www.mkdiamond.com
Gas Powered
Concrete Saw
CX-3
®
OWNER’S MANUAL &
OPERATING INSTRUCTIONS
Revision 105
Manual Part# 159345
Caution: Read all safety and operating instructions
before using this equipment. This owner’s manual
MUST accompany the equipment at all times.
07.2012
INTRODUCTION
Congratulations on your purchase of a CX-3® Concrete Saw. We are certain that you will be pleased
with your purchase. MK Diamond takes pride in producing the nest construction power tools and
diamond blades in the industry.
Operated correctly, your CX-3® Concrete Saw should provide you with years of service. In order to
help you, we have included this manual. This owners manual contains information necessary to operate and maintain your CX-3
®
yourself with the CX-3
Concrete Saw by reading and reviewing this manual.
Read and follow all safety, operating and maintenance instructions.
®
Concrete Saw safely and correctly. Please take the time to familiarize
If you should have questions concerning your CX-3
ly customer service department at: 800 421-5830
Regards,
MK Diamond
NOTE THIS INFORMATION FOR FUTURE USE:
MODEL NUMBER:
SERIAL NUMBER:
PURCHASE PLACE:
PURCHASE DATE:
NOTE: For your (1) one year warranty to be effective, complete the warranty card
(including the Serial Number) and mail it in as soon as possible.
®
Concrete Saw, please feel free to call our friend-
2
TABLE OF CONTENTS
SAFETY
Safety Messages 4
Damage Prevention Message 4
General Safety Precautions and Hazard Symbols 5
California Proposition 65 Message 8
Prestart Safety 9
Safety Label Locations 10
Product Specications 11
UNPACKING, TRANSPORT and ASSEMBLY
Unpacking 12
Contents 12
Transport 13
Assembly 14-15
STARTUP, OPERATION and SHUTDOWN
Startup 16-17
Operation 18
Shutdown 19
Cleanup 20
MAINTENANCE AND TROUBLESHOOTING
Maintenance 21-31
THEORY
Theory Of Diamond Blades 32
ACCESSORIES ORDERING and RETURN INSTRUCTIONS
Accessories 33
Ordering Information 34
Return Material Policy 34
Packaging Instructions 34
Authorized Service Centers 34
Warranty 35
3
CX-3® SAFETY
Safety precautions should be followed at all times when operating this equipment. Failure to read and
understand the Safety Precaution and Operating Instructions could result in injury to yourself and
others.
This Operation Manual has been developed to provide complete instructions for the safe and efcient
operation of the CX-3® Concrete Saw.
Before using this saw, ensure that the person operating the equipment has read and understands all
instructions in this manual.
SAFETY MESSAGE / ALERT SYMBOLS
A safety message alerts you to potential hazards that could hurt you or others. Each safety message is
preceded by a safety alert symbol ( ) and one of three words: DANGER, WARNING, or CAUTION.
DANGER
You WILL be KILLED or SERIOUSLY INJURED if you do not follow directions.
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. It may also be used
to alert against unsafe practices.
Each message tells you what the hazard is, what can happen, and what you can do to avoid or
reduce injury. Other important messages are preceded by the word NOTICE.
NOTICE
You can cause PROPERTY DAMAGE to your machine if you don’t follow directions.
The safety labels should be periodically inspected and cleaned by the user to maintain good legibility
at a safe viewing distance. If the label is worn, damaged or illegible, it should be replaced. Contact
MK Diamond or your dealer for replacement.
DAMAGE PREVENTION AND INFORMATION MESSAGES
A Damage Prevention Message is to inform the user of important information and/or instructions that
could lead to equipment or other property damage if not followed. Information messages convey
information that pertains to the equipment being used. Each message will be preceded by the word
note, as in the example below.
NOTE: Equipment and/or property damage may result if these instructions are not followed.
4
(
(
)
)
CX-3® SAFETY
GENERAL SAFETY PRECAUTIONS AND HAZARD SYMBOLS
SAFETY PRECAUTIONS
In order to prevent injury, the following safety precautions and symbols should be followed
at all times!
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 when not feeling well due to fatigue, illness or taking
medicine.
NEVER operate this equipment under the inuence of drugs or alcohol.
Whenever necessary, replace nameplate, operation and safety decals when they become
difcult to read.
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.
KEEP GUARDS IN PLACE
In order to prevent injury, keep guards in place and in working order at all times.
EXPLOSIVE FUEL!
Gasoline is extremely ammable, its vapors can explode if ignited; store only in approved
containers, in well-ventilated, unoccupied buildings and away from sparks or ames. Do not
ll the fuel tank while the engine is running or hot. Spilled fuel could ignite if it contacts hot
parts or sparks from ignition. Do not start the engine near spilled fuel. Never use gasoline
as a cleaning agent. Never operate the machine in an explosive atmosphere.
LETHAL EXHAUST GASES
Engine exhaust gasses contain poisonous carbon monoxide, an odorless colorless gas
that can cause death if inhaled. Avoid inhaling exhaust fumes, and never run the engine
in a closed building or conned area.
ENGINE OVER-SPEED
Never tamper with the governor components or settings to increase the maximum speed of
the machine. Severe personal injury and/or equipment damage could result if the equip-
ment is operated speeds above design maximum.
