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©Copyright 2008 Liberty Pumps Inc. All rights reserved - 4 -
2.
Introduction
2-1 INTRODUCTION
This manual was prepared to assist you in the correct installation, operation, and maintenance of your Liberty
pump. Please read it completely before installing the pump. Make certain that you are familiar with the contents,
and the chapters on installation and operation are fully understood before running the pump.
Liberty Pumps are designed for minimal maintenance. However, regular checks will ensure longer life and
greater operating reliability.
WARRANTY: No repair work should be carried out during the warranty period without prior factory approval. To
do so may render the warranty void.
SERIAL #: In all correspondence and reports, make certain that the pump serial number is given.
2-2.1 DESIGN OF PUMP
The grinder pump contains metal parts that rotate at high speeds. Be careful around
pump base while power is connected. Make sure that the pump is either in the tank or
clear from people and wires when in operation.
1. Liberty LSG and LSGX-Series grinder pumps are designed for continuous underwater operation. The motor and
pump form a close coupled, watertight unit. The induction motor is insulated against heat and moisture in
accordance with Class B 265F (130C) regulations.
2. A thermal overload protector is imbedded in the stator windings. This is connected in series and wired to shut
down the pump if overheating occurs. The overload switch resets automatically when the motor cools.
3. The motor is protected against damage from water entry by two seals. The lower seal is a viton lip seal. The
upper seal is mechanical, consisting of two silicon-carbide faces.
4. The impeller and volute are designed for efficient flow characteristics and clog-free operation. The hardened
cutters grind solids and fibrous matter into small particles that can be safely pumped through small diameter
piping.
5. For sewage systems, consult local plumbing codes on requirements of venting the tank. The pump shall not be
installed in locations classified as hazardous in accordance with the National Electrical Code, ANSI/ NFPA70.
NOTE: The major material of Liberty LSG and LSGX-Series pumps is cast iron. They should not be used to pump
corrosive liquids.
3.
Mechanical Installation
3-1 INSPECTION UPON RECEIPT
The shipping container should be immediately inspected for damage that may have occurred in shipment.
Exercise care in opening the shipping container to avoid damage to the pump. Remove any blocking and
cushioning from within the container.
Check all cushioning for spare parts before discarding. Visually check the pump and any spare parts for damage.
Check for damaged electrical wires, especially where they exit the motor housing. Contact the Liberty Pumps
Customer Service Department to report any damage or shortage of parts. Turn the hex socket head cap screw at
the center of the cutter wheel on the bottom of the grinder several rotations clockwise. This will insure that the
impeller and cutter are free of any seizure due to prolonged storage. If the impeller is not rotated manually prior
to installation, the pump may fail to activate. If the impeller’s rotation is difficult or completely resistant, contact
the Liberty Pumps Customer Service Department.