MULTIQUIP QP2H Guide

THIS MANUAL MUST ACCOMPANYTHE EQUIPMENT AT ALLTIMES.
To find the latest revision of this
publication, visit our website at:
www.multiquip.com
OPERATION AND PARTS MANUAL
MODEL QP2H
CENTRIFUGAL PUMP
(HONDA GX120U1PX2 GASOLINE ENGINE)
Revision #0 (08/04/08)

PAGE 2 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
PROPOSITION 65 WARNING

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 3
NOTES

PAGE 4 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
TABLE OF CONTENTS
QP2H Centrifugal Pump
Proposition 65 Warning ........................................... 2
Table of Contents .................................................... 4
Parts Ordering Procedures ..................................... 5
Safety Information ................................................ 6-9
Specifications/Dimensions (Pump) ....................... 10
Specifications/Dimensions (Engine) ..................... 11
General Information .............................................. 12
Pump Components ............................................... 13
Basic Engine ......................................................... 14
Inspection (Engine) ............................................... 16
Set-Up ................................................................... 17
Operation ......................................................... 18-19
Maintenance (Pump) ....................................... 20-21
Maintenance (Engine) ...................................... 22-23
Storage ................................................................. 24
Troubleshooting (Engine) ................................. 25-26
Troubleshooting (Pump)........................................ 26
Explanation of Code in Remarks Column ............. 28
Suggested Spare Parts ......................................... 29
Component Drawings
Pump Assembly ............................................... 30-31
Honda GX120U1PX2 Engine
Air Cleaner (Dual) Assembly ............................ 32-33
Camshaft Assembly ......................................... 34-35
Carburetor Assembly ....................................... 36-37
Control Assembly ............................................. 38-39
Crankcase Cover Assembly ............................. 40-41
Crankshaft Assembly ....................................... 42-43
Cylinder Barrel Assembly ................................. 44-45
Cylinder Head Assembly .................................. 46-47
Fan Cover Assembly ........................................ 48-49
Flywheel Assembly .......................................... 50-51
Fuel Tank Assembly ......................................... 52-53
Ignition Coil Assembly ...................................... 54-55
Muffler Assembly ............................................. 56-57
Piston Assembly ............................................... 58-59
Recoil Starter Assembly................................... 60-61
Gasket Assembly ............................................. 62-63
Labels Assembly .............................................. 64-65
Terms and Conditions of Sale — Parts ................. 66
Specifications and part numbers are subject
to change without notice.

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 5
PARTS ORDERING PROCEDURES
www.multiquip.com
Ordering parts has never been easier!
Choose from three easy options:
WE ACCEPT ALL MAJOR CREDIT CARDS!
When ordering parts, please supply:
❒❒
❒❒
❒
Dealer Account Number
❒❒
❒❒
❒ Dealer Name and Address
❒❒
❒❒
❒ Shipping Address (if different than billing address)
❒❒
❒❒
❒ Return Fax Number
❒❒
❒❒
❒ Applicable Model Number
❒❒
❒❒
❒ Quantity, Part Number and Description of Each Part
❒❒
❒❒
❒ Specify Preferred Method of Shipment:
✓ UPS/Fed Ex ✓DHL
■ Priority One ✓ Tr u ck
■ Ground
■Next Day
■ Second/Third Day
All orders are treated as Standard Orders
and will ship the same day if received prior
to 3PM PST.
If you have an MQ Account, to obtain a
Username and Password, E-mail us at:
[email protected].
To obtain an MQ Account, contact you
r
District Sales Manager for more information.
Order via Internet (Dealers Only):
Order parts on-line using Multiquip’s SmartEquip website!
■ View Parts Diagrams
■ Order Parts
■ Print Specification Information
Note: Discounts Are Subject To Change
Goto www.multiquip.com and click on
Order Parts to log in and save!
Use the internet and qualify for a 5% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Fax (Dealers Only):
All customers are welcome to order parts via Fax.
Domestic (US) Customers dial:
1-800-6-PARTS-7 (800-672-7877)
Fax your order in and qualify for a 2% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Phone: Domestic (US) Dealers Call:
1-800-427-1244
Best Deal!
International Customers should contact
their local Multiquip Representatives for
Parts Ordering information.
Non-Dealer Customers:
Contact your local Multiquip Dealer for
parts or call 800-427-1244 for help in
locating a dealer near you.
Note: Discounts Are Subject To Change
Effective:
January 1st, 2006

