MK Diamond Products MK CX-3 System manual

11.2009
CX-3®
OWNERS MANUAL &
OPERATING INSTRUCTIONS
www.mkdiamond.com
MK Diamond Products, Inc.
Caution: Read all safety and operating instructions
before using this equipment. This owner’s manual
MUST accompany the equipment at all times.
Revision 100
Manual Part# 159345
Gas Powered
Concrete Saw

2
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®Concrete Saw safely and correctly. Please take the time to
familiarize yourself with the CX-3®Concrete Saw by reading and reviewing this manual.
Read and follow all safety, operating and maintenance instructions.
If you should have questions concerning your CX-3®Concrete Saw, please feel free to call our
friendly 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.

3
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 Specications 11
UNPACKING, TRANSPORT and ASSEMBLY
Unpacking 12
Contents 12
Transport 13
Assembly 14
STARTUP, OPERATION and SHUTDOWN
Startup 15-17
Operation 18
Shutdown 19
Cleanup 20
MAINTENANCE AND TROUBLESHOOTING
Maintenance 21-23
Troubleshooting 24-31
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

4
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 efcient
operation of the CX-3®Concrete Saw.
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.
NOTICE
You can cause PROPERTY DAMAGE to your machine if you don’t follow directions.
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.
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.
Before using this saw, ensure that the person operating the equipment has read and understands all
instructions in this manual.
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.

5
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.
In order to prevent injury, keep guards in place and in working order at all times.
KEEP GUARDS IN PLACE
SAFETY PRECAUTIONS
GENERAL SAFETY PRECAUTIONS AND HAZARD SYMBOLS
(
(
)
)
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.
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 conned area.
CX-3®SAFETY
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 inuence of drugs or alcohol.
Whenever necessary, replace nameplate, operation and safety decals when they become
difcult 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.

6
CX-3®SAFETY
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.
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.
ALWAYS USE SAFETY GLASSES
Safety glasses should always be worn when working around power tools. Everyday eye-
glasses 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.
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.
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.

7
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 in-
crease 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.
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.
CX-3®SAFETY
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 func-
tion. 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.

8
CX-3®SAFETY
CALIFORNIA PROPOSITION 65 MESSAGE
Some dust created by power sanding, sawing, grinding, drilling, and other construction activities con-
tain 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/SLTC/silicacrystalline/index.html
http://www.oehha.org/prop65/out_of_date/6022kLstA.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.
Grinding/cutting/drilling of masonry, concrete, metal and other materials with silica in their compo-
sition 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 inha-
lation 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 sub-
stance known to cause cancer. When cutting such materials, always follow respiratory precautions.
SILICA DUST WARNING

9
• 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 modications will void all warranties. Manufacturer does not
assume responsibility for any accident due to equipment modications.
• 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 tile and masonry products. DO NOT use machine to cut wood or
wood products.
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.
CX-3®PRE-START

10
OPERATION & SAFETY DECALS
DO NOT operate
this equipment
before reading
the owners’
manual!
WARNING
!
(A)
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.
!
(B)
CAUTION
DO NOT
operate without
guards in place.
!
(C)
(3 of them)
WARNING
In the event of
blade failure,
replace blade
guard
immediately.
!
(D)
DANGER
The exhaust from this product
contains chemicals known to
the State of California to cause
cancer, birth defects or other
reproductive harm.
!
(E)
DANGER
Lethal exhaust
gases. Use only
in well ventilated
areas. DO NOT
use indoors.
(F)
WARNING
When refueling
stop engine and
allow to cool.
DO NOT overll
tank.
!
(G)
CAUTION
DO NOT
touch hot
surface.
!
(H)
CAUTION
Accidental start hazard.
Disconnect spark plug
prior to servicing.
!
(I)
SERVICE OR
WARRANTY
FOR INFORMATION ON
PLEASE CALL
1-800-474-5594
(J)
(K)
CAUTION
Keep
hands and
feet clear.
!
(L)
(M)
WARNING
Handle bar NOT a lifting point.
!
NOTICE
Overtensioning of belts
will result in premature
crank and/or bearing failure.
!
WARNING
(N)
Console Label Part# 159208
Concrete Saw Warning Label Sheet Part# 166009
Location Description
AMotor Plate Read Manual
BArm Proposition 65, Dust Warning
CShaft Cover & Belt Guard Guards in Place
DBlade Guard Replace Blade Guard
EGas Tank/Side Exhaust/Cancer
FGas Tank/Top Lethal Exhaust
GGas Tank/Top Refueling
HGas Tank/Top Belt Guard Hot Surface
I Gas Tank/Side Accidental Start
JFrame/Back Service
KFrame/Front Hand & Feet Clear
LHandle Lifting Point
MBelt Guard Overtensioning Belts
NConsole Machinery Harzard
CX-3®SAFETY
J
N
B
L
A
CM
I
F
G
H
E
C
K
D
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 [phone].

11
CX-3®PRODUCT SPECIFICATION
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
• Conveniently placed engine controls for ease of usage.
• Height adjusting screw designed to accurately adjust the depth of the cut.
• Ergonomically designed handlebar to reduce operator fatigue.
• Poly micro Belt to ensure maximum power transfer from the engine to the blade.
PRODUCT SPECIFICATIONS
The CX-3®is a versatile gas powered Concrete Saw. Operated and used according to this manual,
the CX-3® will provide years of dependable service.
General Description
The CX-3®is engineered as a portable concrete saw powered by a 6 horsepower, Robin gas engine
or a 6.5 horsepower Honda gas engine or a 7 horsepower Kohler gas engine. The saw is capable of
cutting up to ve (5) inches in depth.
Motor and Weight Specications
Motor and Weight specications for the CX-3® are listed below.
Motor Type 4-Stroke, Overhead valve, single cylinder
Max Power Output 7 Hp / 6.5 Hp / 6 Hp
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 117 lbs.

