Nitto Kohki MYTON MYS-40L User manual

Professional tool Pneumatic sander
Model: MYS-40/MYS-40L
 The end tool in the drawing is not included with the tool.
[Specifications]
Model MYS-40/MYS-40L
Maximum operating pressure MPa 0.6
Air consumption (No load) m3/min 0.45
Rated speed (No load) min-1 13700
Abrasive Disc (paper) diameter mm 100
Mass (weight) kg 1.1
Sound pressure level *1 dB (A) 82
Sound power level *1 dB (A) 93
Vibration level *2 m/s2≤2.5
*1 Based on the ISO15744 measurement standard.
*2 Based on the 3 axes combined value measurement standard of the
ISO28927-3 of the hand-held tool frequency correction vibration
acceleration effective value.
Japan Use Only
 Please read manual carefully before you attempt to use your tool so that you may use it properly
and safety.
 Keep the manual handy - so you can use it whenever necessary.
• Due to continuous product development/improvement, the specifications and configurations in this
document are subject to change without prior notice.
INSTRUCTION
MANUAL
Manufactured by.
NITTO KOHKI CO., LTD. 9-4, Nakaikegami 2-chome, Ohta-ku, Tokyo, 146-8555, Japan
Tel : [phone] Fax : [phone]
TQ15301-0 05/2017

EN
Contents
Precautions on Use (Make sure to follow the
instructions given)................................................. 1
General Power Tool Safety Warnings ...................1
General Pneumatic Tool Safety Warnings ............4
Product Specific Safety Rules...............................5
1 Application ......................................................... 6
2 Checking Inside the Package............................ 6
3 Part Names........................................................ 6
MYS-40.................................................................6
MYS-40L...............................................................7
4 Air Supply .......................................................... 8
5 Preparation........................................................ 9
Replacing the Abrasive Disc .................................9
Start and stop (MYS-40) .....................................10
Start and stop (MYS-40L) ...................................10
Adjusting the rotation speed (MYS-40L).............11
6 How to Use...................................................... 11
Grinding work......................................................11
7 Maintenance and Inspection............................ 12
Storing the tool....................................................12
Maintenance and Inspection...............................12
Disposal ..............................................................13
California Proposition 65
WARNING
Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains
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.
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.
Instructions
Thank you very much for your purchase of this Nitto Kohki product.
Before using your tool, please read this manual carefully so that you may use it properly to get the most out of it.
Please keep the manual handy - so you can use it whenever necessary.
The following Safety notations are used throughout the manual to highlight safety precautions for the user and for the
tool.
WARNING: Indicates a potentially hazardous situation which, if not avoided by following the
instructions given, could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation which, if not avoided by following the
instructions given, could result in injury or material damage.
* Please note, however, that failure to observe safety precautions under the “ CAUTION” category could result in
a serious occurrence depending on the situation.
Please observe all safety precautions in the manual.
CAUTION: Important precautions for tool setup, operation and maintenance.
About pictograms
WARNING: It might be dangerous to operate the tool if the instructions supplied are not followed.
Using this tool improperly could result in serious injury. Read the instruction manual before
use.

