Stow SDP-2, SDP-3 User Manual

OPERATION AND PARTS MANUAL

MODEL

SDP-2/SDP-3

DIAPHRAGM PUMPS

© COPYRIGHT 2003, MULTIQUIP INC.

Revision #2 (11/16/03)

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

A DIVISION OF MULTIQUIP INC.

POST OFFICE BOX 6254

CARSON, CA 90749
310-537-3700 • 888-252-STOW [888-252-7869]
FAX: [phone] • FAX: [phone]
E-MAIL: [e-mail] • WWW: stowmfg.com

PARTS DEPARTMENT:

800-427-1244
FAX: [phone]

SERVICE DEPARTMENT/TECHNICAL ASSISTANCE:

800-478-1244
FAX: [phone]

PAGE 2 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

HERE'S HOW TO GET HELP

PLEASE HAVE THE MODEL AND SERIAL

NUMBER

PARTS DEPARTMENT

800-427-1244 FAX: [phone]
310-537-3700 FAX: [phone]

SERVICE DEPARTMENT

800-478-1244 FAX: [phone]
310-537-3700

TECHNICAL ASSISTANCE

800-478-1244 FAX: [phone]

WARRANTY DEPARTMENT

800-421-1244, EXT. 279 FAX: [phone]
310-537-3700, EXT. 279

SALES DEPARTMENT

310-661-4242 FAX: [phone]
877-289-7869 (877-BUY-STOW)

ON-HAND

WHEN CALLING

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 3

STOW SDP-2/SDP-3 — TABLE OF CONTENTS

STOW SDP-2/SDP-3
Gasoline Powered
Diaphragm Pumps

Here’s How To Get Help ............................................ 2

Table of Contents ...................................................... 3

Parts Ordering Procedures .................................... 4-5

Specifications (Pump/Engine) ....................................6

Pump Dimensions ......................................................7

Safety Message Alert Symbols .............................. 8-9

Rules For Safe Operation .................................. 10-11

General Information ................................................. 12

Pump Components ..................................................13

Basic Engine ............................................................14

Pre-Inspection (Engine) ........................................... 15

Pre-Set-up (Pump) ............................................. 16-17

Initial Start-up (Engine) ...................................... 18-19

Maintenance (Pump) ......................................... 20-22

Maintenance (Engine)........................................ 23-24

Preparation for Long-Term Storage ......................... 25

Troubleshooting (Pump)...........................................26

Troubleshooting (Pump/Engine) ..............................27

Explanation Of Code In Remarks Column ...............28

Suggested Spare Parts ............................................29

HONDA GX120K1QX2 Engine

Air Cleaner Assembly......................................... 40-41

Camshaft Assembly ........................................... 42-43

Carburetor Assembly ......................................... 44-45

Control Assembly ............................................... 46-47

Crankcase Cover Assembly ............................... 48-49

Crankshaft Assembly ......................................... 50-51

Cylinder Barrel Assembly ................................... 52-53

Cylinder Head Assembly .................................... 54-55

Fan Cover Assembly .......................................... 56-57

Flywheel Assembly ............................................ 58-59

Fuel Tank Assembly ........................................... 60-61

Ignition Coil Assembly ........................................ 62-63

Muffler Assembly ............................................... 64-65

Piston Assembly ................................................. 66-67

Recoil Starter Assembly..................................... 68-69

Gasket Kit Assembly .......................................... 70-71

Labels ................................................................ 72-73

Terms and Condition Of Sale

— Parts .................... 74

Component Drawings

Water Box and Groove Assy. (2-inch) ................ 30-31

Pump Assy. (2-inch) ........................................... 32-33

Water Box and Groove Assy. (3-inch) ................ 34-35

Pump Assy. (3-inch) ........................................... 36-37

Axle, Handle, Engine Mtg. and Bumper Assy. ... 38-39

NOTE

Specification and part number
are subject to change without
notice.

NOTE

As a continuing effort to update
our parts book, contact the
STOW literature department for
the latest revision of your
"Operation and Parts Manual"

PAGE 4 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

PARTS ORDERING PROCEDURES

When ordering parts,

please supply the following information:

❒❒

❒ 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:

❒❒

✓ FedEx or UPS Ground
✓ FedEx or UPS Second Day or Third Day
✓ FedEx or UPS Next Day
✓ Federal Express Priority One
✓ DHL
✓ Tr u ck

Here’s how to get help...

