MK Diamond Products MK-370EXP TILE SAW User manual

04.2009
MK-370EXP TILE SAW
OWNERS MANUAL &
OPERATING INSTRUCTIONS
www.mkdiamond.com
MK Diamond Products, Inc.
Caution: Read all safety and operating instructions before
using this equipment.This owners manual MUST accompany
the equipment at all times.
Revision 301
Manual Part No. 160084

2
Congratulations on your purchase of a MK-370EXP Tile Saw. We are certain that you will be pleased
with your purchase. MK Diamond takes pride in producing the finest construction power tools and
diamond blades in the industry.
Operated correctly, your MK-370EXP 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-370EXP safely and correctly. Please take a few minutes to familiarize yourself with
the MK-370EXP by reading and reviewing this manual.
If you should have questions concerning your MK-370EXP, please feel free to call our friendly customer
service department at: 800 421-5830
Regards,
MK Diamond
MK-370EXP NOTES
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
MK-370EXP TABLE OF CONTENTS
MK-370EXP PAGE
NO.
SAFETY
Safety Message/Alert Symbols,Warnings 4-6
Hazard Symbols 7
Electric Motor Safety 8-10
Operation & Safety Decals 11
PRODUCT SPECIFICATIONS
Specications 12
SET-UP
Unpacking,Transport, Stand, & Assembly 13-20
Adjustment & Operation 21-25
Cleanup 26-27
Maintenance & Troubleshooting 28-40
EXPLODED VIEW AND PART LIST
Exploded View Saw 42
Parts List 43
Exploded View Table 44
Parts List 45
THEORY
Theory of Diamond Blades 46
ACCESSORIES
Accessories List 47
ORDERING & RETURN INSTRUCTIONS
Ordering & Return Information 48

4
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 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.
In order to prevent injury, the following safety precautions and symbols should be followed at all times!
GENERAL SAFETY PRECAUTIONS AND HAZARD SYMBOLS
SAFETY PRECAUTIONS
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.
DO NOT use power tools in damp or wet locations nor expose them to rain. Always keep
the work area well lighted.
All visitors and children should be kept a safe distance from work area.
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.
ALWAYS keep the Blade Guards in place.
REMOVE ADJUSTING KEYS AND WRENCHES
KEEP WORK AREA CLEAN
KEEP CHILDREN AWAY
DO NOT USE IN DANGEROUS PLACES
MK-370EXP SAFETY

5
If using an extension cord make sure it is in good condition first. When using an extension cord,
be sure to use one heavy enough to carry the current your product will draw. An undersized cord
will cause a drop in line voltage that will result in a loss of power and overheating. TABLE 1, Page
9 shows the correct AWG size to use depending on cord length and nameplate ampere rating. If in
doubt, use the next heavier gage. The smaller the gage number, the heavier the cord.
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 covering to
contain long hair.
Keep proper footing and balance at all times by not overreaching.
Clamps or a vise should be used to hold work whenever practical. Keeping your hands free
to operate a power tool is safer.
Keep tools clean for the best and safest performance. Always follow maintenance instructions
for lubricating, and when changing accessories.
Power tools should always be disconnected before servicing or when changing accessories,
such as blades, bits, cutters, and the like.
Make the workshops kid proof by using padlocks, master switches or by removing starter keys.
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.
MAKE THE WORKSHOP KID PROOF
DO NOT FORCE THE TOOL
USE THE RIGHT TOOL
USE THE PROPER EXTENSION CORD
USE PROPER APPAREL
ALWAYS wear approved eye protection.
ALWAYS wear approved respiratory protection.
ALWAYS place the power ON/OFF switch in the OFF position when the saw is not in use.
ON / OFF
SECURE WORK
DO NOT OVERREACH
MAINTAIN TOOLS WITH CARE
DISCONNECT TOOLS
MK-370EXP SAFETY

6
Consult the owner’s manual for recommended accessories. Using improper accessories may
increase the risk of personal or by-stander injury.
Serious injury could occur if a power tool is tipped, or if a cutting tool is unintentionally
contacted.
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 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 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.
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.
CALIFORNIA PROPOSITION 65 MESSAGE
USE RECOMMENDED ACCESSORIES
NEVER LEAVE A TOOL UNATTENDED
NEVER STAND ON THE TOOL
CHECK FOR DAMAGED PARTS
DIRECTION OF FEED
WARNING
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 and
• 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 filter out microscopic particles.
MK-370EXP SAFETY