5
CX-3® SAFETY
on
ACCIDENTAL STARTS
Before starting the engine, be sure the ON/OFF switch is in the “OFF” position to prevent
accidental starting. Place the ON/OFF switch in the OFF position before performing any
service operation.
ROTATING OR MOVING PARTS
Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never
operate a power tool with shrouds or guards removed.
HOT PARTS
Engine components can become extremely hot from operation. To prevent severe burns, do
not touch these areas while the engine is running, or immediately after it is turned off. Never
operate the engine with heat shields removed.
ALWAYS USE SAFETY GLASSES
Safety glasses should always be worn when working around power tools. Everyday eyeglasses only have impact resistant lenses and may not prevent eye injury; they are NOT
safety glasses.
ALWAYS USE RESPIRATORY PROTECTION
Exhaust gases may be harmful if inhaled. Do not operate gas-powered equipment in
enclosed spaces. Respiratory protection should be worn when operating gas powered
equipment.
ALWAYS USE HEARING PROTECTION
To reduce the possibility of hearing loss, always use hearing protection when operating
equipment.
REMOVE ADJUSTING KEYS AND WRENCHES
Form a habit of checking to see that keys and adjusting wrenches are removed from the power tool
before it is turned on.
KEEP WORK AREA CLEAN
Cluttered work areas and benches invite accidents.
DO NOT USE IN DANGEROUS ENVIRONMENTS
Do not operate equipment in dangerous environments. Always keep the work area well lighted.
KEEP CHILDREN AWAY
All visitors and children should be kept a safe distance from work area.
MAKE WORKSHOP KID PROOF
Make the workshops kid proof by using padlocks, master switches or by removing starter keys.
6
CX-3® SAFETY
DO NOT FORCE THE TOOL
A power tool will do a job better and safer operating at the rate for which it was designed.
USE THE RIGHT TOOL
Do not force a tool or an attachment, to do a job that it was not designed to do.
WEAR PROPER APPAREL
Do not wear loose clothing, gloves, neckties, rings, bracelets, or other jewelry that may be caught in
moving parts. Nonslip footwear is recommended. Wear protective hair covering to contain long hair.
SECURE WORK
Clamps or a vise should be used to hold work whenever practical. Keeping your hands free to oper-
ate a power tool is safer.
DO NOT OVERREACH
Keep proper footing and balance at all times by not overreaching.
MAINTAIN TOOLS WITH CARE
Keep tools sharp and clean for the best and safest performance. Always follow maintenance instruc-
tions for lubricating and when changing accessories.
SHUTDOWN TOOL
The saw should always be shutdown before servicing or when changing accessories such as blades,
bits, cutters, etc...
USE RECOMMENDED ACCESSORIES
Consult the owner’s manual for recommended accessories. Using improper accessories may increase the risk of personal or by-stander injury.
NEVER STAND ON THE TOOL
Serious injury could occur if a power tool is tipped, or if a cutting tool is unintentionally contacted.
NEVER LEAVE TOOL RUNNING UNATTENDED – TURN POWER OFF
Do not leave a tool until it comes to a complete stop. Always turn a power tool OFF when leaving the
work area, or, when a cut is nished.
CHECK FOR DAMAGED PARTS
Before using a power tool, check for damaged parts. A guard or any other part that is damaged
should be carefully checked to determine it would operate properly and perform its intended function. Always check moving parts for proper alignment or binding. Check for broken parts, mountings
and all other conditions that may affect the operation of the power tool. A guard or any damaged part
should be properly repaired or replaced.
DIRECTION OF FEED
Always feed work into a blade or cutter against the direction of rotation. A blade or cutter should al-
ways be installed such that rotation is in the direction of the arrow imprinted on the side of the blade
or cutter.
7
CX-3® SAFETY
SILICA DUST WARNING
Grinding/cutting/drilling of masonry, concrete, metal and other materials with silica in their composition
may give off dust or mists containing crystalline silica. Silica is a basic component of sand, quartz,
brick clay, granite and numerous other minerals and rocks. Repeated and/or substantial inhalation of
airborne crystalline silica can cause serious or fatal respiratory diseases, including silicosis. In addition, California and some other authorities have listed respirable crystalline silica as a substance
known to cause cancer. When cutting such materials, always follow respiratory precautions.
Use appropriate NIOSH-approved respiratory protection where dust hazard may occur. Paper masks
or surgical masks without a NIOSH approval number are not recommended because they do little to
protect the worker. For more information about respirator programs, including what respirators have
received NIOSH approval as safe and effective, please visit the NIOSH website at:
http://www.cdc.gov/niosh/npptl/topics/respirators
Observe OSHA regulations for respirator use (29 C.F.R.§1910.134 and §1503.1).
Visit http://www.osha.gov for more information.
CALIFORNIA PROPOSITION 65 MESSAGE
Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contain chemicals known (to the State of California) to cause cancer, birth defects or other reproductive
harm. Some examples of these chemicals are:
• Lead, from lead-based paints
• Crystalline silica, from bricks and cement and other masonry products
• Arsenic and chromium, from chemically treated lumber
For further information, consult the following sources:
http://www.osha.gov/dsg/topics/silicacrystalline/index.html
http://www.cdc.gov/niosh/consilic.html
http://oehha.ca.gov/prop65/law/P65law72003.html
http://www.dir.ca.gov/Title8/sub4.html
Your risk from these exposures varies depending on how often you do this type of work. To reduce
your exposure to these chemicals, work in a well-ventilated area, and work with approved safety
equipment, such as those dust masks that are specially designed to lter out microscopic particles.