Please have the model and serial number on
hand when calling.

Note: Unless otherwise indicated by customer, all
orders are treated as “Standard Orders”, and will
ship within 24 hours. We will make every effort to
ship “Air Shipments” the same day that the order is
received, if prior to 2PM west coast time. “Stock
Orders” must be so noted on fax or web forms.

Place Your Parts Order Via Web or Fax

For Even More Savings!

Parts Department

800-427-1244 Fax: [phone]

310-537-3700 Fax: [phone]

Service Department

800-478-1244 Fax: [phone]

310-537-3700

Technical Assistance

800-478-1244 Fax: [phone]

Warranty Department

800-421-1244, Ext. 279 Fax: [phone]

310-537-3700, Ext. 279

Sales Department

310-661-4242 Fax: [phone]

877-289-7869 (877-BUY-STOW)

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENT

STOW CONSTRUCTION EQUIPMENTSTOW CONSTRUCTION EQUIPMENT

A DIVISION OF MULTIQUIP INC.

POST OFFICE BOX 6254

CARSON, CA 90749
310-537-3700 • 888-252-STOW [888-252-7869]
FAX: [phone] • FAX: [phone]
E-MAIL: [e-mail] • WWW: stowmfg.com

Extra Discounts!

All parts orders which include complete part numbers
and are received by our automated web parts order
system, or by fax qualify for the following extra
discounts:

Ordered Standard Stock orders

via orders ($750 list and above)

Fax 3% 10%

Web 5% 10%

Special freight allowances
when you order 10 or more
line items via Web or Fax!**

FedEx Ground Service

No other allowances on freight shipped by any other
carrier.

NOTE: DISCOUNTS ARE SUBJECT TO CHANGE

at no charge for freight

Direct TOLL-FREE access

to our Parts Department:

Toll-free nationwide — 800-427-1244

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 5

STOW SDP-2/SDP-3 — SPECIFICATIONS (PUMP/ENGINE)

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PAGE 6 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

STOW SDP-2/SDP-3 — DIMENSIONS (PUMP)

Figure 1. STOW SDP-2/SDP-3 Pump Dimensions

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3-PDS

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 7

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STOW SDP-2/SDP-3 — SAFETY MESSAGE ALERT SYMBOLS

FOR YOUR SAFETY AND THE 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 Owner's Manual has been
developed to provide complete
instructions for the safe and

NOTE

efficient operation of the

Model SDP-2
Diaphragm Pumps.

engine manufacturers instructions
for data relative to its safe
operation.

Before using these pumps, ensure that the operating
individual has read and understands all instructions in this
manual.

STOW

and

SDP-3

Refer to the

HAZARD SYMBOLS

SAFETY MESSAGE ALERT SYMBOLS

The three (3) 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.

Lethal Exhaust Gases

Engine exhaust gases contain poisonous
carbon monoxide. This gas is colorless and

odorless, and can cause death if inhaled.
NEVER operate this equipment in a confined

area or enclosed structure that does not
provide ample free flow air.

Explosive Fuel

GASOLINE is extremely flammable, and its
vapors can cause an explosion if ignited. DO
NOT start the engine near spilled fuel or

combustible fluids. 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, in well-ventilated areas
and away from sparks and flames. NEVER

DANGER: You WILL be KILLED or

SERIOUSLY injured if you do not follow

WARNING: You CAN be KILLED or

SERIOUSLY injured if you do not follow
directions.

CAUTION: You CAN be injured if you

do not follow directions.

Potential hazards associated with the STOW SDP-2/SDP-3
diaphragm pumps operation will be referenced with Hazard
Symbols which appear throughout this manual, and will be
referenced in conjunction with Safety Message Alert Symbols.

Burn Hazards

Engine components can generate extreme heat.
To prevent burns, DO NOT touch these areas
while the engine is running or immediately after
operations. Never operate the engine with heat
shields or heat guards removed.

Rotating Parts

NEVER operate equipment with covers, or

guards removed. Keep fingers, hands, hair and
clothing away from all moving parts to prevent
injury.

