MK Diamond Products MK-20 SERIES User manual

05.2013
MK-20 SERIES
OWNER’S MANUAL,
OPERATING INSTRUCTIONS
& PARTS LIST
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 304
Manual Part# 156777
Gas Powered
Concrete Saw

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:
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 14-15
SET-UP, OPERATION and SHUTDOWN
Set-Up 16-18
Operation 19-22
Shutdown 23
Cleanup 23
MAINTENANCE
Maintenance 24-30
EXPLODED VIEW & PARTS LIST
Figure 1 Assy, Saw 2020HSP Part # 156498 32-36
Figure 2 Assy, Saw 2024HSP Part # 158777 37-41
Figure 3 Frame, Less Engine Part # 169713 42-45
Figure 4 Assy, Blade Shaft Part # 156654 46
Figure 5 Engine, Honda GX630 Part # 169713 47
Figure 6 Engine Honda GX690 Part # 170048 48
Figure 7 Assy, Pointer Part # 166465 49
ORDERING and RETURN INSTRUCTIONS
Ordering Information 50
Return Material Policy 50
Packaging Instructions 50
Authorized Service Centers 50
Contact Information 51
Warranty 51

4
MK-20 SERIES 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 MK-20 Series. For additional instruction concerning engine operations and care refer
to the engine manufacturers instructions.
Descriptions, illustrations, and photos are as accurate as possible at the time of publication. Photos
may include optional equipment or accessories and may not show all models covered by 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.
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
MK-20 SERIES SAFETY
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.
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
MK-20 SERIES 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.
MK-20 SERIES 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 if it would operate properly and perform its intended function
safety. Always check moving parts for proper alignment or binding. Check for broken parts, mount-
ings 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
always be installed such that rotation is in the direction of the arrow imprinted on the side of the blade
or cutter.

8
MK-20 SERIES SAFETY
Sawing and drilling generate dust. Excessive airborne particles may cause irritation to eyes, skin and
respiratory tract. To avoid breathing impairment, always employ dust controls and protection suitable
to the material being sawed or drilled; See OSHA (29 CFR Part 1910.1200).
WARNING
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, 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
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 vacuum cleaner.
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.
ON
(
(
))

9
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 overfill
tank.
!
(G)
CAUTION
DO NOT
touch hot
surface.
!
(H)
CAUTION
Accidental start hazard.
Disconnect spark plug
prior to servicing.
!
(I)
SERVICE OR
WARRANTY
FORINFORMATIONON
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.
!
Concrete Saw Warning Label
Sheet Part# 166009
Location Description
AFrame Read Manual
BFrame Proposition 65, Dust Warning
CShaft Cover & Belt Guard Guards in Place
DBlade Guard Replace Blade Guard
EGas Tank/Top Exhaust/Cancer
FGas Tank/Top Lethal Exhaust
GGas Tank/Top Refueling
HGas Tank Hot Surface
I Blade Guard Accidental Start
JFrame/Back Service (Not Shown)
KFrame/Front Hand & Feet Clear
LHandle Lifting Point
MBelt Guard Overtensioning Belts
NConsole Machinery Hazard
MK-20 SERIES SAFETY
H
GFA
L
N
E
I
MC
C
B
D
C
K
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].
(N)

10
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, Kohler, Subaru or
Vanguard 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 MK2013HSP MK-2013SE MK-2013SSP MK-2013VSP
Engine Honda (Gas) Subaru (Gas) Subaru (Gas) Vanguard (Gas)
Power GX390 EH41 EH41 V-Twin
Starter Pull Electric Pull Pull
Fuel Capacity 1.6 Gallons 1.6 Gallons 1.6 Gallons 1.6 Gallons
Blade Capacity 18” 18” 18” 18”
Blade RPM 3,400 3,400 3,400 3,400
Depth of Cut 6-5/8” (167 mm) 6-5/8” (167 mm) 6-5/8” (167 mm) 6-5/8” (167 mm)
Weight 310 lbs. (141 kg) 290 lbs. (132 kgs) 310 lbs. (141 kg) 310 lbs. (141 kg)
Part # 156499 155714-S 156499-S 169949
Model MK2014K MK-2020HSP MK-2024HSP MK-2022SSP
Engine Kohler (Gas) Honda (Gas) Honda (Gas) Subaru (Gas)
Power CH440 GX630 GX360 EH65
Starter Pull Electric Electric Electric
Fuel Capacity 1.6 Gallons 1.6 Gallons 1.6 Gallons 1.6 Gallons
Blade Capacity 18” 20” 20” 20”
Blade RPM 3,400 2,863 2,863 2,850
Depth of Cut 6-5/8” (167 mm) 7-5/8” (194 mm) 7-5/8” (194 mm) 7-5/8” (194 mm)
Weight 310 lbs. (141 kg) 392 lbs. (178 kgs) 398 lbs. (181 kg) 398 lbs. (181 kg)
Part # 168798 156498 158777 168952
Motor and Weight Specications
Motor and Weight specications for the MK-20 Series are listed below.

