Powerhorse M750126B.2 User manual

Owner’s Manual
Instructions for Assembling, Testing, Operating, Servicing, and Storing
Water Pump: Outdoor agricultural product used for general
purpose water pumping, field irrigation, and trash applications.
WARNING
READ and UNDERSTAND this manual completely before using the water pump! Failure to properly set
up, operate, and maintain this water pump could result in serious injury or death from carbon monoxide
poisoning, electric shock, fire/explosion, or burns. In particular, be aware of the following hazards:
CO Poisoning
Water pumps give off carbon monoxide, a poisonous gas that can kill you. You CANNOT smell it, see it, or taste it.
•ONLY run water pump OUTDOORS and at least 20 feet from the home, away from windows, vents and air intakes, to
allow proper ventilation. If you start to feel sick, dizzy, or weak while using the water pump, shut off the engine and get
to fresh air RIGHT AWAY. NEVER run water pump inside any enclosed or semi-enclosed spaces, including homes,
basements, garages, sheds, boxes, RVs, boats or pick-up truck beds. These spaces can trap poisonous gases, EVEN if
you run a fan or open windows.
•Install carbon monoxide alarms inside nearby structures/buildings (battery-operated, or plug-in with battery backup).
Fire / Explosion
•DO NOT overload water pump (per rated capacity), and OPERATE ONLY in an area with adequate cooling ventilation
so engine does not overheat. Exhaust can be extremely hot. Keep muffler at least 7 feet from all combustible objects.
•All fuels are flammable. Never fuel a running or hot engine. Never pump fuel directly into water pump at gas station –
use approved container to transfer fuel. Ensure there are no fuel leaks, and keep sources of sparks and flames away.
•ALWAYS keep a fire extinguisher rated “ABC” nearby.
•NEVER pump flammable liquids.
STOP!
INSPECT COMPONENTS: Closely inspect to make sure no components are missing or damaged. See the “Unpacking &
Delivery Inspection” section for instructions on whom to contact to report missing or damaged parts.
ADD ENGINE OIL: Engine is shipped without oil. See engine section of this manual for instructions on capacity and
viscosity recommendations.
Any Questions, Comments, Problems, or Parts Orders
Call Powerhorse Product Support 1-866-443-2576
ITEM NUMBER: 750126
SERIAL NUMBER: _______________
M750126B.2

Hazard Signal Word Definitions
2

Table of Contents
3
About Your Water Pump ............................................................................................................ 4
Summary of Important Safety Information................................................................................5
During Assembly
During Operation
During Storage / Troubleshooting
Warning Label Locations..............................................................................................................6
Unpacking..................................................................................................................................................8
Assembly.................................................................................................................................................................. 9
Machine Components..................................................................................................................10
Operation
Operation - Preparing the Water Pump for Each Use
Step One: Inspect/Repair...................................................................................................................11
Step Two: Select a suitable site.........................................................................................................12
Step Three: Fueling.......................................................................................................................................15
Step Four: Attach a suction strainer...........................................................................................................17
Step Five: Place the water pump.................................................................................................................17
Operation - Using the Water Pump.................................................................................................18
Storage ..........................................................................................................................................20
Troubleshooting ...........................................................................................................................21
Specifications................................................................................................................................22
Water Pump Exploded View.......................................................................................................23
750126 Pump Exploded View .....................................................................................................24
Engine Exploded View.................................................................................................................25
Engine Operation/Specs ..............................................................................................................28
Engine Maintenance ....................................................................................................................29
Engine Storage .............................................................................................................................32
Limited Warranty........................................................................................................................33
California Proposition 65 Information ......................................................................................34

