MK Diamond Products MK-2013HE GX390 User manual

08.2019
MK-20 CONCRETE SAW SERIES
OWNER’S MANUAL
www.mkdiamond.com
Caution: Read all safety and operating instructions
before using this equipment. This owner’s manual
MUST accompany the equipment at all times.
Revision 313
MK-2013HS Part # 155714
Manual Part# 156777
MODELS PART #
MK-2013HE GX390 155714
MK-2013HSP GX390 156499
MK-2020HSP GX630 156498
MK-2024HSP GX690 158777

2
INTRODUCTION
Congratulations on your purchase of a MK-20 Series. 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 MK-20 Series 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 MK-20 Series safely and correctly. Please take the time to familiarize
yourself with the MK-20 Series by reading and reviewing this manual.
Read and follow all safety, operating and maintenance instructions.
If you should have questions concerning your MK-20 Series, 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:
WARRANTY: For your (1) one year warranty to be effective, complete the online Product
Registration as soon as possible. Visit www.mkdiamond.com/registration/

3
TABLE OF CONTENTS
SAFETY
Safety Messages 4
Damage Prevention Message 4
General Safety Precautions and Hazard Symbols 5
California Proposition 65 Message 8
Safety Label Locations 10-11
Product Specications 12
UNPACKING, TRANSPORT and ASSEMBLY
Unpacking 13
Contents 13
Transport 13
Assembly 14-18
SET-UP, OPERATION and SHUTDOWN
Set-Up 18-21
Operation 22-26
Shutdown 26
Cleanup 27
MAINTENANCE
Maintenance 28-34
ACCESSORIES
Accessories 36-37
ORDERING and RETURN INSTRUCTIONS
Ordering Information 38
Return Material Policy 38
Packaging Instructions 38
Authorized Service Centers 38
Contact Information 39
Warranty 39

4
MK-20 SERIES SAFETY
Read and follow all safety, operating and maintenance instructions. Failure to read and follow
these instructions could result in injury or death to you or others. Failure to read and follow these
instructions could also result in damage and/or reduced equipment life. Safety warnings and
guidelines do not by themselves eliminate danger. They are not substitutes for proper accident
prevention procedures and good judgement.
SAFETY 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.
DAMAGE PREVENTION AND INFORMATION MESSAGES
NOTE: Equipment and/or property damage may result if these instructions are not followed.
GENERAL SAFETY PRECAUTIONS AND HAZARD 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.
ALWAYS read this Owner’s Manual before operating the machine. DO NOT operate or
service this equipment before reading this entire manual. Read and understand all warn-
ings, instructions and controls on the machine. Know how to stop the equipment quickly in
case of emergency. It is the operators responsibility to use this machine under safe work-
ing conditions and conform with federal, state and local codes or regulations pertaining to
safety, air, pollution, noise etc...
ALWAYS keep the Blade and Belt Guards in place. DO NOT operate this machine with any
guard or safety device removed. A Guard, or any damaged part should be repaired or
replaced immediately.
NEVER operate this equipment without proper protective clothing, shatterproof
glasses, steel-toed boots and other protective devices required by the job. Non-slip
foot wear is recommended.
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In order to prevent injury, the following safety precautions and symbols should be followed at all times!

