Nitto Kohki A-300 User manual

Due to continuous product development/improvement the specifications and configurations in this
document are subject to change without prior notice.
Manufactured by :
NITTO KOHKI Co., Ltd.
2-9-4, Nakaikegami, Ohta-ku,
Tokyo, 146-8555, Japan
TEL : [phone]
FAX : [phone]
E-mail : [email protected]
URL : www.nitto-kohki.co.jp
Keep the manual handy – so you can use it whenever necessary.
Specifications
Model A-300
Maximum Operating Pressure 0.6 MPa
Air Consumption (No Load) 0.3 m3/min
Rated Speed (No Load) 2600 min-1
Sound Pressure Level 97 dB(A)
Sound Power Level 108 dB(A)
Vibration Level ≧30 m/s2
Chisel Shank Dia. 10 mm
Mass (Weight) 1.7 kg
Thread Size of Air Inlet Rc1/4
AIR HAMMER
Please read this manual carefully before you attempt to use
your tool so that you may use it properly and safely.
AUTO CHISEL Model A-300
PROFESSIONAL TOOL
Original Instructions
TQ12831-1

1
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.
Thank you very much for your purchase of this
Nitto Kohki products.
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.
・English : Please ask your dealer or
distributor for instruction manual
in local language(s).
・German : Bitte fragen Sie lhren Händler
nach eine Betriebsanleitung in
Landessprache.
・French : S'il vous plait, veuillez demandez
á votre foumisseur de manuel
instruction en langue locale.
・Spanish : Por favor, cantacte con su
distribuidor para el manual de
instrucciones en español.
・Portuguese : Por favor pessa ao seo agente
ou distribuidor o manual de
instrucces ih linguagen local.
・Italian : Per Manuale Istruzioni in lingua
locale Vi preghiamo di rivolgervi
al rivenditore o distributore.
・Dutch : Vraag uw handelaar
om een nederladstalige
gebruiksaanwijzing.
・Swedish : Be er lokala Åtreförsäljare eller
distributör om manualer pá
svenska.
・Danish : Venligst henvend Dem til den
danske distributørfor instructions
manualer.
・Polish : Prosze pytac swojego dealera
lub dystrybutora o instrukcje
obslugi w jezyku localnym.
・中文 :請向當地供應商或経銷商詢問中
文使用説明書
CONTENTS page
IMPORTANT SAFETY INSTRUCTIONS ……………………2
GENERAL: TOOLS ……………………………………………2
GENERAL: PNEUMATIC TOOLS …………………………3
INSTRUCTIONS FOR THIS TOOL …………………………3
1. USAGE ……………………………………………………4
2. CHECK THE CONTENTS OF THE PACKAGE ……… 4
3. AIR SUPPLY ……………………………………………… 4
4. PREPARATION …………………………………………4
5. HOW TO OPERATE THE TOOL ………………………5
6. MAINTENANCE AND INSPECTION …………………… 6
7. THEREAD SIZE OF HOSE FITTING……………………6
8. STORAGE …………………………………………………6
9. ORDERING SERVICE PARTS …………………………7
10. TYPE OF CHISELS AND THEIR APPLICATIONS ……7
PICTOGRAM
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 using.
Always wear suitable eye protection.
Always wear suitable hearing protection.
Always wear respiratory protective equipment (PPE).
Always wear protective gloves for protection of hands
from Vibration and Shock.