About Your Water Pump
4
Thank you for purchasing your Powerhorse water pump!
About Your Water Pump
This water pump is a machine designed for outdoor, agricultural, general purpose water
pumping, field irrigation and trash pumping applications.
This water pump is capable of handling suspended soft solids, up to a capacity determined by the
model.
•Up to 5/8” solids.
This water pump has an optional wheel kit (Part #109292), which includes:
•Axles
•Wheels
•Handle and Handle Mount
The technical specifications for your water pump are provided in the “Specifications” section of
this manual.
Follow all safety precautions presented throughout this manual. A summary of important safety
information can be found at the end of the manual.
Contact Powerhorse Product Support at 1-866-443-2576 for any questions
about the appropriate use of this water pump and/or optional accessories.
Warranty Registration:
Please fill in the warranty registration information found in the back of this manual and have it
on hand when you call in on a warranty claim.
Attention: All Rental Companies and Private Owners who
loan this equipment to others!
All persons to whom you rent/loan this water pump must have access to and read this manual.
Keep this owner’s manual with the water pump at all times and advise all persons who will
operate the machine to read it. You must also provide personal instruction on how to safely
operate the water pump and be available to answer any questions a renter/borrower might have.

Summary of Important Safety Information
5
WARNING
Read and understand this owner’s manual completely before using the water pump.
Improper use of the water pump could result in serious injury or illness for the operator
or nearby persons/animals, or cause damage to the environment.
LISTED BELOW is a summary of safety information of particular importance. See individual
sections of this owner’s manual for more details.
-------------------------------------- DURING ASSEMBLY -------------------------------
•CHECK and TEST completed assembly as directed in this manual. Serious injury could result from water
leaks if water pump is improperly assembled.
•DO NOT MODIFY water pump design.
------------------------------------- DURING OPERATION ------------------------------
•INSPECT and PREPARE water pump before each use as directed in this manual.
•DO NOT USE flammable or corrosive chemicals in the water pump.
•FOLLOW INSTRUCTIONS for SAFELY FUELING the engine. Gasoline is flammable and can explode.
Always use caution when handling gasoline.
•Keep a fire extinguisher rated “ABC” nearby.
•DO NOT START water pump until ready to spray in order to avoid unintentional release.
•SEE Troubleshooting section of this manual before attempting any repairs. Wear personal protective
equipment and follow safety instructions.
------------------- DURING STORAGE / TROUBLESHOOTING ------------------
•PREPARE THE WATER PUMP FOR STORAGE according to the instructions in this manual.
•SELECT a well-ventilated STORAGE AREA away from sources of heat, flame, or sparks. Gasoline
vapors can ignite and cause a fire.
•READ and FOLLOW the safety rules for troubleshooting / servicing the water pump to avoid accidental
exposure to chemical and risk of electric shock.

Warning Label Location
6
Ref. #
Part #
Description
Qty.
1
795296
CPSC Decal
1
2
790852
Burn Hazard Decal
2
3
785261
Priming Warning
1
4
795295
Warning Decal
1
5
782629
Oil Fill Decal
1
6
795123
Fuel Overfill Decal
1
7
793048
Air Filter Decal
1
8
N/A
EPA Decal
1
9
795119
Choke / Run Decal
1
10
795124
Ethanol Decal
1
11
795299
Name Plate
1
12
795349
On/Off Fuel Shut Off Decal
1
13
795289
Powerhorse Recoil Decal
1
14
795333
Powerhorse decal
1
15
795336
Semi-Trash Pump Decal
1
16
795294
Throttle
1

Warning Label Location
7
4
3
5
6
2
1
10
9
12
13
15
7
8
14
11

Unpacking
8
Closely inspect all contents in the shipping carton.
Note that some parts are shipped inside the manual bag.
•If you are missing or have damaged components: Contact Product Support at 1-866-443-2576.
The following items are found in the manual bag.
FIG05940
Nut (2)
Gasket (2)
Hose Barb (2)
Hose Clamp (3)
Strainer (1)
Spark Plug
Wrench (1)
Funnel (1)

Assembly
9
Attach Hoses to discharge fitting and suction fitting.
Connect hoses (not supplied) to the discharge and suction hose barbs.
Rubber Gasket
Hose Barb
Discharge Fitting
Nut
Suction Fitting
Discharge Hose Barb
Suction Hose Barb

Machine Components
10
1. Prime Port: Fill the priming port to prime the pump.
2. Discharge Fitting: Connect the discharge hose to the discharge fitting.
3. Pump: The pump moves the liquid.
4. Suction Fitting: Connect the suction hose to the suction fitting.
5. Drain Port: Drain the liquid in the pump through the drain port.
6. Engine: The air-cooled engine powers the pump.