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MK-20 SERIES SAFETY
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All visitors and children should be kept a safe distance from work area. Maintain a safe
operating distance to other personnel.
KEEP CHILDREN AWAY
MAKE THE WORKSHOP KID PROOF
Make the workshops kid proof by using padlocks, master switches or by removing starter keys.
ROTATING PARTS
Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never oper-
ate the motor with covers, shrouds, or guards, removed.
OVER SPEED
NEVER tamper with the governor components or settings to increase the maximum speed.
Severe personal injury and damage to the engine or equipment can result if operated at
speeds above maximum.
ELECTRICAL SHOCK
NEVER touch electrical wires or components while the engine is running. Exposed, frayed or
worn electrical wiring and plugs can be sources of electrical shock which could cause severe
injury or burns. Do not touch the plug with wet hands.
ALWAYS avoid inhalation of and skin contact with silica dust and/or mist. Provide proper
dust removal. Use dust-collection system when applicable.
NEVER operate the machine in an explosive atmosphere or near combustible materials.
Sparks from the cutting-action of this machine can ignite flammable materials, liquids, gases
or dust.
This equipment should not be operated by persons under 18 years of age.
ALWAYS wear approved respiratory, head, ear and eye protection
when operating this machine.
Before starting the engine/motor, be sure the ON/OFF switch is in the OFF position to pre-
vent accidental starting. Place the ON/OFF switch in the OFF position before performing any
service operation. ALWAYS place the power ON/OFF switch in the OFF position when the
machine is not in use.
ACCIDENTAL STARTS!
PERSONAL PROTECTIVE EQUIPMENT
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.
HOT PARTS!
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DO NOT FORCE THE TOOL
A power tool will do a job better and safer operating at the rate for which it was designed.
DO NOT force a tool or an attachment to do a job that it was not designed to do.
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6
MK-20 SERIES SAFETY
Consult the owner’s manual for recommended accessories. Using improper accessories
may increase the risk of personal or by-stander injury. Unauthorized equipment
modifications will void all warranties. Manufacturer does not assume responsibility for any
accident due to equipment modifications.
ALWAYS ensure that the machine is on level ground before using.
Serious injury could occur if a power tool is tipped, or if a cutting tool is unintentionally
contacted.
When loading or unloading the machine, use caution. Remove the blade prior to hoisting,
loading and transporting the machine.
USE RECOMMENDED ACCESSORIES
NEVER STAND ON THE TOOL
TRANSPORT
Form a habit of checking to see that keys and adjusting wrenches are removed from
the power tool before it is turned on.
Cluttered work areas and benches invite accidents. Keep area around machine clear of
obstructions which could cause persons to fall.
DO NOT operate equipment in dangerous or hazardous environments. DO NOT use power
tools in damp or wet locations nor expose them to rain. Always keep the work area well
lighted.
REMOVE ADJUSTING KEYS AND WRENCHES
KEEP WORK AREA CLEAN
DO NOT USE IN DANGEROUS PLACES
MAINTAIN TOOLS WITH CARE
Keep tools clean and maintained for the best and safest performance. Always follow
maintenance instructions and examine the machine before use. If any abnormal vibrations
or noises occurs, turn off machine immediately and have the problem corrected before
further use.
DISCONNECT TOOLS
Power tools should always be disconnected before servicing, adjusting or when changing
accessories, such as blades, bits, cutters, and the like.
DO NOT OVERREACH
Keep proper footing and balance at all times by not overreaching.
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SECURE WORK
Clamps or a vise should be used to hold work whenever practical. Keeping your hands free
to operate a power tool is safer.
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USE PROPER APPAREL
DO NOT wear loose clothing, gloves, neckties, rings, bracelets, or other jewelry that may
be caught in moving parts. Non-slip footwear is recommended. Wear protective hair cover-
ing to contain long hair.
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MK-20 SERIES SAFETY
Before using a power tool, check for damaged parts. A guard or any other part that is
damaged should be carefully checked to determine if it would operate properly and
perform its intended function. Always check moving parts for proper alignment or binding.
Check for broken parts and 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. Always check the machine for loose bolts before starting.
A blade or cutter should always be installed so that rotation is in the direction of the
arrow imprinted on the side of the blade or cutter. It should correspond with the rotational
direction of the motor. Always feed work into a blade against the direction of rotation.
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 finished.
NEVER LEAVE A TOOL UNATTENDED
CHECK FOR DAMAGED PARTS
DIRECTION OF ROTATION
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 modifications will void all warranties. Manufacturer does not assume
responsibility for any accident due to equipment modifications.
NEVER operate this equipment under the influence of drugs or alcohol.
NEVER operate this equipment when not feeling well due to fatigue, illness or taking medicine.
NEVER use this machine with any cutter designed for woodworking.
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On belt driven equipment, overtensioning of belts will result in premature crank and/or bearing
failure.
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
DO NOT lend or rent this equipment without including the Owner's Manual and the Engine/
Motor Manufacturer's Manual.
Check the chemical properties of the material to be cut/grinded and follow all EPA/OSHA
Regulations. (cut/ground)