PAGE 6 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
SAFETY INFORMATION
FOR YOUR SAFETY AND SAFETY OF OTHERS!
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.
This manual has been developed to
provide complete instructions for the
safe and efficient operation of this
equipment. Refer to the engine
manufacturer’s instructions for data
relative to its safe operation.
Before using this equipment ensure that the operating
individual has read and understood all instructions in this
manual.
SAFETY MESSAGES
The three 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 three
words: DANGER, WARNING or CAUTION.
HAZARD SYMBOLS
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.
DANGER
You WILL be KILLED or SERIOUSLY INJURED if you
DO NOT follow these directions.
WARNING
You CAN be KILLED or
SERIOUSLY INJURED if you
DO NOT follow these directions.
CAUTION
You CAN be
INJURED if you DO NOT follow these
directions.

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 7
■ NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to cool
before servicing engine or pump. Never
operate the engine with heat shields or
guards removed.
■ ALWAYS allow the engine to cool before adding fuel o
r
performing service and maintenance functions. Contact
with
hot components can cause serious burns.
■ NEVER operate this equipment in any enclosed o
r
narrow area where free flow of the air is restricted. The
engine of this equipment requires an adequate free flo
w
of cooling air. If the air flow is restricted it will cause
serious damage to the
equipment or engine and
may cause injury to people
and property.The engine fuel
exhaust gases contain
poisonous carbon monoxide.
This gas is colorless and
odorless, and can cause
death if inhaled.
■ ALWAYS refuel in a well-ventilated area, away from
sparks and open flames. DO NOT fill the fuel tank while
the engine is running or hot. DO NOT overfill tank, since
spilled fuel could ignite if it comes into contact with hot
engine parts or sparks from the ignition system. Store
fuel in approved containers.
■ ALWAYS use extreme caution when working with
flammable liquids.When refueling, stop the engine and
allow it to cool.
■ DO NOT smoke around or near the
equipment. Fire or explosion could result
from fuel vapors, or if fuel is spilled on a hot
engine.
■ 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.
■ 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.
GENERAL SAFETY
■ DO NOT operate or service this equipment
before reading the entire manual. The
equipment is to be operated by trained and
qualified personnel only! The equipment is
for industrial use only.
■ This equipment should not be operated by persons under
18 years of age.
■ 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.
■ 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.
■ 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.
■ 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.
■ Manufacturer does not assume responsibility for any
accident due to equipment modifications. Unauthorized
equipment modification will void all warranties.
■ Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.
■ ALWAYS check the equipment for loosened threads or
bolts before starting.
■ ALWAYS replace any worn or damaged warning decals.
SAFETY INFORMATION

PAGE 8 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
SAFETY INFORMATION
■ NEVER run engine without air cleaner. Severe engine
damage may occur.
■ ALWAYS ensure pump is on level ground before use.
■ NEVER pump volatile, explosive,
flammable or low flash point fluids.
These fluids could ignite or explode.
NEVER pump corrosive chemicals or
water containing toxic substances.
These fluids could create serious health
and environmental hazards. Contact
local authorities for assistance.
■ NEVER open the priming plug when pump is hot. Hot
water inside could be pressurized much like the radiator
of an automobile. Allow pump to cool to the touch before
loosening plug.The possibility exists of scalding, resulting
in severe bodily harm.
■ NEVER block or restrict flow from discharge hose.
Remove kinks from discharge line before starting pump.
Operation with a blocked discharge line can cause water
inside pump to overheat.
■ ALWAYS fill the pump casing with water before starting
the engine. Failure to maintain water inside the pump
housing will cause severe damage to the pump and
mechanical seal.
■ In winter drain water from pump housing to prevent
freezing.
■ NEVER tamper with the factory setting of
the engine governor. Personal injury and
equipment damage can result if operating
in speed ranges above the maximum
allowable.
LOADING AND UNLOADING
■ Before lifting, make sure that equipment parts (hook and
vibration insulator) are not damaged and screws are not
loosened or lost.
■ ALWAYS make sure crane or lifting device has been
properly secured to the lifting bail (hook) of the
equipment.
■ NEVER lift the equipment while the engine is running.
■ Use adequate lifting cable (wire or rope) of sufficient
strength.
■ Use one point suspension hook and lift straight upwards.
■ NEVER allow any person or animal to stand underneath
the equipment while lifting.
■ DO NOT lift machine to unnecessary heights.
TRANSPORTING
 ALWAYS shutdown engine before transporting.
 Tighten fuel tank cap securely and close fuel cock to
prevent fuel from spilling.
 ALWAYS tie down the equipment during transport by
securing the equipment with rope.