2
IMPORTANT SAFETY
INSTRUCTIONS
When using the tool, please observe the safety
precautions below to prevent possible accident or injury.
GENERAL: TOOLS
WARNING
TO OPERATORS
●Wear proper clothing for the type of work being
done.
Take care so that clothing, ties, hair, etc. will not
become entangled with the moving parts. If items
become entangled it will cause the operator to be
pulled towards the tool and lead to possible cause of
accident or injury.
●Always wear suitable eye protection.
Vision correction glasses are not safety glasses.
Always wear appropriate safety glasses when doing
your job.
●Always wear suitable hearing protection.
●Wear respiratory protective equipment (PPE).
Wear respiratory protective equipment (PPE) when
working in an environment where dust particles are
generated in operation.
●Always wear suitable protective gloves.
●Avoid working posture that is too stressful.
Always ensure a firm footing and well balanced
posture.
●Do not operate the tool if you are too tired.
●Never touch any moving parts of the tool when
running.
ABOUT WORK AREA
●Keep the work area clean.
Cluttered work areas (e.g. workbench) invite
accidents.
●Carefully select the work area.
Do not expose tool to rain.
Do not use tool in a wet or soaked area.
See that the work area is adequately illuminated.
●Never work near inflammable liquid or in a
potentially explosive atmosphere.
●Keep children away from the work area.
Keep children and unauthorized people away from
the work area to avoid accident or injury.
BEFORE OPERATION
●Inspect tool before use.
Before using, check that screws are securely
tightened, that any protective cover or guard is
securely in place, other parts are free from damage
and that the tool runs as it should.
Check that moving parts are properly adjusted for
positioning and tightened, that parts are free from
damage and properly mounted, and that all other
parts are in good condition for normal operation.
Should you find any damage to the protective
cover or other part, replace it in accordance with
the Operation Manual.If there are no instructions
in the Manual, please contact the sales agent
through which you have purchased your tool or an
authorized dealer near you for repair.
Likewise, if a switch failure occurs, contact sales
agent through which you have purchased your tool
or an authorized dealer near you for repair. .
Do not use the tool if it does not start or stop with
the start/stop switch.
●Securely mount cutter
An improperly mounted cutter may fly out, causing
possible damage to the tool or injury to the operator.
●Always remove spanner, wrench, etc., once
adjustment has been made with them.
●Use a tool appropriate for the application.
Avoid heavy-duty application that is beyond the
capacity of tool.
●Do not use the tool for purposes other than what
it is designed for.
●Do not abuse tool.
Use tool in accordance with the specifications: you’ll
get the most out of it while ensuring safety.
●Securely fasten workpiece in place.
Use a vice or clamp tosecurely fasten the workpiece
in place. It is much safer this way than holding it in
your hand, allowing you to operate the tool with both
hands.
ABOUT HANDLING
●How to store tool.
When the tool is not used, store it in a dry area and
out of reach of children.
●How to carry tool.
Do not touch the start switch while the tool is being
carried.
●Do not leave the tool unattended while it is
running.
Turn off the start switch and disconnect the tool from

3
power source. Do not leave the work area until the
tool comes to a complete stop.
MAINTENANCE/SERVICE
●Do not take apart or modify tool.
Disassembly or modification carried out without
the supervision of a qualified or authorized service
engineer could result in an accident or injury.
●Inspect cutting tool and accessories, etc.
Always check to see that cutting tool and
accessories, etc. are in good operating condition
without damage or deterioration before you mount
them on the tool. Should you find any damage to
an accessory or part, please contact sales agent
through which you have purchased your tool or an
authorized dealer near you for repair.
●Check parts for damage.
When you have found damage to accessory or other
part, carefully check the damaged part to determine
the extent of influence it has upon the functions
of the tool – that is, determine whether it can still
perform its normal functions.
Check to see that the linkage of the moving parts
is OK, that all parts are OK without damage,
that they are properly mounted, and that the tool
functions normally. Should you find any damage
to an accessory or part that may hamper proper
functioning of the tool, please contact sales agent
through which you have purchased your tool or an
authorized dealer near you for repair.
●Have your tool repaired at an authorized Nitto
Service Center.
For repair or parts replacement, please contact the
sales agent through which you have purchased your
tool or an authorized dealer near you.
●Use only Nitto genuine parts.
Use of improper parts may result in serious accident.
To obtain a Nitto genuine part, consult this Manual
or contact the sales agent from which you have
purchased your tool directly.
● Do not detach label or nameplate from tool.
When a label/nameplate gets damaged, worn or
becomes missing, contact the sales agent through
which you have purchased your tool or Nitto Kohki
Co. Ltd, directly for a replacement.
DISPOSAL
When a tool is taken permanently out of service, it is
advised that the tool is disassembled, degreased and
parts separated by material and recycled locally in the
appropriate manner.
GENERAL: PNEUMATIC
TOOLS
WARNING
●Use appropriate air pressure.
Excessively high air pressure will increase the tool
number of revolutions or strokes causing not only
potential premature failure/breakage but could also
lead to an unexpected accident or injury.
●Connect tool to air supply line.
There are various types of pipes running in a factory
in addition to the pneumatic line (such as oxygen,
nitrogen, gas and water). For this reason, always
ensure that you are connecting to the pneumatic
line.
●Start tool properly.
Turn the start switch OFF before connecting to the
air supply line.
●Always disconnect the tool from the air supply
line before putting on/taking off any accessory
and prior to carrying out any maintenance work.
●Avoid exposure to exhaust air.
Pneumatic tool exhaust air contains oil and
contaminated moisture. Make sure the exhaust air is
not directed towards your face or anyone else within
the work area.
●Keep tool off electricity.
This pneumatic tool is not electrically insulated. To
avoid a potential electric shock do not use where
there is a possibility of coming into contact with live
electricity.
CAUTION
●Handle tool carefully.
Abusive use of tool could invite failure or accident.
Do not throw, drop or shock the tool.
●Handle air hose carefully.
Do not carry the tool by the air hose.
Do not pull the air hose to disconnect.