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MK-20 SERIES SAFETY
CALIFORNIA PROPOSITION 65 MESSAGE
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 ad-
dition, 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/topics/respirators
Observe OSHA regulations for respirator use (29 C.F.R.§1910.134).
Visit http://www.osha.gov for more information.
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/dsg/topics/silicacrystalline/index.html
http://www.cdc.gov/niosh/docs/96-112/
http://oehha.ca.gov/prop65/law/P65law72003.html
http://www.dir.ca.gov/Title8/sub4.html
http://www.P65warnings.ca.gov
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 dust masks that are specially designed to lter out microscopic particles. Where
use of a dust extraction device is possible, it should be used. To achieve a high level of dust collec-
tion, use an industrial HEPA vacuum cleaner. Observe OSHA 29 CFR part 1926.57 and 1926.103.

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NOTES
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 con-
tacts hot parts or sparks from ignition. DO NOT overll tank. DO NOT start the engine near
spilled fuel. Never use gasoline as a cleaning agent.
Gasoline models are shipped from the factory dry, meaning without fuel or oil. Both must be added
before equipment can be used. Check the engine Manufacturer Owner's Manual for instructions on
fueling, break-in, servicing and proper engine care and use.
Refer to engine manufacturer manual for specic operating procedures and safety warnings.
ALWAYS check the fuel lines and fuel tanks for leaks and cracks before starting the engine.
DO NOT run the machine if fuel leaks are present or the fuel lines are loose.
Accidental start hazard. Disconnect spark plug prior to servicing.
EXPLOSIVE FUEL!
GAS SAFETY PRECAUTIONS
GAS ENGINE SAFETY
Engine exhaust gasses contain poisonous carbon monoxide (an odorless, colorless gas).
Avoid inhaling exhaust fumes Breathing it can cause unconsciousness and even kill you.
Always operate gasoline engine machines in a well-ventilated area. DO NOT operate in ar-
eas where exhaust fumes could accumulate without wearing appropriate respiratory protec-
tion. Never run the engine in a closed building or conned area.
LETHAL EXHAUST GASES!
ALWAYS rell fuel tank in a well-ventilated area.
ALWAYS replace the fuel tank cap after refueling.
ALWAYS close fuel value on engines when machine is not being operated.
FUELING SAFETY
ALWAYS use caution when handling fuel. Shut off the engine and allow to cool before refueling.
Move the machine at least 10 feet (3 meters) from the fueling point before starting the engine, and
make sure the gas cap is on the machine and the fuel can is properly tightened.
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NOTE: Prior to operation of this machine the operator must determine the existence and
location of any subsurface features that may be hazardous or could damage the
equipment, (i.e. electric cable, natural gas line etc.).