PAGE 8 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

STOW SDP-2/SDP-3 — SAFETY MESSAGE ALERT SYMBOLS

Accidental Starting

ALWAYS place the engine ON/OFF switch in
the OFF position when the pump is not in use.

Sight and Hearing hazard

WARNING

To avoid injuries and damage to the
equipment,
contents of operation manual before operating

equipment.

ALWAYS wear approved eye and hearing
protection.

ALWAYS

read and understand

Respiratory Hazard

ALWAYS wear approved respiratory

protection.

Equipment Damage Messages

Other important messages are provided throughout this manual
to help prevent damage to your pump, other property, or the
surrounding environment.

This pump, other property, or the

NOTE

surrounding environment could be
damaged if you do not follow
instructions.

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 9

STOW SDP-2/SDP-3 — RULES FOR SAFE OPERATION

■

DANGER:

Failure to follow instructions in this manual may
lead to serious injury or even death! This
equipment is to be operated by trained and
qualified personnel only! This equipment is for
industrial use only.

The following safety guidelines should always be used when
operating the

GENERAL SAFETY

■

DO NOT operate or service this equipment before
reading this entire manual.

■

This equipment should not be operated by
persons under 18 years of age.

■

NEVER operate this equipment without proper
protective clothing, shatterproof glasses, steel­toed boots and other protective devices required
by the job.

Diaphragm Pump

:

NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to

■

High Temperatures – Allow the engine to cool before adding
fuel or performing service and maintenance functions. Contact

hot

with

■

The engine of this pump requires an adequate free flow of
cooling air.
narrow area where free flow of the air is restricted. If the air

components can cause serious burns.

NEVER!

operate the pump in any enclosed or

flow is restricted it will cause
serious damage to the
pump or engine and may
cause injury to people and
property. Remember the
pump's engine gives off
DEADLY gases.

■

NEVER operate this equipment when not feeling
well due to fatigue, illness or taking medicine.

■

NEVER operate this equipment under the
influence or drugs or alcohol.

■

Whenever necessary, replace nameplate, operation and safety
decals when they become difficult read.

■

ALWAYS check the machine for loosened threads or bolts
before starting.

■

ALWAYS wear proper respiratory (mask) hearing and eye
protection equipment when operating the pump.

■

ALWAYS refuel in a well-ventilated area, away from sparks
and open flames.

■

ALWAYS use extreme caution when working with flammable
liquids. When refueling, stop the engine and allow it to cool.

DO NOT

could result from fuel vapors, or if fuel is spilled on a hot
engine.

■

NEVER operate the pump in an

atmosphere

materials. An explosion or fire could result
causing severe

smoke around or near the machine. Fire or explosion

explosive

or near combustible

bodily harm or even

death.

■

Topping-off to filler port is dangerous, as it tends to spill fuel.

■

Refer to the
questions or information.

■

NEVER use accessories or attachments, which are not
recommended by Multiquip for this equipment. Damage to
the equipment and/or injury to user may result.

Engine Owner's Manual

for engine technical

■

Manufacturer does not assume responsibility for any accident
due to equipment modifications.

PAGE 10 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

STOW SDP-2/SDP-3 — RULES FOR SAFE OPERATION

■

■

NEVER Run engine without air cleaner. Severe engine

damage may occur.

■

ALWAYS read, understand, and follow procedures in
Operator’s Manual before attempting to operate equipment.

■

ALWAYS be sure the operator is familiar with proper safety
precautions and operation techniques before using pump.

■

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.

■

NEVER leave the pump unattended, turn off engine when
unattended.

■

Unauthorized equipment modifications will void all
warranties.

■

NEVER pump volatile, explosive, flammable or low flash point
fluids. These fluids could ignite or explode.

■

NEVER operate the pump in an

■

Before starting the pump, check that the clean-out cover is

explosive

atmosphere.

securely fasten.

■

ALWAYS ensure pump is on level ground before use.

■

Become familiar with the components of the pump before
operating.

■

ALWAYS replace any worn or damaged warning decals.

■

NEVER pump corrosive chemicals or water containing toxic
substances. These fluids could create serious health and
environmental hazards. Contact local authorities for
assistance.

