Owner’s Manual
Water Pump
Model CW15
Model ST20
Model Number
Serial Number
www.generac.com or 1-888-436-3722
WARNING!
California Proposition 65
Engine exhaust and some of its constituents are known to the state of California to cause cancer,
birth defects, and other reproductive harm.
WARNING!
California Proposition 65
This product contains or emits chemicals known to the state of California to cause cancer,
birth defects, and other reproductive harm.
ii
Table of Contents
Section 1 - Introduction
1.1 - Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Section 2 - Safety
2.1 - Safety Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section 3 - General Information
3.1 - Know Your Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 - Product Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 - Emissions Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 - High Altitude Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5 - Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Section 4 - Set-up
4.1 - Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 - Add Engine Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 - Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.4 - Connect Suction and Discharge Hose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5 - Prime the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Section 5 - Operation
5.1 - Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 - Water Pump Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 - Checklist Before Starting Engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 - How to Start Your Water Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.5 - How to Stop Your Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Section 6 - Maintenance
6.1 - Maintenance Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 - Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 - Emissions Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.4 - Water Pump Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.5 - Check Hose Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
6.6 - Check Hoses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.7 - Engine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.8 - Engine Oil Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.9 - Service Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.10 - Service Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.11 - After Each Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.12 - Long Term Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.13 - Other Storage Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.14 - Transporting/Tipping of the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
0
Section 7 - Troubleshooting
7.1 - Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
iii
iv
Section 1 Introduction
1.1 — INTRODUCTION
Thank you for purchasing this water pump manufactured
by Generac Power Systems, Inc. This is a high performance, air-cooled, engine-driven water pump that operates at 80 or 158 GPM depending on model.
Common sense and strict compliance with the special instructions are essential to preventing accidents. The operator must read this manual and
thoroughly understand all of the instructions and warnings before using the equipment. If any portion of the
manual is not understood, contact the nearest Au thorized
Dealer for starting, operating and servicing procedures.
The owner is responsible for proper and safe use of the
equipment.
The water pump can operate safely, efficiently and reliably only if it is properly located, operated and maintained. Before operating, servicing or storing:
• Study all warnings in this manual and on the product
carefully.
• Become familiar with this manual and the unit before
use.
• Refer to the Assembly section of the manual for
instructions on final assembly procedures. Follow the
instructions completely.
The manufacturer cannot anticipate every possible circumstance that might involve a hazard. The warnings in
this manual, and on tags and decals affixed to the unit
are, therefore, not all inclusive. If using a procedure, work
method or operating technique that the manufacturer
does not specifically recommend, ensure that it is safe for
others. Also make sure the procedure, work method or
operating technique utilized does not render the water
pump unsafe.
THE INFORMATION CONTAINED HEREIN WAS
BASED ON MACHINES IN PRODUCTION AT THE
TIME OF PUBLICATION. GENERAC RESERVES THE
RIGHT TO MODIFY THIS MANUAL AT ANY TIME.
Save these instructions. If you loan this device to
someone, always loan these instructions and
Owner's Manual to individual as well.
1.1.1 — Where to Find Us
You can contact Generac Customer Service by phone at
1-888-436-3722, or on the internet at www.generac.com.
Record model and serial number of unit on front cover for
future reference and/or service inquiries.
Water Pump 1
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Introduction
2 Water Pump
KickbackToxic Fumes Electrical Shock
Fluid InjectionFall
Fire Explosion Operator’s Manual
Slippery Surface
Moving Parts Flying Objects Hot Surface
Hearing Protection
Using engine powered equipment indoors CAN KILL
YOU IN MINUTES.
Engine exhaust contains carbon monoxide. This is a
poison you cannont see or smell.
Section 2 Safety
2.1 — SAFETY RULES
Throughout this publication, and on tags and decals
affixed to the water pump, DANGER, WARNING, CAUTION and NOTE blocks are used to alert personnel to
special instructions about a particular operation that may
be hazardous if performed incorrectly or carelessly.
Observe them carefully. Their definitions are as follows:
Indicates a hazardous situation or action which, if
not avoided, will result in death or serious injury.
Indicates a hazardous situation or action which, if
not avoided, could result in death or serious injury.
Indicates a hazardous situation or action which, if
not avoided, could result in minor or moderate injury.
NOTE: Notes contain additional information important to a procedure and will be found within the regular text body of this manual.
These safety warnings cannot eliminate the hazard s th at
they indicate. Common sense and strict compliance with
the special instructions while performing the action or
service are essential to preventing acciden ts.Safety
Symbols and Meanings.
Water Pump 3
Figure 2-1. Exhaust Hazard
Safety
2.1.1 — Exhaust Hazards
Carbon monoxide produced during use can
kill in minutes. NEVER use indoors, in a vehicle, or in other sheltered areas, EVEN IF doors
and windows are open. Only use OUTSIDE
and far away from windows, doors and vents.
• Operate water pump ONLY outdoors.
• A running engine gives off carbon monoxide.
• Carbon monoxide is an odorless, colorless, poisonous
gas. Breathing carbon monoxide can cause he adache,
fatigue, dizziness, vomiting, confusion, seizures, nausea, fainting or death. If you start experiencing any of
these symptoms, IMMEDIATELY move to fresh air.
Seek medical attention.
• Keep exhaust gas from entering a confin e d ar ea
through windows, doors, ventilation intakes, or other
openings. Warn any occupants inside about the symptoms of carbon monoxide so they know to move to
fresh air if they begin to feel ill.
• The use of a carbon monoxide detector inside any
occupied premises between the water pump and the
occupant is recommended.
• NEVER start or run engine indoors, in a vehicle, or in
an enclosed area, even if windows and doors are open.
