MULTIQUIP LITTLE SUB Guide

OPERATION AND PARTS MANUAL
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
LITTLE SUB™
SUBMERSIBLE PUMP
Revision #0 (09/03/19)
To find the latest revision of this
publication, visit our website at:
www.multiquip.com

PAGE 2 — LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19)
PROPOSITION 65 WARNING

LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19) — PAGE 3
TABLE OF CONTENTS
Little Sub™
Submersible Pump
Proposition 65 Warning ........................................... 2
Safety Information ................................................ 4-7
Specifications ........................................................... 8
Performance Curve.................................................. 9
General Information .............................................. 10
Components ......................................................... 11
Operation ......................................................... 12-13
Troubleshooting .................................................... 14
Cable Selection ..................................................... 15
Component Drawing
Pump Assembly ............................................... 16-17
NOTICE
Specifications and part numbers are subject to change
without notice.

PAGE 4 — LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19)
SAFETY INFORMATION
Do not operate or service the equipment before reading
the entire manual. Safety precautions should be followed
at all times when operating this equipment.
Failure to read and understand the safety
messages and operating instructions could
result in injury to yourself and others.
SAFETY MESSAGES
The four safety messages shown below will inform you
about potential hazards that could injure you or others.The
safety messages specifically address the level of exposure
to the operator and are preceded by one of four words:
DANGER, WARNING, CAUTION
or NOTICE.
SAFETY SYMBOLS
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in DEATH or SERIOUS INJURY.
WARNING
Indicates a hazardous situation which, if not avoided,
COULD result in DEATH or SERIOUS INJURY.
CAUTION
Indicates a hazardous situation which, if not avoided,
COULD result in MINOR or MODERATE INJURY.
NOTICE
Addresses practices not related to personal injury.
Potential hazards associated with the operation of this
equipment will be referenced with hazard symbols which
may appear throughout this manual in conjunction with
safety messages.
Burn hazards
Symbol Safety Hazard
Electric shock hazards
Rotating parts hazards
Pressurized fluid hazards

LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19) — PAGE 5
SAFETY INFORMATION
GENERAL SAFETY
CAUTION

NEVER operate this equipment without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job or city and state regulations.

Avoid wearing jewelry or loose fitting clothes that may
snag on the controls or moving parts as this can cause
serious injury.

NEVER operate this equipment when not
feeling well due to fatigue, illness or when
under medication.

NEVER operate this equipment under the
influence of drugs or alcohol.

ALWAYS clear the work area of any debris, tools, etc.
that would constitute a hazard while the equipment is
in operation.

No one other than the operator is to be in the working
area when the equipment is in operation.

DO NOT use the equipment for any purpose other than
its intended purposes or applications.
NOTICE

This equipment should only be operated by trained and
qualified personnel 18 years of age and older.

Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.

Manufacturer does not assume responsibility for any
accident due to equipment modifications. Unauthorized
equipment modification will void all warranties.
NEVER
use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
to the equipment and/or injury to user may result.
ALWAYS know the location of the nearest
fire extinguisher.
ALWAYS know the location of the nearest
first aid kit.
ALWAYS know the location of the nearest phone or
keep
a phone on the job site.
Also, know the phone numbers
of the nearest ambulance, doctor and
fire department.
This information will be invaluable in the case of an
emergency.

PAGE 6 — LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19)
SAFETY INFORMATION
PUMP SAFETY
DANGER

NEVER operate the equipment in an explosive
atmosphere or near combustible materials.An
explosion or fire could result causing severe
bodily harm or even death.
WARNING

Accidental starting can cause severe injury
or death. ALWAYS place the ON/OFF
switch in the OFF position.

DO NOT place hands or fingers inside
pump when pump is running.

NEVER disconnect any emergency or
safety devices. These devices are intended for operator
safety. Disconnection of these devices can cause severe
injury, bodily harm or even death. Disconnection of any
of these devices will void all warranties.

Risk of Electric Shock - Do not enter the pool or spa
if the pump is operating.
CAUTION

Be careful of discharge hose whipping under pressure.