High Temperatures – Always stop engine and allow the
engine to cool before adding fuel, oil or performing service
and maintenance functions. Contact with
cause serious burns.

■

NEVER disconnect any

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.

Maintenance Safety

■

■

■

■

■

■

■

Emergencies

■

ALWAYS know the location of the

nearest

hot

components can

"emergency or safety devices"

.

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 machinery in proper running condition.
Fix damage to the machine immediately and always replace

broken parts, or missing decals.
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.

fire extinguisher

.

■

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.

■

NEVER open the pump housing during operation or start the

pump with the clean-out cover removed. The rotating impeller
inside the pump can cut or sever objects caught in it.

■

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.

■

In winter drain water from pump housing to prevent freezing.

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 11

■

■

ALWAYS know the location of the nearest

first aid kit

In emergencies

nearest phone or

.

always

know the location of the

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.

STOW SDP-2/SDP-3 — GENERAL INFORMATION

APPLICATION

STOW Model SDP-2

The

and

SDP-3 diaphragm

pumps are
designed to be used for de-watering applications. The suction
and discharge ports on the

SDP-2

use a 2-inch diameter opening,
which allows the pump to pump at rate of approximately 3,000
gallons/hour (gph) or 11,340 liters/hour (lph). The suction and

SDP-3

discharge ports on the

use a 3-inch diameter opening,

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.

which allows the pump to pump at rate of approximately 5,100
gallons/hour (gph) or 19,320 liters/hour (lph).

For example, in Flagstaff, Arizona where the elevation is
approximately 7,000 feet, the pump would have a suction lift of

Diaphragm pumps use a positive displacement design rather
than centrifugal force to move water through the casing. This

only 18 feet rather than the 25 feet at sea level. Table 3 shows
suction lift at various elevations.

means the pump will deliver a specific amount of flow per stroke,
revolution or cycle. These pumps are commonly referred to as
mud hogs, mud hens and mud suckers. Their names reflect their
popularity for use in applications where shallow depths and slurry
water render centrifugal pumps ineffective

Power Plant

leveLaeS)840.3(0.01)275.4(0.51)690.6(0.02)026.7(0.52

These diaphragm pumps are powered by an 4.0 horsepower air
cooled, 4-stroke, single cylinder
that incorporates a low "

HONDA GX-120

Oil Alert Feature

gasoline engine

" . The drive shaft of the
engine is coupled to an offset connecting rod that is coupled to a
flexible diaphragm. The connecting rod alternately raises
(expands) and lowers (contracts) the diaphragm at a rate
between 40 and 65 strokes per minute depending on engine
speed.

Oil Alert Feature

In the event of

low oil

or

no oil

, the HONDA GX-120 engine has

Table 4 shows percentage drops in performance as elevation
increases.

a built-in oil alarm engine shut-down feature. In the event the oil
level is low the engine will automatically shut-down.

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

in 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.

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PAGE 12 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

STOW SDP-2/SDP-3 — PUMP COMPONENTS

Figure 2 shows a typical application using the STOW SDP-2 or SDP-3 diaphragm pump. Please note that this pump is intended for
the removal of clean water and water containing some debris and solids. Maximum size of solids should not exceed 1 inch (25 mm)
in diameter. DO NOT set strainer on bottom of water bed. Placing the strainer above the water bed will prevent the pump from
drawing in excessive amounts of sand and foreign debris.

NOTE

1. Pump – The STOW Models SDP-2 and SDP-3 are 2-inch
and 3-inch diaphragm pumps respectively and are used in
general de-watering applications. Typical dewatering
applications consist of cleaning out cesspools and septic
tanks, draining slow seepage from small excavations,
trenches and construction sites, or pumping out industrial
waste.

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 either a 2-inch, and 3-inch
discharge hose to this port depending on pump model.

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 a 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.

Contact your nearest Multiquip
dealer for quick disconnect hoses
and fittings.

Figure 2. STOW SDP-2/SDP-3 Pump Application

6. Suction Port – Connect either a 2-inch or 3-inch inlet

7. Suction Hose – Connect a flexible rubber hose to the

8. Strainer – Always attach a strainer to bottom side of the

9. Transmission Oil Fill Plug – Remove this plug to add

10. Connecting Rod Grease Access Hole – Grease

hose to this port depending on pump model. Use two worm
clamps to secure the hose.

