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PUMP PERFORMANCE AND SIZING CHART

MODEL

NO.

CATALOG

NO.

VOLTS

AMPS

GPM @ HEAD

SHUT OFF

(FT)

POWER

CORD (FT)

10'

20'

40'

60'

80'

100'

120'

GP-M231/

GP-M201

520865/

520855

230/

208

13.9

130

15'

INTRODUCTION

This instruction sheet provides you with the information required to safely own
and operate your product. Retain these instructions for future reference.
The product you have purchased is of the highest quality workmanship and
material, and has been engineered to give you long and reliable service. This
product has been carefully tested, inspected, and packaged to ensure safe
delivery and operation. Please examine your item(s) carefully to ensure that no
damage occurred during shipment. If damage has occurred, please contact the
place of purchase. They will assist you in replacement or repair, if required.

READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTING
TO INSTALL, OPERATE, OR SERVICE YOUR PRODUCT. KNOW THE
PRODUCT’S APPLICATION, LIMITATIONS, AND POTENTIAL HAZARDS.
PROTECT YOURSELF AND OTHERS BY OBSERVING ALL SAFETY
INFORMATION. FAILURE TO COMPLY WITH THESE INSTRUCTIONS
COULD RESULT IN PERSONAL INJURY AND/OR PROPERTY DAMAGE!

DESCRIPTION

Little Giant Submersible GP-M231/GP-M201 Series Grinder Pumps are recom-
mended for use in basins or lift stations and suitable for pumping residential
sewage, effluent, wastewater and other non-explosive, non-corrosive liquids.
Little Giant Grinder pumps utilize a cutting mechanism located on the suction
side of the pump. The solids are cut into a slurry which pass directly through
the volute into the discharge line by an impeller.
Little Giant offers complete control panel systems for automatic operation along
with a complete line of alarms, basins, covers, and check valves. A Little Giant
Pump panel or capacitor and relay kit must be used for proper operation.

SPECIFICATIONS

Discharge Size:

GP-M231/GP-M201 - 1-1/4" FNPT Vertical

Operating
Capabilities:

140°F

(60°C)

Pump Housing:

Cast iron with epoxy paint coating

Volute:

Cast iron with epoxy paint coating

Impeller:

Brass with pressure relief vanes

Motor:

3450 RPM with automatic high temperature protection

Hardware:

300 series stainless steel

Bearings:

Upper and lower ball

Shaft Seal:

Type 21 mechanical, spring loaded, rotating carbon with
Viton

bellows and ceramic stationary with Viton

O-ring

Power Cord:

14 AWG 4-conductor, copper, stranded

Cooling:

The motor housing contains a dielectric oil to provide cool-
ing for the motor and to lubricate the bearings and seals.
These pumps are capable of operating with the motor hous-
ing partially exposed for extended periods of time, providing
sufficient motor cooling and bearing lubrication. However,
for the best cooling and the longest motor life, the liquid
level being pumped should normally be above the top of the
cast iron motor cover.

Cutters:

440C stainless steel, hardened to Rockwell C 55-60

SAFETY GUIDELINES

Read all instructions and Safety Guidelines thoroughly. Failure to follow the
guidelines and instruction could result in serious bodily injury and/or property
damage.

WARNING: Risk of electric shock.

This pump is supplied with a grounding

conductor. To reduce the risk of electric shock, be certain that it is connected
only to a properly grounded, grounding-type receptacle in the control panel.
When a pump is in a basin, etc., do not touch motor housing, pipes or water
until unit is unplugged or shut off. If your Installation has water or moisture pres-
ent, do not touch wet area until all power has been turned off. If shut-off box
is not accessible, call the electric company to shut off service to the house, or
call the local fire department for instructions. Failure to follow this warning can
result in fatal electric shock.
The flexible jacketed cord assembly mounted to the pump must not be modi-
fied in any way. Do not use the power cord for lifting the pump.
1. DO NOT USE TO PUMP FLAMMABLE OR EXPLOSIVE FLUIDS SUCH AS

GASOLINE, FUEL OIL, KEROSENE, ETC. FAILURE TO FOLLOW THIS
WARNING CAN RESULT IN PERSONAL INJURY AND OR PROPERTY
DAMAGE.

2. The pump motor is equipped with an internal thermal protector switch that

opens to stop the motor when exceeding normal operating temperatures.
This switch will reset itself and start the pump when cooled to normal tem-
peratures.

3. During normal operation the grinder pump is immersed in water. Also,

during rain storms, water may be present in the surrounding area of the
pump. Caution must be used to prevent bodily injury when working near
the pump.

a. Electrical power must be disconnected prior to touching, servicing or

repairing the pump.

b. To minimize possible fatal electrical shock hazard, extreme care should

be used when changing fuses. Do not stand in water while changing
fuses or insert anything other than a fuse in the fuse socket.

4. Do not run the pump in a dry basin. If the pump is run in a dry basin, the

surface temperature of the pump will rise to a high level. This high level
could cause skin burns if the pump is touched and will cause serious dam-
age to your pump.

5. Do not oil the motor. The pump housing is sealed. A high grade dielectric

oil devoid of water has been put into the motor housing at the factory. Use
of other oil could cause serious electric shock and/or permanent damage
to the pump.

6. Do not install in locations classified as hazardous in accordance with the

National Electric Code, ANSI/NFPA 70.

7. Do not place hands, feet or clothing near the cutter mechanism when there

is any possibility the pump is connected to a power source. This pump
contains a cutting mechanism with very sharp edges that can cause severe
bodily injury.

INSTALLATION

For automatic operation, pump must be wired into a control panel. Installation
instructions are included with all Little Giant control panels and should be
referred to for installation.
Pump will not run if wired directly into an electrical outlet. This pump requires
a Little Giant capacitor kit and or control panel, which contains the appropriate
start and run capacitors in conjunction with a relay for proper operation. Refer
to the instruction manual for capacitor kit or control panel to obtain proper
component values. If this pump is run with incorrect capacitors or relay, there
could be severe damage to the pump motor and or control panel.
Pump must be installed in a suitable basin, which is at least 24" in diameter and
36" deep, and vented in accordance with local plumbing codes.
It is recommended for best performance and satisfactory installation to use a
complete factory built basin package system. This system includes optimum
materials of construction for operation.
Pump must be placed on a hard level surface using a leg accessory kit avail-
able from Little Giant if unable to suspend the pump intake at least 3-1/2" from
bottom of basin.
Never place pump directly on clay, earth or gravel surfaces.
Pump can be installed with ABS, PVC, polyethylene or galvanized steel pipe.
Proper adapters are required to connect any non-metal pipe to the pump dis-
charge if pump is suspended by the discharge on a guide rail system.