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Precautions on Use (Make sure to follow the instructions given)
Before using your tool, to avoid personal injury always take the basic precautions explained in later sections.
General Power Tool Safety Warnings
Personal safety
WARNING
 Dress properly.
Do not wear loose clothing or jewelry. There is a
danger of being caught in moving parts. Wear a
pair of non-slip shoes. If your hair is long, wear a
protective hair covering to contain your hair.
 Always wear eye protection.
Corrective glasses are not considered eye
protection. Always wear appropriate eye
protection.
 Wear a dust mask.
When dust is generated in the workplace, wear a
dust mask.
 Use a dust collector or dust collection
equipment correctly.
If a dust collector or dust collection equipment
are being used, check that these are connected
and used properly. Use of a dust collector can
reduce risk caused by dust.
 When loud noise is generated in the workplace,
wear a hearing protection.
 Do not overreach.
Keep proper footing and balance at all times.
 Be on your guard when working.
Do not use the tool when you are tired.
When you use the tool, be sure about the handling method, how to work, and pay sufficient attention to the
surrounding environment.
 Never touch the tip of moving parts when the tool is running.
Also, do not direct the tip of moving parts toward people or animals.
 Be aware of tool vibration and recoil. Some tools can cause a considerable amount of vibration.
Depending on how the product is operated, the type of tool setting, and the length of operation, it could place a
tremendous burden on your hands, arms and body.
The tool could cause a vibration injury or tendonitis. Avoid long-term use and take appropriate breaks.
Consult a doctor if you experience any discomfort or pain while operating the tool.
Protective hair
covering
Dust mask
Work clothes
Safety shoes
Protective
goggles
Earplugs

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Work area safety
WARNING
 Do not use the tool at home.
This is a professional tool (industrial or work tool for business). Do not bring the tool home and use it there.
 Keep the work area clean.
Working in a messy work area or work table could cause an accident.
 Be cautious about the work area.
Do not expose the tool to rain.
Do not use the tool in a damp or wet place.
Keep the work area well lit.
 Do not operate the tool in an explosive atmosphere, such as in the
presence of flammable liquids (thinner, lacquer, gasoline, etc.) or
gas.
 Do not let children come close to the work area.
Keep children and bystanders away while operating tool.
 Some tools generate loud noise.
Check that the noise regulations of each area are complied with.
 When work has to be done in high locations, make sure there is
nobody underneath the work area.
If the tool or material is dropped, it could cause an accident or
injury.
 Before starting operation, make sure that there is no conduit,
water pipe or gas pipe by your work area.
If a tool touches a buried object, it could cause electrical shock or leakage, which could cause an accident.
Before starting to work
WARNING
 Perform inspection before using the tool.
Before using the tool, check for loose screws on the tool and for damage on the protective cover or other parts,
and make sure that the tool operates normally and demonstrates prescribed functions.
Check the position adjustment and tightening status of moving parts, parts damage, attachment status, and all
other locations for issues that could affect operation.
For parts replacement and repair, follow the instructions indicated in the instruction manual.
If there are no instructions in the instruction manual, contact the retailer where you purchased the tool or the
nearest NITTO service member store.
Do not use the power tool if the switch does not turn it ON and OFF.
 Make sure to properly attach the tip tool.
If the tip tool is not attached properly, there is a risk of jumping out or damage, which could result in injury.
 After adjustment, be sure to remove tools such as spanners, wrenches, etc.
 Use appropriate tools.
Do not force small tools to do the job of a heavy duty tool. Do not use tools for purposes not intended.
 Do not use tools in an unreasonable manner.
When the specifications are followed, tools can be used efficiently and safely.
 Secure workpieces.
Where possible use clamps or a vise to hold the work. It is safe to hold the workpieces by hand and both hands
can be used for operation.
Precautions on use