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OPERATION & SAFETY DECALS
Part # 164202
A
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Part # 155587 (3)
CAUTION
DO NOT
operate without
guards in place.
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Part # 155588
WARNING
In the event of blade
failure, replace
blade guard
immediately.
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Part # 155038
SERVICE OR
WARRANTY
FOR INFORMATION ON
PLEASE CALL
1-800-474-5594
Part # 170480
Part # 155585
CAUTION
Keep
hands and
feet clear.
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Part # 154399
NOTICE
Overtensioning of belts will
result in premature crank
and/or bearing failure.
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Part # 155579
CAUTION
DO NOT
touch hot
surface.
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Part # 155578
CAUTION
Accidental start hazard.
Disconnect spark plug prior
to servicing.
!
Part # 155580
WARNING
When refueling
stop engine and
allow to cool.
DO NOT
overll tank.
!
Console Label Part # 156749
WARNING
• Use of this equipment can expose you to chemicals
including nickel and crystalline silica which are known to
the State of California to cause cancer.
• For more information go to www.P65Warnings.ca.gov.
• Repeated and/or substantial inhalation can cause
serious or fatal respiratory diseases including silicosis.
• Employ dust controls and protection per
OSHA/NIOSH/MSHA.
!
Label Part #164202
B
K
M
WARNING
Always wear safety approved
hearing, eye, head and
respiratory protection
DO NOT operate this
equipment before reading
the owner’s manual.
WARNING: This equipment contains chemicals known to
the State of California to cause cancer and birth defects or other
reproductive harm. These chemicals are contained in various
components, fluids and paint, including but not limited to, fuel, oil,
electric motors and batteries. In addition, gasoline/diesel powered
equipment emits engine exhaust and fumes, and when serviced,
cleaned or maintained generate used oil, waste fluids, fumes,
grease, grime and particulates from component wear and silica dust
which contain chemicals known to the State of California to cause
cancer and birth defects or other reproductive harm.
For more information go to www.P65Warnings.ca.gov.
!
DANGER
Lethal exhaust
gases. Use only
in well ventilated
areas. DO NOT
use indoors.
Location Description
AGas Tank - Top Warning - Silica
BFrame - Side Read Manual
CShaft Cover/Belt Guard/Blade Guard Guards in Place
DBlade Guard - Top Replace Blade Guard
EConsole Service
FFrame - Front Hand & Feet Clear
GBelt Guard - Front Overtensioning Belts
HGas Tank - Side Refueling
IBelt Guard Hot Surface
JBelt Guard Accidental Start
KConsole Prop 65
LConsole QR Code for Manuals
MConsole Lethal Exhaust
NConsole Machinery Hazard
MK-20 SERIES SAFETY
The MK-20 Series Concrete Saw is equipped with a number of safety decals. These decals are pro-
vided for operator safety and maintenance information. Should any of these operation or safety de-
cals become unreadable, replacements can be obtained by calling [phone].
NEUTRAL
REVERSE
FORWARD
RAISE BLADE TO
CLEAR PAVEMENT
WHEN MANEUVERING
LOWER BLADE
SLOWLY INTO CUT
RAISE
T
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S
M
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S
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DEPTH GAUGE
LOWER
MK20 Series Console Part # 156749
SLOW
FAST
TOUCH BLADE TO SURFACE
TURN DIAL TO ZERO
WARNING
DO NOT operate this
equipment before reading
the ownerʼs manual.
Always wear safety approved
hearing, eye, head and
respiratory protection.
Lethal exhaust
gases. Use only
in well ventilated
areas. DO NOT
use indoors.
WARNING
DO NOT operate this
equipment before reading
the ownerʼs manual.
Always wear safety approved
hearing, eye, head and
respiratory protection.
Lethal exhaust
gases. Use only
in well ventilated
areas. DO NOT
use indoors.
WARNING: This equipment contains chemicals
known to the State of California to cause cancer
and birth defects or other reproductive harm. These
chemicals are contained in various components, fluids
and paint, including but not limited to, fuel, oil, electric
motors and batteries. In addition, gasoline/diesel
powered equipment emits engine exhaust and fumes,
and when serviced, cleaned or maintained generate
used oil, waste fluids, fumes, grease, grime and
particulates from component wear and silica dust which
contain chemicals known to the State of California to
cause cancer and birth defects or other
reproductive harm.
For more information go to www.P65Warnings.ca.gov.
!
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CK
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A
Location of Safety Decals for models: MK-2013HE, MK-2013HSP

