Makita GA4590 ユーザーマニュアル

GA4590

GA4591

GA4592

GA5090

GA5091

GA5092

EN Angle Grinder INSTRUCTION MANUAL 8

ZHCN 角向磨光机使用说明书 21

ID Gerinda Sudut PETUNJUK PENGGUNAAN 34

MS Pengisar Sudut MANUAL ARAHAN 48

VI Máy Mài Góc Cầm Tay Hoạt

Động Bằng Động Cơ Điện TÀI LIỆU HƯỚNG DẪN 62

TH   75

2

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Fig.5

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3

Fig.7

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1

A

B

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C

Fig.9

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Fig.13

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Fig.17

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44

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Fig.20

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Fig.21

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15°

Fig.28

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6

Fig.30

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Fig.32

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2

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2

Fig.34

7

22

5

2

12

13 14

4

3

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7

8

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316

17

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66

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Fig.35

8ENGLISH

ENGLISH (Original instructions)

SPECIFICATIONS

Model: GA4590 GA4591 GA4592 GA5090 GA5091 GA5092

Applicable

grinding wheel

Max. wheel diameter 115 mm 125 mm

Max. wheel thickness 7.2 mm

Applicable cut-

o wheel

Max. wheel diameter 115 mm 125 mm

Max. wheel thickness 3.2 mm

Applicable wire

wheel brush

Max. wheel diameter 115 mm 125 mm

Max. wheel thickness 20 mm

Spindle thread M14 or 5/8"(country specic)

Max. spindle length 23 mm

No load speed (n0) / Rated speed (n) 11,500 min-1

Overall length 326 mm 349 mm 326 mm 349 mm 326 mm

Net weight 2.6 - 3.8 kg 2.8 - 4.0 kg 2.6 - 3.8 kg 2.8 - 4.0 kg 2.6 - 3.8 kg

Safety class /II

• Due to our continuing program of research and development, the specications herein are subject to change

without notice.

• Specications may dier from country to country.

• The weight may dier depending on the attachment(s). The lightest and heaviest combination, according to

EPTA-Procedure 01/2014, are shown in the table.

Symbols

The followings show the symbols which may be used

for the equipment. Be sure that you understand their

meaning before use.

Read instruction manual.

Wear safety glasses.

Always operate with two hands.

Do not use the wheel guard for cut-o

operations.

DOUBLE INSULATION

Only for EU countries

Due to the presence of hazardous compo-

nents in the equipment, used electrical and

electronic equipment may have a negative

impact on the environment and human

health.

Do not dispose of electrical and electronic

appliances with household waste!

In accordance with the European Directive

on waste electrical and electronic equip-

ment and its adaptation to national law,

used electrical and electronic equipment

should be collected separately and

delivered to a separate collection point

for municipal waste, operating in accor-

dance with the environmental protection

regulations.

This is indicated by the symbol of the

crossed-out wheeled bin placed on the

equipment.

Intended use

The tool is intended for grinding, sanding, wire brush-

ing, hole cutting and cutting of metal and stone materi-

als without the use of water.

Power supply

The tool should be connected only to a power supply of

the same voltage as indicated on the nameplate, and

can only be operated on single-phase AC supply. They

are double-insulated and can, therefore, also be used

from sockets without earth wire.

9ENGLISH

SAFETY WARNINGS

General power tool safety warnings

WARNING: Read all safety warnings, instruc-

tions, illustrations and specications provided

with this power tool. Failure to follow all instructions

listed below may result in electric shock, re and/or

serious injury.

Save all warnings and instruc-

tions for future reference.

The term “power tool” in the warnings refers to your

mains-operated (corded) power tool or battery-operated

(cordless) power tool.

Work area safety

1. Keep work area clean and well lit. Cluttered or

dark areas invite accidents.

2. Do not operate power tools in explosive atmo-

spheres, such as in the presence of ammable

liquids, gases or dust. Power tools create sparks

which may ignite the dust or fumes.