Operation –Preparing the Water Pump for Each Use
11
Step One: Inspect/Repair
If the water pump has been used previously, it must be prepared BEFORE EACH SUBSEQUENT USE.
WARNING
Read instructions below carefully for inspecting and preparing the water pump.
Damaged or clogged equipment could result in leaks or uncontrolled spray.
Important safety rules:
•Turn off engine. Turn off engine and remove spark plug cap before cleaning, inspecting, or
servicing the water pump.
•Guards / shields. Make sure all guards and shields are replaced after servicing the water pump.
•Replacement parts. If a part needs replacement, only use parts that meet the manufacturer’s
specifications. Replacement parts that do not meet specifications may result in a safety hazard or
poor operation of the water pump.
1. Ensure water pump
casing is empty
Ensure the water pump has been thoroughly flushed with fresh
water and drained from prior use.
2. Clean suction strainer
Clean the suction strainer of any material residue.
It is important to clean the suction strainer of debris before each use, to
ensure it is not clogged.
3. Inspect & repair
Inspect and test the water pump thoroughly.
a. Inspect fittings for cracks and leaks. Replace all damaged fittings
with original Powerhorse parts.
b. Check to be sure all nuts, bolts, and screws are tight.
c. Check oil level in engine. See engine section of this manual.
d. Check for fuel leaks. Any fuel leak is a fire hazard. Fix any fuel
leaks before starting engine.

Operation –Preparing the Water Pump for Each Use
12
Step Two: Select a Suitable Site
WARNING
Choose a suitable site for operating your water pump to avoid equipment damage and/or injury and
possible death from carbon monoxide poisoning, electric shock, or fire. Choose a site that meets all of
the criteria specified.
Important safety rules:
•Select a suitable site. Before using the water pump, you must select a suitable OUTDOOR
location for installation and operation. This location should meet all of the criteria listed below.
1. Level surface
The water pump should be positioned on a firm and level surface.
Ensure that the water pump sits level and will not slide or shift during
operation. If applicable, block the water pump’s wheels to prevent
sliding and shifting.
Uneven ground can cause the engine oil level sensor to detect a low oil
condition and stop the engine.
2. Outdoors only
Follow the directions below for choosing a location to
operate your water pump in order to avoid carbon monoxide
poisoning:
a. The location you choose to operate the water pump must be
OUTDOORS and at least 20 feet from the home, away from
windows, vents and air intakes, to allow proper ventilation. If you
start to feel sick, dizzy, or weak while using the water pump, shut
off the engine and get to fresh air RIGHT AWAY.
b. Never run the water pump inside any closed or semi-enclosed
spaces (even if outdoors), including homes, garages, basements,
sheds, or boxes. These spaces can trap poisonous gases, even if
you run a fan or open windows.
c. Never place the water pump immediately adjacent to a building or
other structures –allow at least 20 feet clearance.
WARNING: Carbon monoxide poisoning hazard
The exhaust from your water pump contains carbon
monoxide (CO), a poisonous gas that can kill. You
cannot smell it, see it, or taste it. Carbon monoxide
exhaust is given off whether you are using gasoline,
natural gas, or propane as the fuel source to power the
water pump.

Operation –Preparing the Water Pump for Each Use
13
2. Outdoors only
3. Adequate cooling
4. Hot exhaust clearance
d. Place the water pump so that the muffler exhaust fumes will not be
directed towards people or building air intakes.
e. Ensure that working, battery-operated or battery back-up carbon
monoxide alarms are used in any dwelling/structure that is in close
proximity to the running water pump.
WARNING:
Never attempt to attach ductwork to the muffler system to
allow for installation inside an enclosure. This could
cause hot air deflection, heat build-up, and increased
exhaust back-pressure, resulting in possible exhaust
leakage or damage to the water pump.
The water pump needs adequate, unobstructed flow of air to allow
for proper cooling of the engine and fuel tank. Follow the directions
below:
a. Position so there is adequate clearance around water pump to
allow for cooling airflow so that heat does not build up.
b. Never place the water pump immediately adjacent to large objects
or structures –allow at least a 7’ clearance.
c. Do not run the water pump in close proximity to other heat-
generating equipment, such as generators or other engine powered
equipment. The combined heat that is generated may raise air
temperature in the immediate area and there will not be adequate
cooling ventilation.
d. Do not allow debris to accumulate and block airflow to engine.
e. Do not operate with a tarp, blanket, or cover surrounding the water
pump.
The exhaust gas from your water pump is extremely hot and can
cause combustible materials to catch on fire.
a. Make sure your water pump’s exhaust system is at least 7
feet from all combustible materials and structures.
b. Keep a fire extinguisher rated “ABC” nearby. Keep it
properly charged and be familiar with its use.