• Use a respirator or mask whenever there is a chance
that harmful gas or vapors may be inhaled.
• Read all instructions with respirator or mask so you are
certain the respirator or mask will provide the necessary protection against inhaling harmful gas or vapors.
If you begin to experience any of the CO sympto m s
listed above, IMMEDIATELY move to fresh a ir.
2.1.2 — Electrical Shock Hazard
Risk of electrocution.
Contact with power source can cause elect ric
shock or burn.
• NEVER have discharge hose near power source.
2.1.3 — Hot Surfaces Hazard
Contact with muffler area can result in
serious burns. Exhaust heat/gases can
ignite combustibles, structures or
damage fuel tank causing a fire.
• DO NOT touch hot parts and AVOID hot exhaust
gases.
• Allow equipment to cool before touching.
• Keep at least five (5) feet (152 cm) of clearance on all
sides of water pump including overhead.
• It is a violation of California Public Resource Code,
Section 4442, to use or operate the engine on any forest-covered, brush-covered, or grass-covered land
unless the exhaust system is equipped with a spark
arrester , as defined in Section 4442, maintained in
effective working order. Other states or federal jurisdictions may have similar laws. Contact the original equipment manufacturer, retailer, or d ealer to obtain a spark
arrester designed for the exhaust system installed on
this engine.
• Replacement parts must be the same and installed in
the same position as the original parts.
2.1.4 — Fire Hazards
Fuel and its vapors are extremely flammable and explosive. Fire or explosion
can cause severe burns or death.
WHEN ADDING OR DRAINING FUEL
• Turn water pump OFF and let it cool at least two (2)
minutes before removing fuel cap. Loosen cap slowly
to relieve pressure in tank.
• Fill or drain fuel tank outdoors.
• DO NOT overfill tank. Allow space for fuel expansion.
• If fuel spills, wait until it evaporates before starting
engine.
• Keep fuel away from sparks, open flames, pilot lights,
heat, and other ignition sources.
• DO NOT light a cigarette or smoke.
WHEN STARTING EQUIPMENT
• Ensure spark plug, muffler, fuel cap, and air cleaner
are in place.
• DO NOT crank engine with spark plug removed.
• Keep your hands and body clear from the discharge o f
the pump.
• Make sure all connections are tight.
• Secure the pump. Loads from the hoses may cause it
to tip over.
• Secure the discharge hose to avoid whipping.
WHEN OPERATING EQUIPMENT
• DO NOT tip engine or equipment at ang le wh ich
causes fuel to spill.
4 Water Pump
Safety
• DO NOT pump chemicals or flammable liquids, such
as fuel, or fuel oils.
• Reflective exhaust heat may damage the fuel tank,
causing fire. Keep at least 5 feet of clearance on all
sides of the pump for adequate cooling, maintenance,
and servicing.
• DO NOT use to pump fluid intended for human consumption.
• Secure the pump. Loads from the hoses may cause it
to tip over.
• DO NOT stop the engine by moving the choke lever to
the CHOKE position.
• Wear ear protection to reduce objectionable noise .
WHEN TRANSPORTING OR REPAIRING EQUIPMENT
• Transport/repair with fuel tank EMPTY.
• Disconnect spark plug wire.
WHEN STORING FUEL OR EQUIPMENT WITH FUEL
IN TANK
• Store away from furnaces, stoves, water heaters,
clothes dryers, or other appliances that have pilot light
or other ignition source because they can ignite fuel
vapors.
2.1.6 — Fall Hazard
Use of water pump can create puddles
and slippery surfaces.
• Use only on a level surface.
• The area should have adequate slopes and drainage
to reduce the possibility of a fall due to slippery surfaces.
• Do not use on elevated surfaces wh er e th er e co uld be
a chance of a serious fall.
2.1.7 — Moving Parts Hazard
Starter and other rotating parts can entangle
hands, hair, clothing, or accessories.
• NEVER operate water pump without protective housing or covers.
• DO NOT wear loose clothing, jewelry or anything that
may be caught in the starter or other rotating parts.
• Tie up long hair and remove jewelry.
• DO NOT operate this pump dry!
• Excessively high operating speeds increase risk of
injury and damage to pump.
• Excessively low speeds impose a heavy load.
• DO NOT tamper with the governed speed.
• DO NOT modify the pump in any way.
• DO NOT allow unqualified persons or children to operate or service pump.
• DO NOT insert any objects through cooling slots.
• Treating the pump improperly can damage it and
shorten its life.
• Be sure pump chamber is filled with water before starting the engine. NEVER run pump without priming.
• Use a non-collapsible hose on the suction side of the
pump.
• Use the pump only for its intended uses.
2.1.5 — Hearing Protection Hazard
Hearing Protection Recommended.
2.1.8 — Kickback Hazard
Starter cord kickback (rapid retraction) can
result in bodily injury. Broken bones, fractures, bruises, or sprains could result.
• When starting engine, pull cord slowly until resistance
is felt and then pull rapidly to avoid kickback.
2.1.9 — Spark Hazards
Unintentional sparking can result in
fire or electric shock.
WHEN ADJUSTING OR MAKING
REPAIRS TO YOUR WATER PUMP.
• Disconnect the spark plug wire from the spark pl ug and
place the wire where it cannot contact spark plug.
WHEN TESTING FOR ENGINE SPARK
• Use approved spark plug tester.
• DO NOT check for spark with spark plug removed.
Water Pump 5
2.1.10 — Splash Hazards
Risk of eye injury. Spray can splash back or
propel objects.
• Always wear safety goggles when using this equipment or in vicinity of where equipment is in use.
