6850000C
Copyright © Liberty Pumps, Inc. 2020 All rights reserved.
9 | EN
Maintenance
Pump should be checked quarterly for corrosion and wear. As the
motor is oil-filled, no lubrication or other maintenance is required.
Severe operating environments will require more frequent checks.
Field Service on Hazardous Location Pumps
The power and control cord are not field replaceable. If either cord
is compromised, the entire pump must be brought to an
authorized hazardous motor enclosure repair facility approved by
Liberty Pumps.
The only allowable repair/replacement without compromising the
hazardous location rating of the pump is the lower shaft seal. A
certified repair shop should perform this task since they have the
capability to clean and flush the mid oil chamber.
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
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 hazardous motor enclosure repair facility approved by
Liberty Pumps or its authorized service centers, automatically
voids warranty.
Table 2. Troubleshooting Matrix
Problem
Possible Cause
Corrective Action
Pump does not start.
Damaged power cable.
Return pump to an authorized repair facility.
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 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.
Pump does not start
and overload heaters
trip.
Unintentional ground.
Turn off power and check motor leads for possible
ground.
3-phase motor winding failure.
Check resistance of motor windings. All three phases
should have the same reading.
Obstructed impeller or volute.
Remove obstruction.
Pump operates with
control panel selector
switch in Hand position
but does not operate in
Auto position.
Control circuits malfunctioning.
Check float level control or the alternator relay for issues.
Check control panel.
