Waterax STRIKER-2/3 User manual

STRIKER-2/3
Owner's Manual
Publication Date: 09/2015
Publication Number: 701223, Rev. 3

This document provides information proprietary to WATERAX Inc. and cannot be used
or disclosed without WATERAX’s written authorization.
WATERAX Inc. reserves the right to make changes without notice in its products or
components as research and development or marketing conditions warrant. Changes
affecting the operation of any component in this manual will be reflected in a subsequent
revision. WATERAX Inc. assumes no responsibility for any omissions or errors that may
appear in this document or for any damages that may result from the use of information
contained herein.
The following are trademarks or brand names of WATERAX Inc.: WATERAX, ‘WE
MOVE WATER’. All other trademarks used in this manual are the exclusive property of
their owner.
STRIKER-2/3 Owner's Manual
Publication No.: 701223, Rev. 3
Publication Date: 09/2015
First Edition: March 2015
Published by:
WATERAX Inc.
6635 Henri-Bourassa W.
Montreal, Quebec, CANADA
H4R 1E1
Copyright © 2015 WATERAX Inc.
All rights reserved
Printed in Canada

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Contents
Important Safety Instructions............................................................................................2
Personal Safety Advisory .................................................................................................................. 2
Warnings ........................................................................................................................................... 2
Preventing Damage to Equipment ....................................................................................3
Introduction ........................................................................................................................4
About this Manual ............................................................................................................................. 4
Abbreviations and Terms .................................................................................................................. 4
About the STRIKER-2/3 Series......................................................................................................... 5
Parts Identification............................................................................................................................. 6
Installation ..........................................................................................................................6
Plumbing ........................................................................................................................................... 6
Pump End Mounting.......................................................................................................................... 6
Fastening to Truck/Apparatus ........................................................................................................... 7
Installing a Control Panel .................................................................................................................. 7
Using a Battery for Electric Starters and Control Panels .................................................................. 7
Operating STRIKER-2/3 Series Pumps .............................................................................8
Pre-Operation Checklist .................................................................................................................... 8
Flooded Suction ................................................................................................................................ 8
Drafting.............................................................................................................................................. 9
Priming the Pump............................................................................................................................ 10
Startup and Discharge .................................................................................................................... 11
Shutdown ........................................................................................................................................ 11
Cold Weather Operation ................................................................................................................. 12
Basic Care and Storage .................................................................................................................. 12
Troubleshooting .............................................................................................................................. 13
Service ..............................................................................................................................15
Drive Assembly Parts Breakdown................................................................................................... 15
Installing the Drive Assembly .......................................................................................................... 16
Removal of Pulley Assembly........................................................................................................... 19
Removing or Attaching the Pump End ............................................................................................ 19
Pump Tool Kit.................................................................................................................................. 20
Disassembly Procedure for Pump End 18-16S .............................................................................. 20
Assembly Procedure for Pump End 18-16S ................................................................................... 21
Pump Clamp.................................................................................................................................... 22
STRIKER-2/3 Wiring ....................................................................................................................... 23
FastWire Wiring Diagrams .............................................................................................................. 24
Pump End Technical Data................................................................................................25
Warranty............................................................................................................................29