• Before starting the water pump, be sure you are wearing adequate safety goggles.
• NEVER substitute safety glasses for safety goggles.
NOTE: Improper treatment of water pump can damage it and shorten its life.
• If you have questions about intended use, ask dealer
or contact qualified service center.
• NEVER operate units with broken or missing parts, or
without protective housing or covers.
• DO NOT by-pass any safety device on this machine.
• DO NOT operate water pump above rated head.
• DO NOT modify water pump in any way.
• Before starting water pump in cold weather, check all
parts of the equipment to be sure ice has not formed.
• NEVER move machine by pulling on hoses. Use handle provided on unit.
• Check fuel system for leaks or signs of deterioration,
such as chafed or spongy hose, loose or missing
clamps, or damaged tank or cap. Correct all defects
before operating water pump.
• This equipment is designed to be used with Generac
authorized parts ONLY. If equipment is used with parts
that DO NOT comply with minimum specifications, user
assumes all risks and liabilities.
Safety
6 Water Pump
H
G
OAPJI
K
L
F
E
D
C
B
M
N
Q
Section 3 General Information
3.1 — KNOW YOUR WATER PUMP
Read this owner’s manual and safety rules before operating your water pump. If you loan this device to someone,
ALWAYS loan these instructions AND the owner’s manual to the individual as well. Compare the illustrations
with your water pump to familiarize yourself with the locations of various controls (Figure 3-1). Save this manual
for future reference. Replacement owner’s manuals can
be printed from the Generac Web site.
A -Lifting Handle - Used to lift the water pump.
B -Discharge Port - Location to attach discharge hose.
C -Suction Port - Location to attach suction hose.
D -Water Drain Plug - Used to empty the water pump
after use.
E -Oil Fill - Check and add engine oil
F -Oil Drain Plug - Used to drain engine oil.
G -Muffler - Where hot exhaust gas exits the water
pump.
H-Fuel Tank - Fill tank with regular unleaded fuel.
Always leave room for fuel expansion.
I -Choke - Prepares a cold engine for starting.
J -Air Filter - Protects engine by filtering dust and
debris out of the intake air.
K-Recoil Starter - Used for starting the engine.
L -Engine ON/OFF Switch - Turn switch to ON before
using recoil starter. Turn switch to Off to stop engine.
M -Priming Cap - Remove cap and fill the pump with
water before starting the unit.
N -Fuel Gauge - Indicates the amount of fuel remain ing
in the fuel tank.
O -Fuel On/Off Valve - Turns fuel supply to the engine
on and off.
P -Throttle Lever - Increases or decreases engine
speed.
Q -Serial number location
R -Blue Discharge Hose - Used to discharge water
from the pump
S -Hose Clamps - Secure the hose to the hose barbs
and the filter
T -Hose Nut - Secures the hose barb to the pump
U -Hose Barb - Holds the hose to the pump
V -Sealing Ring - Prevents leaking
W -Green Suction Hose - Used to bring water into the
pump
X -Filter Attachment - Used to connect filter basket to
the suction hose.
Y -Filter Basket - Used to keep debris out of the pump.
Figure 3-1. ST20 Features and Controls
Water Pump 7
Figure 3-2. CW15 Features and Controls
H
I
J
M
K
L
B
C
D
G
E
F
Q
V
U
T
S
R
W
X
Y
General Information
A
Figure 3-3. Features and Controls
8 Water Pump
General Information
3.2 — PRODUCT SPECIFICATIONS
Model CW15K ST20K
Flow Rate (GPM / LPM) 80/303 158/598
Suction/Discharge Diameter (Inches/mm) 1.5/40 2/50
Total Head (feet/meter) 80/24.4 108/32.9
Suction Head (feet/meter) 26/7.9 26/7.9
Suction Hose Length (feet/meters) 10/3.1 12/3.7
Discharge Hose Length (feet/meters) 25/7.6 25/7.6
Engine Displacement (Cubic Inch/cc) 4.8/79 12.7/208
Spark Plug Type
Spark Plug Gap (Inches/mm) 0.028-0.031 / 0.70-0.80
Fuel Capacity (Gallon/Liters) 0.4/1.5 3/11.5
Oil Capacity (Oz/Liters) 13.5/0.4 20/0.6
Low Oil Shut Down System No Yes
On/Off Switch Yes
E6RTC or
Equivalent
F6RTC or
Equivalent
3.3 — EMISSIONS INFORMATION
The U.S. Environmental Protection Agency (and California Air Resource Board for equipment certified to CA
standards) requires that this engine comply with exhaust
and evaporative emission standards. Locate the emissions compliance decal on the engine to determine what
standards the engine meets, and to determine which
emissions warranty applies. The engine is certified to
meet the applicable emission standards on gasoline . It is
important to follow the maintenance specifications in the
Maintenance section to ensure that the engine com plie s
with the applicable emission standards for the duration of
the product’s life. This engine utilizes lean carburetion
settings and other systems to reduce emissions. Tampering with or altering the emission control system may
increase emissions and may be a violation of Federal or
California Law. Acts that constitu te t ampering in clude but
are not limited to:
• Removal or alteration of any part of the intake, fuel, or
exhaust systems
• Altering or defeating the governor linkage or speedadjusting mechanism to cause the engine to operate
outside its design parameters
If you are aware of any of the following symptoms, have
your engine inspected and repaired by your servicing
dealer:
• Hard starting or stalling after starting
• Rough idle
• Misfiring or backfiring under load
• Afterburning (backfiring)
• Black exhaust smoke or high fuel consumption
3.4 — HIGH ALTITUDE OPERATION
The fuel system on this engine may be influenced by
operation at higher altitudes.