8
CX-3® PRE-START
Before starting the machine, ALWAYS check that all guards are in position and correctly tted. Check
the machine for loose bolts before starting.
Keep area around the machine clear of obstructions which could cause persons to fall onto moving parts.
ALWAYS ensure that the machine is on level ground before using. Know how to stop the machine
quickly in case of emergency. NEVER try to stop a moving blade with your hands.
• NEVER disconnect any “emergency or safety devices”. These devices are intended for
operator safety. Disconnection of these devices can cause severe injury, bodily harm or
even death! Disconnection of any of these devices will void all warranties.
• Unauthorized equipment modications will void all warranties. Manufacturer does not
assume responsibility for any accident due to equipment modications.
• NEVER use accessories or attachments, which are not recommended by MK Diamond for
this equipment. Damage to the equipment and/or injury to user may result.
WARNING
DO NOT use woodcutting, or carbide blades on this machine! Use ONLY Diamond blades on
machine. Use machine only to cut concrete and asphalt. DO NOT use machine to cut wood or
wood products.
WARNING
Diamond Blades improperly used are dangerous. Comply with American National Standards Institute
Safety Code, B7.1 and, Occupational Safety and Health Act covering Speed, Safety Guards, Flanges,
Mounting Procedures, General Operating Rules, Handling, Storage and General Machine Conditions.
WARNING
Exhaust gas from gasoline engines contain dangerous carbon monoxide. Breathing it can cause
unconsciousness and even kill you. Always operate gasoline engine machines in a well-ventilated
area DO NOT operate in areas where exhaust fumes could accumulate without wearing appropriate
respiratory protection.
NOTE:
The operator must be aware of the machine’s capabilities and limitations. It is
the operators responsibility to use this machine under safe working conditions
and conform with federal, state and local codes or regulations pertaining to
safety, air, pollution, noise etc...
Prior to operation of this machine the operator must determine the existence
and location of any subsurface features that may be hazardous or could dam-
age the equipment, (i.e. electric cable, natural gas line etc.)
9
CX-3® SAFETY
OPERATION & SAFETY DECALS
The CX-3® Concrete Saw is equipped with a number of safety decals. These decals are provided for
operator safety and maintenance information. Should any of these operation or safety decals become
unreadable, replacements can be obtained by calling (800) 262-1575.
DANGER
WARNING
!
H
(A)
G
F
(B)
E
(C)
(D)
The exhaust from this product
(E)
contains chemicals known to
the State of California to cause
cancer, birth defects or other
reproductive harm.
DO NOT operate
this equipment
before reading
the owners’
manual!
!
WARNING
Grinding/cutting/drilling of masonry, concrete, metal and other materials with silica in
their composition may give off dust or mists containing crystalline silica. Silica is a basic
component of sand, quartz, brick clay, granite and numerous other minerals and rocks.
Repeated and/or substantial inhalation of airborne crystalline silica can cause serious
or fatal respiratory diseases, including silicosis. In addition, California and some other
authorities have listed respirable crystalline silica as a substance known to cause cancer.
CAUTION
!
DO NOT
operate without
guards in place.
(3 of them)
WARNING
!
In the event of
blade failure,
replace blade
guard
immediately.
DANGER
!
D
C
Concrete Saw Warning Label Sheet Part# 166009
Lethal exhaust
gases. Use only
in well ventilated
areas. DO NOT
use indoors.
WARNING
!
When refueling
stop engine and
allow to cool.
DO NOT overfill
tank.
CAUTION
!
DO NOT
touch hot
surface.
CAUTION
!
Accidental start hazard.
Disconnect spark plug
prior to servicing.
FOR INFORMATION ON
SERVICE OR
WARRANTY
PLEASE CALL
1-800-474-5594
CAUTION
!
Keep
hands and
feet clear.
(F)
(G)
(H)
(I)
(J)
(K)
!
WARNING
Handle bar NOT a lifting point.
NOTICE
!
Overtensioning of belts
will result in premature
crank and/or bearing failure.
Read entire operatorʼs manual before operating this
machine. Understand all warnings, instructions and
controls. IF YOU DO NOT HAVE AN OPERATORʼS
MANUAL, CALL TOLL FREE 1-800-474-5594
Machinery Hazard - Always keep all guards in place
and in good condition. Always keep all parts of your
body away from blade and all other moving parts.
Never allow blade exposure to exceed 180°.
Always use blades with a rated speed above the
blade shaft speed. Excessive speed can cause blade
breakage. Verify speed by checking blade shaft RPM,
pulley diameters and blade flange diameter.
WARNING
Always wear safety approved hearing,
eye, head and respiratory protection
(L)
(M)
Never use damaged
blades or equipment.
Never operate this machine
in areas of combustible material.