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Important Safety Instructions
It is recommended that all information provided in this manual be carefully read and
understood before performing any operation of or maintenance to the pump.
The procedures listed in this manual are general operating and maintenance procedures.
They should be taken in addition to any procedures, policies and guidelines established
by the authority having jurisdiction or the apparatus manufacturer. Where conflicts arise,
all parties (authority having jurisdiction, the apparatus manufacturer, and WATERAX Inc.)
will need to be contacted to determine the best resolution. The solution will need to
address the safety of the operator along with the proper performance and life expectancy
of the unit.
Personal Safety Advisory
READ YOUR ENGINE MANUAL FIRST!
Before proceeding further, locate and read the engine manufacturer’s manual. It contains
very important safety information that MUST be read, understood and followed to
safeguard you and your equipment from harm, as well as specific information on the
proper use and care of your engine.
READ THIS MANUAL BEFORE OPERATING YOUR PUMP!
The improper use of the WATERAX pump could result in serious injuries as well as
damage to the pump. Any operator should familiarize himself with the apparatus and its
capabilities before trying to operate the equipment in an emergency situation. Please read
this entire manual before using your WATERAX pump and follow all Personal Safety
Advisories.
Warnings
Always wear eye and ear protection when operating the pump unit.
Do not operate if mentally or physically fatigued.
Always inspect hoses and piping to avoid burst injuries.
Use only pipe, hose, and fittings that are rated at or above the maximum pressure
rating of the pump shown below, or according to what maximum pressure the system
was designed for, whichever is lower.
Maximum Allowable Pressure STRIKER-2/3: 600 PSI (41 bar)
Maximum Allowable Pump Intake Pressure STRIKER-2/3: 150 PSI (10 bar)
No modifications and/or alterations may be made to the pump. Any such modifications
not only void the pump warranty but can make the unit dangerous to anyone operating
the pump.
Do not operate the pump higher than the maximum rated pressure. Always run the unit
at the lowest pressure required for the application to enhance operator and equipment
safety.
Slowly close valves and use slow close valves wherever possible to prevent danger to
other line operators and to prevent water hammer which could damage the pump and
its piping components.
Relieve all system pressure before doing any service work on the pump.
Never run the pump in a closed or confined area. Exhaust gas contains carbon
monoxide which is poisonous to humans. Avoid inhalation of exhaust gas.
Refuel engine with care. Gasoline and diesel are flammable, and gasoline vapor can
explode. Refuel in a well-ventilated area, with the engine stopped.
Be alert and never touch any part of the engine exhaust system (muffler, shield,
header pipes, etc.) while the engine is running. Always allow enough time, after
stopping the unit, for proper cooling of the muffler and surrounding parts.

WATERAX STRIKER-2/3 Owner's Manual
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Do not ground the battery (if applicable) through the pump’s frame members; always
ground to a bare metal (unpainted) part of the engine block to ensure proper ground.
Preventing Damage to Equipment
The following recommendations will help avoid damage to your equipment:
Flush the pump with fresh water if the pump has been used to pump salty, brackish,
high mineral content water, water containing debris, or foam injected water. Check that
debris is cleared before using pump again.
Always draft water using a suction hose strainer.
During freezing weather, drain the pump, manifolds, and lines of all water. You can
also pour some antifreeze into the pump and circulate it through the pump and
plumbing system.
Let the engine warm up before using the unit at full speed.
Always use the proper unleaded gasoline or diesel fuel as recommended in the engine
manufacturer’s manual.
Always check for sufficient oil quantity in the engine crankcase before use (see engine
manual for details on checking the oil level, as well as for the type of oil to use).
If applicable, always check for sufficient coolant quantity in the engine radiator before
use (see engine manual for details on checking the coolant level, as well as for the
type of coolant to use).
Pumps should not be operated without water for any extended period of time or without
discharging water. Operating the pump in such a manner can overheat the pump
causing damage to seals, or pump internals.
It is recommended that all fasteners be replaced with genuine WATERAX parts.
When mounting manifolds to the pump, the manifolds must be self-supporting and
coupled to the pump by means of a flex coupling such as a Victaulic®coupling or flex
hose.
When hoisting the pump onto an apparatus, take care when using lifting hooks (if
applicable) and avoid any contact with components adjacent to the fixation points.
Never disconnect the battery (if applicable) while the engine is running, as this may
damage the control panel’s electrical components.

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Introduction
About this Manual
This manual contains general operation, care and servicing procedures for the following
WATERAX STRIKER-2/3 high pressure centrifugal pumps:
Pump designation
Engine used
STRIKER-2
Honda GX390 13HP gasoline engine
STRIKER-3
Honda GX390 13HP gasoline engine
These instructions cover most wildland and municipal pump applications. If the application
the pump is being used for does not fall into these general guidelines, consult WATERAX
Inc. for any additional safeguards, operating, or maintenance considerations that may be
required.
For full service and maintenance instructions regarding the pump, please refer to the
Service section. For maintenance instructions regarding the engine, as well as for oil and
fuel recommendations, refer to the engine manufacturer’s manual.
Please see www.waterax.com additional documentation related to this product such as
the WATERAX product guide, technical notes, links to the engine manufacturer’s
manuals, news and other updates about WATERAX and its goods and services.
Abbreviations and Terms
The following terms and abbreviations are used in this manual:
Cavitation
Formation of air bubbles in a liquid inside a centrifugal pump,
causing low pressure points and loss of pump capacity.
Dead-heading
Also called shut-off. Leaving the pump running with all the
discharge valves closed. The pump should not be left in this
mode for more than a minute since the pump can overheat and
become damaged. To avoid this, a re-circulation line (if
provided) should be opened or a discharge line left slightly open
to allow fresh water to continue to enter the pump.
Drafting
Process of using vacuum (suction) to take water from a stream
or impoundment.
NH
National Hose. This is a type thread specified in NFPA 1963.
Formerly known as NST (National Standard Thread).
NPSH
National Pipe Straight Hose. This is a type of thread that is
slightly smaller in diameter than NH, with more threads per inch
than the same nominal size of NH thread. NPSH is also called
IPT (Iron Pipe Thread).
RPM
Revolutions Per Minute.