Operation –Preparing the Water Pump for Each Use
14
5. Hearing protection
The water pump can produce noise levels in excess of up to 95 dB in close
proximity, which can be dangerous to human hearing with prolonged
exposure.
WARNING:
Never attempt to attach ductwork to the muffler system to
lower noise levels. This could cause hot air deflection,
heat build-up, and increased exhaust back-pressure,
resulting in possible exhaust leakage or damage to the
water pump engine.

Operation –Preparing the Water Pump for Each Use
15
Step Three: Fueling
WARNING
Gasoline is highly flammable and explosive. You can be burned or seriously injured when handling
fuel. Use extreme care when handling gasoline.
1. Engine off / cool
The engine must be off and allowed to cool at least two minutes before adding
fuel.
WARNING: A running engine is hot enough to ignite fuel. Never add fuel
or remove gas cap if engine is running or still hot.
2. Outdoor location
Fill fuel tank outdoors –never indoors.
WARNING: Gasoline vapors can ignite if they collect inside an enclosure.
Explosion can result.
3. Check engine oil
level
Check engine oil level as specified in the engine section of this manual.
4. Remove gas cap
Remove engine gas cap.
5. Add gasoline
Add gasoline through fill opening from a UL-approved container.
Important Safety Instructions:
•Use approved container. NEVER pump fuel directly
into engine at gas station. Static charge can build and
ignite fuel. Use a UL approved fuel container to
transfer gas to the engine.
•Don’t overfill. DO NOT overfill the gas tank. Allow
at least 1/2” of empty space below the fill neck to allow
for fuel expansion
•Heat / flames / sparks. Stay away from sources of
heat, flame, or sparks while adding fuel.
6. Spills / splashes
Clean up fuel spills /splashes immediately.
Move water pump away from spilled fuel on the ground.
1. Wipe fuel off engine and wait 5 minutes for excess fuel to evaporate before
starting engine.
2. Gas soaked rags are flammable and should be disposed of properly.
3. If gasoline is spilled on your skin or clothes, change clothes and wash skin
immediately.
7. Replace gas cap
Replace gas cap securely before starting engine.
8. Gasoline storage
Store gasoline in a cool, dry place in a UL approved, tightly sealed container.