3.5 — UNPACKING
1. Remove the loose parts, kits, and inserts included
with water pump.
2. Open carton completely by cutting each corner from
top to bottom.
3. Ensure you have all included items prior to assembly.
• Main Unit
• Hose Kit
- Suction Hose
- Discharge Hose
- Hose Filter
- Hos e Nut (2)
- Hose Clam p (3)
- Hose Barb (2)
- Sealing Ring (2)
• Loose Parts
- Oil Bottle
- Funnel
-Spark Plug wrench
- Operator ’s Manual
- Owner’s Registration Card
• Wheel Kit (ST20K only)
- 8 inch wheel (2)
-Stub Axle (2)
- Washer (2)
-Cotter Pin (2)
- Handle
- Foot Bracket (2)
- M8x40 Flange Bolt (6)
- M8 Flange Nut (4)
4. If you are missing any items from your carton, please
call Generac Customer Service at 1-888-436-3722.
When calling for assistance, please have the model
and serial number from the data tag available.
5. Fill out and send in registration card. Write Model
number, Serial number & date of purchase in the
table located in the “Where to Find Us” section.
Water Pump 9
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General Information
10 Water Pump
Section 4 Set-up
4.1 — ASSEMBLY
Read entire operator’s manual before you attempt to
assemble or if you have any problems with the assembly
of your water pump, please call Generac Customer Service at 1-888-436-3722. When calling for assistance,
please have the model and serial number from the data
tag available.
If the water pump does not include a wheel kit, skip
to “Add Engine Oil”.
You will need the following tools to install the vibration
mounts and handle:
• Socket wrench with 12 mm socket (not included)
1. Attach Vibration Mounts (feet) (Figure 4-1).
A. Attach the vibration mount to the frame using 2
Flange Bolts (M8x40) and 2 Nuts (M8).
B. Slide the bolts through the vibration mount and
through the frame.
C. Secure with nuts. Tighten, but do not over tighten.
D. Repeat A-C for the second vibration mount.
Figure 4-2. Attach Handle
3. Attach wheels (Figure 4-3).
A. Slide the axle through the wheel, washer, and
then the mount point on the frame.
B. Insert the cotter pin through the hole in the end of
the axle.
C. Repeat A-B for the second wheel.
Figure 4-1. Vibration Mounts
2. Attach Handle (Figure 4-2).
A. Place the handle over the mounting plate of the
frame.
B. Secure the handle to the frame using 2 Flange
Bolts (M8x40).
Water Pump 11
Figure 4-3. Attach Wheels
4.2 — ADD ENGINE OIL
Acceptable Oil
Level Range
Set-up
1. Place water pump on a flat, level surface.
2. Clean area around oil fill and remove ORANGE oil fill
cap/dipstick.
3. Using oil funnel, slowly pour oil into fill opening. See
“Maintenance” section for oil type recommendation.
4. Check periodically until the oil level is between “L”
and “H” on the dipstick (Figure 4-4). Do not overfill.
Figure 4-4. Dipstick
NOTE: Any attempt to crank or start the engine
before it has been properly serviced with the recommend oil may result in engine failure.
5. Replace oil fill cap/dipstick and fully tighten.
Fuel and its vapors are extremely flammable and explosive. Fire or explosion can
cause severe burns or death.
4.3.1 — ADDING FUEL
• Turn water pump OFF and let it cool at least two (2)
minutes before removing fuel cap. Loosen cap slowly
to relieve pressure in tank.
• Fill fuel tank outdoors.
• DO NOT overfill tank. Allow space for fuel expansion.
• If fuel spills, wait until it evaporates before starting
engine.
• Keep fuel away from sparks, open flames, pilot lights,
heat, and other ignition sources.
• DO NOT light a cigarette or smoke.
1. Clean area around fuel fill cap, remove cap.
2. Slowly add regular unleaded fuel to fuel tank. Be
careful not to overfill. Fill to red indicator ring on the
fuel filter, this will allow for fuel expansion
(Figure 4-5).
3. Install fuel cap and let any spilled fuel evaporate
before starting engine.
4.3 — FUEL
Fuel must meet these requirements:
• Clean, fresh, unleaded gasoline.
• A minimum of 87 octane/87 AKI (91 RON).
• Gasoline with up to 10% ethanol (gasohol) is acceptable.
NOTE: Avoid water pump damage. Failure to follow
Operator’s Manual for fuel recommendations voids
warranty.
• DO NOT use unapproved gasoline such as E85.
• DO NOT mix oil in gasoline.
• DO NOT modify engine to run on alternate fuels.
To protect the fuel system from gelling, mix in a fuel stabilizer when adding fuel. See Storage. All fuel is not the
same. If you experience starting or performanc e pr ob lems after using fuel, switch to a different fuel p rovider or
change brands.
Figure 4-5. Adding Fuel
12 Water Pump
Set-up
4.4 — CONNECT SUCTION AND
ISCHARGE HOSE
D
1. Attach and thread a gasket and hose barb to each of
the threaded flanges using a hose nut (Figure 4-6).
4. Attach the filter to the suction hose by inserting the
barb end into the suction hose and securing with a
hose clamp. Then attach the filter end (Figure 4-8).
Figure 4-8. Attach Filter
4.5 — PRIME THE UNIT
Remove the Easy Prime cap from the pump and completely fill the pump chamber with clean water. Tighten
the cap. DO NOT over tighten.
Figure 4-6. Attach Gasket and Hose Barb
2. Attach the flexible blue discharge hose to the blue
colored flange by sliding the hose over the barb and
securing with a hose clamp.