Some dust created by power sanding, sawing,
grinding, drilling, and other construction activities
contains chemicals known (to the State of California)
to cause cancer, birth defects or other reproductive
harm. Some examples of these chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and
cement and other masonry products
• Arsenic and chromium
from chemically-treated lumber
(N)
J
A
N
I
K
M
C
L
B
Location Description
A
Motor Plate Read Manual
B
Arm Proposition 65, Dust Warning
C
Shaft Cover & Belt Guard Guards in Place
D
Blade Guard Replace Blade Guard
E
Gas Tank/Side Exhaust/Cancer
F
Gas Tank/Top Lethal Exhaust
G
Gas Tank/Top Refueling
H
Gas Tank/Top Belt Guard Hot Surface
I
Gas Tank/Side Accidental Start
J
Frame/Back Service
K
Frame/Front Hand & Feet Clear
L
Handle Lifting Point
M
Belt Guard Overtensioning Belts
N
Console Machinery Hazard
10
CX-3® PRODUCT SPECIFICATION
PRODUCT SPECIFICATIONS
®
The CX-3
the CX-3
General Description
The CX-3® is engineered as a portable concrete saw powered by a Subaru, Honda or Kohler gas
engine. The saw is capable of cutting up to ve and half (5-1/2) inches in depth.
MotorandWeightSpecications
Motor and Weight specications for the CX-3
is a versatile gas powered Concrete Saw. Operated and used according to this manual,
®
will provide years of dependable service.
®
are listed below.
Motor Type 4-Stroke, Overhead valve, single cylinder
Max RPM 3600 RPM
Blade Speed 3400 to 3600 RPM (Depending on Blade Diameter)
Fuel Tank Capacity
See Engine Manual for details
Engine Oil Capacity
Weight Approximately 116 lbs.
Blade
®
The CX-3
uses a 12 to 14 inch diameter diamond blade.
Concrete Saw Usage
®
The CX-3
is designed to cut various grades of concrete surfaces.
Features
• Compact, lightweight, engineered for maneuverability and reliability
• Can be used for wet or dry cutting
• Corrosion resistant cast-aluminum blade guard
• Built-in water distribution system supplies water to both sides of blade
• Blade guard mounts on either left- or right-hand side of saw and cuts within 1” of wall or curb
• Sturdy single piece steel motor mount weldment to minimize vibration
• 1” diameter blade shaft with self aligning bearings
• Hinged blade guard provides easy access for blade changes and inspection
• Folding handle bar for compact transport
• Poly V-belt for positive power transmission
11
CX-3® UNPACKING
UNPACKING
Your CX-3® has been shipped from the factory thoroughly inspected. Only minimal assembly is
required.
Remove the CX-3® from the pallet and place it on a at surface.
CONTENTS
®
In the containers, you will nd one (1) CX-3
(2) Handlebar Tri-Knobs, two (2) Tri-Knob Washers, one (1) CX-3
Owners Manual, one (1) Warranty Card, one (1) Handle, and one (1) Pointer.
, two (2) Blade Shaft Wrenches, one (1) Handlebar, two
®
Owner’s Manual, one (1) Engine
®
CX-3
www.mkdiamond.com
Gas Powered
Concrete Saw
12.2010
Revision 100
Manual Part# 159345
Caution: Read all safety and operating instructions
before using this equipment. This owner’s manual
MUST accompany the equipment at all times.
CX-3
OWNER’S MANUAL &
OPERATING INSTRUCTIONS
®
®
CX-3
Owner’s Manual
2 Blade Shaft
Handlebar
Wrenches
Engine Manual Warranty
Card
Handlebar
Tri-Knob
Handle
Tri-Knob
Washer
Pointer
12
CX-3® TRANSPORT
TRANSPORT
CAUTION
1. The CX-3® weighs approximately one hundred and sixteen (116 pounds),
use care when transporting.
2. Two people are required to lift and transport the CX-3®.
®
To lift the CX-3
, one person will lift by grasping the Handlebar (either extended or folded) and one
person will lift by grasping the front of the CX-3
®
.
Follow the assembly instructions to prepare your CX-3® for operation.
Handlebar Assembly
(A)
Locate the threaded holes on
both sides of CX-3
®
console
frame.
Align the handlebar with the
threaded holes on the sides of
the CX-3® console frame.
(B)
13
(C)
Install one Tri-Knob Washer onto
each Tri-Knob. Install Tri-Knobs
through the Handlebar and into the
threaded holes on the CX-3
®
console frame.
CX-3® ASSEMBLY
Diamond Blade Installation
NOTE:
When installing the diamond blade retaining-bolt, ensure the threads of the bolt are aligned
with the threads of the drive shaft so as not to “cross-thread” the bolt.
(A)
Locate Blade Guard lock.
(B)
Push Lock Button. Open the
Blade Guard cover.
(C)
Locate the Blade Retaining Bolt
and the Outer Flange.
(D)
Loosen the Blade Retaining Bolt
while holding the Shaft Wrench
steady. Remove the Blade Retain-
ing Screw and Outer Flange.
(G)
Install the Blade Retaining Bolt.
(E)
Install the Diamond Blade onto
the Blade Shaft. Ensure arrow is
pointed in direction of rotation.
(H)
Tighten Blade Retaining
Bolt while holding the Blade
Shaft steady.
Install the Outer Flange. Verify
it is seated against the blade.
(F)
WARNING
Diamond Blades improperly used are dangerous. Comply with American National Standards Institute
Safety Code, B7.1 and, Occupational Safety and Health Act covering Speed, Safety Guards, Flanges,
Mounting Procedures, General Operating Rules, Handling, Storage and General Machine Conditions.
