Read through carefully and understand these instructions before use.

Disc Grinder

Handling instructions

G18MR • G23MR

G23MR

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1

1

3

2

4

15 – 30°

A B

G a

H 61 6.5 mm

I 89 8.5 mm

22.5 mma

12

3

4

5

78

6

9

0

A

B

C

DE

0

8

G

F

HI

JK

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Symbols

WARNINGThe following show symbolsused for the machine. Be surethat you understand theirmeaning before use.

To reduce the risk of injury,user must read instructionmanual.

Always wear eye protection.

1

2

3

4

5

6

7

8

9

0

A

B

C

D

E

F

G

H

I

J

K

Brush cover

Socket for side handle

Push button (Spindle lock)

Spindle

Across flats

Hexagonal bar wrench

Wheel guard

Wheel washer

Depressed center wheel

Wheel nut

Wrench

Diamond wheel

Side handle

Lock button

Switch

Wear limit

No. of carbon brush

Usual carbon brush

Auto-stop carbon brush

Spring

Brush holder

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3

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4

13.5.16, 1:54 PM4

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13.5.16, 11:48 AM5

6

�

�

�

�

º º

13.5.16, 1:55 PM6

7

�

�

�

�

�

�

�

13.5.16, 11:49 AM7

8

13.5.16, 11:49 AM8

9

GENERAL POWER TOOL SAFETY WARNINGS

WARNINGRead all safety warnings and all instructions.

Failure to follow the warnings and instructions may resultin electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.The term “power tool” in the warnings refers to yourmains-operated (corded) power tool or battery-operated(cordless) power tool.1) Work area safety

a) Keep work area clean and well lit.

Cluttered or dark areas invite accidents.b) Do not operate power tools in explosive

atmospheres, such as in the presence of

flammable liquids, gases or dust.Power tools create sparks which may ignite thedust or fumes.

c) Keep children and bystanders away whileoperating a power tool.

Distractions can cause you to lose control.2) Electrical safety

a) Power tool plugs must match the outlet.

Never modify the plug in any way.

Do not use any adapter plugs with earthed(grounded) power tools.

Unmodified plugs and matching outlets willreduce risk of electric shock.

b) Avoid body contact with earthed or grounded

surfaces, such as pipes, radiators, ranges and

refrigerators.There is an increased risk of electric shock if yourbody is earthed or grounded.

c) Do not expose power tools to rain or wetconditions.

Water entering a power tool will increase the riskof electric shock.

d) Do not abuse the cord. Never use the cord for

carrying, pulling or unplugging the power tool.

Keep cord away from heat, oil, sharp edges ormoving parts.Damaged or entangled cords increase the risk ofelectric shock.

e) When operating a power tool outdoors, use an

extension cord suitable for outdoor use.

Use of a cord suitable for outdoor use reduces therisk of electric shock.

f) If operating a power tool in a damp location is

unavoidable, use a residual current device (RCD)protected supply.

Use of an RCD reduces the risk of electric shock.3) Personal safety

a) Stay alert, watch what you are doing and use

common sense when operating a power tool.

Do not use a power tool while you are tired orunder the influence of drugs, alcohol or medication.

A moment of inattention while operating powertools may result in serious personal injury.

b) Use personal protective equipment. Always wear

eye protection.

Protective equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protectionused for appropriate conditions will reducepersonal injuries.

c) Prevent unintentional starting. Ensure the switch

is in the off-position before connecting to power

source and/or battery pack, picking up or carryingthe tool.

Carrying power tools with your finger on theswitch or energising power tools that have theswitch on invites accidents.

d) Remove any adjusting key or wrench before

turning the power tool on.A wrench or a key left attached to a rotating part ofthe power tool may result in personal injury.

e) Do not overreach. Keep proper footing andbalance at all times.

This enables better control of the power tool inunexpected situations.

f) Dress properly. Do not wear loose clothing or

jewellery. Keep your hair, clothing and gloves

away from moving parts.Loose clothes, jewellery or long hair can be caughtin moving parts.

g) If devices are provided for the connection of dustextraction and collection facilities, ensure these

are connected and properly used.

Use of dust collection can reduce dust relatedhazards.

4) Power tool use and care

a) Do not force the power tool. Use the correctpower tool for your application.

The correct power tool will do the job better andsafer at the rate for which it was designed.

b) Do not use the power tool if the switch does not

turn it on and off.

Any power tool that cannot be controlled with theswitch is dangerous and must be repaired.

c) Disconnect the plug from the power source and/

or the battery pack from the power tool beforemaking any adjustments, changing accessories,

or storing power tools.