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Handling tools
WARNING
 Storing the tool
When the tool is not used, store the tool in a dry location. Also, store the tool out of the reach of children.
For some tools, the storage temperature and humidity are specified. Store the tool in an appropriate location.
 Be cautious about how the tool is carried.
Do not carry the tool with your hand touching the operation switch.
 Do not leave the tool while the tool is still running.
Do not leave the work area until you turn off the operating switch, remove the power source and the tool
completely stops.
 Do not allow the following chemicals to come into contact with the tool, as parts could deteriorate.
Acetone, benzine, thinner, ketone, ether, trichlorethylene and other similar chemicals
Maintenance and Inspection
WARNING
 Do not disassemble or alter the tool.
Using the tool after disassembling or remodeling it could cause an accident or injury.
 Inspect tip tools and accessories.
Always inspect tip tools and accessories for damage or deterioration before attaching them to the tool.
If damage or deterioration is found, request repair from the retailer where you purchased the tool or the nearest
NITTO service member store.
 Inspect for damaged sections.
Sufficiently check for damage on accessories or other parts, that the tool operates normally, and that work can
be performed appropriately.
If there are accessories or parts that have been damaged or could hinder work, request repair from the retailer
where you purchased the tool or the nearest NITTO service member store.
 Request repair from a dedicated store.
For repair or replacement of parts, request service from the retailer where you purchased the tool or the nearest
NITTO service member store.
Repair requires special knowledge and skills. If repair is performed at a place other than a specialty store, the
tool may not demonstrate its full performance or it could lead to an accident or injury.
Request repair with the failed status kept intact. When requesting a repair, do not throw away damaged parts. It
could be important information for investigating the failure cause so do not change the status.
 Use genuine parts.
If inappropriate parts are used, it could cause accident or injury.
Genuine parts are listed in the instruction manual or brochure. Inquire at the retailer where you purchased the
tool or the nearest NITTO service member store.
 Do not remove the labels or plates on the tools.
If labels or plates are broken or peeling, for a replacement label or plate contact the retailer where you purchased
the tool or the nearest NITTO service member store.

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General Pneumatic Tool Safety Warnings
WARNING
 Use the tool with proper air pressure.
If the air pressure is high, the rotation speed and reciprocation frequency become faster, causing damage such
as damage or accelerated wear. Also, unexpected accidents could occur.
 Connect the tool to air piping.
In some factories, other than air piping, there may be other piping such as oxygen, nitrogen, gas, etc. Before
connecting to piping, make sure it is the correct piping.
 Do not start the tool carelessly.
Turn off the operation switch, then attach the Connecting Hose to the tool.
 When attaching, removing, and maintaining accessories, make sure to detach the Connecting Hose from the
tool.
 Be cautious about exhaust.
Pneumatic tool exhaust contains oil and drainage, etc. Be careful about the exhaust direction so that the exhaust
does not directly hit people nearby.
 Do not allow sources of electricity to touch the tool.
The pneumatic tool is not insulated against contact by electric sources. Because there is a risk of electric shock,
do not allow sources of electricity to touch the tool.
CAUTION
 Handle the tool with care.
Rough handling could cause accidents or malfunctions. Do not exert an impact on the tool by throwing or
dropping it.
 Handle the Connecting Hose with care.
Do not carry the tool by holding the Connecting Hose, and do not pull the Connecting Hose to remove it.
Precautions on use

5
EN
Product Specific Safety Rules
WARNING
 Use an Abrasive Disc having the mounting hole diameter of 16 mm and external dimension of 100 mm (4").
 Do not use Abrasive Discs with the allowable rotation speed (written on the Abrasive Disk, Pad, or package
box) lower than the actual rotation speed of the tool.
 When mounting the Abrasive Disc or Pad, carefully check for cracks and chips.
Do not use Abrasive Discs or Pads that are damaged such as cracks or chips. Also, do not use Abrasive Discs
soaked in liquid such as water.
 When mounting a new Abrasive Disc, place this tool under an iron workbench or in a cast and operate it for 1
minute or more.
At this time, make sure there are no people above the rotating surface of the Abrasive Disc.
If the Abrasive Disc is defective, or in case of improper mounting or wrong dimensions or rotation speed, the
Abrasive Disc may come off and it is extremely dangerous.
 When starting to use this tool, make sure that the rotation speed at 0.6 MPa (6 kgf/cm2) does not exceed the
rotation speed indicated on the label or the tool.
 This tool is dedicated to Abrasive Disc.
Never use Grinding Wheel.
 Always work at the correct angle of 15 to 30 degrees.
15 to 30°
Use surface