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About the STRIKER-2/3 Series
Features
For full specifications and performance curves, see the Product Data Sheet for your
pump end model.
Applications of the WATERAX STRIKER-2/3 series include:
Slip-on units
Attack line firefighting
Long hose lay for remote watering during firefighting operations
High elevation firefighting in mountainous areas
Accuracy in flow trajectory when structure firefighting
Tandem pumping over long distances
Parallel pumping for higher volumes
Features and Benefits of the WATERAX STRIKER-2/3 series include:
Quick release clamp and swappable pump ends for minimal equipment downtime and
inventory
Sealed bearing to eliminate pump end greasing in the field
Belt drive system for reliable, low maintenance performance
Aluminum alloy pump components and anodized parts for lighter weight and greater
resistance to corrosion
Compatible with foam applications
Blister resistant mechanical rotary seal
Comprehensive manuals
EPA Certified
Configurations
The STRIKER-2/3 series is used for a variety of wildland and municipal firefighting
applications. Your model may be configured as a portable, standalone pump installed on
a carry frame, or it may be purchased in the vehicle-mount configuration which includes
a mounting frame or legs to fasten the pump onto a fire apparatus.

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Parts Identification
STRIKER-2/3
A. Pump intake (suction)
B. Pump drain port (not shown)
C. Priming valve
D. Quick release pump clamp
E. Discharge check valve*
F. Pump discharge
G. Hand primer*
H. Ignition switch
I. Recoil starter
J. Fuel cap
K. Throttle (not shown)
L. Fuel valve (not shown)
M. Choke (not shown)
N. Muffler
Note: Portable 2-stage STRIKER-2 pump model
shown. Other configurations available for both 2-
stage STRIKER-2 and 3-stage STRIKER-3 pumps.
* Available on portable models.
C
A
F
H
K
L
N
E
G
M
I
J
D
B
Installation
Depending on your model and configuration ordered, you may require additional
accessories from WATERAX or from third-party vendors, for example, control panels,
batteries, and fuel lines. You will also require hoses and nozzles as well as other fire
apparatus plumbing which can be purchased through your WATERAX representative.
Follow the instructions and heed all warnings in any documentation that you receive with
the accessories you purchase.
Plumbing
When mounting manifolds to the pump, the manifolds must be self-supporting and
coupled to the pump by means of a flex coupling such as a Victaulic® coupling or flex
hose.
Pump End Mounting
The pump end can be rotated to aid with the apparatus piping connections. The quick
release pump clamp securely holds the pump end in the desired position. Always ensure
that the water can be drained from the pump end to keep it from cracking in freezing
weather. A drain valve is available from WATERAX (item no 801104).

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Fastening to Truck/Apparatus
When adding any equipment to a vehicle, follow all instructions and heed all warnings
provided by manufacturers of the apparatus and any third-party accessories. WATERAX
provides certain accessories used in vehicle-mount configurations of the STRIKER-2/3
series pumps. Follow all documentation that ships with any accessories you have ordered
such as vibration mounts or rails. Your company’s internal policies and guidelines must
also be followed.
Before installing the pump in a vehicle, plan for adequate access to any fill caps such as
those for oil and fuel, as well as any other part of the pump or engine that is frequently
accessed or inspected (valves, panels, primers, filters, etc.). Make note of components
that become hot when operating such as mufflers and engine blocks, and always ensure
a safe clearance around them.
Installing a Control Panel
See User Instructions shipped with the specific model of control panel you ordered for
your pump.
Using a Battery for Electric Starters and Control Panels
Some STRIKER-2/3 pumps require a battery to power electrical and electronic
components such as; starters, pump primers and control panels. Make sure to follow all
instructions and heed all warnings provided by your battery manufacturer. Refer to the
engine manual for battery requirements. Always follow safety guidelines set out by your
company. Never connect or disconnect a battery to a pump that is operating.