14
CX-3® ASSEMBLY
Filling Oil Reservoir
(A)
Verify the Oil Drain Cap is
installed onto the Oil Drain Line
and is tight. Refer to Engine
Manual for details.
Crank Wheel Handle Installation
NOTE:
The engine is shipped with no oil in the crankcase.
Refer to Engine Manual for details on type and
amount of oil required.
(A)
Insert Crank Wheel Handle
mounting bolt up through hole in
crank wheel.
Pointer Installation
NOTE:
(A)
Insert bolt on Pointer into mount-
ing ange next to Blade Guard.
Limiting bracket properly installed will prevent pointer from contacting engine when
in the up position
(B)
Thread Crank Wheel Handle
onto bolt.
(B)
Install limiting bracket onto bolt
as shown.
(C)
Hold crank wheel handle and
tighten bolt with Allen wrench.
(C)
Thread locking nut on to bolt
and tighten.
15
CX-3® START UP
Filling Fuel Tank
WARNING
NOTE:
1. Gasoline is highly ammable and explosive. You can be burned or seriously
injured when handling fuel.
2. To fuel, stop engine if running, and allow it to cool.
3. Refuel in a well-ventilated area.
4. Keep gasoline away from appliance pilot lights, barbeques, electric appliances,
power tools, etc.
5. Wipe up spills immediately.
1. Fuel can damage paint and plastic. Be careful not to spill fuel when lling the
fuel tank. Damage caused by spilled fuel IS NOT covered under the warranty.
2. DO NOT use stale or contaminated gasoline, or an oil/gasoline mixture.
1 inch (25mm)
from throat
Maximum
Fuel Level
Maximum
Fuel Level
(A)
Remove the Fuel Cap. Refer to
Engine Manual for details.
Ensure fuel level is 1” below the
throat of the Fuel Tank.
(B)
(C)
Ensure fuel level is below the
top of the strainer lter.
Pre-Start Inspection
The pre-start inspection should be performed before beginning any job. If Diamond Blade is worn,
replace the blade before starting work.
(A)
Inspect Blade for damage for
cracks Verify the Blade is correct
for the material being cut.
(B)
Inspect Engine for leaks.
Inspect the CX-3
damage and/or loose hardware.
(C)
®
for general
16
CX-3® STARTUP
Proper Oil Level
Low Level
(D)
Check for proper oil level.
Refer to Engine Manual for
details.
1 inch (25mm)
from throat
Maximum
Fuel Level
(E)
Ensure fuel level is 1” below the
throat of the Fuel Tank.
Maximum
Fuel Level
(F)
Ensure fuel level is below the
top of the strainer lter.
(G)
Check the Air Filter for
cleanliness. Refer to Engine
Manual for details.
Engine Start
WARNING
1. Carbon monoxide gas is toxic, breathing it can cause unconsciousness
and/or death.
2. Avoid any areas or actions that expose you to carbon monoxide.
(A)
Use the Depth Control Wheel to
raise the Blade clear of the oor.
Refer to Engine Manual for start-
ing procedure.
17
CX-3® OPERATION
Standard Operation
The following is a brief overview of operating the CX-3®.
(A)
Use the depth control wheel to
raise the blade clear of the oor.
(D)
Tighten thumbscrew.
(B)
Attach the cooling supply
hose to the Cooling Inlet.
(E)
Layout and mark the area to
be cut using a chalk-line. Align
Pointer and Blade to chalk-line.
(C)
Lower the Pointer. Align a straight-
edge with a blade. Loosen thumbscrew on front of Pointer to adjust
guide wheel, align with straightedge.
(F)
Start the CX-3® using the Engine
Start procedure in the Engine
Manual.
(G)
With the engine running adjust
the throttle approximately half-
way.
(H)
Open Cooling Supply Valve. Verify proper cooling ow and adjust
the water ow on the Blade to a
desired amount.
18
(I)
Adjust the throttle as needed to
make the cut. Slowly lower the
Blade until the desired level is
reached and begin the cut.
CX-3® SHUTDOWN
(J)
When the cut is complete, raise the
Blade. Close Cooling Supply Valve
and shut down saw.
Normal Engine Shutdown
NOTE:
Perform the cut using only enough pressure to follow the
original marked line. The saw has a natural tendency to
pull towards the side on which the blade is mounted. To
assure straight line cutting, apply pressure to the appropriate handle. If excessive pressure is required back off the
on the forward speed of the saw. Driving the saw too fast
while cutting may cause the front wheels to lift causing the
blade to cut at uneven depths. Do not attempt to steer the
saw. Sudden and severe corrections can cause the blade
to be damaged or broken.
(A)
Raise the Blade the ground.
(D)
Raise the Pointer.
(B)
Move the Throttle Lever to lower
blade speed.
19
(C)
Place Engine Master Switch in
the OFF position. Place Fuel
Valve in the OFF position.
Refer to Engine Manual.
CX-3® CLEANUP
Emergency Engine Shutdown
(A)
Place Engine Master Switch in
the OFF position.
Cleanup
CAUTION
Engine parts are extremely hot following use, allow engine to cool 1/2-hour
before cleaning. Use care during cleanup to avoid injury.
NOTE:
1. To extend operating life, the Concrete Saw should be cleaned following every
use.