12
UNPACKING
CX-3®2 Blade Shaft
Wrenches
CX-3
Owner’s Manual
Engine Manual Warranty
Card
Tri-Knob
Washer
Handlebar
Tri-Knob
HandlebarDiamond
Blade
CX-3®UNPACKING
10.2009
CX-3®
OWNERS MANUAL &
OPERATING INSTRUCTIONS
www.mkdiamond.com
MK Diamond Products, Inc.
Caution: Read all safety and operating instructions
before using this equipment. This parts list MUST
accompany the equipment at all times.
Revision 100
Manual Part# 159345
GasPowered
Concrete Saw
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. Lift the Concrete Saw using the lifting
instructions indicated on page 13.
CONTENTS
In the containers, you will nd one (1) CX-3®, one (1) Diamond Blade, two (2) Blade Shaft Wrenches,
one (1) Handlebar, two (2) Handlebar Tri-knobs, two (2) Tri-Knob Washers, one (1) CX-3 Owners
Manual, one (1) Engine Owners Manual and one (1) Warranty card.

13
TRANSPORT
CX-3®TRANSPORT
CAUTION 1. The CX-3®weighs approximately one hundred and seventeen (117 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®.

14
(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®con-
sole frame.
Follow the assembly instructions to prepare your CX-3®for operation.
(A)
Locate the threaded holes on
both sides of CX-3®console
frame.
(B)
Align the handlebar with the
threaded holes on the sides of
the CX-3®console frame.
CX-3®ASSEMBLY
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.
(C)
Locate the Blade Retaining Screw
and the Outer Flange.
(B)
Push Lock Button. Open the
Blade Guard Cover.
NOTE:
Diamond Blade Installation
(A)
Locate Blade Guard lock.
(D)
Loosen the Blade Retaining Screw
while holding the Shaft Wrench
steady. Remove the Blade Retain-
ing Screw and Outer Flange.
(F)
Install the Outer Flange. Verify
it is seated against the blade.
(E)
Install the Diamond Blade
onto the Blade Shaft.
Handlebar Assembly

15
CX-3®STARTUP
(G)
Install the Blade Retaining
Screw.
(H)
Tighten Blade Retaining Screw while
holding the Blade Shaft steady.
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.

16
Filling Fuel Tank
CX-3®START UP
WARNING 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.
NOTE:
(A)
Remove the Fuel Cap. Refer to
Engine Manual for details.
(B)
Ensure fuel level is 1” below the
throat of the Fuel Tank.
1 inch (25mm)
from throat
The pre-start inspection should be performed before beginning any job. If Diamond Blade is worn,
replace the blade before starting work.
Pre-Start Inspection
(A)
Inspect Blade for damage. Verify
the Blade is correct for the mate-
rial being cut.
(C)
Inspect the CX-3®for general
damage and/or loose hardware.
(B)
Inspect Engine for leaks.
Maximum
Fuel Level
(C)
Ensure fuel level is below the
top of the strainer lter.
Maximum
Fuel Level

17
(D)
Check for proper oil level.
Refer to Engine Manual for
details.
Low Level
Proper Oil Level
(G)
Check the Air Filter for
cleanliness. Refer to Engine
Manual for details.
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.
Engine Start
WARNING
(A)
Use the Depth Control Wheel to
raise the Blade clear of the oor.
Refer to Engine Manual for start-
ing procedure.
CX-3®STARTUP
(E)
Ensure fuel level is 1” below the
throat of the Fuel Tank.
1 inch (25mm)
from throat
Maximum
Fuel Level
(F)
Ensure fuel level is below the
top of the strainer lter.
Maximum
Fuel Level

18
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.
(B)
Attach the cooling supply hose
to the Cooling Inlet.
(C)
Lower the Pointer. Using a
Straightedge, align the Pointer to
the Blade by bending the pointer.
(D)
Layout and mark the area to
be cut using a chalk-line. Align
Pointer and Blade to chalk-line.
(E)
Start the CX-3®using the Engine
Start procedure in the engine
manual.
(F)
With the engine running adjust
the throttle approximately half-
way.
(G)
Open Cooling Supply Valve. Ver-
ify proper cooling ow and adjust
the water ow on the Blade to a
desired amount.
(H)
Adjust the throttle as needed to
make the cut. Slowly lower the
Blade until the desired level is
reached and begin the cut.
(I)
Perform the cut using only enough
pressure to follow the original
marked line. Do not attempt to
steer the saw. When the cut is
complete, raise the Blade. Close
Cooling Supply Valve.

19
CX-3®SHUTDOWN
Normal Engine Shutdown
(A)
Raise the Blade Guard off the
ground.
(B)
Move the Throttle Lever to lower
blade speed.
(C)
Place Engine Master Switch in
the OFF position. Place Fuel
Value in the off position.
(D)
Raise the Pointer.
Emergency Engine Shutdown
(A)
Place Engine Master Switch in
the OFF position.
(B)
Move the Throttle Lever to lower
blade speed. Place Fuel Valve in
the OFF position.

20
CX-3®CLEANUP
Cleanup
Engine parts are extremely hot following use, allow engine to cool 1/2-hour
before cleaning. Use care during cleanup to avoid injury.
CAUTION
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 mufer opening.
3. Use care when cleaning around electrical components.
NOTE:
(A)
Verify the engine is off and cool
before beginning to clean. Clean
the CX-3®with soap and water.
(B)
Clean around the Console.
(C)
Clean the Depth Control Screw.
(D)
Clean the remainder of the exte-
rior surface (except the engine).