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

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.

SAE 80/90 EP gear oil to the transmission. Transmission oil
capacity is 1-1/4 pints (550 ml.).

connecting rod bearing through this access hole. Grease
connecting rod bearing every 25 hours of operation.

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 13

STOW SDP-2/SDP-3 — BASIC ENGINE

Figure 3. Engine Controls and Components

INITIAL SERVICING

The engine (Figure 3) must be checked for proper lubrication and
filled with fuel prior to operation. Refer to the manufacturers engine
manual for instructions & 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.

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.

DANGER

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.

2. Throttle Lever – Used to adjust engine RPM speed (lever

advanced forward

FAST

).

SLOW

, lever back toward operator

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.

NOTE

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.

WARNING

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.

PAGE 14 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

while the engine is running or immediately after operating. NEVER
operate the engine with the muffler removed.

10. Fuel Tank – Holds unleaded gasoline. For additional

Engine components can generate extreme heat.
To prevent burns, DO NOT touch these areas

information refer to engine owner's manual.

STOW SDP-2/SDP-3 — PRE-INSPECTION (ENGINE)

CAUTIONCAUTION

CAUTION

CAUTIONCAUTION

NEVER operate the pump in
a confined area or enclosed
area structure that does not
provide ample

.

air

ALWAYS wear approved eye and hearing

protection before operating the pump.

Before Starting

1. Read safety instructions at the
beginning of manual.

2. Clean the pump, removing dirt and
dust, particularly the engine
cooling air inlet, carburetor and air
cleaner.

3. Check the air filter for dirt and dust. If air filter is dirty, replace
air filter with a new one as required.

4. Check carburetor for external dirt and dust. Clean with dry
compressed air.

free flow of

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 5), fill to the edge of the oil filler
hole with the recommended oil type (Table 5). Maximum oil
capacity is 1.16 quarts (1.1 liters)

Figure 5. Engine Oil Dipstick (Oil Level)

epyTliO.5elbaT

nosaeS erutarepmeT epyTliO

remmuS rehgiHroC°52 03-W01EAS

llaF/gnirpS C°01~C°52 02/03-W01EAS

retniW rewoLroC°0 01-W01EAS

5. Check fastening nuts and bolts for tightness.

DANGERDANGER

DANGER

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 4) and wipe clean.

Figure 4. Engine Oil Dipstick (Removal)

DANGERDANGER

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

Explosive Fuel

Motor fuels are highly flammable and can be
dangerous if mishandled. DO NOT smoke
while refueling. DO NOT attempt to refuel the
pump if the engine is

hot! or running

immediately!

.

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 15

STOW SDP-2/SDP-3 — PRE-SETUP (PUMP)

Before Starting

1. Read safety instructions at the

beginning of manual.

2. Place pump as near to water as
possible, on a firm flat, level surface.

3. 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.

5. The discharge hose is usually a

6. Make sure the

CAUTION :

Pump casing
before using pump. Otherwise pump will not
be able to begin pumping.

must

be filled with water

CAUTION :

WARNING :

DO NOT open

inside may be under pressure.

fill cap

if pump is hot! Water

Suction and discharge hoses are

NOTE

available from Multiquip. Contact
your nearest dealer for more
information.

collapsible

hose, however if a thin-walled discharge hose is not avail­able, a rigid suction hose can be substituted in its place.

suction strainer

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.

The strainer should be positioned so it will

remain completely
pump with the strainer above water for long
periods can damage the pump.

(Figure 2) is clean and

under water

(thin-walled)

. Running the

CAUTION :

DO NOT pump flammable fluids, corrosive chemicals or fluids

4. Check for
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.

Hoses and Clamps

1. Check that all hoses are
Make certain suction hose (Figure 2) does not have any air
leakage. Tighten hose clamps and couplings as required.

2. It is recommended that 2 clamps be used when securing the
suction hose to the inlet side (suction) of the pump.

3. Remember suction hoses must be
collapse when the pump is in operation.

4. Check that

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.

leaks

between pump and engine. If water is leaking

the

discharge

securely

hose (Figure 2) is not restricted.

attached to the pump.

rigid

enough not to

containing toxic substances. These fluids can create potentially
dangerous health and environmental hazards. Contact local
authorities for assistance.