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1 Application
This tool is a pneumatic hand-held sander for polishing/grinding steel materials, etc. using the Abrasive Disc.
2 Checking Inside the Package
When you open the package box, check the contents of the package and also check for any damage that may have
occurred during transportation.
If an abnormality is found, request service from the retailer where you purchased the tool or the nearest NITTO service
member store.
Package content and accessories Quantity Check
1MYS-40/MYS-40L (main unit) 1
2Back-up Pad 1
35 mm Hex. Socket Screw Key 1
46 mm Hex. Socket Screw Key 1
Package content and accessories Quantity Check
5Instruction Manual (this document) 1
6General Catalog 1
7Caution for Use 1
8Questionnaire Postcard 1
1234
3 Part Names
MYS-40
1
2
3
4
5
6
7
1Spindle Lock Button
2Grip Tube
3Valve Ring
4Coupler
5Wheel Guard
6Driving Flange
7Outer Flange

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MYS-40L
1
2
3
4
7
8
5
6
9
1Spindle Lock Button
2Grip Tube
3Adjust Valve
4Coupler
5Lock Lever
6Throttle Lever
7Wheel Guard
8Driving Flange
9Outer Flange

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4 Air Supply
CAUTION
 Remove drainage before stating work.
When drainage enters the tool, the vicinity of the exhaust port freezes, which could cause a loss of power.
1
2
3
4
5
6
7
8
1Compressor
2Air Filter
3Air Regulator
4Lubricator
5Connecting Hose
6Machine Oil
7Coupler
8Tool
Air pressure used
Use the tool with air pressure at 0.6 MPa. If the pressure is too low, the tool cannot demonstrate the required
performance. If it is too high, it could damage parts of the tool. Use an Air Regulator (3) to adjust the pressure to the
appropriate level.
Air line
Use a Connecting Hose (5) with an internal diameter of 9.5 mm (3/8”) between the Compressor (1) and the tool
(8). Compressed air exits the Compressor and cools and moisture condenses. Some moisture could condense
inside the Connecting Hose and get inside the tool, causing a malfunction. Install the Air Filter (2) and Lubricator (4)
between the Compressor and the tool.
Machine oil
Install a Lubricator between the Compressor and the tool, and be sure to use machine oil (ISO VG-10).
Failure to do so could cause damage to the tool. Also, if lubricating oil with high viscosity is used, it could cause
performance degradation.
Refueling
Each day before starting work detach the Connecting Hose and refill a few drops of machine oil (ISO VG-10) (6) from
the Coupler (7) to the tool.
After refueling, connect the Connecting Hose and perform idle operation for a few seconds to allow the oil to blend in
the entire tool.

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5 Preparation
WARNING
 During work, be sure to wear eye protection, earplugs, a dust mask, and gloves (other than knitted gloves).
 When replacing or adjusting the Abrasive Disc or parts, be sure to detach the Connecting Hose from the tool.
 Never touch moving parts while the tool is running.
 After stopping work, the tip of the grinding tool will continue to rotate for a while.
Never touch moving parts until the tool completely stops.
Replacing the Abrasive Disc
WARNING
 Before replacing the Abrasive Disc, always turn OFF the Valve Ring or Throttle Lever and detach the
Connecting Hose from the tool.
Attaching
1 Insert the Outer Flange (6) to the Back-up Pad
(4) and Abrasive Disc (5)
2 While holding the Spindle Lock Button (1),
turn the Driving Flange (3) by hand, and push
the Button at the position where rotation stops
3 Align the notched part of the Disc Lock (6)
with the key, and attach the Back-up Pad (4)
and the Abrasive Disc (5) together
4 Using a 6 mm Hex Socket Screw Key (8),
tighten the Outer Flange Bolt (7) to the
Spindle (2)
When you release your hand from the Spindle Lock
Button (1), the lock is released automatically.
1
2
3
4
5
6
7
8
Removing
1 While holding the Spindle Lock Button (1),
turn the Abrasive Disc (5) by hand, and push
the Button at the position where rotation stops
2 Using a 6 mm Hex Socket Screw Key (8),
loosen the Outer Flange bolt (7)
Now the Abrasive Disc can be removed.
3 Remove the Back-up Pad (4) and Abrasive
Disc (5)