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 9
SAFETY INFORMATION
REFUELING
MAINTENANCE SAFETY
■ NEVER lubricate components or attempt service on a
running machine.
■ ALWAYS allow the machine a proper amount of time to
cool before servicing.
■ Keep the equipment in proper running condition.
■ Fix damage to the equipment immediately and always
replace broken parts.
■ Dispose of hazardous waste properly. Examples of
potentially hazardous waste are used motor oil, fuel and
fuel filters.
■ DO NOT use food or plastic containers to dispose of
hazardous waste.
■ DO NOT pour waste, oil or fuel directly onto the ground,
down a drain or into any water source.
EMERGENCIES
■ ALWAYS know the location of the nearest
fire extinguisher .
■ ALWAYS know the location of the nearest
first aid kit .
■ In emergencies, 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 case of emergency.

PAGE 10 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
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SPECIFICATIONS/DIMENSIONS (PUMP)
Figure 1. QP2H Dimensions

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 11
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SPECIFICATIONS/DIMENSIONS (ENGINE)

PAGE 12 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
APPLICATION
The QP2H Centrifugal Pump is designed to handle all
types of clear water applications. It is ideal for residential
use such as dewatering basements and swimming pools.
Both the suction and discharge ports on the QP2H pump
use a 2-inch diameter opening, which allows the pump to
pump at a rate of approximately 158 gallons/minute (gpm)
or 600 liters/minute (lpm).
Centrifugal or self priming pumps are designed to purge air
from the suction line and create a partial vacuum in the
pump body. The reduced atmospheric pressure inside the
pump allows water to flow through the suction line and into
the pump body.The centrifugal force created by the rotating
impeller pressurizes the water and expels it from the pump.
Power Plant
This centrifugal pump is powered by a 4.0 horsepower air
cooled 4-stroke, single cylinder HONDA GX-120 gasoline
engine that incorporates a low “ Oil Alert Feature. ”
Oil Alert Feature
In the event of low oil or no oil , the HONDA GX-120 engine
has a built-in oil alarm engine shut-down feature. In the
event the oil level is low the engine will automatically shut-
down.
Standard Centrifugal Pump
Standard centrifugal pumps provide an economical choice
for general purpose dewatering. These types of pumps
should only be used in clear water applications (agricultural,
industrial, residential) as they have a limited solid handling
capability of only 10% by volume.
Suction Lift
This pump is intended to be used for dewatering
applications and is capable of suction lifts up to 25 feet at
sea level. For optimal suction lift performance keep the
suction hose or line as short as possible. In general, always
place the pump as close to the water as possible.
Pump Support
The pump should always be placed on solid stationary
ground , on a level position.
NEVER place the pump on soft soil . The suction hose or
pipe connection should always be checked for tightness
and leaks. A small suction leak in the hose or fittings could
prevent the pump from priming.
Elevation
Higher elevations will effect the performance of the pump.
Due to less atmospheric pressure at higher altitudes, pumps
DO NOT have the priming ability that they have at sea
level. This is due to the “thinner air” or lack of oxygen at
higher altitudes.
A general rule of thumb is that for every 1,000 feet of
elevation above sea level a pump will lose one foot of
priming ability.
For example, in Flagstaff, Arizona where the elevation is
approximately 7,000 feet, the pump would have a suction
lift of only 18 feet rather than the 25 feet at sea level. Table
3 shows suction lift at various elevations.
Table 4 shows percentage drops in performance as elevation
increases.
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GENERAL INFORMATION