2. Using a garden hose or pressure washer is not advised as it can force water
into the air cleaner or mufer opening.
3. Use care when cleaning around electrical components.
(B)
Move the Throttle Lever to lower
blade speed. Place Fuel Valve in
the OFF position.
(A)
Verify the engine is off and cool
before beginning to clean. Clean
the CX-3
Clean water system outlets, includ-
ing water tubes in blade guard.
®
with soap and water.
(D)
(B)
Clean around the Console.
(E)
Clean the remainder of the exte-
rior surface (except the engine).
20
(C)
Clean the Depth Control Screw.
CX-3® MAINTENANCE
MAINTENANCE SAFETY
• NEVER lubricate components or attempt service on a running machine.
• Keep the machinery in proper running condition.
• Fix damage to the machine immediately and always replace broken parts, or missing decals.
New Maintenance
Perform the following after initial purchase and operation of the saw.
(A)
Change engine oil after
rst month or rst 20 operating
hours (See Engine Manual).
Check and adjust tension on
all belts following rst
48 hours of operation
(See belt section).
(B)
Maintenance Following Use
The following maintenance should be performed following each use.
(A)
Shut down the Engine.
(See Engine Manual).
(B)
Check Air Filter
(C)
Lubricate the Grease Fitting.
(D)
Lubricate the pivot point of the
Pointer.
(E)
Lubricate the Cooling
Supply Valve.
21
(F)
Verify the tightness of all bolts
and screws.
CX-3® MAINTENANCE
Weekly (50 hours) and Monthly (200 hours)
The following should be performed monthly. Items should be lubricated using waterproof grease.
(A)
Change engine oil every 100
hours. Refer to Engine Manual
for details.
(D)
Clean engine Air Filter weekly
and replace monthly. Refer to
Engine Manual for details.
(B)
Lubricate the Depth Control
Screw (Monthly).
(E)
Clean Spark Plug Weekly and
readjust Spark Plug monthly.
Refer to Engine Manual for
details.
(C)
Lubricate the Blade Shaft Bear-
ings (Monthly).
(F)
Clean and lubricate the Blade
Shaft.
(G)
Clean and lubricate the Blade
Retaining Bolt.
22
CX-3® MAINTENANCE
500 Hours and 1000 Hour Maintenance
Perform the following maintenance every 500 hours.
(A)
Replace Spark Plug. Refer to
Engine Manual for details.
Have Authorized Repair Shop
perform 500-hour
maintenance.
Yearly and Two-Year Maintenance
Perform the following maintenance every year.
(A)
Inspect belts for proper tension
and wear.
(B)
(C)
Have Authorized Repair Shop
perform 1000-hour maintenance.
23
CX-3® MAINTENANCE
Check Fuel Level
For all Engine related maintenance and troubleshooting refer to the Engine Manual.
WARNING
NOTE:
1. Gasoline is highly ammable and explosive. You can be burned or seriously
injured when handling fuel.
2. To fuel, stop engine if running and allow it to cool.
3. Refuel in a well-ventilated area.
4. Keep gasoline away from appliance pilot lights, barbeques, electric appliances,
power tools, etc.
5. Wipe up spills immediately.
1. Fuel can damage paint and plastic. Be careful not to spill fuel when lling the
fuel tank. Damage caused by spilled fuel IS NOT covered under the warranty.
2. DO NOT use stale or contaminated gasoline or an oil/gasoline mixture.
1 inch (25mm)
from throat
Maximum
Fuel Level
Maximum
Fuel Level
(A)
Remove the Fuel Cap. Refer to
Engine Manual for details.
Checking Oil Level
When installing the Oil Dipstick, ensure the threads are aligned with the threads of
NOTE:
Verify the Engine is upright and
level. Refer to Engine Manual
the Oil Reservoir so as not to “cross-thread.”
(A)
for details.
(B)
Ensure fuel level is 1” below the
throat of the Fuel Tank.
(C)
Ensure fuel level is below the
top of the strainer lter.
24
CX-3® MAINTENANCE
Changing Oil
For all Engine related maintenance and troubleshooting refer to the Engine Manual.
Oil is a major factor affecting performance and service life.
NOTE:
1. Drain used oil when the engine is warm.
2. Conform to Federal, State, and Local laws, codes and ordinances relative to
environmental protection for oil disposal.
(A)
Remove the Diamond Blade.
See Blade removal section.
Lower the CX-3
(B)
®
to its lowest
position.
Engine Air Filter Inspection Cleaning and Replacement
(C)
Free the Oil Drain Line.
Place a catch basin below the
Oil Drain Line. Remove the Drain
Cap to drain oil completely. Refer
to Engine Manual for details.
(A)
Clean the Air Filter. Refer to
Engine Manual for details.
25
CX-3® MAINTENANCE
Diamond Blade Removal
(A)
Locate Blade Guard lock.
(D)
Remove blade.
(B)
Push Lock Button. Open the
Blade Guard Cover.
(E)
Install the new Blade, Retaining
Bolt and Outer Flange.
(C)
Remove the Blade Retaining Bolt
and the Outer Flange.
(F)
Tighten Blade Retaining Bolt
while holding the Blade Shaft
steady.
26
CX-3® MAINTENANCE
Spark Plug Adjustments and Replacement
For all Engine related maintenance and troubleshooting refer to the Engine Manual.