7
Sawing and drilling generates 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). 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
HAZARD SYMBOLS
NEVER touch electrical wires or components while the engine is running. They can be
sources of electrical shock which could cause severe injury or burns.
Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never operate
the engine with covers, shrouds, or guards removed.
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.
((
)
)
on
DO NOT expose to rain or use in damp locations.
WARNING
ROTATING PARTS
ELECTRICAL SHOCK
OVER SPEED
DO NOT EXPOSE TO RAIN
MK-370EXP SAFETY

8
ELECTRICAL REQUIREMENTS AND GROUNDING INSTRUCTIONS
MK-370EXP SAFETY
In order to prevent potential electrical shock and injury, the following electrical safety precautions and sym-
bols should be followed at all times!
In case of a malfunction or breakdown, grounding provides a path of least resistance for electric current to
reduce the risk of electric shock. This tool is equipped with an electric cord having an equipment-grounding
conductor and a grounding plug. The plug must be plugged into a matching outlet that is properly installed and
grounded in accordance with all local codes and ordinances.
WARNING
• Do not modify the plug provided – if it will not t the outlet; have the proper outlet installed by a
qualied electrician
• Improper connections of the equipment-grounding conductor can result in a risk of electric shock. The
equipment-grounding conductor is the insulated conductor that has an outer surface that is green, with
or without yellow stripes. If repair or replacement of the electric cord or plug is necessary, do not
connect the equipment-grounding conductor to a live terminal
• Check with a qualied electrician or service personnel if the grounding instructions are not completely
understood, or if in doubt as to whether the tool is properly grounded
• Use only 3-wire extension cords that have 3-prong grounding plugs and 3-pole receptacles that accept
the tool’s plug
• Repair or replace a damaged or worn cord immediately
WARNING
This tool is intended for use on a circuit that has an outlet that looks like the one shown in Sketch A of
Figure 1. The tool has a grounding plug that looks like the plug illustrated in Sketch A of Figure 1. A tempo-
rary adapter, which looks like the adapter illustrated in sketches B and C, may be used to connect this plug to
a 2-pole receptacle as shown in Sketch B, if a properly grounded outlet is not available. The temporary adapter
should be used only until a properly grounded outlet can be installed by a qualied electrician. The green-
colored rigid ear, lug, and the like, extending from the adapter, must be connected to a permanent ground such
as a properly grounded outlet box.
NOTE: Use of a temporary adapter is not permitted in Canada.
'ROUNDING
-EANS
!
-ETAL3CREW
#OVEROF
'ROUNDED
/UTLET"OX
$
!$!04%2
# 'ROUNDING
0IN
'ROUNDING
0IN "
Fig. 1 Circuit and Adapter Information

9
Supporting
Surface
Power
Tool
Drip Loop
Power
Cord
Fig. 2 Drip Loop Information
To avoid the possibility of the appliance plug or receptacle getting wet, position the machine to one side of
a wall mounted receptacle. This will prevent water from dripping onto the receptacle or plug. A “drip loop,”
shown in Figure 2, should be arranged by the user to properly position the power cord relative to the power
source.
The “drip loop” is that part of the cord below the level of the receptacle, or the connector, if an extension
cord is used. This method of positioning the cord prevents the travel of water along the power cord and
coming in contact with the receptacle.
If the plug or receptacle gets wet, DO NOT unplug the cord. Disconnect the fuse or circuit breaker that
supplies power to the tool. Then unplug and examine for presence of water in the receptacle.
WARNING
Use only extensions cords that are intended for outdoor use. These extension cords are
identified by a marking “Acceptable for use with outdoor appliances; store indoors while
not in use." Use only extension cords having an electrical rating not less than the rating of
the product. Do not use damaged extension cords. Examine extension cords before using
and replace if damaged. Do not abuse extension cords and do not yank on any cord to
disconnect. Keep cords away from heat and sharp edges. Always disconnect the extension
cord from the receptacle before disconnection the product form the extension cord.
WARNING