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Operating STRIKER-2/3 Series Pumps
Pre-Operation Checklist
Before using your pump, follow this verification procedure:
1. Visually inspect product
When you first receive your STRIKER-2/3 pump, inspect the product and check for any
damage. Notify the supplier if any damage is found.
2. Check all fluid levels regarding the pump and any related equipment. Before first use,
you must prepare the engine which is shipped dry. Before each subsequent use, check
levels and top up as needed.
Engine/apparatus fuel level
Engine/apparatus oil level
All batteries electrolyte level (not required for sealed batteries)
Refer to the engine manufacturer’s manual for specific instructions
regarding the engine.
3. Check that all suction and discharge hoses are structurally sound and do not leak.
4. Visually inspect any electrical or electronic components for damage.
5. Inspect all safety features and verify that they are in good order before using the pump.
6. Visually inspect the pump’s drive belt and ensure it is in good condition without cracks
or excessive wear.
7. Each time you plan to use the pump, check for damage that may have occurred during
previous use. Notify your manager that the equipment requires repair. Remember that
damaged equipment can expose you to safety hazards.
Flooded Suction
Use this procedure if you are taking water from a hydrant, another pump, or a closed tank.
Be sure to understand and follow all related equipment, apparatus, departmental, and
governmental procedures, policies, recommendations, and guidelines concerning hydrant
connecting and operation before performing this mode of operation.
1. Connect the intake hose to the pump intake or intake piping.
2. Connect opposing end of the hose to the hydrant or water source (a tank may already
be connected). Make sure that all connections are strong and tight and that all pump
valves are closed.
3. Check that all equipment is rated to the proper pressure limits that they will be exposed
to during this mode of operation. DO NOT exceed the maximum intake pressure of the
pump (150 PSI).
4. Slowly open the pump inlet valves allowing the water into the pump body.
5. Slowly open the discharge valves to allow for entrapped air in the piping to escape.
6. Once all the air has escaped, close any opened valves so that the unit may be started.
7. Go to the Startup and Discharge section of this manual to begin pumping water.
The pump will not discharge more water than the capacity of the water source
(hydrant). The pressure reading on the pump’s master intake gauge should never
fall below 0 PSI during the pump operation in this mode.

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Drafting
Before you draft
Pumps should not be run dry, and therefore the pump ends require priming prior to
operation. Use this procedure if you are drafting water from an open tank or natural water
source.
To maintain optimum performance from your pump, follow these recommendations for
selecting and installing your suction hose or pipe:
Use the shortest length possible, i.e., place the pump as close to the water as
possible.
Select reinforced crush resistant (non-collapsible) hose or pipe.
Make sure that all pipes have air tight fittings.
To avoid air locks, flexible hose should rise gently from the water source to the
suction/inlet port without excessive dips, bumps, sharp angles or rise in its lay.
Pipes should be equal to or larger than the diameter of the suction/inlet port.
Suction strainers should be fitted to prevent foreign matter from entering the
pump.
Where practicable, the installation and use of a suction float will aid in the
performance of your pump, by keeping suction away from the debris on the
bottom of the dam or river.
Ensure that the suction hose is completely submersed.
Limitations
Several factors can affect the pump’s ability to efficiently draft water. The following
limitations should be taken into account.
Water temperatures above 35 °C (95 °F) can cause noticeable loss in pump
performance.
Barometric pressures below 98 kPa (29 in of Hg) can also cause noticeable loss
in pump performance (specifically elevations >2000 feet above sea level).
Pump performance curves are based off a 5 foot lift (top of water source to
impeller center). Lifts greater than 5 feet will decrease the pump’s performance.
Hose and strainer sizes that are too restrictive can significantly decrease the
pump’s performance.
Intake hose runs in excess of 10 feet can also reduce pump performance.
Drafting connections
1. Connect a suction line to the pump intake.
2. Install a footvalve suction strainer on the other end of the suction hose and place in
the water source.
Note: To provide proper operation of the pump, the suction hose/strainer should be submerged
a minimum of 4 to 6 times the hose diameter into the water source.
DO NOT allow footvalve strainer to rest on bottom of lake or riverbed. Check strainer
frequently to make sure that it is not clogged with moss, leaves, etc.
DO NOT lift strainer from water while the pump is operating. Use a rope or other means to
keep strainer at proper height, approximately 1 foot (30 cm) below water surface. If
strainer is too close to the water surface, it will draw air and pump may lose prime.