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Location Description
AGas Tank - Top Warning - Silica
BGas Tank - Top Read Manual
CShaft Cover/Belt Guard/Blade Guard Guards in Place
DBlade Guard - Top Replace Blade Guard
EFrame - Side Service
FFrame - Front Hand & Feet Clear
GBelt Guard - Front Overtensioning Belts
HGas Tank - Top Refueling
IBelt Guard Hot Surface
JBelt Guard Accidental Start
KGas Tank - Top Exhaust/Cancer
LConsole QR Code for Manuals
MGas Tank - Top Lethal Exhaust
NConsole Machinery Hazard
MK-20 SERIES SAFETY
NEUTRAL
REVERSE
FORWARD
RAISE BLADE TO
CLEAR PAVEMENT
WHEN MANEUVERING
LOWER BLADE
SLOWLY INTO CUT
RAISE
T
R
A
N
S
M
I
S
S
I
O
N
DEPTH GAUGE
LOWER
MK20 Series Console Part # 156749
SLOW
FAST
TOUCH BLADE TO SURFACE
TURN DIAL TO ZERO
WARNING
DO NOT operate this
equipment before reading
the ownerʼs manual.
Always wear safety approved
hearing, eye, head and
respiratory protection.
Lethal exhaust
gases. Use only
in well ventilated
areas. DO NOT
use indoors.
WARNING
DO NOT operate this
equipment before reading
the ownerʼs manual.
Always wear safety approved
hearing, eye, head and
respiratory protection.
Lethal exhaust
gases. Use only
in well ventilated
areas. DO NOT
use indoors.
WARNING: This equipment contains chemicals
known to the State of California to cause cancer
and birth defects or other reproductive harm. These
chemicals are contained in various components, fluids
and paint, including but not limited to, fuel, oil, electric
motors and batteries. In addition, gasoline/diesel
powered equipment emits engine exhaust and fumes,
and when serviced, cleaned or maintained generate
used oil, waste fluids, fumes, grease, grime and
particulates from component wear and silica dust which
contain chemicals known to the State of California to
cause cancer and birth defects or other
reproductive harm.
For more information go to www.P65Warnings.ca.gov.
!
N
I
F
E
C
G
J
C
D
C
KM
B
H
Locations of Safety Decals for models: MK-2024HSP, and MK-2020HSP
A

12
MK-20 SERIES PRODUCT SPECIFICATION
Blade
The MK-20 Series uses a 18" to 20" diameter diamond blade.
Concrete Saw Usage
The MK-20 Series is designed to cut various grades of concrete surfaces.
PRODUCT SPECIFICATIONS
The MK-20 Series is a versatile gas powered Concrete Saw. Operated and used according to this
manual, the MK-20 Series will provide years of dependable service.
General Description
The MK-20 Series is engineered as a portable concrete saw powered by a Honda gas engine. The
saw is capable of 6-5/8" depth of cut with an 18" blade and 7-5/8" depth of cut with a 20" blade.
Model MK2013HE MK2013HSP MK-2020HSP MK-2024HSP
Engine Honda (Gas) Honda (Gas) Honda (Gas) Honda (Gas)
Power GX390 GX390 GX630 GX690
Starter Pull Pull Electric Electric
Fuel Capacity 1.6 Gallons 1.6 Gallons 1.6 Gallons 1.6 Gallons
Blade Capacity 18" 18" 20" 20"
Blade RPM 3,400 3,400 2,863 2,863
Depth of Cut 6-5/8" (167 mm) 6-5/8" (167 mm) 7-5/8" (194 mm) 7-5/8" (194 mm)
Weight 290 lbs. (132 kg) 310 lbs. (141 kg) 392 lbs. (178 kgs) 398 lbs. (181 kg)
Part # 155714 156499 156498 158777
Motor and Weight Specications
Motor and Weight specications for the MK-20 Series are listed below.
MK-20 Series Series Features
• One-piece box construction chassis made from 3/16" hot-rolled steel
• Powder-coated chassis resists peeling and corrosion
• Cast-aluminum hinged blade guard
• Stainless steel water distribution system supplies water to both sides of blade
• Blade guard mounts on both left- or right-hand side of saw and cuts within 2" of wall or curb
• Heavy-duty blade shaft supported by two 1-3/16", self-aligning pillow blockbearings
• Depth control assembly engineered for smooth, controlled blade insertion
• Built-in tach/hour meter
• Depth feed gauge indicator
• Heavy-duty hydro static transmission with variable speed drive
• Durable 8" x 2-1/4" non-slip rubber wheels with maintenance-free hubs & roller bearings
• Forward travel speed: 0-80’ minute