10
Use of under size extension cords result in low voltage to the motor that can result in
motor burnout and premature failure. MK Diamond warns that equipment returned to
us showing signs of being run in a low voltage condition, through the use of undersized
extension cords will be repaired or replaced totally at the customers expense. There will
be no warranty claim.
To choose the proper extension cord,
• Locate the length of extension cord needed in TABLE 1 below.
• Once the proper length is found, move down the column to obtain the correct AWG
size required for that length of extension cord.
To reduce the risk of electrocution, keep all connections dry and off the ground. Do not
touch the plug with wet hands.
Table 1
WARNING
WARNING
MK-370EXP SAFETY
EXTENSION CORD MINIMUM GAGE FOR LENGTH
VOLTS TOTAL LENGTH OF CORD IN FEET
25 ft.
AWG
50 ft.
AWG
100 ft.
AWG
150 ft.
AWG
115v 14 12 Not Recommended Not Recommended
230v N/A 14 12 N/A

11
SAFETY LABEL LOCATIONS
Safety labels contain important safety information. Please read the information contained on each safety label.
These labels are considered a permanent part of your saw. If a label comes off or becomes hard to read,
contact MK Diamond or your dealer for a replacement.
Decal/Label Location Description
A Motor - Side Caution - Receptacle is for Water Pump Only
B Motor - Side Caution - Use with GFCI only
CMotor - Back Service/ Warranty
D Motor - Front Warning - Silica Warning
E Cutting Head – Top Warning - Read Owners Manual
F Motor - Front Notice - Voltage/extension cords
TILE SAW SPECIFIC WARNINGS
Wear eye protection.
Use splash guard for every operation for which it can be used.
Disconnect saw before servicing, when changing cutting blades, and cleaning.
Replace damaged cutting blade before operating.
WARNING
MK-370EXP SAFETY
Tile Saws
Receptacle is for
water pump only.
125V, .6 amps max.
!CAUTION
This saw is to be used
with a Ground Fault
Circuit Interrupter.
!CAUTION
Tile Master Label Sheet Part#166012
Label B
Label A
Label C
Label D
Label E
Label F
SERVICE OR
WARRANTY
FOR INFORMATION ON
PLEASE CALL
1-800-474-5594
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.
!
For Your Own Safety Read Instruction Manual
Before Operating Saw.
Wear Eye Protection.
Disconnect Saw Before Servicing, when Changing
Cutting Wheels and Cleaning.
Use Tool Only with Smooth Edge Cutting Wheels
Free of Openings and Grooves.
Replace Damaged Cutting Wheel Before Operating.
Do Not Fill Water Bath Above Water Fill Line.
See Manual for Pump Replacement.
!
WARNING
NOTICE
Most Motor Problems are caused by improper
voltage and extension cords. Cord should be
one-piece and short as possible. Cord
selection should match the following table.
1-2 H.P.
25’
50’
75’
100’
150’
250’
Max. Cord Length
Max. Cord Length
Max. Cord Length
No. 12 Wire
No. 10 Wire
No. 8 Wire
115v 230v
!
A
C
B
F
BE

12
PRODUCT SPECIFICATIONS
The MK-370EXP is a versatile Tile Saw. Operated and used according to this manual, the MK-370EXP
will provide years of dependable service.
GENERAL DESCRIPTION
MOTOR SPECIFICATIONS
BLADE CAPACITY
TILE TYPES
The MK-370EXP Tile Saw is engineered as a tabletop or stand mounted wet tile saw.The saw includes a
powerful 115V electric motor.The saw is capable of cutting tile up to twelve (12) inches in length. The saw
can cut an object one and three quarters (1-3/4) inches thick in one pass.
Motor specifications for the MK-370EXP are listed in Table 2 below.
Voltage 115v
Overall Amperage 7.4 A
Frequency 50/60Hz
RPM 6000 rpm
Horse Power 1-1/4 hp
The MK-370EXP uses a seven (7) inch (178mm) diameter, wet cutting continuous rim, MK Diamond blade
with a five-eighths (5/8) inch (15.875 mm) arbor.
The MK-370EXP can cut a variety of tile types including stone, masonry, and lapidary products.
NOTE: The MK-370EXP is not designed to cut plastic or metals.
MK-370EXP SAFETY
Table 2