ALWAYS check pump oil level only when pump is cool.
Expansion due to heat may cause hot oil to spray from
the oil plug when the oil plug is removed. The possibility
of severe scalding may exist.
NOTICE

ALWAYS place the pump in an upright position on a
platform before using.The platform will prevent the pump
from burrowing itself on soft sand or mud.

NEVER operate pump on its side.

DO NOT allow the pump to freeze in water.

NEVER leave an open pump chamber unattended.

ALWAYS keep the machine in proper running condition.
DO NOT attempt to thaw out a frozen pump by using
a torch or other source of flame. Application of heat in
this manner may heat the oil in the seal cavity above the
critical point, causing pump damage.
DO NOT
pump water with a temperature greater than
140°F (60°C).
DO NOT pump liquids containing acid or alkali.
ALWAYS
check strainer before pumping. Make sure
strainer is not clogged. Remove any large objects, dirt
or debris from the strainer to prevent clogging.
ALWAYS
use a large basket strainer when pumping
water that contains large debris.
ALWAYS
flush pump (clean) after use when pumping
water concentrated with heavy debris. It is very important
to always flush the pump before turning it off to prevent
clogging.

Fix damage to machine and replace any broken parts
immediately.
ALWAYS
store equipment properly when it is not being
used. Equipment should be stored in a clean, dry location
out of the reach of children and unauthorized personnel.
NEVER
lubricate components or attempt service on a
running machine.
NEVER run pump dry.
ALWAYS
allow the machine a proper amount of time to
cool before servicing.
Keep machine in proper running condition.
ELECTRICAL SAFETY
DANGER
The electrical voltage required to operate
pump can cause severe injury or even death
through physical contact with live circuits.
ALWAYS disconnect electrical power from
pump before performing maintenance on
pump.
WARNING

To reduce the risk of electric shock, connect to a circuit
protected by a Ground-Fault Circuit-Interrupter (GFCI).

LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19) — PAGE 7
SAFETY INFORMATION
NOTICE

ALWAYS make certain that the voltage supplied to the
pump is correct. Always read the pump’s nameplate to
determine what the power requirements are.
Power Cord/Cable Safety
DANGER

NEVER stand in water while AC power cord is connected
to a live power source.

NEVER use damaged or worn cables or cords. Inspect
for cuts in the insulation.

NEVER grab or touch a live power
cord or cable with wet hands. The
possibility exists of electrical shock,
electrocution or death.

Make sure power cables are securely connected to the
motor's output receptacles. Incorrect connections may
cause electrical shock and damage to the motor.
WARNING

NEVER attempt to use the power cord as a lifting or
lowering device for the pump.
NOTICE

ALWAYS make certain that proper power or extension
cord has been selected for the job. See Cable Selection
Chart in this manual.
Grounding Safety
DANGER

ALWAYS make sure pump is grounded.

NEVER use gas piping as an electrical ground.

ALWAYS make sure that electrical circuits are properly
grounded to a suitable earth ground (ground rod) per
the National Electrical Code (NEC) and local codes
before operating generator. Severe injury or death by
electrocution can result from operating an ungrounded
motor.
Control Box Safety
DANGER
ALWAYS
have a qualified electrician perform the control
box installation. The possibility exists of electrical shock
or electrocution.
NOTICE
ALWAYS
mount control box in a vertical position
protected from harsh environmental elements.
LIFTING SAFETY
CAUTION

When raising or lowering of the pump is required, always
attach an adequate rope or lifting device to the correct
lifting point (handle) on the pump.
NOTICE
NEVER
lift the equipment while the electric motor is
running.
TRANSPORTING SAFETY
NOTICE
ALWAYS shut down pump before transporting.
ALWAYS tie down equipment during transport.
ENVIRONMENTAL SAFETY/DECOMMISSIONING
CE
DO NOT pour waste or oil directly onto
the ground, down a drain or into any water
source.
Contact your country's Department of Public
Works or recycling agency in your area and arrange for
proper disposal of any electrical components, waste or
oil associated with this equipment.

