MAINTENANCE
Impeller Removal
Refer to the the following procedure and Figure 19 for the removal of the impeller.
1.Remove oil plug (item 193) and
2.Remove suction strainer/ring stand (item 84A).
3.Remove the six suction cover bolts and washers (items 188A/188B) that secure the suction cover (item 189) to the pump housing (item 50). Remove suction cover (item 189).
4.Remove impeller cap nut (item 188) and washer (item 66) from motor shaft.
5.Remove impeller (item 49), gap washer (item 49A) and impeller key (item 9A) from motor shaft.
6.Reassemble in reverse order.
Figure 19. Impeller Removal
NOTICE
Clearance between impeller and wear plate should be between .011~.019 in. (0.3~0.5 mm). If impeller is defective or badly worn, replace immediately.
Long Term Storage
1.Area must be free from excessive humidity, corrosive gases, vapors or vibrations which might damage the pump.
2.Store pump in a vertical position on a pallet or stand.
3.Coil up the cable, and seal the open end (control box wires) with waterproof tape or a cable cap. This will prevent moisture from penetrating into the motor which could cause severe damage to the windings.
4.Give all unpainted surfaces a light coat of oil or grease to prevent corrosion.
5.If new pumps are stored for more than two months, turn the impeller by hand every two months to prevent the mechanical seal faces from seizing up. Failure to do this may result in seal damage when the pump is started.
Water Tank Storage
1.If an installed pump (immersed in water) has not been in operation for a long period of time, check the insulation resistance and run the pump for 30 minutes every month.
If the pump cannot be run due to lack of water in the tank inspect the pump and turn the impeller by hand each month and prior to putting the pump back into service. If insulation drops below 10 megohms, contact an authorized Multiquip service center.
ST4125G/ST6125G SUBMERSIBLE PUMP• OPERATION MANUAL — REV. #0 (11/18/10) — PAGE 23