3. Attach the green suction hose to the green colored
flange by sliding the hose over the barb and se curing
with a hose clamp (Figure 4-7).
Figure 4-7. Attach Hoses
Water Pump 13
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Set-up
14 Water Pump
5 Foot Minimum
Section 5 Operation
5.1 — OPERATION
If you have any problems operating your water pump,
please call Generac customer service at
1-888-436-3722.
5.2 — WATER PUMP LOCATION
5.2.1 — Clearances and Air Movement
Running engine gives off carbon monoxide,
an odorless, colorless, poisonous gas.
Breathing carbon monoxide can caus e he ad ache, fatigue, dizziness, vomiting, confusion,
seizures, nausea, fainting or death. For more
information, reference the CO warnings in the
“Safety” section.
Place water pump outdoors in an area that will not accumulate deadly exhaust gas. NEVER place water pump
where exhaust gas could accumulate and enter inside or
be drawn into a potentially occupied building. Ensure
exhaust gas is kept away from any windows, doors, ventilation intakes, or other openings that can allow exhaust
gas to collect in a confined area. Prevailing winds and air
currents should be taken into consideration when positioning water pump (Figure 5-1).
• Operate water pump ONLY outdoors.
• Keep exhaust gas from entering a co nf in e d ar ea
through windows, doors, ventilation intakes, or other
openings.
• NEVER start or run engine indoors, in a vehicle or in
an enclosed area, EVEN if windows and doors are
open.
Figure 5-1. Building Clearances
Place the pump on a level surface free from any obstructions or potential hazards. The pump should be placed
close to the water level to ensure maximum performance.
Pump output will be affected by the type, length, and size
of the suction and discharge hoses. The pumping height,
total head, is the distance from the water level to the
point of discharge (Figure 5-2). As this distance
increases, the pump output decreases. The discharge
capacity is greater than the suction capacity, therefore it
is important to keep the suction head less than the discharge head. The time required to draw water from the
source to the pump (self-priming time) can be decreased
by minimizing the suction head.
Exhaust heat/gases can ignite combustibles, structures or damage fuel tank
causing a fire.
• Keep at least 5 ft. (152 cm) clearance on all sides of
water pump including overhead.
Figure 5-2. Pump Output
Water Pump 15
Operation
B
A
C
ACB
D
Route the suction hose so that the filter is immersed
completely in the water supply source. DO NOT operate
pump without the filter fully immersed. DO NOT operate
the pump without the filter attached to the hose. Secure
the suction hose to keep it from moving once the Water
Pump is turned on.
Route the discharge hose to the desired location. Se cure
the discharge hose to keep it from moving once the
Water Pump is turned on.
5.3 — CHECKLIST BEFORE STARTING
NGINE
E
1. Be sure to read and understand the “Safety” section
and “Operation” section before using water pump.
2. Check that the oil is at the full mark on the dipstick,
and that fuel has been added to the fuel tank.
3. Review the unit’s assembly and ensure fitting are
properly secured and make sure there ar e no kinks,
cuts, or damage to hoses.
4. Confirm unit is secure on level ground and surrounding work area is clear.
NOTE: For the ST20K model, pumping water with solids larger than .25" can damage the pump and void
the warranty.
5.4 — HOW TO START YOUR WATER PUMP
NOTE: DO NOT run the pump without the unit primed
and suction hose in the water. Damage to equipment
resulting from failure to follow this instruction will
void warranty.
6. When engine starts, slowly move choke lever to RUN
position as engine warms. If engine falters, move
choke lever to CHOKE position, then back to RUN
position.
7. If engine fails to start after five (5) pulls, move choke
lever to RUN position, and repeat steps 4 through 7.
Figure 5-3. Start the CW15 Water Pump
5.4.2 — Starting the ST20 Water Pump
1. Move fuel valve lever (A) to ON position (Figure 5-4).
2. Move choke lever (B) to CHOKE position.
A. For a warm engine, be sure the choke lever is in
the RUN position.
5.4.1 — Starting the CW15 Water Pump
1. Flip engine switch (A) to the ON position (Figure 5-3).
2. Move choke lever (B) to CHOKE position.
A. For a warm engine, be sure the choke lever is in
the RUN position.
3. Secure unit from movement when pulling starter handle (C).
Figure 5-4. Start the ST20 Water Pump
Starter cord kickback (rapid retraction) can
result in bodily injury. Broken bones, fractures, bruises, or sprains could result.
4. When starting the engine, grasp starter grip handle
and pull slowly until you feel some resistance. Then
pull rapidly to start engine.
5. Return starter grip handle slowly. DO NOT let rope
“snap back” against starter.
3. Move throttle control lever (C) to “High” (Rabbit) position (Figure 5-6).
4. Turn the engine switch (D) to ON position
(Figure 5-5).
5. Secure unit from movement when pulling starter handle (E) (Figure 5-5).
16 Water Pump
Operation
E
D
Starter cord kickback (rapid retraction) can
result in bodily injury. Broken bones, fractures, bruises, or sprains could result.
6. When starting engine, grasp starter grip handle and
pull slowly until you feel some resistance. Then pull
rapidly to start engine.
7. Return starter grip handle slowly. DO NOT let rope
“snap back” against starter.
8. When engine starts, slowly move choke l ever to RUN
position as engine warms. If engine falters, move
choke lever to CHOKE position, then back to RUN
position.
9. If engine fails to start after 5 pulls, move choke lever
to RUN position, and repeat steps 6 through 9.
• Replacement parts must be the same and installed in
the same position as the original parts.
5.5 — HOW TO STOP YOUR WATER PUMP
1. Move throttle control lever on engine to “Low” (T urtle)
position (Figure 5-6) (if applicable).