11
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
03.2012
MK-20 SERIES
OWNER’S MANUAL &
OPERATING INSTRUCTIONS
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 201
Manual Part# 156777
Gas Powered
Concrete Saw
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.
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

12
1
2
3
45
6
TRANSPORT
DESCRIPTION OF CONTROLS
MK-20 SERIES 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.
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 bibb 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.
7
8
9
10

13
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:

14
(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

15
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.
(G)
Tighten Blade Shaft Nut holding
the Blade Shaft steady. Lower and
close Blade Guard.
(E)
Install the Outer Flange. Verify the
drive pin is seated; it must project
through the hole in the blade and into
the ange.
WARNING Do not operate the saw without the proper
Blade Guard covering. Ensure that the blade
exposure does not exceed 180 degrees during
operation.
Raise the blade as high as possible when ma-
neuvering so that the blade will not strike the
pavement. The blade is spinning whenever the
saw is running.
NOTE:
DO NOT use woodcutting, or carbide blades
on this machine! Use ONLY Diamond
blades on machine.

16
FILLING FUEL TANK
MK-20 SERIES SET-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. Fuel in a well-ventilated area.
4. Keep gasoline away from appliance pilot lights, barbeques, 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
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.

17
(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.
MK-20 SERIES SET-UP
(E)
Ensure fuel level is 1” below the
throat of the Fuel Tank.
1 inch (25mm)
from throat
Maximum Fuel
Level
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.
• 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

18
MK-20 SERIES SET-UP
ADJUSTING DEPTH OF CUT GAUGE
BLADE SPEED AND THROTTLE SETTING
(A)
Turn Crank Wheel until Blade
touches the ground.
(B)
Turn the Depth Gauge Indicator
dial clockwise until it reads zero.
Operating saw blades at rotational speeds greater than those recommended
by the manufacturer can cause blade damage and possibly subsequent per-
sonal injury.
Never exceed 3600 rpm blade shaft speed.
* The MK-20 Series, it is possible to cause overspeeding of the blade at throttle
settings above those stipulated on the above chart; DO NOT EXCEED THESE
ENGINE RPM SETTINGS!
WARNING
(
(
)
)
Since diamond blades cut best at specic rim-speeds, blades of different diameters
must be turned at different blade shaft rpm’s.
The MK-2013/14 will run either a 16” or 18” blade and the MK-2020/24/22 HSP will run
a 16” through 20” blade.
Safe, efcient, economical cutting performance will occur at the engine rpm (as read on
the tachometer) stipulated on the following chart.
The MK-20 Series engine shaft to blade shaft ratio is 1:895.
Blade Diameter set engine rpm to*
14” full throttle (3500)
16” 3200-full throttle
18” 2850-3300
20” 2550-3000

19
DO NOT crank engine for more than 30 seconds at a time. If engine fails to
start, wait about 2 minutes between cranking periods to prevent starter from
overheating.
NOTICE
Read the engine instructions manual before starting saw.
NOTICE
MK-20 SERIES OPERATION
STANDARD OPERATION
The MK-20 Series is intended for industrial applications and operated by experienced professionals.
The operator must be aware of the machine’s capabilities and limitations. It is the operators respon-
sibility 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...
(A)
Use the Depth Control Wheel to
raise the blade clear of the oor.
(B)
Attach the cooling supply hose
to the Cooling Inlet, if wet cut-
ting.
(C)
Layout and mark the area to be
cut using a chalk-line. Align Pointer
and Blade to chalk-line.
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...)
Be sure blade is unobstructed and not resting on ground.
Be sure hands and feet are clear of blade.
CAUTION
WARNING
Carbon monoxide gas is toxic, breathing it can cause unconsciousness
and/or death. Ensure that the space is adequately ventilated.
WARNING
Allow engine to warm up at least 3 minutes before applying load. When engine
is warm, throttle may be used out to maximum position. Special precautions
should be taken during the break-in period as specied by the Engine Manual.
NOTICE
Avoid any areas or actions that expose you to carbon monoxide.
If the saw should stall for any reason, raise the blade out of the cut before
restarting the engine.

20
(K)
When the cut is complete, raise
the Blade completely out of the cut
by turning Depth Control Wheel
counter-clockwise.
MK-20 SERIES OPERATION
(L)
Close Cooling Supply Valve.
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 reduce 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.
NOTE:
(J)
Slowly lower the Blade until the
desired level is reached and begin
the cut.
(H)
For Wet Cutting, open Cooling
Supply Valve. Verify proper cooling
ow and adjust the water ow on
the Blade to a desired amount.
(G)
Start engine by rotating Ignition
Switch to the right.
(I)
Move the throttle all the way for-
ward to “Fast” position.
(D)
Place Transmission Speed
Lever in Neutral.
(E)
Verify Neutral Engagement Handle
is down, in Neutral. Choke engine
as required for cold starting.
(F)
Push Engine Throttle Handle up
half-way.