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Start and stop (MYS-40)
Start
1 Make sure that the Valve Ring (1) is in the
position where the green line (2) is visible
When the green line (2) is visible, it indicates that
the Valve Ring is OFF.
1
2
2 Attach the Connecting Hose to the tool, then
turn the Valve Ring counterclockwise (4)
while pushing the Valve Ring in the direction
of 3
The tool starts.
3
4
Stop
1 Turn the Valve Ring clockwise
The tool stops.
Start and stop (MYS-40L)
Start
1 Check that the Throttle Lever is in the OFF
status and insert the Connecting Hose into the
Coupler of this tool
2 Hold the tool by hand and while pulling the
Lock Lever (1) toward you, press the Throttle
Lever
The tool starts.
1
Throttle Lever
Lock Lever
Stop
1 Release your hand from the Throttle Lever
The Throttle Lever automatically returns to the OFF
status.
Preparation

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Adjusting the rotation speed (MYS-40L)
WARNING
 Never touch the tip of moving parts.
1 Use a flathead screwdriver to turn the Adjust
Valve
The air flow rate changed that allows the rotation
speed to be adjusted.
The maximum rotational position is when the
screwdriver groove of the Valve coincides with the
axis center of the main unit. Adjust the position
according to the purpose of use.
Close
Full open
6 How to Use
Grinding work
CAUTION
 Do not press the Abrasive Disc strongly against the working surface.
Doing so could damage parts or damage the Abrasive Disc. Strongly pressing the tool against the working
surface does not change work efficiency.
1 Hold the tool with your hand to start
2 Lightly touch the Abrasive Disc at an angle of 15 to 30
degrees against the working surface
15 to 30°

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7 Maintenance and Inspection
Storing the tool
Store the tool according to the following warnings and cautions.
WARNING
 When the tool is not in use, store out of the reach of children.
CAUTION
 When the tool is not in use, store in a place with little humidity.
 After completing work, lubricate with machine oil (ISO VG-10) from the Coupler of the tool and operate a little
before storing.
If the tool is left as is after use, moisture in the air could remain inside the main unit, likely causing rust to occur.
Maintenance and Inspection
WARNING
 For maintenance and inspection, be sure to detach the Connecting Hose from the tool.
 Use genuine parts.
 Never touch moving parts while the tool is running.
Replenishing grease
Apply grease (Sumitec 305) as needed to the inside of the main unit about once a month according to the following
procedure.
At that time, use an air blower or the like to remove dirt adhering to the Muffler. Also, depending on dirt conditions,
replace the Muffler as needed. If dirt adheres to the Muffler, it could cause a loss of power.

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1 Loosen the + Countersunk Head Screw
(1) of the Exhaust Cover and remove the
Exhaust Cover (2), Muffler (4), Spacer (3),
and Packing Cover (5)5
4
3
2
1
4
1+ Countersunk Head Screw 4×14
2Exhaust Cover
3Spacer
4Muffler
5Packing Cover
2 Use a grease gun to inject grease (Sumitec
305) into the grease inlet (6)
Use a grease gun nozzle with a tip outer diameter
of less than 3 mm.
The nozzle for a grease nipple cannot be used for
injection.
6
3 Perform a trial run and wipe off extra grease that seeps out
Attach a Connecting Hose to the Coupler of the tool and operate the tool.
At that time, grease may scatter from the exhaust part and grease inlet, so operate the tool after confirming that
there are no objects around the tool.
Stop the tool in a few seconds and always detach the tool from the Connecting Hose, then wipe off any grease
that seeps from the periphery of the Spindle.
4 Assembling the Exhaust Cover
Assemble the Exhaust Cover by performing the disassembly procedure in reverse.
Insert the Muffler under the Packing Cover so that there is no clearance in the Housing.
Disposal
 Separate the tool, accessories, and packing materials for environmentally-friendly recycling.
 When disposing of the tool, follow the rules of each municipality.