CAUTION
When installing the Spark Plug,
ensure the threads are aligned with
the threads in the engine so as not to
“cross-thread” the plug.
DO NOT work around the engine while hot.
(A)
Handlebar Repositioning for Storage
(A)
Loosen the Tri-Knobs on both
sides of the Handlebar.
Blade Repositioning
(A)
Removal Diamond Blade.
(B)
Pivot the Handlebar in the
forward direction towards the
motor. Tighten the Tri-Knobs on
both sides of the Handlebar.
(B)
Remove the Cooling Transfer
Hose from the Blade Guard.
27
(C)
Remove the Inner Blade
Flange.
CX-3® MAINTENANCE
(D)
Locate the three Blade Guard
Retaining Bolts.
(G)
Remove the Blade Shaft Cover
Retaining Bolts and the Blade
Shaft Cover.
(E)
Remove the Blade Guard
Retaining Bolts and remove the
Blade Guard.
(H)
Install the Blade Guard on the
opposite side.
(F)
Locate the Blade Shaft Cover
Retaining Bolts.
(I)
Install the Inner Blade Flange,
Blade, Outer Flange and Blade
Retaining Bolt.
(J)
Install the Cooling Transfer Hose
from the Blade Guard.
(K)
Install the Blade Shaft Cover.
28
(L)
Remove the Pointer.
CX-3® MAINTENANCE
(M)
Install the Pointer on the oppo-
site side, next to Blade Guard.
Belt Adjustment and Replacement
In order to ensure the CX-3® operates at peak efciency, the power transmission belt should be inspected monthly and changed if any signs of damage and/or excessive wear is observed.
NOTE: 1. When a new belt is installed, it should be inspected and retensioned after the rst
forty-eight (48) hours of operation.
(A)
Remove the Blade
(See Blade Removal section).
(D)
Check belt for proper tension if ten-
sion is correct, go to Step P (Proper
tension is approximately 1/8-inch
deection of the belt).
(B)
Locate and remove the Belt
Guard Retaining Bolts and then
remove the Belt Guard.
(E)
Locate the four upper Engine
Mounting Nuts on both ends of
the CX-3® motor and loosen.
29
(C)
Inspect the belt for excessive
wear, cracks and cuts – if worn,
proceed to Step E.
(F)
Locate the four lower Engine
Mounting Bolts on both ends of
®
the CX-3
motor and loosen.
CX-3® MAINTENANCE
(G)
Loosen the Motor Tension
Arm. Push the Motor forward to
loosen the belt.
(J)
Obtain and install a new
belt onto the Engine Blade
Shaft Pulleys
(H)
Remove the old belt from the
Engine and Blade Shaft Pulleys.
(K)
Verify the belt is seated in all
grooves of the Engine and Cut-
ting Drum Pulleys.
(I)
Clean and verify the alignment
of the Engine and Blade Shaft
Pulleys.
(L)
Tighten the Motor Tension Arm.
(M)
Check belt for proper tension
(Proper tension is approxi-
mately 1/8-inch deection of the
belt).
(N)
Repeat Steps L and M until
Proper Tension is achieved.
30
(O)
Tighten the Engine Mounting Bolts.
CX-3® MAINTENANCE
(P)
Install the Belt Guard and Belt
Guard Retaining Bolts.
(Q)
Install the Blade (See Blade
Installation section).
31
CX-3® THEORY
THEORY OF DIAMOND BLADES
Diamond blades do not really cut; they grind the material through friction. Diamond crystals, often
visible at the leading edge and sides of the rim/segment, remove material by scratching out particles of hard, dense materials, or by knocking out larger particles of loosely bonded abrasive material. This process eventually cracks or fractures the diamond particle, breaking it down into smaller
pieces. As a result, a diamond blade for cutting soft, abrasive material must have a hard metal
matrix composition to resist this erosion long enough for the exposed diamonds to be properly utilized. Conversely, a blade for cutting a hard, non-abrasive material must have a soft bond to ensure
that it will erode and expose the diamonds embedded in the matrix. These simple principles are the
foundation of “controlled bond erosion”
Types of Cutting
There are two basic types of cutting-Dry or Wet. The choice of which type of blade to use depends
on:
• The requirements of the job
• The machine/tool utilizing the diamond blade
• The preference of the operator
In the case of DRY cutting, the overwhelming popularity and quantity of hand-held saws and the
exible nature of MK Diamond blades to professionally handle most ceramic, masonry, stone and
concrete materials, make the DRY cutting blade a very attractive tool. When using a DRY blade,
the user must be aware of distinct operating practices to ensure optimum performance. DRY cutting
blades require sufcient airow about the blade to prevent overheating of the steel core. This is best
accomplished by shallow, intermittent cuts of the material with periods of “free-spinning” (for several
seconds) between each cut, to maximize the cooling process.
For WET cutting applications, MK has the exact blade to compliment both the material to be cut and
the wet cutting machine to be used. During cutting operations, liberal amounts of water act as a
coolant to support the cutting effectiveness and longevity of the WET blade. Additionally, using water
adds to the overall safety of cutting operations by keeping the dust signature down.