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 13
Figure 2 shows a typical application using the QP2H centrifugal pump. Please note that this pump is intended for the
removal of clean water.
PUMP COMPONENTS
Figure 2. QP2H Pump Application
1. Pump – The QP2H is 2-inch centrifugal pump used in
general de-watering applications. Typical dewatering
applications consist of dewatering basements and
swimming pools.
2. Fill Cap – Prior to operation, the pump casing should
be filled with water. Remove this cap to add water to
the pump. After the initial prime, a sufficient amount of
water will be retained in the casing so that the operator
will not need to re-prime later.
If the casing is dry or has insufficient water, the pump
will have difficulty in priming which could lead to
premature mechanical seal wear thus causing damage
to the pump.
3. Discharge Port – Connect a 2-inch discharge hose to
this port.
4. Worm Clamp – Used to secure the hose to the inlet
and outlet ports on the pump. Use two clamps to secure
the hose on the inlet side of the pump.
5. Discharge Hose – Connect this flexible rubber hose
to the discharge port on the pump. Make sure that the
hose lays flat and is not kinked. Use only recommended
type discharge hose. Contact Multiquip parts
department for ordering information.
6. Suction Port – Connect a 2-inch inlet hose to this
port. Use two worm clamps to secure the hose.
7. Suction Hose – Connect this flexible rubber hose to
the suction port on the pump. Make sure that the hose
lays flat and is not kinked. Use only recommended
type suction hose. Contact Multiquip parts department
for ordering information.
8. Drain Plug – Remove this plug to drain water from the
pump.
9. Strainer – Always attach a strainer to bottom side of
the suction hose to prevent large objects and debris
from entering the pump. Strainer should be positioned
so that it will remain completely under water. Running
the pump with the strainer above water for long periods
can damage pump.

PAGE 14 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
BASIC ENGINE
INITIAL SERVICING
The engine (Figure 4) must be checked for proper lubrication
and filled with fuel prior to operation. Refer to the
manufacturers engine manual for instructions and details
of operation and servicing. The engine shown above is a
HONDA engine, operation for other types of engines may
vary somewhat.
1. Fuel Filler Cap – Remove this cap to add unleaded
gasoline to the fuel tank. Make sure cap is tightened
securely. DO NOT over fill.
Operating the engine without an air filter, with
a damaged air filter, or a filter in need of
replacement will allow dirt to enter the
engine, causing rapid engine wear.
DANGER — Fueling the Engine
Adding fuel to the tank should be done only
when the engine is stopped and has had an
opportunity to cool down. In the event of a
fuel spill, DO NOT attempt to start the engine
until the fuel residue has been completely
wiped up, and the area surrounding the engine is dry. Fuel
is extremely flammable, and its vapors can cause an
explosion if ignited. DO NOT smoke while refueling.
CAUTION — Burn Hazard
Engine components can generate extreme
heat.To prevent burns, DO NOT touch these
areas while the engine is running or
immediately after operating. NEVER operate
the engine with the muffler removed.
8. Spark Plug – Provides spark to the ignition system. Set
spark plug gap to 0.6 - 0.7 mm (0.028 - 0.031 inch) Clean
spark plug once a week.
9. Muffler – Used to reduce noise and emissions.
10. Fuel Tank – Holds unleaded gasoline. For additional
information refer to engine owner's manual.
2. Throttle Lever – Used to adjust engine RPM speed (lever
advanced forward SLOW , lever back toward operator
FAST ).
3. Engine ON/OFF Switch – ON position permits engine
starting, OFF position stops engine operations.
4. Recoil Starter (pull rope) – Manual-starting method.Pull
the starter grip until resistance is felt, then pull briskly and
smoothly.
5. Fuel Valve Lever – OPEN to let fuel flow, CLOSE to stop
the flow of fuel.
6. Choke Lever – Used in the starting of a cold engine, or in
cold weather conditions. The choke enriches the fuel
mixture.
7. Air Cleaner – Prevents dirt and other debris from entering
the fuel system. Remove wing-nut on top of air filter
cannister to gain access to filter element.
Figure 4. Engine Controls and Components