3. Keep children and bystanders away while

operating a power tool. Distractions can cause

you to lose control.

Electrical safety

1. 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. Unmodied plugs and matching outlets will

reduce risk of electric shock.

2. Avoid body contact with earthed or grounded

surfaces, such as pipes, radiators, ranges and

refrigerators. There is an increased risk of elec-

tric shock if your body is earthed or grounded.

3. Do not expose power tools to rain or wet con-

ditions. Water entering a power tool will increase

the risk of electric shock.

4. 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

or moving parts. Damaged or entangled cords

increase the risk of electric shock.

5. When operating a power tool outdoors, use an

extension cord suitable for outdoor use. Use of

a cord suitable for outdoor use reduces the risk of

electric shock.

6. 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.

7. Use of power supply via an RCD with a rated

residual current of 30 mA or less is always

recommended.

8. Power tools can produce electromagnetic

elds (EMF) that are not harmful to the user.

However, users of pacemakers and other similar

medical devices should contact the maker of their

device and/or doctor for advice before operating

this power tool.

9. Do not touch the power plug with wet hands.

10. If the cord is damaged, have it replaced by the

manufacturer or his agent in order to avoid a

safety hazard.

Personal safety

1. 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 or

under the inuence of drugs, alcohol or med-

ication. A moment of inattention while operating

power tools may result in serious personal injury.

2. Use personal protective equipment. Always

wear eye protection. Protective equipment such

as a dust mask, non-skid safety shoes, hard hat or

hearing protection used for appropriate conditions

will reduce personal injuries.

3. Prevent unintentional starting. Ensure the

switch is in the o-position before connecting

to power source and/or battery pack, picking

up or carrying the tool. Carrying power tools with

your nger on the switch or energising power tools

that have the switch on invites accidents.

4. Remove any adjusting key or wrench before

turning the power tool on. A wrench or a key left

attached to a rotating part of the power tool may

result in personal injury.

5. Do not overreach. Keep proper footing and

balance at all times. This enables better control

of the power tool in unexpected situations.

6. Dress properly. Do not wear loose clothing or

jewellery. Keep your hair and clothing away

from moving parts. Loose clothes, jewellery or

long hair can be caught in moving parts.

7. If devices are provided for the connection of

dust extraction and collection facilities, ensure

these are connected and properly used. Use of

dust collection can reduce dust-related hazards.

8. Do not let familiarity gained from frequent use

of tools allow you to become complacent and

ignore tool safety principles. A careless action

can cause severe injury within a fraction of a

second.

9. Always wear protective goggles to protect

your eyes from injury when using power tools.

The goggles must comply with ANSI Z87.1 in

the USA, EN 166 in Europe, or AS/NZS 1336

in Australia/New Zealand. In Australia/New

Zealand, it is legally required to wear a face

shield to protect your face, too.

10 ENGLISH

It is an employer's responsibility to enforce

the use of appropriate safety protective equip-

ments by the tool operators and by other per-

sons in the immediate working area.

Power tool use and care

1. Do not force the power tool. Use the correct

power tool for your application. The correct

power tool will do the job better and safer at the

rate for which it was designed.

2. Do not use the power tool if the switch does

not turn it on and o. Any power tool that cannot

be controlled with the switch is dangerous and

must be repaired.

3. Disconnect the plug from the power source

and/or remove the battery pack, if detachable,

from the power tool before making any adjust-

ments, changing accessories, or storing power

tools. Such preventive safety measures reduce

the risk of starting the power tool accidentally.

4. Store idle power tools out of the reach of chil-

dren and do not allow persons unfamiliar with

the power tool or these instructions to operate

the power tool. Power tools are dangerous in the

hands of untrained users.

5. Maintain power tools and accessories. Check

for misalignment or binding of moving parts,

breakage of parts and any other condition that

may aect the power tool’s operation. If dam-

aged, have the power tool repaired before use.

Many accidents are caused by poorly maintained

power tools.

