Wilo Stratos GIGA Betriebsanleitung Seite 115

Dismantling
Installation
Installation and operating instructions Wilo-Stratos GIGA, GIGA-D, GIGA B
NOTICE:
The magnets inside the motor pose no risk to persons with pacemak-
ers provided that the motor is not opened and the rotor is not
removed. The mechanical seal can be replaced without any risk.
1. Switch off the system (voltage-free state) and secure it against
being switched on again.
2. Close the shut-off devices upstream and downstream of the
pump.
3. Ensure system is voltage-free.
4. Earth the work area and short-circuit.
5. Disconnect the mains connection cable. If present, remove the
cable for the differential pressure sensor.
6. Depressurise the pump by opening the air vent valve
(Fig. 6, Item 1.31).
DANGER! Risk of scalding!
Due to high fluid temperatures there is a danger of scalding.
• If the pump fluid is hot, allow it to cool down before performing any
work.
7. If present, remove the pressure measurement lines of the differ-
ential pressure sensor.
8. Dismantle the coupling guard (Fig. 6, Item 1.32).
9. Loosen the coupling screws of the coupling unit (Fig. 6,
Item 1.41).
10. Loosen the motor fastening screws (Fig. 6, Item 5) on the motor
flange and lift the drive off the pump with suitable hoisting gear.
11. By loosening the lantern fastening screws (Fig. 6, Item 4), dis-
mantle the lantern unit with coupling, shaft, mechanical seal and
impeller from the pump housing.
12. Loosen the impeller fastening nut (Fig. 6, Item 1.11), remove the
lock washer (Fig. 6, Item 1.12) beneath it and pull the impeller
(Fig. 3, Item 1.13) from the pump shaft.
CAUTION! Risk of material damage!
Risk of damaging shaft, coupling and impeller due to improper han-
dling.
• If dismantling is difficult or if the impeller jams, do not hit the
impeller or shaft at the side (e.g. with a hammer), but instead, use
a suitable extraction tool.
13. Pull the mechanical seal (Fig. 6, Item 1.21) off the shaft.
14. Pull the coupling (Fig. 6, Item 1.4) with the pump shaft out of the
lantern.
15. Thoroughly clean the sliding/seat surfaces of the shaft. If the
shaft is damaged, it must be replaced.
16. Remove the stationary ring of the mechanical seal with the seal-
ing collar out of its seat in the lantern flange, as well as the O-ring
(Fig. 6, Item 1.14) and clean the seal seats.
17. Clean the seating surfaces of the shaft carefully.
18. Press a new mechanical seal stationary ring with collar into the
gasket seat of the lantern flange. A commercially available dish-
washing liquid can be used as a lubricant.
19. Install a new O-ring in the groove of the O-ring seat of the lan-
tern.
20. Check the coupling sliding surfaces. If necessary, clean and
slightly oil them.
21. Pre-install coupling shells on the pump shaft with shims inserted
in between and insert the pre-assembled coupling/shaft unit
carefully into the lantern.
(11-22kW)
English
115