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Priming the Pump
Before priming the pump, discharge hoses should be installed. Several options are
available to prime a pump when you are drafting water, depending on the priming
equipment you have.
Note: The priming line must be connected to a port on the pump that allows the eye of the
impeller to completely fill with water. A shut off valve should also be placed between the
pump and the primer to shut off the priming line once the pump has been primed.
WATERAX Hand Primer: If the unit is equipped with a hand primer, connect it to the
discharge port. Open the priming valve located below the discharge check valve and
pump until water is drawn into the pump and a solid stream of water flows from the
discharge port.
Manual Priming:
1. Open the priming cap and fill pump with water manually.
2. Firmly tighten priming cap.
3. Pump can also be primed by “jerking” the suction hose
until water flows from the pump’s discharge port.
Guzzler Priming:
1. Open the priming valve (located under the check valve
on portable units).
2. On vehicle mount units, ensure that the
discharge valves are closed.
3. Pump until water is drawn into the pump.
Electric Priming: See instructions for your
electric primer.
Note that most electric primer motors are
intended to be used only for a short duration
of time (about 20 seconds).
If pump fails to prime, see the
troubleshooting section.
Note: Close the priming valve after priming. Failure to close the priming valve could cause
the pump to lose prime or water to be pumped through the priming system.
Suction/
Intake Port
Discharge Port
Manual Prime: Attach
hand primer to discharge
port and pump until water
flows into pump-end.
Vehicle-mount
options(not shown):Use
electric primer or guzzler
primer, if equipped.

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Startup and Discharge
Discharge hoses should be installed before starting the engine and priming the pump.
1. Fill fuel tank with recommended fuel grade.
For models with an integral fuel tank, fill tank and securely replace cap.
2. Start the engine.
a. With all discharge valves closed, turn the on/off ignition key or switch to the “ON” position.
b. Open fuel valve.
c. Close/engage choke, if engine is cold.
d. Increase the throttle past the idle position.
e. Start the engine using the key switch or the start button. Hold until engine starts. DO NOT HOLD
for more than 5 seconds. If starting using the rewind starter, ensure that the key switch or ignition
switch is on the “ON” position. Give starter rope a quick and steady pull until engine starts.
f. Open/disengage choke
g. Allow engine to warm up for a minimum of 2 minutes before using full throttle.
Note: Leaving the pump running with all the discharge valves closed is called deadheading the
pump. The pump should not be left in this mode for more than a minute. Leaving in this
condition for any length of time will cause the pump to overheat and damage the pump.
To avoid overheating the pump, a re-circulation line (if provided) should be opened or a
discharge line left slightly open to allow fresh water to continue to enter the pump.
3. Discharge water.
Once the pump is primed, and with the engine running, you can begin to discharge water.
a. Slowly open the discharge valve. If pressure does not build in the discharge hose, the pump has
not been fully primed. The valve should be closed and the pump primed again.
b. Adjust the pump performance by throttling the engine up or down, or opening or closing discharge
valves at various positions, or any combination of the two.
Note: If the engine throttle is increased and the engine RPM increases without an increase in
pump pressure, the pump may be cavitating. Refer to the limitations listed at the
beginning of this section, and see the troubleshooting section for a verification checklist
and possible solutions.
Shutdown
1. After completing the pump operation, gradually reduce the engine RPM and slowly
close the discharge valves (preferably in the order listed).
2. Whenever the unit has been run at full throttle for most of the operation, allow the
valves to remain slightly open and run the engine at idle for approximately 5 minutes
before shutting down the unit.
3. If the pump was last run with foam or water that is salty, brackish or high in mineral
content, flush the pump with fresh water for a minimum of 2 minutes or until the water
is clear.
4. Close off the hydrant or water supply to the pump.
5. Open all valves to relieve any pressure left in the system.