4
INSTRUCTIONS FOR
THIS TOOL
About Your Tool
WARNING
●Wear protective glasses and a dustproof mask
operation generates chips and dust particles, etc.
which may cause eye and/or respiratory injury:
Always use PPE (Personal Protective Equipment)
for eye and respiratory protection.
●Wear vibration reducing and shock absorbing
gloves.
This is a power tool utilizing vibration. Wear vibration
reducing and shock absorbing gloves . When your
hands, fingers, arms, etc. feel discomfort during
operations, immediately stop your work. Long hour
operation should be prohibited, for it may cause
Vibration - Induced disorder.
●Always wear suitable hearing protection.
The tool generates loud noise. Always use ear plugs
for hearing protection. Take necessary measures to
comply with the local regulatory requirements and
laws with regard to noise level, or do better.
●Do not operate tool at no load.
Do not operate the tool at no load: It may not only
cause damage to the tool but also may cause
chisels to fracture and fly out, possibly resulting in
unexpected accident.
●Be sure to keep hands clear of chisel edge.
●Fix the chisel firmly. If the chisel is not fixed
firmly , it may jump out and cause injury.
1. USAGE
This tool is for chipping work pieces with a chisel.
2. CHECK THE CONTENTS OF THE PACKAGE
Check the contents and make sure that the tool does
not have any damage which may have occurred
during transportation. The contents should correspond
to the list as follows. In case of damage/missing
parts, please contact the sales agent from whom you
purchased the tool.
Package Contents Qty Check
A-300 1
Bushing R1/4×NPT1/4 1
Hose Nipple R1/4×1/4 1
Instruction Manual 1
Declaration of Conformity 1
Caution for Use 1
3. AIR SUPPLY
3-1. Air Pressure
Adjust air pressure with the air regulator to the level
appropriate for the pneumatic tool used.
Air pressure that is too low will fails the tool to
operate at full capacity
Air pressure that is too high may cause damage to
the tool.
3-2. Air Line (Fig.1)
Use a 9.5mm (3/8”) I.D. connecting hose between
the compressor and the tool.
Drained water, etc., if flown into the tool, could
cause tool failure. Install an air filter, between the
compressor and the tool.
Air Regulator Oiler
Air Filter
Compressor
Lubrication
Tool 9.5mm (3/8”) I.D.
Hose
Cupla
Fig. 1
3-3. Lubrication
Install an oiler between the compressor and the tool.
Use the machine oil ISO VG-10. Failure to lubricate
as required may result in damage to the tool. Use of
oil that is too thick will reduce the performance of the
tool.
3-4. Short hose fittings
Do not fix a coupling directly on the tool. Make sure
that after a short hose is fixed with the Hose Nipple
R1/4X1/4 including in the accessories, then the
coupling be attached. If the couplings directly fixed,
it would be damaged by the vibration and the life
would be shortened.
4. PREPARATIONS
WARNING
Turn off the air supply and disconnect the air hose
before preparation for use.
4-1. Fixing the Attachment (Fig.2)
Fix the Hose Nipple to the Bushing (M16XRc1/4) of

5
the tool.
Bushing (M16×Rc1/4)
Hose Nipple
Fig. 2
4-2. Replacing Chisels
(1) Turn the Chisel Spring counterclockwise and
remove it. (For removal, hold the spring A and
turn it in such a way that it is loosened)
(2) Change the Chisel and reassemble vice versa.
(3) To mount the Chisel, insert the Chisel and lock
the Chisel Spring by turning it clockwise to
prevent the Chisel from being withdrawn.
Fig. 3
5. HOW TO OPERATE THE TOOL
WARNING
Do not operate tool at no load.
5-1. Start and Stop(Fig.4)
(1) Before connecting to the air hose, make sure
that the Trigger is in OFF position.
(2) To start, hold the machine and grasp the Trigger
(3) To stop, leave the hand off the Trigger.
Fig. 4
5-2. To prevent the chisel jumping (Fig.5)
To prevent the Chisel jumping (Fig.5)
First, grasp the grip and place the Chisel tothe work.
Gradually press the Trigger and 90 to full operation
after the cutting position has been determined. The
Chisel should not jump off the work.
Use the hand holding the valve body to press gently
and guide the Chisel so that it does not come away
from the work
Fig. 5
6. MAINTENANCE AND INSPECTION
When reshaping the edge of the Chisel, apply water
sometimes so that it may not be heated too much.
7. THREAD SISE OF HOSE FITTING
The product comes with a metal-fitting with R thread.
Connect the Bushing R thread X NPT thread included
as standard accessories. If you would like to have
American NPT thread instead.
8. STORAGE
CAUTION
When tool is not used, store it out of children.
Avoid storing the tool in a location subject to high
humidity, if the tool is left as it is used, residual
moisture on the inside can cause rusting. Before
storing, and after operation, oil the tool at the air inlet
with machine oil IS0 VG-10 and run it for a short
time.
9. ORDERING SERVICE PARTS
For further operational and handling information or
for replacement of parts and components, contact the
company from whom you purchased the tool or an
authorized dealer.
In ordering parts and components give each part
number, part name and quantity required.
Use only NITTO genuine parts.