Know All You Can About the Material You Wish to Cut
32
CX-3® ACCESSORIES
ACCESSORIES
ITEM NUMBER DECRIPTION
MK – CX10
1
2
3 159617
4 159618
159615
159616
12” x .100 x 1”
Premium Grade for Cured Concrete
MK – CX10
14” x .125 x 1”
Premium Grade for Cured Concrete
MK – AX10
12” x .125 x 1”
Premium Grade for Asphalt
MK – AX10
14” x .125 x 1”
Premium Grade for Asphalt
5 159619
6 159620
7
8
9
166784
153877
166781
MK – GX10
12” x .110 x 1”
Supreme Grade for Green Concrete
MK – GX10
14” x .110 x 1”
Supreme Grade for Green Concrete
Water Tank System
Tachometer
Lifting Bail
33
CX-3® ORDERING & RETURN
ORDERING INFORMATION
You may order MK Diamond products through your local MK Diamond distributor or, you may order
direct from MK Diamond.
When ordering direct from MK Diamond, please have the following information ready before calling:
• The Model Number of the saw
• The Serial Number of the saw
• Where the saw was purchased and when
• The Part Number for the part(s) being ordered
• The Part Description for the part(s) being ordered
NOTE: There is a $25.00 minimum order when ordering direct from MK Diamond. A $5.00 charge will
be added to orders having a net billing value under $50.00. All purchases must be made using VISA,
MasterCard or American Express.
All parts may be ordered by calling toll free to – 800 421-5830 or 310 539-5221 and asking for
Customer Service. For technical questions, call – 800 474-5594.
RETURN MATERIALS POLICY
To expedite the service relative to the return of a product purchased through MK Diamond, please
observe the following:
NOTE: When returning all items, they must have been purchased within the previous twelve (12)
months.
• Have the Model Number of the saw
• Have the Serial Number of the saw
• Have the location of where the saw was purchased
• Have the date when the saw was purchased
• Contact Customer Service for approval to return the item(s)
• Obtain a Returned Goods Number (RGA) authorizing the return
• Follow the packaging instructions in the following section
• Ensure your item(s) are prepaid to the destination
For returned items, call toll free to – 800 421-5830 or 310 539-5221 and ask for Customer Service.
For technical questions, call – 800 474-5594 or 310 257-2845.
PACKAGING INSTRUCTIONS
• Remove the Cutting Head and Support Angle Assembly
• Dry the saw before shipping
• When packing, include the following: Saw, Diamond Blade, Blade Guard and Support Angle
Assembly and Adjustable Cutting Guide (Other Accessories are not required)
• Package the unit in its original container or one of comparable size (do not ship the unit partially
exposed)
• Ensure all parts are secured in the packaging to prevent moving
AUTHORIZED SERVICE CENTERS
For quicker repair time, you may contact MK Diamond Customer Service, toll free, at 800 421-5830
or 310 539-5221 for the Authorized Service Center closest too you or visit our web site at
www.mkdiamond.com. For technical questions, call – 800 474-5594.
34
CX-3® WARRANTY
CONTACT:
Please contact MK Diamond Products, Inc. Customer Service Department with any questions you
might have regarding distributors, parts or service.
Telephone: (800) 421-5830
Fax: (310) 539-5158
E-mail: Customer_Service@MKDiamond.com
Customer Service Hours: Monday through Friday, 6AM-4PM PST
MK Diamond Products, Inc.
1315 Storm Parkway
Torrance, CA 90501
MK DIAMOND PRODUCTS, INC. LIMITED WARRANTY
MK DIAMOND PRODUCTS, INC. will guarantee every machine they build, to be free from defects in
material and workmanship for (1) one year from date of purchase. The obligation of MK DIAMOND
PRODUCTS, INC. under this warranty is limited to the repair or replacement of any parts which,
under normal use, prove to be defective in material or workmanship. The parts involved or the unit
in question should be returned to MK DIAMOND PRODUCTS, INC. or to a point designated by us,
transportation prepaid.
This warranty does not obligate us to bear the cost of labor or transportation charges in connection
with replacement or repair of defective parts. Likewise, it shall NOT apply to any unit which has been
subjected to misuse, neglect or accident. This warranty does NOT apply to any machine which has
been repaired or altered outside our factory.
This warranty does NOT obligate MK DIAMOND PRODUCTS, INC., with respect to items not of our
manufacture, such as engines, motors, hydraulics, etc., which are subject to their own guarantees and
warranties.
We shall in no event be liable for consequential damages or contingent liabilities arising out of failure
of any equipment or parts to operate properly.
© COPYRIGHT 2012, MK DIAMOND PRODUCTS, INC. ALL RIGHTS RESERVED.
The MK Diamond logo is a registered trademark of MK Diamond Products, Inc. and may not be used,
reproduced, or altered without written permission. All other trademarks are the property of their re-
spective owners and used with permission.
MK Diamond may have patents, patent applications, trade marks, copyrights of other intellectual
property right covering this product in this document.
This manual MUST accompany the equipment at all times. This manual is considered a permanent
part of the equipment and should remain with the unit if resold.
The information and specications included in this publication were in effect at the time of approval for
printing.
35
CX-3® Concrete Saw
OWNERS MANUAL & OPERATING INSTRUCTIONS
MK Diamond Products, Inc.
1315 Storm Parkway
Torrance, CA 90501
Toll-Free: (800) 421-5830
Phone: (310) 539-5221
Fax: (310) 539-5158
www.mkdiamond.com
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