Operation –Preparing the Water Pump for Each Use
16
Static electricity and filling the gasoline tank:
Static electricity can initiate from ungrounded gasoline tanks or containers, from flowing gasoline,
and from persons carrying a static electric charge
Static electricity can explosively ignite gasoline vapors that are present during the fueling process,
resulting in serious burns to nearby persons. To avoid static electricity while fueling, certain steps must
be followed before and during the fueling process in order to minimize and safely dissipate static charge
build-up:
•Touch a grounded metal object before starting. Always dissipate static charge from your body
before beginning the fueling process by touching a grounded metal object at a safe distance away
from fuel sources.
•Use a portable container to fill tank. Never fill the water pumps gas tank directly from the fuel
pump –the water pumps tank is not grounded and the high velocity flow of gasoline from a fuel
pump can cause static electric build-up. Use an approved portable container to transfer gasoline to
the water pumps tank.
•Fill container on the ground. Never fill the portable gas container while it is sitting inside a
vehicle, trailer, trunk, or pick-up truck bed. ALWAYS place container on the ground to be filled.
•Keep nozzle in contact with container. Keep nozzle in contact with the portable container at all
times while filling. Manually control the flow of gasoline; do NOT use the nozzle’s lock-open
device.
•Use a portable container made of metal or conductive plastic. It will dissipate charge to ground
more readily.
About static electricity and fueling
Many common objects can accumulate and retain a static electric charge. Objects made of non-
conductive materials (e.g. plastics) easily accumulate and retain static electric charge, as can objects made
of conductive material (e.g. metal, water) if they are not electrically grounded. The static electric charge
on an object, such as a human body or plastic fuel tank/container, can reach as high as several thousand
volts!
A static electric spark can be generated if the static electric charge stored on an object “jumps” to another,
less charged object. Such a spark can ignite invisible gasoline vapors that are present during fueling
situations.
Typical sources of static electric hazards during fueling
The following objects can accumulate a static electric charge and cause an ignition spark in typical
fueling situations:
1) Ungrounded tanks/containers. Any ungrounded fuel tank or container can accumulate a static electric
charge as a result of contact with other objects or friction during transportation. This static electricity
can discharge as a spark to the grounded gasoline dispenser nozzle, as the nozzle is first brought close
to the tank/container at the beginning of the fueling process.
2) Flowing gasoline. Most people are not aware that gasoline accumulates static electric charge while
flowing through a hose or pipe. This charge then transfers to and accumulates in the gas tank or
container that is being filled. The total amount of charge accumulation depends on the amount of gas
pumped into the container, the speed with which it is pumped, and whether or not the tank/container
is grounded. If sufficient static electric charge accumulates in the fuel tank or container during the
fueling process, the tank/container may discharge a spark to the grounded gasoline dispenser nozzle.
3) Persons. A person dispensing the gasoline can carry a static electric charge on their body, typically
resulting from contact with their car seat or electronics. The static electricity can discharge as a spark
between that person’s hand and either the grounded dispenser nozzle or the fuel tank opening.

Operation –Preparing the Water Pump for Each Use
17
Step Four: Attach a suction strainer
WARNING
This pump is design to pump water only. Never use the water pump to pump flammable liquids.
1. Attach suction
strainer
A suction strainer should be attached to the suction hose. A suction strainer has
holes or slots small enough to prevent large debris from working through and
damaging the pump.
2. Keep the strainer
clean
Keep the strainer clean.
If possible, suspend the strainer to keep it from working into sediment.
-OR-
A) Prepare a bed of large stones on which the strainer will rest.
B) Tie the strainer inside a basket or pail.
Step Five: Place the water pump
1. Place the water
pump near liquid
surface
Place the water pump in a location as near to the liquid surface as possible, this will
ensure proper pump suction.
All hoses must be kept as straight as possible, avoid sharp bends.
NOTE: 23ft is the maximum height of suction head.
2. Use flexible hose
Use at least 12” of flexible hose to make plumbing connections to the pump body.
Rigid piping may put stresses on the pump, causing damage.
3. Place unit on
secure footing
Always be sure the unit is on a secure footing. Keep the immediate pump area free
of all unauthorized personnel. If the water pump is sitting beside a pit, be sure it is
well anchored so that it does not fall in.
4. Do not run the
pump dry
Do not run the pump dry. Always fill the pump body with water before starting. It
is not necessary to drain the pump body after each use, unless there is danger of
freezing, settling of solids, or crystallization.
5. Fill the pump
with water
Fill the pump with water utilizing the priming port on the top of the pump.
(The pump self primes only when it is first filled with priming water.)
All hoses and pipe connections must be airtight.

Operation –Using the Water Pump
18
Operate the water pump
1. Review safety
information
Review the “Operation – Important Safety Information” provided in this manual.
2. Priming
Using the priming port on the top of the pump, completely fill the pump chamber
with water before starting the engine.
3. Engine operation
precautions
Heed the following safety rules with regard to running the water pump engine:
•Hot muffler. If you are starting a warm engine, stay clear of muffler. It may still
be hot enough to burn you.
•Hot exhaust. Hot exhaust fumes from engine can cause fire. Position muffler at
least 7’ from combustible objects during operation.
•Fire extinguisher. Have a Class ABC fire extinguisher available as a
precautionary measure when operating the water pump engine in dry areas.
•Carbon monoxide. The running engine gives off carbon monoxide, a poisonous
gas that can kill you. You CANNOT smell it, see it, or taste it. ONLY run the
water pump engine OUTDOORS and away from air intakes. NEVER run the
water pump engine inside homes, garages, sheds, or other semi-enclosed spaces.
These spaces can trap poisonous gases, EVEN if you run a fan or open windows.
If you start to feel sick, dizzy, or weak while using the water pump, shut off the
engine and get to fresh air RIGHT AWAY. See a doctor. You may have carbon
monoxide poisoning.