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Cold Weather Operation
The pump can be run in below freezing temperatures if certain precautions are taken to
avoid the formation of ice in the pump.
1. After priming the pump, the unit should be run at low speed for a short period of time to
allow all components to warm up before continuing with the remaining operating
procedures.
2. Unless wrapped in a heater, drain the pump of all water if it is stopped for any length of
time. The engine/drive unit should be turned over a few revolutions to make sure all
water has been removed from the pump. Drain the pump priming line if a primer has
been used.
3. After use, drain the pump, manifolds, and lines of all water. You can also pour some
antifreeze into the pump and circulate it through the pump and plumbing system.
Basic Care and Storage
The basic care described in this section does not require any disassembly of the pump.
For any servicing procedures that require removing any part of the pump to access a
component, please see the Service section.
WARNING: Before doing any maintenance to the pump, always ensure that the
equipment cannot be accidentally started. Follow any apparatus and/or departmental
procedures or guidelines in regards to locking out the equipment.
Regular maintenance
After each use:
1. Visually inspect the pump unit.
2. Make sure the mechanical rotary seal is not leaking.
3. Check the pump for external leaks.
4. Check the engine for leaks.
5. Check the condition of the flexible buffer coupling. Replace if worn. See instructions for
removing the pump end from the engine using the quick release pump clamp.
6. Clean any dirt or debris from the pump unit. If necessary, a mild soap and water
solution can be used.
7. Note and report any performance irregularities or any abnormal mechanical sounds.
8. Check all fluid levels and add as needed.
9. Make sure all necessary tools, spares, and accessories are with the pump.
Long-term storage
1. Completely drain the pump of all water.
2. Drain the carburetor. The engine can be run with the fuel valve lever in the OFF
position to drain the system.
3. Drain the fuel tank.
4. Close all valves and plug all openings.
5. Follow any other products, components, apparatus, and departmental procedures
and/or guidelines before placing the unit in storage.

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Troubleshooting
This section provides brief troubleshooting instructions for verifying the set-up and
operation of the pump. Each section describes a condition and lists possible causes along
with a list of items to check to identify the source of the problem and resolve it.
Pump Loses Prime or Will Not Prime
Air Leaks
Attempt to locate and correct the air leaks by isolating each system component.
Disconnect the pump priming system and test. Check that the priming system is
pulling its rated vacuum.
Cap the pump discharge and prime the pump. If the pump primes, the leak is in
the pump discharge components. If the pump does not prime, the leak may be in
the pump, or the pump intake system.
Cap the pump intake and discharge and then perform a vacuum test on the
pump (15 to 30 in Hg). If the prime holds, then the leak is in the pump intake
components. If the pump does not hold prime, leakage could come from a port
or drain line attached to the pump.
Before repeating the test above, disconnect the drain line from the pump and
plug. If the pump holds vacuum, the leak is in the drain line or drain valve. If the
pump does not hold prime, leakage could be from another component attached
to a port in the pump.
Before repeating the test above one last time, remove any other component
connection from the pump and plug. Re-test the pump under vacuum. If the
pump holds prime, leakage was in one of the components removed. If the pump
does not hold prime, leakage is in the pump.
Air Trapped
in Suction
(Pump Intake)
Line
Check that no part of the suction hose or piping is higher than the pump intake.
Pump suction hose and piping must be laid out with a continuous decline to the
water source from the pump intake.
If the pump intake piping above the pump intake cannot be avoided, priming
taps must be added to the raised section of piping for the removal of trapped air.
If the suction hose cannot be laid out in a manner to avoid raised sections in the
hose, wiggle and raise the hose while priming to allow the entrapped air to work
its way from the raised region.
Check the priming port location. If the port is not located in a position that will
allow the eye of the impeller to fill with water, it will need to be moved to a
location that will do so.
Blocked or
Restricted
Intake Hose
or Strainer
Remove blockage from the intake hose or strainer.
Strainer should not be sitting at the bottom of the water source where debris can
be picked up. Clean off the strainer and raise to a position that is off the bottom
of the water source (floating strainers are available).
If the strainer is new, check that the strainer hole size is not too restrictive for the
demands of the pump.
Pump
Suction Lift
Requirements
are Too High
DO NOT attempt pump lifts exceeding 22 feet (6.7 meters) except at elevations
lower than 2000 feet above sea level.
As elevation increases above 2000 feet above sea level, maximum lift heights
will diminish. Check that the lift for the elevation the pump is being required to
operate at is achievable.
Inoperative
Priming
System
Check and service the priming system as outlined in the documentation from the
priming system’s supplier.

