MK Diamond Products MK-SDG-7 User manual

06.2011
MK-SDG-7
OWNERS MANUAL,
PARTS LIST &
EXPLODED VIEW
www.mkdiamond.com
MK Diamond Products, Inc.
Revision 102
Manual Part# 168146
Caution: Read all safety and operating instructions
before using this equipment. This manual MUST
accompany the equipment at all times.

2
INTRODUCTION
Congratulations on your purchase of a MK-SDG-7. 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-SDG-7 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-SDG-7 safely and correctly. Please take the time to familiarize
yourself with the MK-SDG-7 by reading and reviewing this manual.
Read and follow all safety, operating and maintenance instructions.
If you should have questions concerning your MK-SDG-7, 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 and mail it in as
soon as possible.

3
TABLE OF CONTENTS
SAFETY
Safety Messages 4
California Proposition 65 Message 5
General Safety 6
Electrical Requirements and Grounding Requirements 6-8
Safety Label Locations 9
Product Specications and Features 10
ASSEMBLY
Assembly 11
Replace Cup Wheel 11
EXPLODED VIEW and PART LISTS
Exploded View 12
Parts List 13
ACCESSORIES ORDERING and RETURN INSTRUCTIONS
Accessories 14
Ordering Information 15
Return Material Policy 15
Packaging Instructions 15
Authorized Service Centers 15

4
MK-SDG-7 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.
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.
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 unit should always be shutdown before servicing or when changing accessories such as blades,
bits, cutters, and the like.
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.
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.

5
MK-SDG-7 SAFETY
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.
Use appropriate NIOSH-approved respiratory protection where dust hazard may occur. Paper masks
or surgical masks without a NIOSH approval number are not recommended because they do little to
protect the worker. For more information about respirator programs, including what respirators have
received NIOSH approval as safe and effective, please visit the NIOSH website at:
http://www.cdc.gov/niosh/npptl/topics/respirators
Observe OSHA regulations for respirator use (29 C.F.R.§1910.134 and §1503.1).
Visit http://www.osha.gov for more information.
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.
SILICA DUST WARNING
CALIFORNIA PROPOSITION 65 MESSAGE

6
In case of a malfunction or breakdown, grounding provides a path of least resistance for electric cur-
rent to reduce the risk of electric shock. This tool is equipped with an electric cord having an equip-
ment-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.
MK-SDG-7 SAFETY
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.
• NEVER leave the machine unattended. Turn off electric motor when unattended.
ON / OFF
Caution must be observed while servicing the machine. Rotating parts can cause
injury if contacted.
ELECTRICAL REQUIREMENTS AND GROUNDING INSTRUCTIONS
WARNING In order to prevent potential electrical shock and injury, the following electrical
safety precautions and symbols should be followed at all times!
• NEVER operate the machine in an explosive atmosphere.
Failure to follow instructions in this manual may lead to serious injury. This equipment is to be oper-
ated by trained and qualied personnel only. The following safety guidelines should always be used
when operating the MK-SDG-7.
DANGER
RULES FOR SAFE OPERATION
CAUTION

7
MK-SDG-7 SAFETY
• 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.
The tool has a grounding plug that looks like the plug illustrated in Sketch A. A temporary 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 electri-
cian. 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.
Grounding
Means
(A)
Metal Screw
Cover of
Grounded
Outlet Box
(D)
ADAPTER
(C) Grounding
Pin
Grounding
Pin (B)
Circuit and Adapter Information

8
MK-SDG-7 SAFETY
To reduce the risk of electrocution, keep all connections dry and off the ground. A Ground Fault Cir-
cuit Interrupter (GFCI) should be provided on the circuit(s) or outlet(s) to be used for this machine.
Receptacles are available having built-in GFCI protections and may be used for this measure of
safety. When using an extension cord, the GFCI should be installed closest to the power source, fol-
lowed by the extension cord and lastly, the machine.
WARNING
Do Not use in wet conditions
DANGER
WARNING
Use only extensions cords that are intended for outdoor use. These extension cords are identied by
a marking “Acceptable for use with outdoor appliances; store indoors while not in use.” Use only ex-
tension 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
from the extension cord.
WARNING
To reduce the risk of electrocution, keep all connections dry and off the ground. Do not touch the
plug with wet hands.
WARNING
• Locate the length of extension cord needed in table provided.
• Once the proper length is found, move down the column to obtain the correct AWG size required
for that length of extension cord. For example, a fty foot extension cord would require an AWG
size of 14 for a 120V volt circuit.
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
120V N/A 14 12 N/A
Use of undersize 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,