CAUTION :

water in the casing as this will cause damage to the mechanical
seal.

This pump uses a water-cooled

to prevent water from seeping into the

seal

engine. The passage of water through the pump
casing lubricates the seal and prevents it from
overheating.

NEVER!

operate the pump without

mechanical

PAGE 16 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

STOW SDP-2/SDP-3 — PRE-SETUP (PUMP)

Gear Reduction Oil (Transmission)

1. Remove the transmission oil level plug (Figure 6). If oil

begins to seep out as the plug is being removed, then it
can be assumed that the transmission oil is at the proper
operating level.

2. If oil does not seep out as the oil level plug is being removed,

then remove the transmission oil fill plug and fill with

SAE 80/90

Transmission oil capacity is capacity is 1-1/4 pints (590 ml.).

EP gear oil

to the proper operating level.

Connecting Rod Bearing Lubrication

1. Grease connecting rod bearing thru the acess hole
(Figure 7) every 25 hours of operation.

2. Use only
NLG1 Grade #2 consistency.

Figure 7. Connecting Rod Bearing Lubrication

premium lithium based grease

, conforming to

NOTE

Figure 6. Transmission Oil Level

Diaphragm pumps will handle fluids
containing considerable solids (not to
exceed 1.00 inch/25 mm), however, if
the mixture is too heavy to be pumped,
water must be added until the mixture
becomes sufficently fluid for pumping.

Helpful Hints

The capacity of this diaphragm pump will vary greatly depending on
the height of the suction lift and length of the discharge hose. A
discharge hose which is too small, long or high will cause the
following:

■

Excessive bulging of diaphragm on the down stroke.

■

Valves closing with a lould snap.

■

Rough operation.

■

Engine overloads and slow downs.

■

Reduced efficiency

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 17

STOW SDP-2/SDP-3 — INITIAL START-UP (ENGINE)

CAUTION :

DO NOT attempt to operate the pump until the Safety, General

Information and Inspection sections of this manual have been

read and thoroughly understood

This section is intended to assist the operator with the

start-up

section be read carefully before attempting to use the pump in
the field.

Starting the Engine (

1. Place the engine

of the trash pump. It is extremely important that this

HONDA

fuel valve lever

position.

.

initial

engine)

(Figure 8) to the "ON"

4. Place the
if starting a

5. Place the
position.

choke lever

warm engine

Figure 11. Engine Choke Lever (Closed)

engine ON/OFF switch

(Figure 9) in the "CLOSED " position

or the

temperature is warm.

(Figure 12) in the "ON "

Figure 8. Engine Fuel Valve Lever (ON Position)

2. Move the
position, about 1/3 of the way toward the fast position.

3. Place the
starting a

Figure 10. Engine

Choke Lever (Open)

throttle lever

Figure 9. Throttle Lever (1/3 Start Position)

choke lever

cold

engine.

(Figure 9) away from the slow

(Figure 10) in the "OPEN " position if

Figure 12. Engine ON/OFF Switch (ON Position)

6. Grasp the starter grip (Figure 13) 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.

Figure 13. Starter Grip

PAGE 18 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

STOW SDP-2/SDP-3 — INITIAL START-UP (ENGINE)

7. If the engine has started, slowly return the choke lever
(Figure 14 ) to the “CLOSED” position. If the engine has not
started repeat steps 1 through 6.

Figure 14. Choke Lever (Closed)

8. Before the pump is placed into operation, run the engine for
several minutes. Check for fuel leaks, and noises that would
associate with a lose component.

Stopping The Engine

Normal Shutdown

1. Move the throttle lever to the IDLE position (Figure 16) and
run the engine for three minutes at low speed.

2. After the engine
“OFF” position (Figure 17).

Figure 16. Throttle Lever (Idle)

cools

, turn the engine ON/OFF switch to the

To begin pumping, place the throttle lever (Figure 15) in the

9.

"RUN" position.

