Impeller Replacement; Mechanical Seal Replacement - dreno COMPATTA M Serie Manual De Instalación Y Mantenimiento

A) Unscrew the 4 screws that connect the motor casing to the body pump, or the tripod in the case of the, AM-T
40/2/110 C.218-219, AM-T 50/2/110 C.225-226, GM-T 32/2/110 C.149-150, Grix M-T 100-150-200 and
APX M-T 100-150-200.
B) Remove the pump body or the tripod.
C) Keeping the impeller blocked, unscrew the hexagonal head screw or the self locking nut, which connect it to
the motor shaft.
D) Unscrewing this screw or nut, you can easily remove the impeller. Before mounting a new impeller, pay at-
tention that the terminal part of the shaft is clean and without imperfections.
E) Before replacing the mechanical seal, you have to extract the impeller as described at point 10.
F) Using two screwdrivers, remove the old mechanical seal, doing lever on the rotating part first and after on
the fixed ring (in the serie AM-T 40/2/110 C.218-219, AM-T 50/2/110 C.225-226, GM-T 32/2/110 C.149-150,
Grix M-T 100-150-200 and APX M-T 100-150-200 pay attention in positioning the pump,in order to avoid the
discharge of the oil from the chamber).
G) Before mounting a new mechanical seal, check the seats are clean, without burrs or rulings, which may dam-
age the mechanical seal or compromise the perfect seal on the shaft.
H) Wet both parties of the mechanical seal with water-soap solution, to insert it easier.
ATTENTION: To push in seat the fixed ring, use a bush (having the same diameter of the shaft), to avoid
jammings that can cause the broken of the fixed ring. Follow with the insertion of the rotating part.
I) Now you can insert and fix the impeller and close the pump.
The tools necessary for a normal maintenance of the electropumps are the following:
• Allen screw keys of : 4 and 5 mm
• Cross screwdriver
• 2 screwdrivers
• Hexagonal keys of: 8 and 17 mm
The pump does not start:
• Loss of electric power supply (check if the fusibles have broken or a protection relay of the circuit intervented);
• The selection switch is turned OFF (turn ON);
• Loss of phase (check the connection);
• The impeller is blocked;
• Mechanical seal or ball bearing seized.
The pump does not stop:
• Failure to the stop regulator (clean or replace the stop regulator).
• The pump is not able to empty the tank till the stop level: there may be leaks in the installation; absence of
the non return ball valve, to avoid the liquid reflow; necessity to replace the pump with another one of bigger
capacity.
The pump works, but the delivery is scarce or inexistent:
• The pump works with a wrong rotating direction (this is possible only with threephase motors);
• Check the wear conditions of the hydraulic part, if necessary replace the parts;
• The pump is closed by an air-pocket (switch off the electropump and restart it after few minutes);
• The delivery pipe is obstructed, the non return ball- valves or the sluicegates are in part closed.

10. Impeller replacement

11. Lower mechanical seal replacement
13. Troubles and remedies
12. Tools
- 32