Gianneschi 01GMV434G, Use And Maintenance Manual, Page: 10 / 34

10
Stand - by
The reserve pumps, usually in stand-by state, must be periodically moved. In opposite case
the pump can be blocked during the start (for the alteration of stator shape)
7 Maintenance.
All maintenance operations must be carried out by qualified and experienced personnel
pumps are designed with simplicity in mind and this will allow you to do the servicing and
maintenance in a quick time with a professional result. Follow our instructions to avoid any
mistake.
7.1 Preliminary operations
- Remove power supply from the pump’s motor.
- Wait until the liquid temperature reduces to a safe level.
- Verify there is no system pressure by checking the suction and discharge gauges.
- Close all valves on the suction and discharge ports of the pump.
- Remove slowly the pipe work from pump connections.
Wash and clean the pump at regular intervals if the pumped liquid can produce incrustation
If for this purpose the pump needs to be opened, stop the pump and ensure it against
accidental start.
Provide to a regular cleaning program, related to the type of exercise.
7.2 MVI maintenance.
7.2.1 Removing the stator MVI-8.
- Unscrew the 4 screws on the suction port.
- Remove the suction port, the stator MVI-3 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.
7.2.2 Removing the rotor MVI-7
Follow firstly operations explained before.
- After that, you need to disassemble the casing MVI-2. Remove screws
- Take away delivery chamber MVI-1
Now you can see lantern flange with complete drive train.
- Remove metal protection MVI-17
- Secure the drive shaft MVI-1 by using a suitable spanner.
- Insert a second spanner in the free lantern flange’s space, turn the rotor anticlockwise with
this spanner until it unscrews completely. The joint is free also to be replaced.
7.2.3 Removing the joint MVI - 6