Such preventive safety measures reduce the riskof starting the power tool accidentally.

d) Store idle power tools out of the reach of children

and do not allow persons unfamiliar with thepower tool or these instructions to operate the

power tool.

Power tools are dangerous in the hands ofuntrained users.

e) Maintain power tools. Check for misalignment or

binding of moving parts, breakage of parts andany other condition that may affect the power

tool's operation.

If damaged, have the power tool repaired beforeuse.

Many accidents are caused by poorly maintainedpower tools.

f) Keep cutting tools sharp and clean.

Properly maintained cutting tools with sharpcutting edges are less likely to bind and are easierto control.

g) Use the power tool, accessories and tool bits etc.

in accordance with these instructions, taking intoaccount the working conditions and the work to

be performed.

Use of the power tool for operations differentfrom those intended could result in a hazardoussituation.

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10

5) Service

a) Have your power tool serviced by a qualified

repair person using only identical replacementparts.

This will ensure that the safety of the power toolis maintained.

PRECAUTIONKeep children and infirm persons away.

When not in use, tools should be stored out of reach of

children and infirm persons.

SAFETY WARNINGS COMMON FOR GRINDINGOR CUTTING-OFF OPERATIONS

a) This power tool is intended to function as a grinder

or cut-off tool. Read all safety warnings, instructions,

illustrations and specifications provided with thispower tool.

Failure to follow all instructions listed below mayresult in electric shock, fire and/or serious injury.

b) Operations such as sanding, polishing, wire brushing

or abrasive cutting-off are not recommended to be

performed with this power tool.Operations for which the power tool was notdesigned may create a hazard and cause personalinjury.

c) Do not use accessories which are not specifically

designed and recommended by the tool

manufacturer.Just because the accessory can be attached to yourpower tool, it does not assure safe operation.

d) The rated speed of the accessory must be at leastequal to the maximum speed marked on the power

tool.

Accessories running faster than their rated speedcan break and fly apart.

e) The outside diameter and the thickness of your

accessory must be within the capacity rating of yourpower tool.

Incorrectly sized accessories cannot be adequatelyguarded or controlled.

f) The arbour size of wheels, flanges, backing pads or

any other accessory must properly fit the spindle of

the power tool.Accessories with arbour holes that do not matchthe mounting hardware of the power tool will runout of balance, vibrate excessively and may causeloss of control.

g) Do not use a damaged accessory. Before each use

inspect the accessory such as abrasive wheels forchips and cracks, backing pad for cracks, tear or

excess wear, wire brush for loose or cracked wires. If

power tool or accessory is dropped, inspect fordamage or install an undamaged accessory. After

inspecting and installing an accessory, position

yourself and bystanders away from the plane of therotating accessory and run the power tool at

maximum no-load speed for one minute.

Damaged accessories will normally break apartduring this test time.

h) Wear personal protective equipment. Depending on

application, use face shield, safety goggles or safetyglasses. As appropriate, wear dust mask, hearing

protectors, gloves and workshop apron capable of

stopping small abrasive or workpiece fragments.

The eye protection must be capable of stoppingflying debris generated by various operations. Thedust mask or respirator must be capable of filtratingparticles generated by your operation. Prolongedexposure to high intensity noise may cause hearingloss.

i) Keep bystanders a safe distance away from work

area. Anyone entering the work area must wear

personal protective equipment.Fragments of workpiece or of a broken accessorymay fly away and cause injury beyond immediatearea of operation.

j) Hold power tool by insulated gripping surfaces only,

when performing an operation where the cutting

accessory may contact hidden wiring or its owncord.

Cutting accessory contacting a”live” wire may makeexposed metal parts of the power tool “live” andshock the operator.

k) Position the cord clear of the spinning accessory.

If you lose control, the cord may be cut or snaggedand your hand or arm may be pulled into thespinning accessory.

l) Never lay the power tool down until the accessoryhas come to a complete stop.

The spinning accessory may grab the surface andpull the power tool out of your control.

m) Do not run the power tool while carrying it at your

side.

Accidental contact with the spinning accessory couldsnag your clothing, pulling the accessory into yourbody.

n) Regularly clean the power tool’s air vents.The motor’s fan will draw the dust inside the housingand excessive accumulation of powdered metal maycause electrical hazards.

o) Do not operate the power tool near flammable

materials.

Sparks could ignite these materials.p) Do not use accessories that require liquid coolants.

Using water or other liquid coolants may result inelectrocution or shock.