03.2009
MK-370EXP TILE SAW
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 301
13
UNPACKING
Use proper lifting techniques when lifting the MK-370EXP
Remove the MK-370EXP and accessory box from the carton.
CONTENTS:
MK-370EXP
Cutting Surface
MK-370EXP
Cutting Head
Splash Guard Splash Guard
Wing Nut & Washer
Pump
Discharge Fitting
Cooling
Transfer Tube
Blade Nut
Wrench
Shaft
Wrench
Extended
Rip Guide
Electric
Water Pump
Flow
Adjusting Clamp
Pump
Manual
Warranty
Card
Owners
Manual
Diamond Blade
One (1) MK-370EXP cutting surface &
water pan
One (1) MK-370EXP cutting head
One (1) 7-inch wet cutting blade
One (1) splash guard
One (1) splash guard wing nut & washer
One (1) extended rip guide
One (1) electric water pump
One (1) pump discharge fitting
One (1) cooling transfer tube
One (1) Flow adjusting clamp
One (1) blade wrench
One (1) shaft wrench,
One (1) owners manual
One (1) pump manual
One (1) warranty card
CAUTION
MK-370EXP UNPACKING
OPTIONAL SIDE TABLE
You have the option of purchasing a Side Table (part# 160488) that can be attached to the Cutting
Table. The Side Table can be an aid in cutting larger tiles.
Side Table

14
(A)
Open the Stand
and place on flat surface
(C)
Align the Stand supports to
the depressions on the pan
(B)
Orient the Saw to the
Stand
(D)
Sit the Water Pan on top of
the Stand Supports
(E)
Verify that the saw is stable
in place
OPTIONAL STAND
1. The MK-370EXP weighs approximately thirty-three (33) pounds; use care when lifting.
2. Never lift the MK-370EXP with water in the Water Pan.
CAUTION
MK-370EXP UNIVERSAL STAND ASSEMBLY
TRANSPORT
The MK-370EXP is designed with a rigid frame and removable Cutting Head making the saw easily
transportable. To lift the saw, grasp the front and back of the frame at the lift points shown below.
Cutting
Head
Lift Point
Lift Point
1. The MK-370EXP weighs approximately thirty-three (33) pounds; use care when transporting.
2. Never transport the MK-370EXP with water in the Water Pan.
CAUTION
If a stand was not included with your saw, you have the option of purchasing one (part# 160131-MK)

(D)
Install the Height Adjusting Knob
through the Post into the Cutting
Head and tighten the Knob
15
Follow the assembly instructions to prepare your MK-370EXP for operation.
CUTTING HEAD INSTALLATION
(B)
Align Cutting Head Pivot
Hole to the Post, Pivot
Shaft
(A)
Place the Flat Washer onto
the Height Adjusting Knob
(C)
Verify the Cutting Head is
completely installed and
seated on the Post
(B)
Loosen the Blade Guard
Retaining Wing nut
(A)
Loosen and remove the
Blade Guard Retaining
Knob
(C)
Open the Blade Guard
DIAMOND BLADE INSTALLATION
NOTE: When installing the Retaining Screw, do not "cross-thread" and DO NOT over tighten the screw.
Flat Washer
MK-370EXP ASSEMBLY

16
(E)
Using the Blade and Shaft
Wrenches, loosen and
remove the Retaining Nut
and Outer Flange
(D)
Place the Shaft Wrench
between the Inner Blade
Guard and the Motor and
onto the Motor Shaft
(F)
Install Diamond Blade
onto Blade Shaft
(H)
Close the Blade Guard
(G)
Install the Retaining Nut
and Outer Flange and then
tighten using the Blade and
Shaft Wrenches
(I)
Verify the Blade is seated
on the Blade Shaft and
direction of rotation is
correct
(K)
Tighten the Blade Guard,
Retaining Knob
(J)
Tighten the Blade Guard
Retaining Wing nut
Motor Shaft Wrench
Motor Shaft Inner blade
Guard
Blade Wrench
Turn Counter-Clockwise
MK-370EXP ASSEMBLY