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 15
NOTES

PAGE 16 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
INSPECTION (ENGINE)
INSPECTION (ENGINE)
1. Clean the pump, removing dirt and dust, particularly
the engine cooling air inlet, carburetor and air cleaner.
2. Check the air filter for dirt and dust. If air filter is dirty,
replace air filter with a new one as required.
3. Check carburetor for external dirt and dust. Clean with
dry compressed air.
4. Check fastening nuts and bolts for tightness.
Engine Oil Check
1. To check the engine oil level, place the pump on secure
level ground with the engine stopped.
2. Remove the filler dipstick from the engine oil filler hole
(Figure 5) and wipe clean.
Figure 5. Engine Oil Dipstick (Removal)
Figure 6. Engine Oil Dipstick (Oil Level)
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3. Insert and remove the dipstick without screwing it into
the filler neck. Check the oil level shown on the dipstick.
4. If the oil level is low (Figure 6), fill to the edge of the oil
filler hole with the recommended oil type (Table 5).
Maximum oil capacity is 0.63 quarts (0.60 liters).
Fuel Check
1. Remove the gasoline cap located on top of fuel tank.
2. Visually inspect to see if the fuel level is low. If fuel is
low, replenish with unleaded fuel.
3. When refueling, be sure to use a strainer for filtration.
DO NOT top-off fuel. Wipe up any spilled fuel
immediately!
CAUTION — Read Manual
DO NOT attempt to operate the pump until
the Safety Information, General Information
and Inspection sections of this manual have
been
read and thoroughly understood .

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 17
SET-UP
SET-UP
1. Place pump as near to water as possible, on a firm
flat, level surface.
2. To prime pump, remove fill cap (Figure 2) and fill pump
casing with water. If the pump casing is not filled with
water before starting, it will not begin pumping.
3. Attach suction and discharge hoses to the pump. Check
that all hoses are securely attached to the pump. Make
certain suction hose (Figure 2) does not have any air
leakage. Tighten hose clamps and couplings as
required.
4. It is recommended that 2 clamps be used when
securing the suction hose to the inlet side (suction) of
the pump.
5. Remember suction hoses must be rigid enough not to
collapse when the pump is in operation.
6. Check that the discharge hose (Figure 2) is not
restricted. Place hose so that it lays as straight as it is
possible on the ground. Remove any twists or sharp
bends from hose which may block the flow of water.
CAUTION — Strainer
The strainer should be positioned so it will remain completely
under water . Running the pump with the strainer above
water for long periods can damage the pump.
Suction and discharge hoses are available
from Multiquip. Contact your nearest dealer
for more information.
7. The discharge hose is usually a collapsible (thin-
walled) hose, however if a thin-walled discharge hose
is not available, a rigid suction hose can be substituted
in its place.
8. Make sure the suction strainer (Figure 2) is clean and
securely attached to the water end of the suction hose.
The strainer is designed to protect the pump by preventing
large objects from being pulled into the pump.

PAGE 18 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
OPERATION
STARTINGTHE ENGINE
Figure 8. Throttle Lever (1/3 Start Position)
Figure 10. Engine Choke Lever (Open)
Figure 11. Engine ON/OFF Switch (ON Position)
1. Place the engine fuel valve lever (Figure 7) to the ON
position.
2. Move the throttle lever (Figure 8) away from the slow
position, about 1/3 of the way toward the fast position.
Figure 12. Starter Grip
Figure 7. Engine Fuel Valve Lever (ON Position)
CAUTION — Pump Priming
DO NOT attempt to start the engine unless the pump
has previously been primed with water. Severe pump
damage will occur if pump has not been primed.
Figure 9. Engine Choke Lever (Closed)
3. Place the choke lever (Figure 9) in the CLOSED position
if starting a cold engine.
4. Place the choke lever (Figure 10) in the OPEN position
if starting a warm engine or the temperature is warm.
5. Place the engine ON/OFF switch (Figure 11) in the ON
position.
6. Grasp the starter grip (Figure 12) and slowly pull it out.
The resistance becomes the hardest at a certain position,
corresponding to the compression point. Pull the starter
grip briskly and smoothly for starting.
7. If the engine has started, and the choke lever was moved to
the CLOSED position to start the engine, gradually move the
choke lever lever to the OPEN position as the engine warms
up.If the engine has not started repeat steps 1 through 6.

QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08) — PAGE 19
Figure 13. Choke Lever (Open)
Figure 14. Throttle Lever (Run)
CAUTION — Maximum Engine Speed
ALWAYS run engine at
full speed while pumping.
Figure 15. Throttle Lever (Idle)
Figure 16. Engine ON/OFF Switch (OFF)
OPERATION
WARNING — High Pressure
Water must always be flowing through the pump casing while
the engine is running. Loss of flow may be the result of a loss of
prime, restricted water flow or a dead-head situation. Please
note that in such a condition, water in the pump can reach
temperatures of 150-200°F in 15 to 20 minutes.This can cause
serious burns if this hot water comes into contact with
unprotected skin. Before touching or opening the fill plug or
drain plug, first turn off the engine and allow the pump casing to
cool to the touch, and then open the pump carefully.Be cautious
of any built up water pressure.
8. Before the pump is placed into operation, run the engine for
several minutes.
9. Check for fuel leaks and noises that would be associated
with a loose component.Check for leaks between pump
and engine. If water is leaking between the pump and
engine housing, the seal inside the pump may be worn or
damaged. Continued operation of the pump is not
recommended. Further usage of the pump under these
conditions may cause severe water damage to engine.
10. To begin pumping, place the throttle lever (Figure 14) in
the RUN position . If water is not flowing out of the
discharge port, turn off the engine and check for and clear
any obstructions within the suction hose.
STOPPINGTHE ENGINE
Normal Shutdown
1. Move the throttle lever to the IDLE position (Figure 15)
and run the engine for three minutes at low speed.
2. After the engine cools , turn the engine ON/OFF switch to
the OFF position (Figure 16).
3. Place the fuel shut-off lever (Figure 17) in the OFF position.
Figure 17. Fuel Valve Lever (OFF)
Emergency Showdown
1. Move the throttle lever quickly to the IDLE position, and
place the engine ON/OFF switch in the OFF position.

PAGE 20 — QP2H CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (08/04/08)
MAINTENANCE (PUMP)
PUMP VACUUMTEST
To perform the pump vacuum test do the following:
1. Remove the pump fill cap (Figure 2), and fill the pump
with water.
2. Start the engine as outlined in the initial start-up section,
and wait for the pump to begin pumping.
3. As shown in Figure 18 (next page), place a water hose
inside the discharge opening of the pump, and turn on
the water.This flow of water into the discharge opening
will prevent the pump from running dry.
4. Place the Pump Vacuum Tester (P/N 7000030) over
the pump suction (inlet) opening (Figure 18) with the
vacuum gauge facing upwards. It may be necessary
to apply a small amount of water around the rubber
seal of the vacuum tester to make a good suction fit.
5. Check and make sure that there are no air leaks
between the vacuum tester and the inlet port on the
pump. If air leaks are present reset vacuum tester.
6. Run the pump for a few minutes while monitoring the
vacuum gauge. If the gauge indicates a reading between
-25 and -20 in. Hg. (inches of mercury) then it can be
assumed that the pump is working correctly.
CAUTION — Pump Priming
DO NOT attempt to start the engine unless the pump
has previously been primed with water. Severe pump
damage will occur if pump has not been primed.
25 in. Hg (inches of mercury) translates into
25 feet of lift at sea level.
7. If the vacuum tester gauge indicates a reading below
-20 in. Hg, it can then be assumed that the pump is not
functioning correctly, and corrective action needs to
be taken.
8. To test the flapper valve , shut down the engine. The
vacuum tester should remain attached to the pump
suction inlet port by vacuum.This indicates the pump's
flapper valve is seating properly to hold water in the
suction hose when the engine is stopped.This prevents
backflow and allows for faster priming when the engine
is restarted.