KICKBACK AND RELATED WARNINGS

Kickback is a sudden reaction to a pinched or snaggedrotating wheel, backing pad or any other accessory. Pinchingor snagging causes rapid stalling of the rotating accessorywhich in turn causes the uncontrolled power tool to beforced in the direction opposite of the accessory’s rotationat the point of the binding.For example, if an abrasive wheel is snagged or pinched bythe workpiece, the edge of the wheel that is entering intothe pinch point can dig into the surface of the materialcausing the wheel to climb out or kick out. The wheel mayeither jump toward or away from the operator, dependingon direction of the wheel’s movement at the point ofpinching. Abrasive wheels may also break under theseconditions.Kickback is the result of power tool misuse and/orincorrect operating procedures or conditions and can beavoided by taking proper precautions as given below.

13.5.16, 11:50 AM10

11

a) Maintain a firm grip on the power tool and position

your body and arm to allow you to resist kickback

forces. Always use auxiliary handle, if provided, formaximum control over kickback or torque reaction

during start-up.

The operator can control torque reactions or kickbackforces, if proper precautions are taken.

b) Never place your hand near the rotating accessory.

Accessory may kickback over your hand.c) Do not position your body in the area where power

tool will move if kickback occurs.

Kickback will propel the tool in direction oppositeto the wheel’s movement at the point of snagging.

d) Use special care when working corners, sharp edges

etc. Avoid bouncing and snagging the accessory.Corners, sharp edges or bouncing have a tendencyto snag the rotating accessory and cause loss ofcontrol or kickback.

e) Do not attach a saw chain woodcarving blade or

toothed saw blade.

Such blades create frequent kickback and loss ofcontrol.

SAFETY WARNINGS SPECIFIC FOR GRINDINGAND DIAMOND WHEEL CUTTING-OFFOPERATIONS

a) Use only wheel types that are recommended for

your power tool and the specific guard designed forthe selected wheel.

Wheels for which the power tool was not designedcannot be adequately guarded and are unsafe.

b) The guard must be securely attached to the power

tool and positioned for maximum safety, so the leastamount of wheel is exposed towards the operator.

The guard helps to protect operator from brokenwheel fragments and accidental contact with wheel.

c) Wheels must be used only for recommended

applications. For example: do not grind with the side

of cut-off wheel.Abrasive cut-off wheels are intended for peripheralgrinding, side forces applied to these wheels maycause them to shatter.

d) Always use undamaged wheel flanges that are of

correct size and shape for your selected wheel.

Proper wheel flanges support the wheel thusreducing the possibility of wheel breakage. Flangesfor cut-off wheels may be different from grindingwheel flanges.

e) Do not use worn down wheels from larger power

tools.

Wheel intended for larger power tool is not suitablefor the higher speed of a smaller tool and mayburst.

ADDITIONAL SAFETY WARNINGS SPECIFICFOR DIAMOND WHEEL CUTTING-OFFOPERATIONS

a) Do not "jam" the cut-off wheel or apply excessive

pressure. Do not attempt to make an excessive depthof cut.

Overstressing the wheel increases the loading andsusceptibility to twisting or binding of the wheelin the cut and the possibility of kickback or wheelbreakage.

b) Do not position your body in line with and behindthe rotating wheel.

When the wheel, at the point of operation, is movingaway from your body, the possible kickback maypropel the spinning wheel and the power tool directlyat you.

c) When wheel is binding or when interrupting a cutfor any reason, switch off the power tool and hold

the power tool motionless until the wheel comes to

a complete stop. Never attempt to remove the cut-off wheel from the cut while the wheel is in motion

otherwise kickback may occur.

Investigate and take corrective action to eliminatethe cause of wheel binding.

d) Do not restart the cutting operation in the workpiece.

Let the wheel reach full speed and carefully reenterthe cut.

The wheel may bind, walk up or kickback if thepower tool is restarted in the workpiece.

e) Support panels or any oversized workpiece to

minimize the risk of wheel pinching and kickback.

Large workpieces tend to sag under their ownweight. Supports must be placed under theworkpiece near the line of cut and near the edgeof the workpiece on both sides of the wheel.

f) Use extra caution when making a "pocket cut" into

existing walls or other blind areas.

The protruding wheel may cut gas or water pipes,electrical wiring or objects that can cause kickback.

PRECAUTIONS ON USING DISC GRINDER

1. Never operate these power tools without WheelGuards.

2. Check that speed marked on the wheel is equal to orgreater than the rated speed of the grinder.Use only depressed center wheels rated at 80 m/s.

3. Ensure that the wheel dimensions are compatiblewith the grinder and that the wheel fits the spindle.

4. Abrasive wheels shall be stored and handled withcare in accordance with manufacturer’s instructions.

5. Inspect the depressed center wheel before use, donot use chipped, cracked or otherwise defectiveproducts.

6. Always hold the body handle and side handle of thepower tool firmly. Otherwise the counterforceproduced may result in inaccurate and evendangerous operation.