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14 09/2015
Pump Does Not Meet Performance
Incompatible
Installation
Piping size and configuration may be too restrictive. Contact a WATERAX Inc.
representative if assistance is needed in evaluating the unit’s piping.
Gauge or
Instrument
Failure
Check that all gauges are calibrated and that all equipment is in proper
condition. Nozzles with dented edges and bent or damaged pitot tubes will
produce faulty readings.
Blockage
Check all hoses, tank, piping, etc. Remove any obstructions found.
Check for debris wedged or caught in the impeller or diffusers. Remove any
obstructions found.
Insufficient
Power to the
Pump
Check engine compression and complete engine repairs if required.
An engine tune up may be needed to bring engine back to peak performance.
An engine will lose approximate 3.5% of its power per every 1000 feet above
sea level. If the elevation of operation was not considered when the unit was
selected, a unit of higher horsepower may be required to make the needed
performance.
Restriction
If a new strainer and/or intake hose was purchased, check that they provide
adequate supply to the pump to meet the performance desired.
If the pump was purchased used, check that the actual configuration will achieve
the desired performance. A WATERAX Inc. representative can be contacted for
assistance.
Check pump lift. Refer to “Pump Loses Prime or Will Not Prime: Suction Lift Too
High” section.
Pump Cavitating
Lift Too High
Move pump closer to water source.
Decrease pump’s intake hose length.
Increase pump’s intake hose size (inner diameter).
Water
Temperature
Water temperature may be too high. Water temperatures approaching 35°C
(95°F) or higher are likely to cavitate the pump. Decrease engine speed and/or
gate the discharge valve to decrease pump flow until the cavitating stops.
Locate a cooler water source.
Restrictions
Refer to “Restrictions” in the “Pump Does Not Make Performance” section.
Check that the bottom of the suction hose is at a minimum of 2 feet (0.6 meters)
from the bottom of the water source and correct if necessary.
Check that the bottom of the suction hose/strainer is 4 to 6 times the hose
diameter below the water supply surface level and correct if necessary.
Engine Speed Too High for Required Capacity and Pressure
Air Leaks
Refer to “Pump Loses or Will Not Prime: Air Leak” section.

WATERAX STRIKER-2/3 Owner's Manual
09/2015 15
ID
ITEM NO
DESCRIPTION
QTY
1
600101
C-7221 SPEED INCREASER HOUSING,
ALU. PAINTED
1
2
800512
FAST-502 LOCKWASHER 3/8 SPLIT ZINC
8
3
800524
FAST-23 SCREW 3/8-16X1-1/4 HEX CAP
ZINC
4
4
800803
PART-1 TIMING BELT,8MMP X 30W X
720LG
1
5
800825
PART-2 PULLEY 64T X 8MM P X 30MM W
1
6
801011
PART-4 BUSHING FOR 1" SHAFT
1
7
600176
PART-7 KEY 1/4"SQUARE, S.S.
1
8
800513
FAST-501 LOCKWASHER 5/16 SPLIT
ZINC
6
9
800534
FAST-1 SCREW 5/16-18X3 HEX CAP ZINC
DICHROMATE
6
10
800856
PART-3 PULLEY 34T X 8MM P X 30MM W
1
11
800852
PART-5 BUSHING FOR 3/4" SHAFT
1
12
600151
PART-6 KEY 3/16" SQUARE, S.S.
1
13
600124
B-7544 DRIVE CARRIER ASSEMBLY
COMPLETE
1
14
800527
FAST-2 SCREW 3/8-16X1 HEX CAP ZINC
DICHROMATE
4
15
600063
212-170P CLAMP ASSEMBLY, ALU.
PAINTED
1
Service
This section includes instructions for overhaul and maintenance requiring disassembly of
the WATERAX 2/3-stage pump end models 25-16S/18-16S that is integrated in the
STRIKER-2/3 series pumps. It does not include engine maintenance. For maintenance
instructions regarding the engine, as well as for oil and fuel recommendations, please
refer to the engine manufacturer’s manual.
Note: It is recommended that all fasteners be replaced with genuine WATERAX parts.
Drive Assembly Parts Breakdown
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15
Figure 1: Exploded view of drive assembly