13
UNPACKING
MK-20 Series
Saw
1 Blade Nut
Wrench
Engine Manual Warranty
Card
MK-20 Series
Owner’s Manual
Pointer
Handlebar
Bolts and Washers
Handlebar
MK-20 SERIES UNPACKING
08.2019
MK-20 CONCRETE SAW SERIES
OWNER’S MANUAL
www.mkdiamond.com
Caution: Read all safety and operating instructions
before using this equipment. This owner’s manual
MUST accompany the equipment at all times.
Revision 313
MK-2013HS Part # 155714
Manual Part# 156777
MODELS PART #
MK-2013HE GX390 155714
MK-2013HSP GX390 156499
MK-2020HSP GX630 156498
MK-2024HSP GX690 158777
Your saw has been shipped from the factory thoroughly inspected. Only minimal assembly and
service is required. Check each item, making certain all items are accounted for and in good visual
condition before discarding any packing materials. If there are any missing or damaged parts call MK
Diamond Customer Service at 800-421-5830.
CONTENTS
In the containers, you will nd one (1) MK-20 Series Saw, one (1) Blade Nut Wrench, one (1) Handle-
bar, two (2) Handlebar Bolts and Washers, one (1) Pointer, one (1) MK-20 Series Owner’s Manual,
one (1) Engine Owners Manual, one (1) Warranty Card.
WARNING Never start engine until all initial servicing and set up steps are completed accord-
ing to this operations manual and engine manual. Read and familiarize yourself
with all controls and features of the saw before beginning operations.
Remove the saw from the pallet and place it on a at surface. Two people are required to lift saw.
TRANSPORT
CAUTION 1. The MK-20 Series weighs approximately two hundred and thirty-ve (235
pounds), use care when transporting.
2. Two people are required to lift and transport the MK-20 Series.

14
DESCRIPTION OF CONTROLS
MK-20 SERIES ASSEMBLY
1. The Depth Control Wheel raises the blade when rotated clockwise, and lowers the blade
when rotated counterclockwise.
2. The keyed ignition switch turns clockwise to the on and start positions. The engine turns
over with the switch in the start position. Release the key after the engine starts.
3. When the engine is running, the Tach/Hour Meter display will indicate the engines RPM.
When the engine is shut off, the display will switch to run time, initially in minutes, and
then switching to hours after the rst hour of operation.
4. The Transmission Speed Lever moves the saw forward by pushing the lever away from
the operator and moves the saw in reverse by pulling the lever toward the operator.
Always place this control in central neutral position before using the engage/disengage
lever or starting or stopping the engine.
5. The Throttle control increases engine rpm from slow (idle) at the bottom, to fast
(full rpm) at the top.
6. Depth Gauge should be adjusted to zero when setting up the saw.
7. Use water hose bib for wetting cutting. After connecting hose, turn on the water at the
source and use Water Control Lever to control ow of water to the blade. Be sure that
both sides of the blade are getting adequate ow of water.
8. Water Control Lever is off in the vertical position and fully on in the horizontal position. It
may be placed at in between settings to regulate the water ow.
9. The Transmission Engage/Disengage Lever is engaged in the full down position.
10. The Choke is located on the back panel for convenient cold starting.
1
3
45
6
7
8
9
10
2

15
MK-20 SERIES 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.
(C)
Install one Washer onto each bolt.
Install bolt through the Handlebar
and into the holes and tighten.
Follow the assembly instructions to prepare your saw for operation.
(A)
Locate the threaded holes on
both sides of the handlebar.
(B)
Align the handlebar with the
holes on both sides of the frame at
the desired height.
HANDLEBAR ASSEMBLY
The engine is shipped with no oil in the crankcase. Refer to the engine manual for de-
tails on the type and amount of oil required.
To ll the crankcase with oil, place the engine level. In order for this to be accomplished
the blade must not be installed, and the depth adjustment must be down (until the en-
gine is level).
The engine and oil must be warm and your saw must
be on level ground to get an accurate oil level reading.
NOTE:
NOTE:

16
(A)
Remove the front tower panel to ob-
tain access to the battery terminals.
(A)
Check the oil level on the expansion
tank to ensure that the transmission
has adequate uid.
(B)
Connect the positive (+) battery
cable to the positive battery terminal.
Connect the negative battery cable
to the negative terminal. Tighten
the cap screws and nuts securely
to assure proper electrical contact.
Replace panel.
MK-20 SERIES ASSEMBLY
BATTERY PREPARATION
HYDRO-STATIC TRANSMISSION
The 12 volt battery is shipped wet and charged. Connect the battery leads according to the following
steps to ensure that power is provided to the engines electric starter.
The Hydro-Static Transmission is factory lled with uid having a viscosity equivalent to SAE 20 W 20.
Do not overll the expansion tank. Notice that the full level line is near the
bottom of the expansion tank. Over lling will result in rupturing the seals
on the hydromatic transmission and subsequent mechanical damage.
When tightening the positive (+) battery cable end, do not contact the nega-
tive (-) battery terminal with the wrench or other metallic objects. This could
cause an electrical short and electrical sparking or an explosion of the battery.
Be careful not to connect the battery in reverse polarity, as this will short circuit
the battery charging system causing the fuse on the engine to become dam-
aged, and also possibly resulting in an explosion of the battery.
NOTICE
WARNING

