Little Giant LS Serie Manual Del Propietário página 5

MAINTENANCE
Failure to disconnect electrical power
WARNING
before attempting maintenance can
cause shock, burns, or death.
HAZARDOUS PRESSURE!
Do not run pump against
closed discharge.
Release all pressure on system
before working on any component.
Draining
Drain pump if it is in danger of freezing, if it will be out of service
for an extended period of time, or if it requires service.
To drain pump, disconnect power source, remove priming port
plug from pump case, remove drain plug (below suction port),
and drain system. Replace both plugs.
Pump Disassembly
To access the internal components of the pump, review the
exploded diagram of the pump assembly as shown on the
disassembly and repair parts page. Drain the pump as described
above, then remove the six bolts that hold the pump case to the
seal plate. This will allow the motor and hydraulic sub-assembly
to be removed from the case without disturbing the plumbing.
Locate and inspect the O-ring and square-ring, which are internal
water seals. Make sure they are in good condition and are working
properly. To remove the diffuser, loosen the 3 bolts that attach
it to the seal plate. This will expose the impeller and eye-seal.
Remove the eye-seal and then, to remove the impeller, hold the
motor shaft with a screwdriver at the opposite end of the motor.
Turn the impeller counter-clockwise (when facing impeller) to
remove. This will reveal the mechanical shaft seal. This seal can
then be removed from the motor shaft for inspection. The seal
plate can be removed from the motor by removing the 4 nuts
and washers on the backside of the motor bracket. To remove
the ceramic shaft seal, press gently from the backside on the
ceramic seal and it will fall out easily. Inspect, clean, or replace
parts as needed.
Pump Assembly
Reassemble unit by fi rst pressing the ceramic seal into the
seal plate. Use rubbing alcohol as a lubricant. Do not use an
oil, petroleum jelly, or grease as this will damage the sealing
surfaces of the shaft seal during operation. Next, install the seal
plate onto the motor using the four nuts and washers. Tighten
the nuts in a diagonal pattern to ensure a proper fi t. Place the
shaft seal on the motor shaft and then install the impeller and
eye-seal. The diffuser is positioned by three bolts and is marked
"TOP" for proper installation. Place the square-ring on the diffuser
inlet. Now lubricate the O-ring and place it around the seal plate.
Lift the motor assembly up into the pump case and attach it
using the 6 bolts. Tighten them in a diagonal pattern to ensure
proper seating of the water seals.
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