6
10. TYPE OF CHISELS AND THEIR APPLICATIONS
Please order with the chisel numbers below.
No.1001 Blank Chisel
Bending iron plate, removing king pins.
No.1002 Flat Chisel
Puts increased efficiehcy into scraping,
peeling spot welds, and cutting off bolts
and pins.
No.1003 Sheet Metal Chisel A
Cutting iron sheets, body panels of
automobiles.
No.1004 Sheet Metal Chisel B
Just for cutting off sheet metal body panels.
No.1005 Silencer Cutting Chisel
A quick cut-off chisel for muffler piping.
No.1006 Rubber Bushing Remover
Helps you remove idle arm sleeves and
bushing very quickly.
No.1007 Spot Weld Booster
This chisel is ideal for peeling off spot
welded points and cutting off pins.
No.1008 Bushing Tool
Puts speed and ease into the job of
bushing insertion.
No.1009 Punch
For driving out pins, rivets, and fitting and
removing bearings and bearing races.
No.1010 Bushing Removing Tool
A faster and suitable tool in removing
bushings.
No.1011 Sheet Metal Punch
Opens holes for bolts and rivets.
No.1012 Bending Chisel
Helps the serviceman in peeling and
removing slag around welds.
No.1013 Fork Chisel 24
Disconnecting tie rod ends and ball joints.
No.1014 Panel Crimper
Bending sheet metal: external body
plates, doors, fenders, etc.
No.1016 Fork Chisel 35
Disconnecting tie rod end ball joints.
No.1017 Fork Chisel 15
Disconnecting tie rod end ball joints.
No.1018 Scraper 38mm
Peeling off paint & removing rust from
iron plate.
No.1019 Scraper 60mm
Peeling off paint & removing rust from
iron plate.
No.1020 Concave Scraper 60mm
Removing incrustation from pipe.
No.1023 Sheet Metal Chisel C
Cut shapes in sheet metal fast.
No.1024 Moilpoint Chisel
Breaking up concrete, removing sand
from cast-ings.
No.1025 Rivet Removing Punch
Removing rivets from brake lining of
heavy duty cars.
No. 1025
No.1026 Rivet Caulking Chisel
Caulking brake lining of heavy duty cars.
No. 1026

Printed in JAPAN TQ12831-1
Overseas Affiliates / Offices
NITTO KOHKI U.S.A., INC.
46 Chancellor Drive, Roselle, IL 60172 U.S.A.
Tel: [phone] Fax:[phone]
NITTO KOHKI EUROPE CO., LTD.
Unit 21, The Empire Centre Imperial Way,
Watford Herts, WD24 4TS, U.K.
Tel: [phone] Fax:[phone]
NITTO KOHKI DEUTSCHLAND GMBH
Lerchenstr.47 D-71144 Steinenbronn, Germany
Tel: [phone] Fax:[phone]
NITTO KOHKI CO., LTD., SINGAPORE BRANCH
10 UBI CRESCENT #01-62,
UBI TECHPARK LOBBY D, SINGAPORE 408564,
Tel: [phone] Fax:[phone]
NITTO KOHKI CO., LTD.,
BANGKOK REPRESENTATIVE OFFICE
M&A Business Center 38Q. House Convent Bldg.,
7th Floor, Unit 7A, Convent Rd., Silom, Bangrak,
Bangkok 10500 Thailand
Tel: [phone] Fax:[phone]
NITTO KOHKI AUSTRALIA PTY. LTD.
77 Brandl St., Brisbane Technology Park,
Eight Mile Plains QLD 4113 Australia
Tel: [phone] Fax:[phone]
NITTO KOHKI (SHANGHAI) CO., LTD.
Room1506, suite C, Orient International Plaza,
NO85 LouShanGuan Road,Shanghai, 200336, CHINA
Tel: [phone] Fax:[phone]
NITTO KOHKI CO., LTD.,
SHENZHEN REPRESENTATIVE OFFICE
2005C Shenzhen ICC Tower, Fuhuasanlu 168, Futian District,
Shenzhen, Guangdong, 518048 China
Tel: [phone] Fax:[phone]