Liberty Pumps 331 User Manual [en, es, fr]

7000 Apple Tree Avenue
Bergen, NY 14416
Phone: [phone]
Fax: [phone]
www.libertypumps.com

Contents

1.) General Information

2.) Safety Guidelines

3.) Installation

4.) Operation

5.) Maintenance and Troubleshooting

Installation and User Manual 7327000E

Model 331 Portable Transfer Pump

IMPORTANT:

Prior to installation, record Model,
Serial Number, and Code Number from
pump nameplate for future reference.

MODEL ___________________

SERIAL ___________________

CODE ___________________

©Copyright 2011 Liberty Pumps Inc. All rights reserved

Length

25 ft

50 ft

100 ft

Wire Size

#16

#16

#14

2. Safety Guidelines

1. General Information

Before use, please read the following instructions carefully. Each Liberty Pump is individually factory tested to ensure proper
performance. Closely following these instructions will eliminate potential operating problems, providing years of trouble-free service.

This portable transfer pump is designed for such applications as emptying water heaters, swimming pool covers, livestock tanks, boats,
etc. When used for charging or servicing hydronic systems, the pump must be flushed with clear water afterwards to prevent corrosion.
It can also be used for an intermittent pressure boost for applications such as washing cars, cleaning driveways, etc. The motor is a
brush type air-cooled design.

Do not use under water or in wet areas. Pump is intended for dry locations only.

Do not use this pump with water over 140 F.

This manual contains information that is very important to know and understand. This information is provided for SAFETY and to
PREVENT EQUIPMENT PROBLEMS.

Do not submerge motor or allow motor to be exposed to water. Personal injury and/or death could result.

Do not use to pump flammable or explosive fluids such as gasoline, fuel oil, kerosene, etc. Do not use in a
flammable and/or explosive atmosphere. Personal injury and/or death could result.

Risk of fatal electrical shock. Never remove the round grounding blade (see Fig. 1).
Cutting the cord or plug will void the warranty and make the pump inoperable.

 Always disconnect the pump from power source before attempting to install or service the pump. Never

handle a pump with wet hands or when standing on a wet or damp surface or in water. Fatal electrical shock could occur.

 The pump should be plugged into a properly fused electrical outlet with a ground fault circuit interrupter (GFCI) that conforms to

current National Electric codes (NEC) and local codes. All wiring must be performed by a qualified electrician.

 This pump has been fitted with a 20’ power cord. Do not use an extension cord unless absolutely necessary. Follow the Extension

Cord Length Table for proper gauge of a 3-wire, grounding type extension cord.

 Disconnect power and release all pressure within the system before servicing any component.
 Drain all liquids from system before servicing.
 Read all instructions before operation.

 Secure the discharge line before starting the pump. An unsecured discharge line under pressure may whip. Personal injury and/or

death could result.

 Periodically inspect pump and system components, checking for weak and/or worn hoses. Be sure all connections are secure.
 Protect electrical cord from sharp objects, hot surfaces, oil and chemicals. Avoid kinking the power cord.

Extension Cord Length Table:

©Copyright 2011 Liberty Pumps Inc. All rights reserved 2

Brass male hose to male pipe

Prime plug – add water here prior to pump
operation.

Brass female hose

Suction hose (not included) - should not be
longer than needed (15’ maximum suction
lift). Use a high quality hose to prevent
collapsing.

Plastic male hose strainer

Motor
Brush

Brush
Access
Cap

3. Installation

4. Operation

5. Maintenance and Troubleshooting

Adapters are furnished with the pump. The inlet and discharge are threaded with a ¾” NPT. Standard water pipe can be threaded
directly into the casting. If a garden or other hose is to be used, the brass fittings must be installed. It is recommended that plumbing
tape or a pipe thread sealant when using the brass fittings. Liberty Pumps recommends that the swivel fitting be installed on the front of
the pump. NOTE: to reduce the possibility of hose collapse, use a high quality hose on the suction line (an ordinary garden hose may
collapse under suction pressure and should not be used).

Fig. 2

A strainer is furnished and should be used if pumping from a creek, pond, or source where foreign objects may be sucked into the
pump. The strainer helps prevent solids from entering the inlet line. This pump must be filled with water before operating.
Running the pump dry will cause damage to the shaft seal. This unit is not waterproof or weatherproof and should not be used in
showers, saunas, or other potentially wet locations. The motor is designed for use in a clean, dry location. The unit draws fresh air in
from the back and blows warm air out the sides, do not block air vents. Ambient temperatures around the motor should not exceed
104°F (40°C) in order to adequately cool motor. The motor is equipped with a thermal protector. If the motor temperature rises, the unit
will automatically turn-off. To reset the thermal switch simply unplug the unit or turn the electrical switch from on to off and allow unit to
cool. The switch must be in the off position in order for it to cool down. Please note that the water temperature should not exceed 140°
F.