7. Do not use cutting-off wheels for side grinding.8. Do not use of separate reducing bushings or adapters

to adapt large hole abrasive wheels.9. The wheel continues to rotate after the tool is switched

off.

13.5.16, 11:50 AM11

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SPECIFICATIONS

STANDARD ACCESSORIES

(1) Wrench ........................................................................ 1(2) Side handle ................................................................. 1(3) Hexagonal bar wrench ............................................... 1Depressed center wheels are not provided as standardaccessories.Standard accessories are subject to change withoutnotice.

APPLICATIONS

� Removal of casting fin and finishing of various typesof steel, bronze and aluminum materials and castings.

� Grinding of welded sections or sections cut by meansof a cutting torch.

� Grinding of synthetic resins, slate, brick, marble, etc.� Cutting of synthetic concrete, stone, brick, marble

and similar materials.

PRIOR TO OPERATION

1. Power source

Ensure that the power source to be utilized conformsto the power requirements specified on the productnameplate.

2. Power switchEnsure that the power switch is in the OFF position. Ifthe plug is connected to a receptacle while the powerswitch is in the ON position, the power tool will startoperating immediately, which could cause a seriousaccident.

3. Extension cordWhen the work area is removed from the powersource, use an extension cord of sufficient thicknessand rated capacity. The extension cord should bekept as short as practicable.

4. Fitting and adjusting the wheel guard

The wheel guard is a protective device to prevent injuryshould the depressed center wheel shatter duringoperation. Ensure that the guard is properly fitted andfastened before commencing grinding operation. Byslightly loosening the setting screw, the wheel guardcan be turned and set at any desired angle for maximumoperational effectiveness. Ensure that the setting screwis thoroughly tightened after adjusting the wheel guard.

5. Ensure that the depressed center wheel to be utilizedis the correct type and free of cracks or surface defects.Also ensure that the depressed center wheel isproperly mounted and the wheel nut is securelytightened. Refer to the section on “Assembling andDisassembling the Depressed Center Wheel”.

6. Conducting a trial run

Ensure that the abrasive products is correctlymounted and tightened before use and run the toolat no-load for 30 seconds in a safe position, stopimmediately if there is considerable vibration or ifother defects are detected.If this condition occurs, check the machine todetermine the cause.

7. Confirm the spindle lock mechanismConfirm that the spindle lock is disengaged by pushingpush button two or three times before switching thepower tool on (See Fig. 1).

8. Fixing the side handle

Screw the side handle into the gear cover.

PRACTICAL GRINDER APPLICATION

1. Pressure

To prolong the life of the machine and ensure a firstclass finish, it is important that the machine shouldnot be overloaded by applying too much pressure. Inmost applications, the weight of the machine alone issufficient for effective grinding. Too much pressurewill result in reduced rotational speed, inferior surfacefinish, and overloading which could reduce the life ofthe machine.

2. Grinding angle

Do not apply the entire surface of the depressedcenter wheel to the material to be ground. As shownin Fig. 2, the machine should be held at an angle of15° – 30° so that the external edge of the depressedcenter wheel contacts the material at an optimumangle.

3. To prevent a new depressed center wheel fromdigging into the workpiece, initial grinding should beperformed by drawing the grinder across theworkpiece toward the operator (Fig. 2 direction B).Once the leading edge of the depressed center wheelis properly abraded, grinding may be conducted ineither direction.

Model G18MR G23MR

Voltage 220 V

Input 2050 W

No-load speed 8400 / min. 6600 / min.

WheelOuter dia. 180 mm 230 min

Diamond wheelInner dia. 22.23 mm

Peripheral speed 80 m/s

Weight (Only main body) 5.4 kg

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4. Switch operation

Switch ON: Push the locking button forward and thenpress the switch lever.* For continuous use, press the switch

lever. The switch lever is locked bypushing the locking button forwardonce again.(*Subject to change depending onarea.)

Switch OFF: Press and release the switch lever.5. Precautions immediately after finishing operation

After switching off the machine, do not put it downuntil the depressed center wheel has come to acomplete stop. Apart from avoiding serious accidents,this precaution will reduce the amount of dust andswarf sucked into the machine.

CAUTION

� Check that the work piece is properly supported.� Ensure that ventilation openings are kept clear when

working in dusty conditions.If it should become necessary to clear dust, firstdisconnect the tool from the mains supply (use non-metallic objects) and avoid damaging internal parts.

� Ensure that sparks resulting from use do not create ahazard e.g. do not hit persons, or ignite flammablesubstances.