WATERAX STRIKER-2/3 Owner's Manual
16 09/2015
ID
ITEM NO
DESCRIPTION
QTY
1
800538
PART-8 RETAINING RING EXT.
1
2
800541
PART-9 RING RETAINING INT.
1
3
800836
PART-10 BEARING, 4 POINT
CONTACT, SEALED
2
4
700083
A-6956 SPACER FOR C-7220, ALU.
1
5
700086
A-7239 SHAFT ASSEMBLY FOR C-
7220
1
6
600130
C-6955 FLANGE FOR DRIVE HUB
ONLY, ALU.
1
1 2 3 4 5 6
DRAIN HOLE TO BE
FACING DOWN
Figure 2: Exploded view of drive hub assembly (item no 600124)
Installing the Drive Assembly
Before Installation
Read and follow all instructions thoroughly and carefully.
Ensure shaft, bores, screws, etc. are free of burrs and lubricant.
Tools and Materials Required
Torque wrench
SAE Socket wrench with the following sockets to be used on the drive box cap screws
and bushing cap screws:
7/16”
1/2"
9/16”
SAE Allen keys to be used on the bushing set screws:
1/8” or 3/32”
5/32”
Medium-strength threadlocker solution (e.g. Loctite® 243)

WATERAX STRIKER-2/3 Owner's Manual
09/2015 17
Procedure
1. Place the rear cover on engine. Make sure
the rear cover is properly positioned and
lying flat against the engine face. Securely
tighten the four cap screws and lock
washers.
If the drive assembly is installed
horizontally (see Fig. 2), start by installing
the transfer plate on the rear cover. Then
install the transfer plate with the rear cover
on the engine by securely tightening the
four cap hex socket head cap screws and
lock washers.
Important: The drive hub assembly has a
drain hole. Ensure that the drain hole is
facing down.
2. Measure and make note of the driver
pulley’s width (W) and distance between
driven pulley (small) and the front cover
mating face (DF). These dimensions will be
used later on to properly position the driver
pulley (large) and ensure proper alignment.
W
DF
3. Align the non-threaded holes of the bushing
to the threaded holes of the driver pulley.
Insert the cap screws into the threaded
holes of the pulley and turn them by hand
three to four turns.
4. Put the bushing and driver pulley on the
shaft and align the keyways.
IMPORTANT: Make sure the engine shaft
is long enough to safely accommodate the
bushing and pulley. The bushing should not
protrude more than 3/8” from the end of the
engine drive shaft.
5. Insert the key. Make sure key runs the
entire length of the bushing bore.
6. Apply medium-strength threadlocker such
as Loctite®243 on the set screw. Install
and hand tighten only.
7. Using a torque wrench and the appropriate
socket, tighten the cap screws with lock
washers sequentially until each is tightened
to 180 in-lbs. When the cap screw is at the
recommended torque value, make at least
two more sequential rounds to ensure all
cap screws are at the adequate torque
value.
Partially
thread screws
Insert key
Insert set
screw

WATERAX STRIKER-2/3 Owner's Manual
18 09/2015
8. Since tightening the cap screws will affect
the axial position of the pulley, make sure
pulleys are properly aligned:
DR= W - DF
If adjustment is required, determine the
new position of the bushing and reposition
the pulley assembly. See page 19 for the
Removal of Pulley Assembly procedure.
9. Loop the timing belt around the large driver
pulley.
IMPORTANT: The torque value for the
driven pulley (small) cap screws is
108 in-lbs, not 180 in-lbs.
DR
10. To install the front cover, loop the timing
belt around the small driven pulley. Make
sure the timing belt is seated properly on
the pulleys.
11. Align the top dowel pin with the
corresponding hole on the front cover, and
partially insert the front cover onto the
dowel pin.
12. Using the top dowel pin as a pivot point,
swing the front cover and align the second
dowel pin with the corresponding hole.
13. Insert the front cover fully onto the dowel
pins and flat against the back cover mating
surface.
14. Fasten the front cover and the rear cover
using the six cap screws and lock washers.
To help seat the cover properly, tighten the
top screw, then the bottom screw, and then
alternate the screws on either side,
crisscrossing the cover. Securely tighten.
Align pivot
dowel and hole
in cover
Swing cover
into place
Secure cover
using cap
screws and
washers
15. Make sure the pulley assembly turns
smoothly by tugging on the recoil starter or
turning over the engine a couple of times
with the electric start.
Make sure you take all safety
precautions specified for your
engine.