3. Place the
position.

Figure 15. Throttle Lever (Run)

Emergency Showdown

Pump speed can be

NOTE

operation can be determined by trying to pump at several speeds.
Limit maximum speed to 65 strokes per minute of the diaphragm
(2,800 RPM engine speed).

the engine throttle control from full
volume, 65 strokes per pinute, to
about 40 strokes per minute for
lesser volume seepage.Smoothest

regulated

1. Move the throttle lever quickly to the “IDLE

with

place the engine ON/OFF switch in the “OFF” position.

Figure 17. Engine ON/OFF Switch (OFF)

fuel shut-off lever

Figure 18. Fuel Valve Lever (OFF)

(Figure 18) in the ”OFF”

”

position, and

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 19

NOTE PAGE

PAGE 20 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

STOW SDP-2/SDP-3 — MAINTENANCE (PUMP)

Pump Vacuum Test

Pump Cleaning

After pumping water containing large amounts of dirt and

CAUTION:

DO NOT attempt to start the engine unless the

pump has previously been
Severe pump damage will occur if pump has
not been primed.

primed

with water.

debris, perform the following:

1. Remove the drain plug from the pump housing (Figure 2)
and drain any water left in the pump.

3. Clean and remove dirt, debris from pump casing. Inspect
impeller and volute for wear. Replace any damaged or

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 19 (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

4. Place the

the pump from running dry.

Pump Vacuum Tester

(P/N 7000030) over

worn parts.

Gear Reduction Oil (Transmission)

1. Change transmission oil after the first
operation. Use SAE 80/90
capacity is 1-1/4 pints (590 ml.). Check oil level periodically
and change oil after every

Connecting Rod Bearing Lubrication

1. Grease connecting rod bearing thru the access
hole (Figure 7) every 25 hours of operation.

2. Use only
NLG1 Grade #2 consistency.

the pump suction (inlet) opening (Figure 19) 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

Connecting Rod Bearing Lubrication

1. Keep interior of pump and valves clean. Flush out
pump with clear water after operation.

2. Remove connecting rod guard occasionally and wipe
up excess grease from connecting rod bearing.

leaks are present reseat vacuum tester.

40 hours

EP gear oil.

400 hours

premium lithium based grease

Transmission oil

of operation.

, conforming to

of

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.

25 in. Hg (inches of mercury)

NOTE

translates into 25 feet of lift at

level

.

sea

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.

6. 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.

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 21

STOW SDP-2/SDP-3 — MAINTENANCE (PUMP)

NOTE

Figure 19. Pump Vacuum Tester

PAGE 22 — STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL — REV. #2 (12/16/03)

Pressure reading may vary depending on
altitude. See Tables 3 and 4 on page 12.

STOW SDP-2/SDP-3 — MAINTENANCE (ENGINE)

Engine Maintenance

Perform engine maintenance procedures as referenced by
Table 6 below:

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TSRIF

)3(NOITPIRCSEDNOITAREPOEROFEB

KCEHCX

liOenignE

EGNAHCX

KCEHCX

renaelCriA

EGNAHC)1(X

stloB&stuNllA

gulPkrapS

sniFgnilooCKCEHCX

retserrAkrapSNAELC X

knaTleuFNAELC X

fInethgit-eR

yrasseceN

NAELC-KCEHCX

ECALPER X

X

HTNOM

RO

.SRH01

YREVE

SHTNOM3

RO

.SRH52

YREVE

SHTNOM6

RO

.SRH05

YREVE

RAEY

RO

.SRH001

YREVE

SRAEY2

RO

.SRH002

retliFleuFKCEHC X

deepSeldITSUJDA-KCEHC )2(X

ecnaraelCevlaVTSUJDA-KCEHC )2(X

senilleuFKCEHC )2()yrassecenfiecalper(sraey2yrevE

nidesunehwyltneuqerferomecivreS)1( YTSUD .saera

yllacinahcemeradnaslootreporpehtevahuoysselnu,relaedcivresruoyybdecivresebdluohssmetiesehT)2(

serudecorpecivresroflaunaMpohsADNOHehtotrefeR.tneiciforp

.slavretniecnanetniamreporpenimretedotnoitarepofosruohgol,esulaicremmocroF)3(

NOTE

Reference manufacturer engine
manual for specific servicing
instructions.

STOW SDP-2 / SDP-3 DIAPHRAGM PUMP — PARTS MANUAL— REV. #2 (12/16/03) — PAGE 23