Operation –Using the Water Pump
19
4. Start engine
To start the engine:
1) Turn the gasoline line valve to the ON position.
2) For cold engine, move choke lever to full choke position. To restart a warm
engine, move choke lever to half choke or to RUN position.
3) Start the engine:
a) Using recoil start –
i) Turn the engine switch to the ON position.
ii) Pull the starter grip lightly until you feel resistance, then pull the starter
cord out briskly and rapidly.
iii) Allow starter cord to return slowly.
5) When engine starts, move choke lever to RUN position.
6) Under long, continuous-run operating conditions, be prepared to:
a) Check and refuel the engine on a regular basis.
WARNING:
A running engine is hot enough to ignite fuel. Never add
fuel or remove gas cap if engine is running or still hot. Let
cool at least 2 minutes.
b) Check engine oil level each time you refuel.
c) Change oil after the first 20 operating hours, and at least every 100 operating
hours thereafter, as directed in the engine section of this manual.
WARNING:
Never open oil port while engine is running. Hot oil can
spray over face and body.
5. Throttle control
When operating the water pump much higher than the water surface, you may need
to speed up the engine, using the throttle. When the pump is near the water surface,
a slower engine speed can be used. This will save engine fuel and life.
6. Secure flexible
hose
Never allow a vehicle to run over the flexible hose. This sudden shut off pressure
can cause “hydraulic shock”.
If your flexible hose must be laid across a high traffic area, it is advised to protect the
flexible hose with planking.
7. Keep pump
from freezing
Never allow water to freeze in the pump. Freezing water can be extremely
dangerous to the pump, always drain the water from the pump if freezing
temperatures are a factor.
8. Flush the pump
Flush the pump with fresh water after each use is advised. Some liquids being
pumped may leave a solid or sticky residue. This may shorten the life of your pump.

Storage
20
Prepare the water pump for end-of-season storage by running pure water through the system. This will
flush out any contaminants and clean the water pump internals. After the water pump has been flushed
with pure water, completely drain the water pump of all water to protect from freezing.
WARNING
Gasoline vapors can ignite and cause a fire. Select a well-ventilated storage area away
from sources of heat, flame, or sparks.
CAUTION
The water pump will be damaged if it freezes.
Protect the water pump from freezing during storage by following the instructions below.
Preparing for storage:
1. Pump pure
water
Briefly run the water pump while pumping pure water.
2. Drain the
water pump
Using the water pump drain plug, drain the water pump completely of water to
prevent freezing.
3. Engine
storage
Refer to the engine section of this manual for proper engine storage instructions.
- Always disable the engine for storage by unplugging the spark plug wire.
CAUTION: Gasoline will oxidize and deteriorate in storage. Old gasoline in the
engine will cause hard starting and leave gum deposits that can clog the fuel
system. Deterioration problems may occur within a few months, or even less if
gasoline was not fresh when you filled the fuel tank.
Short-Term Storage:
Consider adding a fuel stabilizer to extend fuel storage life.
Long Term Storage: (between infrequent uses and at end of season)
Drain the fuel tank and carburetor as instructed in the engine section of this manual.
Important Safety Instructions:
•Always drain fuel from tank in outdoor, well-ventilated area.
•Stay away from sources of heat, flame, or sparks while handling fuel.
•Clean up fuel spills/splashes immediately.
4. Water pump
storage
location
Store the water pump in a location away from corrosive material, sources of
heat, open flames, sparks or pilot lights.
WARNING: Never store water pump inside where there is a source of heat or
an open flame, spark, or pilot light as on water heaters, space heaters, furnaces,
clothes dryers, or other gas appliances EVEN IF the water pump’s gas tank is
empty.
5. Gasoline
storage
Store gasoline in a cool, dry place in a UL approved, tightly sealed container.
WARNING:Gasoline vapors can ignite if they collect inside an enclosure and
an explosion can result.