17
ADJUSTABLE CUTTING GUIDE INSTALLATION
NOTE: The Adjustable Cutting Guide can be used on either side of the Diamond Blade.
(A)
Loosen Adjustable Cutting Guide
retaining thumbscrew and place it
over the Movable Cutting Table,
Ruler/Stop
(B)
Place the Adjustable Cutting Guide
onto the Movable Cutting,Table
Ruler/Stop and tighten the retaining
thumbscrew
SPLASH GUARD INSTALLATION
WATER PUMP PREPARATION
(B)
Press one end of the Cooling
Transfer Tube onto the Water
Pump Discharge Fitting
(A)
Slide Cooling Flow Adjusting
Clamp onto the Cooling
Transfer Tube
(A)
Install the retaining thumbscrew
through the washer and Splash
Guard then align to the hole found
on back of the Blade Guard
(B)
Install the Splash Guard
onto the Blade Guard
MK-370EXP ASSEMBLY

18
PRE-START INSPECTION
Prior to beginning work, a pre-start inspection of the saw should be performed.
(B)
Verify the Movable Cutting
Table moves freely
(A)
Ensure the ON/OFF Switch
is in the OFF position
(C)
Inspect the Diamond Blade
for damage – verify the blade
is correct for the type of
material being cut
(E)
Inspect the MK-370EXP for
damage – ensure the cord
is free of cracks or cuts
(D)
Inspect the Pump Assembly
for damage – ensure the cord
is free of cracks or cuts
1. To prevent the possibility of electrical shock, the MK-370EXP MUST be de-
energized when connecting the Water Pump.
2. To prevent the possibility of electrical shock, use only MK Diamond authorized
replacement parts.
NOTE: To prevent pump damage, the Water Pump must be disconnected if cutting dry.
CONNECTING THE WATER PUMP
(C)
Connect the Water Pump
power cord to the connection
found on the back of the motor
(A)
Loosen the cutting head
pivot retaining knob and tilt
cutting head to 45°
WARNING
MK-370EXP SETUP
(B)
Connect the Cooling Transfer
Tube to the inlet connection
on the Blade Guard

EXTERNAL WATER SOURCE
This is the preferred method of cooling.
19
WATER PUMP SETUP FOR OPERATION
The Water Pump can be setup for operation in two ways: External Water Source or Re-circulation.
RE-CIRCULATION
NOTE: When using the re-circulation method, the water should be changed often for longer pump life
(A)
Ensure that Cooling
Transfer Tube is connected
(D)
Fill the Water Pan until
water completely covers
the Water Pump suction
(B)
Place the Water Pump
toward the back of the
Water Pan
MK-370EXP SETUP
(C)
Position pump as shown
and place the pump
electrical cord and cooling
transfer tube under the
frame.
NOTE: If cutting dry DO NOT connect the water pump.
1. Verify or remove the Drain Plug from the Water Pan.
2. Place the Water Pump in an external container.
3. Fill the external container until water completely covers the Water Pump suction inlet.
4. Place an external catch basin below the Water Pan drain hole.

20
SETUP FOR OPERATION
1. Before powering or starting, check for damage that could prevent this
equipment from proper operation or performing it’s intended function. Check
for binding and alignment of moving parts. Check for damaged, broken, or missing
parts.
2. Verify the On/Off switch is in the OFF position.
3. Before connecting the MK-370EXP to a power supply, be sure the voltage,
cycle and phase of the job site power source meet the requirements of TABLE 3
4. Use an approved Ground Fault Circuit Interrupter (GFCI)
5. Do not cover the motor vents as this could lead to motor overheating.
VOLTAGE 115v
CYCLE 60Hz
PHASE 1-phase
Table 3
1. In order to avoid breaker tripping, a 20 amp circuit breaker should be used.
2. If using an extension power cord, make sure the length and wire gauge correspond to the
requirements listed in TABLE 1 on page 10. An extension power cord that is too small in
wire gauge (diameter), or too long in length, will cause the motor to overheat and could
cause premature failure.
NOTE:
(A)
Ensure the ON/OFF Switch
is in the OFF position
(C)
Plug the GFCI into the
Power source
(B)
Plug MK-370EXP into the
GFCI
GFCI
CAUTION
MK-370EXP SETUP