9
DANGER
Do NOT use in
wet conditions
!
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 Lgth.
Max. Cord Lgth.
Max. Cord Lgth.
Max. Cord Lgth.
No. 12 Wire
No. 10 Wire
No. 8 Wire
No. 6 Wire
115v 230v
5 H.P.
230v
50’
100’
150’
250’
NOTICE
!
CAUTION
Keep
hands and
feet clear.
!
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.
!
The MK-SDG-7 is equipped with a number of safety decals provided for operator safety and mainte-
nance information. Should any of these decals become unreadable, replacements can be obtained by
calling [phone].
MK-SDG-7 Safety Decal Sheet, Part No. 168145
OPERATION & SAFETY DECALS
Decal A
MK-SDG-7 SAFETY
SAFETY DECAL LOCATIONS
Decal Location Description
A IXL Shroud Warning - Silica
B Starter Switch Notice - Cord
C Weight Caution - Keep Hands clear
D Starter Switch Danger - Wet Conditions
MK-SDG-7 Safety Decal Locations
Decal C
Decal D
Decal B
Decal A
Decal B
Decal C Decal D

10
• 120V/15 Amp motor, disc RPM of 3,500
• Constructed with sturdy heavy gauge steel
• MK-IXL vacuum shroud for dust control
• Shroud accommodates diamond cup wheels up to 7" in diameter
• Attaches to traditional shop vacuum, reducing risk of respiratory problems
• Lightweight portable size for use in small areas
• Adjustable handlebar for operator comfort
• Removable handlebars make it easy to store and to transport
• Easy to maneuver by one person
• Levels uneven surfaces and quickly removes epoxies and thin coatings
FEATURES
MK-SDG-7 FEATURES & PRODUCT SPECIFICATIONS
PRODUCT SPECIFICATIONS
Model MK-SDG-7
Disc RPM 3500
Disc Capacity 7" (178 mm)
LxWxH (inches) 34.6" x 17.5" x 32"
LxWxH (mm) 879 x 445 x 813
Weight 44 lbs. (18.6 kg)
Part # 166859
Perfect for small jobs, the MK SDG-7 is designed to grind concrete surfaces to a smooth nish. Dura-
bly built with heavy gauge steel it is still lightweight and portable and the removable handle bar makes
it easy to transport. The dust control system is ready to hook-up to any vacuum system for dustless
grinding. Comes with the MK IXL dust shroud and a 7" cup wheel.
DANGER Do Not Use in Wet Conditions

11
MK-SDG-7 ASSEMBLY
Place the handle bar
assembly into the base and
screw the tri knob in to hold
it in place
Attach the vacuum hose
from a vacuum to the
vacuum outlet port
Plug in grinder and flip the
power switch. Its ready to
grind
Check the shroud and cup
wheel are free of obstruction
Use a 15/16 wrench on the cup wheel bolt, and a 1” wrench on the
hex shaft. Place the 1” wrench between the cup wheel and the dust
shroud, as shown, until the wrench (open end) goes over the hex
shaft. Hold the shaft in place and use the 15/16 wrench to break
the bolt free. Once it is broken free you can turn the bolt by hand
until it comes off with the cup wheel. Replace with new cup wheel
and tighten bolt. Use wrenches to make sure the bolt is tight, before
grinding.
ASSEMBLY
INSTALLING/REPLACING CUP WHEEL

12
MK-SDG-7 EXPLODED VIEW

13
MK-SDG-7 PARTS LIST
ITEM DESCRIPTION QTY PART #
1 WHEEL, FRONT 5" X 2" W CONCSAW 2 138537
2 GRIP, HANDLE, 3/4 X 4-3/4 2 139949
3 NUT, 1/4 - 20 HEX 1 151893
4 CLAMP, 3/4 CUSHION LOOP 1 152594
5 SCREW, 1/4 -20 X 1/2 HEX HEAD 1 152608
6 COLLAR, SET, 3/4" 2 153814
7 MK-304CGI 7" CUP WHEEL 1 155446
8 SCREW, FLAT HEAD, 1/4 - 20 X 1/2 PHIL 2 155812
9KNOB, TRI 1 156770-04
10 FILTER, MOTOR 1 157729
11 MTR, 115V, 15A, AC 1 157801-C
12 CAP, MOTOR 1 157877
13 SPACER, NYLON 1 157878
14 SPACE, CAP SCREW 2 157879
15 SCREW, #8 X 1-1/2 FLAT HD PHIL 2 158157
16 SCREW, HEX HEAD CAP, M6 X 1 X 20MM 6 158158
17 WASHER, FLAT, 5/8 SAE 1 158350
18 WASHER, FLAT M6 6 160215
19 CLAMP-DUST SHROUD 1 166407
20 VACUUM HOSE 2" X 37" LG. 1 166536
21 DUST SHROUD ASSEMBLY 1 166649
22 SWITCH ASSEMBLY 1 166858
23 BASE WELDMENT 1 166860
24 HANDLE BAR WELDMENT 1 166861
25 SHAFT ADAPTOR 1 166863
26 SCREW, HHCS 5/8 - 11 X 3/4 1 167177
27 SCREW, SET M10 X 1.5 X 30MM 1 167179
28 WEIGHT, GRINDER 1 167434
29 SPLIT LOOM 5/8" 1 167662