� Always use eye and ear protection.Other personal protective equipment such as dustmask, gloves, helmet and apron should be wornwhen necessary.If in doubt, wear the protective equipment.

� When the machine is not used, the power sourceshould be disconnected.

ASSEMBLING AND DISASSEMBLING THEDEPRESSED CENTER WHEEL OR DIAMONDWHEEL

CAUTION

Be sure to switch OFF and disconnect the attachmentplug from the receptacle to avoid a serious accident.

1. Assembling (Fig. 1)

(1) Turn the machine upside down so that the spindle isfacing upward.

(2) Mount the wheel washer onto the spindle.(3) Fit the protruding part of the depressed center wheel

or diamond wheel onto the wheel washer.(4) Screw the wheel nut onto the spindle.

(For diamond wheel assembling, use the wheel nutwith the convex side against the diamond wheel.)

(5) Insert the push button to prevent rotation of thespindle, and tighten the wheel nut with the accessorywrench, as shown in Fig. 1.

2. Disassembling

Follow the above procedures in reverse.CAUTION

� Comfirm that the depressed center wheel is mountedfirmly.

� Confirm that the push button is disengaged bypushing push button two or three times beforeswitching the power tool on.

MAINTENANCE AND INSPECTION

1. Inspecting the depressed center wheel

Ensure that the depressed center wheel is free ofcracks and surface defects.

2. Inspecting the mounting screws

Regularly inspect all mounting screws and ensurethat they are properly tightened. Should any of thescrews be loose, retighten them immediately. Failureto do so could result in serious hazard.

3. Inspecting the carbon brushes (Fig. 3)

The motor employs carbon brushes which areconsumable parts.When they become worn to or near the “wear limit”, itcould result in motor trouble. When an auto-stop carbonbrush is equipped, the motor will stop automatically.At that time, replace both carbon brushes with newones which have the same carbon brush numbersshown in the figure. In addition, always keep carbonbrushes clean and ensure that they slide freely withinthe brush holders.

4. Replacing carbon brushes (Fig. 4)<Disassembly>(1) Loosen the D4 tapping screw retaining the brush

cover and remove the brush cover.(2) Use the auxiliary hexagonal wrench or small

screwdriver to pull up the edge of the spring that isholding down the carbon brush. Remove the edge ofthe spring toward the outside of the brush holder.

(3) Remove the end of the pig-tail on the carbon brushfrom the terminal section of brush holder and thenremove the carbon brush form the brush holder.

<Assembly>(1) Insert the end of the pig-tail of the carbon brush in

the terminal section of brush holder.(2) Insert the carbon brush in the brush holder.(3) Use the auxiliary hexagonal wrench or small

screwdriver to return the edge of the spring to thehead of the carbon brush.

(4) Mount the tail cover and tighten the D4 tapping screw.5. Maintenance of the motor

The motor unit winding is the very “heart” of thepower tool. Exercise due care to ensure the windingdoes not become damaged and/or wet with oil orwater.

6. Service parts listA : Item No.B : Code No.C : No. UsedD : Remarks

CAUTION

Repair, modification and inspection of Hitachi PowerTools must be carried out by a Hitachi AuthorizedService Center.This Parts List will be helpful if presented with thetool to the Hitachi Authorized Service Center whenrequesting repair or other maintenance.In the operation and maintenance of power tools, thesafety regulations and standards prescribed in eachcountry must be observed.

● Power supply cableIn case you need replacing of power supply cable,use the heavy polychloroprene sheathed flexible cable245IEC66 (YCW) or equivalent.

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MODIFICATIONS

Hitachi Power Tools are constantly being improvedand modified to incorporate the latest technologicaladvancements.Accordingly, some parts (i.e. code numbers and/ordesign) may be changed without prior notice.

NOTE

Due to HITACHI’s continuing program of research anddevelopment, the specifications herein are subject tochange without prior notice.

13.5.16, 11:50 AM14

15

AB

CD

2999

4192

4M

5×16

3394

9760

1M

8×25

3733

0038

138

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3068

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6000

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551

3225

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5332

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255

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5796

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198

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13.5.16, 11:50 AM15

16

AB

CD

2999

4192

4M

5×16

3394

9760

1M

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3733

0036

138

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140

9379

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14×2

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161

45A

6000

VV

160

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2L46

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3224

147

——

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9407

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198

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110V

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13.5.16, 11:50 AM16

17

13.5.16, 11:50 AM17

18

13.5.16, 11:50 AM18

311Code No. C99126124 MPrinted in Malaysia

Hitachi Koki Co., Ltd.

13.5.20, 1:28 PM2