2. Turn the engine ON/OFF switch to the OFF (0) posi-
tion.
3. Turn the fuel valve to the OFF (0) position (if applica-
ble).
4. Allow the engine to cool thoroughly.
5. After cooling, remove the priming plug and drain plug
from the pump casing and allow it to drain completely.
Never operate a damaged or defective pump.
To prevent accidental starting, remove and
ground the spark plug wire before pe rformin g
any service.
Figure 5-5. Start the ST20 Water Pump
NOTE: It is normal for the Water Pump to fluctuate
speed while the system is self priming du e to ai r
pockets in the suction hose.
Contact with muffler area can result in
serious burns. Exhaust heat/gases can
ignite combustibles, structures or
damage fuel tank causing a fire.
• DO NOT touch hot parts and AVOID hot exhaust
gases.
• Allow equipment to cool before touching.
• Keep at least 5 feet (152 cm) of clearance on all sides
of water pump including overhead.
• It is a violation of California Public Resource Code,
Section 4442, to use or operate the engine on any forest-covered, brush-covered, or grass-covered land
unless the exhaust system is equipped with a spark
arrester, as defined in Section 4442, maintained in
effective working order. Other states or federal jurisdictions may have similar laws.
NOTE: The owner/operator is responsible for all periodic maintenance. Complete all scheduled maintenance in a timely manner. Correct any issues before
operating the pump. Improper maintenance will void
the pump's warranty.
Figure 5-6. Throttle Position
Water Pump 17
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Operation
18 Water Pump
Section 6 Maintenance
6.1 — MAINTENANCE RECOMMENDATIONS
Regular maintenance will improve the performance and
extend the life of the water pump. See any qualified
dealer for service.
The water pump’s warranty does not cover items that
have been subjected to operator abuse o r negligence. To
receive full value from the warranty, the operator must
maintain the water pump as instructed in this manual,
including proper storage as detailed in and “Long Term
Storage”.
NOTE: Should you have questions about replacing
components on your water pump, please call
1-888-436-3722 for assistance.
Some adjustments will need to be made periodically to
properly maintain your water pump.
All service and adjustments should be made at least
once each season. Follow the requireme nts in the “Maintenance Schedule” chart.
NOTE: Once a year you should clean or replace the
spark plug, clean or replace the air filter, and check
the hoses for wear . A new sp ark plug and clean air filter assure proper fuel-air mixture and help your
engine run better and last longer.
6.2 — MAINTENANCE SCHEDULE
Follow the hourly or calendar intervals, whichever occurs
first. More frequent service is required when operating in
adverse conditions.
First 5 Hours
Change engine oil
Every 8 Hours or Daily
Check/clean air filter and suction hose filter*
Check hoses
Check hose connections for leaks
Clean debris off water pump
Check engine oil level
Every 20 Hours or Every Season
Change engine oil**
Every 50 Hours or Every Season
Check/clean air cleaner filter**
Inspect muffler and spark arrester*
Every 100 Hours or Every Season
Service spark plug
* Clean if clogged. Replace if broken.
** Service more often under dirty or dusty conditions.
6.3 — EMISSIONS CONTROL
Maintenance, replacement, or repair of th e emissions
control devices and systems may be performed by
any non-road engine repair establishment or individual. However, to obtain “no charge” emissions control
service, the work must be performed by a factory authorized dealer. See the Emissions Warranty.
Water Pump 19
Maintenance
SA E 30 *
10 W- 30 **
5W -3 0
6.4 — WATER PUMP MAINTENANCE
6.4.1 — Clean Debris
Daily or before use, clean accumulated debris from water
pump. Keep linkage, spring and controls clean. Keep
area around and behind muffler free from an y combustible debris. Inspect cooling air slots and openings on the
water pump. These openings must be kept clean and
unobstructed.
Water pump p arts should be kept clean to reduce the risk
of overheating and ignition of accumulated debris.
• Use a damp cloth to wipe exterior surfaces c lea n.
NOTE: Improper treatment of water pump can damage it and shorten its life.
• DO NOT insert any objects through cooling slots.
• Use a soft bristle brush to loosen caked on dirt, oil, etc.
• Use a vacuum cleaner to pick up loose dirt and debris.
6.5 — CHECK HOSE FILTER
Examine the filter on the suction hose. Clean it if the slots
are clogged or replace it if filter is damaged.
Outdoor temperatures determine the proper oil viscosity
for the engine. Use the chart to select the best viscos ity
for the outdoor temperature range exp ect ed .
SAE 30*
10W-30**
5W-30
* Below 50 °F (10 °C) the use of SAE 30 will result in hard
starting.
** Above 80 °F (27 °C) the use of 10W30 may cause increased
oil consumption. Check oil level more frequently.
NOTE: The ST20K engine is equipped with an "Oil
Alert System". This system will automatically stop
the engine before the oil level falls below a safe limit.
To avoid the inconvenience of an unexpected shutdown, always check the engine oil level before
startup.
6.6 — CHECK HOSES
The hoses can develop leaks from wear, kinking, or
abuse. Inspect the hoses each time before using them.
Check for cuts, leaks, abrasions or bulging, damage or
movement of couplings. If any of these conditions exist,
replace the hose.
6.7 — ENGINE MAINTENANCE
Unintentional sparking can result in fire
or electric shock.
WHEN ADJUSTING OR MAKING REPAIRS TO YOUR
WATER PUMP
• Disconnect the spark plug wire from the sp ark plug and
place the wire where it cannot contact sp ark plug.
WHEN TESTING FOR ENGINE SPARK
• Use approved spark plug tester.
