7550000G
Copyright © Liberty Pumps, Inc. 2022 All rights reserved.
11 | EN
Replacement impellers must match the part number of
original impeller installed from the factory. Do not trim
impellers without consulting the factory.
Verify correct 3-phase pump rotation before returning to
service.
Maintenance
As the motor is oil-filled, no lubrication or other maintenance is
required. If ordinary location pumps require replacement
lubrication, use ISO VG
10 turbine oil. Contact the factory for
proper replacement procedure. For Hazardous Location pumps,
removing any oil plugs needs to be done by someone who is
certified to work on Explosion Proof motors.
To keep the pump/pump system operating smoothly, perform the
following routine checks. Severe operating environments will
require more frequent checks. For any issues that are not
resolvable, contact Liberty Pumps for further assistance.
Monthly
1.
Pumps that are idle for more than a month in a dry basin
should have impellers manually operated through the
breaker panel monthly to lubricate the seals.
Limit the
lubrication run time to less than one minute per pump.
2.
Pumps that are idle in a wet basin must be removed—
do not
store pump in wet basin.
Quarterly
1.
Check pumps for corrosion and wear.
2.
Check for free and unobstructed float switch operation and
float switch condition.
3.
Inspect for proper check valve operation.
4.
For multiple pumps, check for balanced operating times.
Uneven times indicate a defective unit, float switch or control.
5.
Inspect the control panel for any presence of moisture in
enclosure, loose connections, and general component
condition.
Annually
1.
Basin should be inspected and cleaned. Replace any defective
components.
Field Service on Hazardous Location Pumps
The only allowable repairs/replacements without compromising
the hazardous location rating of the pump are: Quick-connect
cords, lower (outer) shaft seals, volute, and impeller components.
Otherwise, the pump must be returned to Liberty Pumps or an
authorized hazardous repair facility for electrical and motor
service. This will ensure the integrity of the hazardous location
rating of the pump and comply with Liberty Pumps warranty
requirements.
Troubleshooting
Refer to Table
3 for troubleshooting guidance.
No repair work shall be carried out during the warranty period
without prior factory approval. To do so may void the warranty.
Liberty Pumps, Inc. assumes no responsibility for damage or injury
due to disassembly in the field. Disassembly, other than an
authorized motor enclosure repair facility approved by Liberty
Pumps or its authorized service centers, automatically voids
warranty.
Table 3. Troubleshooting Matrix
Problem
Possible Cause
Corrective Action
Pump does not start.
Control panel selector switch in Off position.
Set selector switch to Hand or Auto position.
Blown control circuit transformer fuse.
Replace fuse.
Tripped circuit breaker, blown fuse, or other
interruption of power.
Reset tripped circuit breaker; replace blown fuse
with properly sized fuse; investigate power
interruption.
Improper voltage.
Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Float switch is unable to move to the PUMP ON
position due to interference in basin or other
obstruction.
Position the pump or float switch so that it has
adequate clearance for free movement.
Insufficient liquid level.
Verify the liquid level is allowed to rise enough
to activate float switch(es).
Defective float switch.
Replace float switch.
Obstructed impeller or volute.
Remove obstruction.
Loose wiring connections.
Check and tighten all connections.
Thermal overload tripped.
Wait for pump to cool to operating
temperature.
