MVG-7 remove screws , take away delivery
chamber
Now you can see the complete drive train.
-
Secure the drive shaft by using a suitable spanner.
-
Insert a second spanner, turn the rotor anticlockwise with this spanner until it unscrews
completely. The joint is free also to be replaced.
7.3.3 Removing the joint MVG - 4
The joint is still connected to the drive shaft on one side; the other side is free because the
rotor has been removed.
Screw a nut and locking nut on the free thread and lock them by rotating in the opposite
direction to each other.
Now turn in an anti-clockwise direction, the nut and the joint will unscrew from drive
shaft. Clean all parts.