Operation; Maintenance And Troubleshooting; Brush Replacement - Liberty Pumps 331 Mode D'emploi

Operation

IMPORTANT: Pump must be primed before operating to prevent
shaft seal failure. To do this, remove the prime plug (refer to
Figure 2) and fill the housing with water (approx. 2 cups). Replace
the prime plug (hand-tighten only).
Connect hoses, making sure each connection is tight. A pin hole
leak in the suction hose will prevent the unit from priming. If using
a garden hose (not recommended), be sure to use a new rubber
gasket.
Plug the power cord into a properly fused and grounded GFCI
electrical outlet. Turn the power switch to the "on" position. The
amount of time it takes the pump to prime depends on the
suction hose length and height. A maximum vertical suction lift of
15 ft through a ¾" diameter garden hose could take up to
2 minutes to prime.
A check valve installed near the bottom of the suction hose (not
included) is recommended for suction lifts of more than 10 ft. This
will reduce the amount of time required to draw water.
NOTICE
 Pump retains water after use. In areas that are prone to
freezing temperatures, be sure to drain the pump before
storing it.
 When used to transfer materials other than clear water
(such as glycol or vinegar), the pump must be flushed
with water and drained before storage to prevent
potential pump damage. Some chemicals used in
hydronic systems can result in corrosion of the aluminum
pump housing.
Problem
Pump will not run.
7327000F
Table 2. Troubleshooting Matrix
Possible Cause
Tripped circuit breaker, tripped GFCI, blown
fuse, or other interruption of power.
Improper voltage.
Worn motor brushes.
Impeller blockage.
Defective motor or switch.
Copyright © Liberty Pumps, Inc. 2018 All rights reserved.

Maintenance and Troubleshooting

RISK OF ELECTRIC SHOCK
WARNING
 Always disconnect the pump from power source before
attempting to service the pump. Fatal electrical shock
could occur.
Replacement parts for this product are available at
http://www.libertypumps.com/Services/Replacement-Parts.

Brush Replacement

The Model 331 operates with a brush-type air-cooled motor. To
remove brushes for replacement or cleaning, disconnect the
power cord from electrical supply. Remove the brush caps (one on
each side) by turning them with a screwdriver counterclockwise.
The brushes are attached to coil springs, which pull outward from
the pump. If used brushes are to be reinserted, mark the location
of each brush (left or right) and reinstall on the same side, in the
same orientation. Brush replacement should be scheduled after
approximately every 300 hours of use.
Figure 3. Motor Brush (only one side shown)
Corrective Action
Reset tripped circuit breaker, reset GFCI, replace blown
fuse with properly sized fuse, check that the unit is securely
plugged in, investigate power interruption.
If voltage is under 108V, check wiring size.
Remove extension cord, if connected, or use one of a
heavier gauge.
*Replace brushes.
*Remove blockage – remove the 4 screws that retain the
impeller plate or remove the cap located at the back of the
unit and turn the shaft with a flat screwdriver.
*Replace motor or switch – contact factory.
Brush Access
Cap
Motor Brush
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