1. IMPORTANT: Pump must be primed before operating to prevent shaft seal failure. To do this, remove the prime plug

(see Fig. 2) & fill the housing with water (approx. 2 cups). Replace the prime plug (hand-tighten only).

2. Connect garden 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, be sure to use a new rubber gasket.

3. 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 line length and height. A maximum vertical suction lift of 15 feet
through a ¾” diameter garden hose could take up to 2 minutes to prime.

4. A check valve installed near the bottom of the suction hose (not included) is recommended for suction lifts of more than 10 feet
(this reduces the amount of time required to draw water).

5. Please note that this pump retains water after use. In areas that are prone to freezing temperatures, please
be sure to drain the pump before storing it.

6. When used to transfer materials other than clear water (such as glycol), 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.

The Model 331 operates with a brush-type motor. To remove brushes for replacement or
cleaning, disconnect the power cord from electrical supply. Remove the brush caps 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.

©Copyright 2011 Liberty Pumps Inc. All rights reserved 3

Problem

Cause

Correction

Pump will not run.

 Blown fuse or other interruption of

power; improper voltage.

 *If blown, replace with properly sized fuse or

reset breaker; if voltage is under 108V, check
wiring size. Remove extension cord if
connected or use one of a heavier gauge.

 Worn motor brushes.

 *Replace brushes

 Impeller blockage.

 *Remove blockage – this can be done by

removing the 4 screws that retain the impeller
plate or by removing the cap located at the
back of the unit and turning the shaft with a
flat screwdriver.

 Defective motor or switch.

 *Replace motor or switch – consult factory.

Pump will not prime
or retain prime after
operating.

 Air leak in suction line.

 Replace suction line.

 Impeller blocked.

 *Remove front plate and clean impeller area.

 Impeller broken or worn.

 *Replace impeller – contact factory.

 Suction lift too high.

Lower pump or use a check valve near the
bottom of the suction line (maximum suction
lift 15’).

 Hose kinked, looped, or collapsed.

 Straighten hose or replace with heavier

reinforced hose.

 Fittings not tight.

 Tighten fittings. Use new rubber hose

gaskets.

 Suction hose out of water.

 Submerge suction hose and re-prime.

 Clogged inlet.

 *Clean inlet or suction screen at hose end.

Flow rate is too low.

 Piping or hose is clogged or

damaged.

 Replace hose or check hose for kinks.

 Narrow piping or hose diameter.

 Replace hose with ¾” reinforced hose.

 Low line voltage.

 *Check voltage. If under 108V, check wiring

size. Remove extension cord or use one with
a heavier gauge.



NOTE: Liberty Pumps, Inc. assumes no responsibility for damage or injury due to disassembly in the field. Disassembly, other than at

Liberty Pumps or its authorized service centers, automatically voids warranty. All electrical work should be done by a qualified
electrician.

3 Year Limited Warranty Liberty Pumps, Inc. warrants that pumps of its manufacture are free from all factory defects in
material and workmanship for a period of 3 years from the date of purchase. The date of purchase shall be determined by a
dated sales receipt noting the model and serial number of the pump. The dated sales receipt must accompany the returned
pump if the date of return is more than 3 years from the "CODE" (date of manufacture) number noted on the pump nameplate.

The manufacturer's obligation under this Warranty shall be limited to the repair or replacement of any parts found by the
manufacturer to be defective, provided the part or assembly is returned freight prepaid to the manufacturer or its authorized
service center, and provided that none of the following warranty-voiding characteristics are evident.

The manufacturer shall not be liable under this Warranty if the product has not been properly installed; if it has been
disassembled, modified, abused or tampered with; if the electrical cord has been cut, damaged or spliced; if the pump
discharge has been reduced in size; if the pump has been used in water temperatures above the advertised rating, or water
containing sand, lime, cement, gravel or other abrasives; if the product has been used to pump chemicals or hydrocarbons; if a
non-submersible motor has been subjected to excessive moisture; or if the label bearing the serial, model and code number
has been removed. Liberty Pumps, Inc. shall not be liable for any loss, damage or expenses resulting from installation or use of
its products, or for consequential damages, including costs of removal, reinstallation or transportation.

There is no other express warranty. All implied warranties, including those of merchantability and fitness for a particular
purpose, are limited to three years from the date of purchase.

©Copyright 2011 Liberty Pumps Inc. All rights reserved 4

This Warranty contains the exclusive remedy of the purchaser, and, where permitted, liability for consequential or incidental
damages under any and all warranties are excluded.