14
Single Row Grinding Cup Wheels Double Row Grinding Cup Wheels
MK-304CG-1
• 12 segment cup wheel
• 6mm diamond depth height
• 600-800 sq. ft. area
• For concrete deburring &
rough surface grinding
MK-304SG-2
• 24 segment cup wheel
• 6mm diamond depth height
• 800-1200 sq. ft. area
• For concrete deburring &
rough surface grinding
Turbo Cup Wheels PCD Cup Wheels
MK-504CG-1
• 12 segment cup wheel
• 6mm diamond depth height
• 1800-2400 sq. ft. area
• For fast surface grinding
MK-604CG-1
• 12 segment cup wheel
• 800-1000 sq. ft. area
• For epoxy/paint removal
MK-504SG-2
• 24 segment cup wheel
• 6mm diamond depth height
• 2400-3000 sq. ft. area
• For fast surface grinding
MK-604SG-2
• 18 segment cup wheel
• 1400-1800 sq. ft. area
• For epoxy/paint removal
T-Segment Cup Wheel Bi-Turbo Cup Wheel
T- Segment
• 14 segment cup wheel
• 6mm diamond depth height
• 1800-2400 sq. ft. area
• For smooth surface grinding
MK-704SG-2
• 18 segment cup wheel
• 6mm diamond depth height
• 5000-8000 sq. ft. area
• For high efficiency surface
grinding
MK-SDG-7 ACCESSORIES
Recommended 7" Cup Wheels For A Variety Of Applications
Part# 155446
Part# 158734
Part# 158736
Part# 166380
Part# 155447
Part# 162789
Part# 162792
Part# 167115
ACCESSORIES
Part# 166964
MK-IXL HINGED SHROUD
 • 8GritRough,aggressiveremovalofheavycoatingsPart # 167836
 • 16GritHeavy-dutyremovalofmastic,epoxyandurethanecoatingsPart # 167837
 • 24GritLightscuffingandcleaningwithminimalremovalPart # 167838
 • 36GritLightscuffingandcleaningwithminimalremovalPart # 167839
 • Single Disc Grinder Adapter Part # 169216 is required for Zek Disc
Four grits are offered for different coating removal applications:
7" 5-PACK Bulk SAWTEC-ZEK Abrasive Grinding Disks
GrindingDisksforremovingmastic,epoxyandurethanecoatings.
Fivedisk,bulkpacks.7/8"Arbor
•Useforgrindingagainstwallsandedges

15
MK-SDG-7 ORDERING, RETURN, PACKING, & AUTHORIZED SERVICE
ORDERING INFORMATION
You may order MK Diamond products through your local MK Diamond distributor or, you may order
direct from MK Diamond.
NOTE: There is a $25.00 minimum order when ordering direct from MK Diamond. All purchases
must be made using VISA, MasterCard or American Express.
When ordering direct from MK Diamond, please have the following information ready before calling:
• The Model Number of the unit
• The Serial Number of the unit
• Where the unit was purchased and when
• The Part Number for the part(s) being ordered
• The Part Description for the part(s) being ordered
All parts may be ordered by calling toll free to – 800 421-5830 or 310 539-5221 and asking for
Customer Service. For technical questions, call – 800 474-5594.
RETURN MATERIALS POLICY
To expedite the service relative to the return of a product purchased through MK Diamond,
please observe the following:
NOTE: When returning all items, they must have been purchased within the previous twelve
(12) months.
• Have the Model Number of the unit
• Have the Serial Number of the unit
• Have the location of where the unit was purchased
• Have the date when the unit was purchased
• Contact Customer Service for approval to return the item(s)
• Obtain a Returned Goods Number (RGA) authorizing the return
• Follow the packaging instructions in the following section
• Ensure your item(s) are prepaid to the destination
For returned items, call toll free to – 800 421-5830 or 310 539-5221 and ask for Customer
Service. For technical questions, call – 800 474-5594 or 310 257-2845.
PACKAGING INSTRUCTIONS
• Dry the unit before shipping
• Package the unit in its original container or one of comparable size (do not ship the unit partially
exposed)
• Ensure all parts are secured in the packaging to prevent movement.
AUTHORIZED SERVICE CENTERS
For quicker repair time, you may contact MK Diamond Customer Service, toll free, at 800 421-5830
or 310 539-5221 for the Authorized Service Center closest too you or visit our web site at www.
mkdiamond.com. For technical questions, call – 800 474-5594.

MK Diamond Products, Inc.
1315 Storm Parkway
Torrance, CA 90501
Toll-Free: [phone]
Phone: [phone]
Fax: [phone]
www.mkdiamond.com
MK-SDG-7
OWNERS MANUAL, PARTS LIST, EXPLODED
& OPERATING INSTRUCTIONS