• DO NOT check for spark with spark plug removed.
6.8.1 — Check Oil Level
Oil level should be checked prior to each use or at least
every 8 hours of operation. Keep oil level maintained.
1. Make sure water pump is on a flat, level surface.
2. Clean area around oil fill and wipe dipstick clean
remove oil fill cap (Figure 6-1).
3. Verify oil is at the proper level on the dipstick.
4. Replace and tighten oil fill cap.
Figure 6-1. Fill Engine Oil
6.8 — ENGINE OIL RECOMMENDATIONS
We recommend the use of high-quality detergent oils
acceptable if classified for service SF, SG, SH, SJ or
higher. DO NOT use special additives.
20 Water Pump
Maintenance
Acceptable Oil
Level Range
A
A
6.8.2 — Adding Engine Oil
1. Make sure water pump is on a flat, level surface.
2. Check oil level as described in Checking Oil Level.
3. If needed, slowly pour oil into oil fill opening until the
proper level on the dipstick is reached.
4. Insert the dipstick into filler neck but do not screw it
in.
5. If level is low, fill until the oil level is between “L” and
“H” on the dipstick (Figure 6-2).
6. Replace and tighten oil fill cap.
Figure 6-2. Dipstick
5. Remove oil drain plug and drain oil completely into a
suitable container.
6. Reinstall oil drain plug and tighten securely.
7. Slowly pour oil into oil fill opening to the proper level
on the dipstick. DO NOT overfill.
8. Reinstall oil fill cap. Finger tighten cap securely.
9. Wipe up any spilled oil.
10. Properly dispose of oil in an accordance with all local
regulations.
Figure 6-3. CW15 Oil Drain Plug
6.8.3 — Changing Engine Oil
If you are using your water pump under extremely dir ty or
dusty conditions, or in extremely hot weather , change the
oil more often.
Avoid prolonged or repea ted skin cont act with
used motor oil.
• Used motor oil has been shown to cause skin cancer in
certain laboratory animals.
• Thoroughly wash exposed areas with soap and water.
KEEP OUT OF REACH OF CHILDREN.
• Don’t pollute. Conserve resources. Return used oil to
collection centers.
Allow the engine to cool down and then change oil as follows:
1. Make sure water pump is on a flat, level surface.
2. Disconnect the spark plug wire from the spark plug
and place the wire where it cannot contact spark
plug.
3. Clean area around oil drain plug (A) (Figure 6-3) and
(Figure 6-4). The oil drain plug is located at base of
engine.
4. Remove oil fill cap (Figure 6-1).
Figure 6-4. ST20 Oil Drain Plug
6.9 — SERVICE AIR CLEANER
Your engine will not run properly and may be damaged if
you run it with a dirty air cleaner. Service more often if
operating under dirty or dusty conditions.
To service the air cleaner, follow these steps:
1. Remove air cleaner screw(s), and pull off the air
cleaner cover (Figure 6-5) and (Figure 6-6).
2. Remove old foam filter and replace with a clean new
foam filter.
3. Install cover and insert air cleaner screw(s).
Water Pump 21
Figure 6-7. Spark Plug Gap
FOAM FILTER
ELEMENT
AIR CLEANER
COVER
AIR CLEANER
SCREWS
FOAM FILTER
ELEMENT
AIR CLEANER COVER
AIR CLEANER SCREW
6.11 — AFTER EACH USE
Maintenance
Figure 6-5. Service the CW15 Air Cleaner
Figure 6-6. Service the ST20 Air Cleaner
6.10 — SERVICE SPARK PLUG
Changing the spark plug will help your engine to start
easier and run better.
1. Clean area around spark plug.
2. Remove and inspect spark plug.
3. Check electrode gap with wire feeler gauge and reset
spark plug gap to recommended gap if necessary
(see Specifications) (Figure 6-7).
4. Replace spark plug if electrodes are pitted, burned or
porcelain is cracked. Use the recommended replacement plug. See Specifications.
5. Install spark plug and tighten firmly.
Water should not remain in the unit for long periods of
time. Sediments or minerals can deposit on pump parts
and freeze pump action. Follow these procedures after
every use:
1. Shut off engine.
2. Disconnect hoses. Drain water from hose. Use a rag
to wipe off the hose.
3. Empty pump of all liquids. Remove drain cap, let
drain completely, replace drain cap.
4. Store unit in a clean, dry area.
5. If storing for more than 30 days, see the “Long Term
Storage”.
Fuel and its vapors are extremely flammable and explosive. Fire or explosion
can cause severe burns or death.
WHEN STORING FUEL OR EQUIPMENT WITH FUEL
IN TANK
• Store away from furnaces, stoves, water heaters,
clothes dryers, or other appliances that have pilot light
or other ignition source because they can ignite fuel
vapors.
6.12 — LONG TERM STORAGE
If you do not plan to use the water pump for more than 30
days, you must prepare the engine and pump for long
term storage.
6.12.1 — Protect Fuel System
Fuel can become stale when stored over 30 days. Stale
fuel causes acid and gum deposits to form in the fuel system or on essential carburetor parts. To keep fuel fresh,
use a fuel stabilizer , available as a liquid additive or a drip
concentrate cartridge.
22 Water Pump
Maintenance
There is no need to drain gasoline from the engine if a
fuel stabilizer is added according to instructions. Run the
engine for 2 minutes to circulate the stabilizer throughout
the fuel system. The engine and fuel can then be stored
up to 24 months.
If gasoline in the engine has not been treated with a fuel
stabilizer, it must be drained into an approved container.