17
MK-20 SERIES ASSEMBLY
1. When installing the 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.
2. When installing the blade ensure that the blade shaft and anges are free from dirt
and all foreign material before mounting blade on the blade shaft. Tightening a blade
against an uneven surface can cause fracture or cause the blade to run out of alignment.
3. Blade shaft threads are left-handed on the right side of the saw and right-hand on the
left of the saw.
(A)
Open the Blade Guard Cover.
Locate the Blade Shaft Nut and the
Outer Flange.
NOTE:
DIAMOND BLADE INSTALLATION
(B)
Loosen the Blade Shaft Nut while
holding the Shaft Wrench steady.
(F)
Install the Blade Shaft Nut.
(C)
Remove the Blade Nut and Outer
Flange.
(D)
Install the Diamond Blade onto the
Blade Shaft and Drive Pin. Ensure
directional arrow on the blade indi-
cates proper rotational direction.
(E)
Install the Outer Flange. Verify the
drive pin is seated; it must project
through the hole in the blade and into
the ange.
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.
CAUTION

18
FILLING FUEL TANK
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. Fuel in a well-ventilated area.
4. Keep gasoline away from appliance pilot lights, barbecues, electric appliances,
power tools, etc.
5. Wipe up spills immediately. Do not start engine until spill is dry.
6. When lling the fuel tank do not overll. Always leave enough area for
expansion due to environmental heating.
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.
(B)
Ensure fuel level is 1" below the
throat of the Fuel Tank.
1 inch (25mm)
from throat
Maximum Fuel
Level
MK-20 SERIES ASSEMBLY
(G)
Tighten Blade Shaft Nut holding
the Blade Shaft steady. Lower and
close Blade Guard.
Raise the blade as high as possible when
maneuvering so that the blade will not strike
the pavement. The blade is spinning when-
ever the saw is running.
Refer to Engine Manual for detailed instructions.
NOTE:

19
MK-20 SERIES SET-UP
FRONT POINTER ALIGNMENT
The Front Pointer is set in line at the factory. However, the pointer should be checked for proper
alignment with the blade after every use.
(A)
Using a straight edge, care-
fully mark a line 12 feet long on
a smooth level concrete surface.
Place Saw parallel to line; lower
Blade and center it over the line.
(B)
With the Blade centered over the
line and the Saw Frame parallel
to the line, lower the front Pointer
assembly and position the pointer
over the line.
(C)
Adjust the Pointer in or out if the
orange wheel is off the line by loos-
ening the thumbscrew on the end of
pointer. Align orange wheel with line
and tighten thumbscrew. Roll saw
along the entire length of the line to
ensure proper alignment.
The pre-start inspection should be performed before beginning any job.
PRE-START INSPECTION
(A)
Inspect Blade for damage for
cracks and wear, replace if nec-
essary. Verify the Blade is cor-
rect for the material being cut.
(C)
Inspect the saw for general dam-
age and/or loose hardware. Check
that the equipment covers and
guards are in place and securely
fastened.
(B)
Inspect Engine for leaks.
Make sure surfaces are clean
and unobstructed.

20
MK-20 SERIES SET-UP
ADJUSTING DEPTH OF CUT GAUGE
(A)
Turn Crank Wheel until Blade
touches the ground.
(B)
Turn the Depth Gauge Indicator
dial clockwise until it reads zero.
(D)
Check for proper oil level.
Refer to Engine Manual for details.
Low Level
Proper Oil Level
(F)
Check the Air Filter for
cleanliness. Refer to Engine Manual
for details.
(E)
Ensure fuel level is 1" below the
throat of the Fuel Tank.
1 inch (25mm)
from throat
Maximum Fuel
Level