When the life cycle of this equipment is over it is
recommended that the pump casing and all other metal
parts be sent to a recycling center
Metal recycling involves the collection of metal from
discarded products and its transformation into raw
materials to use in manufacturing a new product.
Recyclers and manufacturers alike promote the process
of recycling metal. Using a metal recycling center
promotes energy cost savings.

PAGE 8 — LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19)
SPECIFICATIONS
Table 1. Specifications
Model Little Sub™
Type Submersible Pump
Impeller Plastic
Suction and Discharge Size 1.125 in. and 0.75 in.
(28.575 mm and 19.05)
Maximum Pumping Capacity 33 gallons/minute
(125 liters/minute)
Discharge Height
Above Pumping Level
5 ft (1.5 meters) 1,800 gallons/hr (6,814 liters)
10 ft (3.0 meters) 1,320 gallons/hr (4,997 liters)
15 ft (4.5 meters) 720 gallons/hr (2,725 liters)
20 ft (6.0 meters) 120 gallons/hr (454 liters)
Power 0.25 HP
(0.37 kW)
Voltage Phase 1Ø 115V
Starting Amps 11.5
Running Amps 2.3
Thermal Overload Protection YES
Rotation1CCW
Power Cable Length 9.0 ft.
(274 cm.)
Dimensions (Dia x Height) 6-1/4 in. (15.9 cm.) x 9.5 in. (24 cm.)
Dry Net Weight (Shipping) 8.5 lbs.
(3.85 Kg.)
Dry Net Weight 6.0 lbs.
(2.72 Kg.)
1 Motor Rotation - Upon start-up, the pump "kicks" in the opposite direction of motor rotation. The
correct rotation is ounterclockwise (CCW) as viewed from the impeller end of the pump.

LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19) — PAGE 9
PERFORMANCE CURVE

PAGE 10 — LITTLE SUB™ SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #0 (09/03/19)
GENERAL INFORMATION
The MQ Little Sub™ is a lightweight, portable, submersible
pump designed to move fresh water in the following
common applications: flooded rooms and roofs, fountains
and waterfalls, swimming pools and spas, simple fill-
tank requirements, and general low-flow water transfer
operations.
The Little Sub™ can discharge a very limited size and
amount of debris, and is not designed to handle chemicals,
salts, or other low pH liquids. The unit best operates with
water temperatures under 104° F.
For optimum performance and pump longevity, it is best
to always position the pump in a vertical, upright position
and ensure that the proper electricity (115V single-phase)
power is always introduced.
Always raise/lower the pump in position by attaching a rope
cord to the molded handle. NEVER use the power cord to
act as a raise/lowering device.
For discharge, the pump provides two discharge port
diameter options: 1 ¼” NPT thread or ¾” common garden
hose thread. Excessive discharge hose or pipe lengths
will affect flow and head performance (see Performance
Curve Chart).
The pump ON/OFF operations occur automatically with the
connection of the power cord to the electrical source (there
is no switch located on the pump). An optional Control Box
(model CB3) is available through MQ Sales if the operator
requires cycling the pump via the convenience of an ON/
OFF switch.
The pump provides internal overload protection if extreme
motor over-heating occurs, but this feature should not
be relied upon as a common means of operations.
Continual over-heating of the motor often caused by
improper electricity, extreme extension cord lengths and/
or incorrect extension cord gauge, operating dry, continual
operations for extended periods of time, and excessive
high temperature fluid operations will shorten the life of
the pump motor.
Performance of the Little Sub™ (Flow, Head, Velocity and
Pressure) is based upon the application givens that include:
discharge hose diameter and length, friction loss factors,
and general rise and run discharge figures. The pump
permits dewatering levels down to approximately 1/8”.
DO NOT allow the pump to run ‘dry’, or be allowed to freeze
with water still in the unit.
TOTAL DISCHARGE HEAD FLOW
PSI
VELOCITY