Run the engine until it stops from lack of fuel. The use of
a fuel stabilizer in the storage container is recommended
to maintain freshness.
Hearing Protection Recommended.
6.12.2 — Protect Engine
1. Change engine oil.
2. Remove spark plug.
3. Pour a tablespoon (5-10 cc) of clean engine oil into
the cylinder.
4. Pull the starter rope several times to distribute the oil
in the cylinder.
5. Reinstall the spark plug.
6. Pull the starter rope slowly until resistance is felt.
This will close the valves so moisture cannot enter
the engine cylinder. Return the starter rope gently.
6.13 — OTHER STORAGE INSTRUCTIONS
1. DO NOT store fuel from one season to another
unless it has been treated as described in Protect
Fuel System.
2. Replace fuel container if it starts to rust. Rust and/or
dirt in fuel can cause problems if it’s used with this
unit.
3. Cover unit with a suitable protective cover that does
not retain moisture.
Storage covers can be flammable.
• DO NOT place a storage cover over a hot water pump.
• Let equipment cool for a sufficient time before placing
the cover on the equipment.
4. Store unit in a clean and dry area.
6.14 — TRANSPORTING/TIPPING OF THE
NIT
U
Do not operate, store or transport the unit at an angle
greater than 15 degrees.
6.12.3 — Change Oil
Allow the engine to cool down and then drain oil from
crankcase. Refill with recommended grade. See “Changing Engine Oil”.
Hot oil may cause burns. Allow engine to cool
before draining oil. Avoid prolonged or
repeated skin exposure with used oil. Thoroughly wash exposed areas with soap.
6.12.4 — Protecting the Pump
To protect the pump from damage caused by mineral
deposits or freezing. Make sure the pump is completely
drained of all water. Spray WD-40, or similar product, into
all ports and drainage hole.
• Failure to do so will permanently damage your pump
and render your unit inoperable.
• Freeze damage is not covered under warranty.
Water Pump 23
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Maintenance
24 Water Pump
Section 7 Troubleshooting
7.1 — TROUBLESHOOTING GUIDE
PROBLEM CAUSE CORRECTION
1. Air leak in suction hose.
Pump will not pump.
Pump will not prime. 1. Excessive suction lift (*1). 1. Move the pump closer to liquid source.
2. The suction and/or discharge line(s) may be
blocked.
3. The end of the suction line is not submerged.
4. Total head is too high for this pump to work
against
1. Make sure suction hose is double clamped at joints,
clamps are tight, fittings have thread compound and
are tight, with no nicks or cuts in hose.
2. Check to see that the hoses and filter are in good
working order.
3. Increase its length, or move pump closer to source
of liquid.
4. Reduce total head or use a higher head pump.
Priming takes a long time.
Pump does not perform as
well as it should.
Pump loses prime.
Pump will not start.
Pump starts, but runs roughly.
1. Suction line is quite long.
2. Air pockets or leaks in the suction line.
1. Flow is restricted due to debris build-up.
2. Insufficient submergence of the end of suction
hose.
3. Excessively worn impeller (*2).
4. Seal is damaged (*3). Liquid will be leaking
through the middle of the adapter.
5. Air pockets or leaks in the suction hose.
6. Clogged impeller.
7. Engine throttle is in SLOW position.
1. Water level drops below the end of the suction
line.
1. No fuel.
2. Faulty spark plug.
3. Fuel valve lever is in the OFF position.
4. Ignition switch is in the OFF position.
5. Choke is in the wrong position.
1. Choke is in the wrong position.
2. Spark plug wire is loose.
3. Faulty spark plug.
4. Fuel is contaminated (water, debris, etc.).
1. Move pump closer to source.
2. Check the line for loose connections. Make sure
suction hose is submerged.
1. Clean the hoses, fittings and filter.
2. The end of the suction line must be submerged.
3. Replace impeller.
4. Replace the seal.
5. Check suction hose.
6. Remove casing to clean out.
7. Move throttle to FAST position.
1. Increase length of suction line or move the pump
closer to the water source.
1. Allow engine to cool for 2 minutes, then fill fuel tank.
2. Replace spark plug.
3. Turn the fuel valve lever to the ON position.
4. Turn the ignition switch to the ON position.
5. Slide choke lever to the CHOKE position.
1. Slide choke lever to the RUN position.
2. Attach wire to spark plug securely.
3. Replace spark plug.
4. Allow engine to cool for 2 minutes, then drain fuel
tank and carburetor. Fill tank with fresh fuel.
Pump shuts down during
operation.
1. Excessive suction lift must take into consideration:
A. Size and length of pipe
B. Pipe fitting
C. Elevation above sea level
Including all of the above, we recommend that the total suction head not
exceed 26 ft.
1. No fuel.
2. Low oil sensor shuts down unit.
2. An excessively worn impeller is mainly caused from cavitation,
3. The seal may be damaged due to:
Contact an authorized service depot for further assistance.
1. Allow engine to cool for 2 minutes, then fill fuel tank.
2. Make sure unit is on flat surface. Check oil level and
add more if necessary.
which is caused by a number of situations, such as:
A. Restricted suction
B. Excessive suction lift
A. Normal wear
B. Overheating
C. Pumping chemicals that this seal is not designed for.
Water Pump 31
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Troubleshooting
32 Water Pump
Part No. 0K9077 Rev A 10/02/14
© Generac Power Systems, Inc. All rights reserved
Specifications are subject to change without notice.
No reproduction allowed in any form without prior written
consent from Generac Power Systems, Inc.
Generac Power Systems, Inc.
S45 W29290 Hwy. 59
Waukesha, WI 53189
1-888-GENERAC (1-888-436-3722)
generac.com
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