6. Keep cutting tools sharp and clean. Properly

maintained cutting tools with sharp cutting edges

are less likely to bind and are easier to control.

7. Use the power tool, accessories and tool bits

etc. in accordance with these instructions, tak-

ing into account the working conditions and

the work to be performed. Use of the power tool

for operations dierent from those intended could

result in a hazardous situation.

8. Keep handles and grasping surfaces dry,

clean and free from oil and grease. Slippery

handles and grasping surfaces do not allow for

safe handling and control of the tool in unexpected

situations.

9. When using the tool, do not wear cloth work

gloves which may be entangled. The entangle-

ment of cloth work gloves in the moving parts may

result in personal injury.

Service

1. Have your power tool serviced by a qualied

repair person using only identical replacement

parts. This will ensure that the safety of the power

tool is maintained.

2. Follow instruction for lubricating and chang-

ing accessories.

Grinder safety warnings

Safety warnings common for grinding, sanding,

wire brushing, or cutting-o operations:

1. This power tool is intended to function as a

grinder, sander, wire brush, hole cutter or cut-

o tool. Read all safety warnings, instructions,

illustrations and specications provided with

this power tool. Failure to follow all instructions

listed below may result in electric shock, re and/

or serious injury.

2. Operations such as polishing are not to be

performed with this power tool. Operations for

which the power tool was not designed may create

a hazard and cause personal injury.

3. Do not convert this power tool to operate in

a way which is not specically designed and

specied by the tool manufacturer. Such a con-

version may result in a loss of control and cause

serious personal injury.

4. Do not use accessories which are not spe-

cically designed and specied by the tool

manufacturer. Just because the accessory can

be attached to your power tool, it does not assure

safe operation.

5. The rated speed of the accessory must be at

least equal to the maximum speed marked on

the power tool. Accessories running faster than

their rated speed can break and y apart.

6. The outside diameter and the thickness of your

accessory must be within the capacity rating

of your power tool. Incorrectly sized accessories

cannot be adequately guarded or controlled.

7. The dimensions of the accessory mounting

must t the dimensions of the mounting hard-

ware of the power tool. Accessories that do not

match the mounting hardware of the power tool

will run out of balance, vibrate excessively and

may cause loss of control.

8. Do not use a damaged accessory. Before each

use inspect the accessory such as abrasive

wheels for chips and cracks, backing pad for

cracks, tear or excess wear, wire brush for

loose or cracked wires. If power tool or acces-

sory is dropped, inspect for damage or install

an undamaged accessory. After inspecting and

installing an accessory, position yourself and

bystanders away from the plane of the rotating

accessory and run the power tool at maximum

no-load speed for one minute. Damaged acces-

sories will normally break apart during this test

time.

9. Wear personal protective equipment.

Depending on application, use face shield,

safety goggles or safety glasses. As appro-

priate, wear dust mask, hearing protectors,

gloves and workshop apron capable of stop-

ping small abrasive or workpiece fragments.

The eye protection must be capable of stopping

ying debris generated by various applications.

The dust mask or respirator must be capable

of ltrating particles generated by the particular

application. Prolonged exposure to high intensity

noise may cause hearing loss.

11 ENGLISH

10. 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 accessory

may y away and cause injury beyond immediate

area of operation.

11. Hold the power tool by insulated gripping

surfaces only, when performing an operation

where the cutting accessory may contact hid-

den wiring or its own cord. Cutting accessory

contacting a “live” wire may make exposed metal

parts of the power tool “live” and could give the

operator an electric shock.

12. Position the cord clear of the spinning acces-

sory. If you lose control, the cord may be cut or

snagged and your hand or arm may be pulled into

the spinning accessory.

13. Never lay the power tool down until the acces-

sory has come to a complete stop. The spinning

accessory may grab the surface and pull the

power tool out of your control.

14. Do not run the power tool while carrying it at

your side. Accidental contact with the spinning

accessory could snag your clothing, pulling the

accessory into your body.

15. Regularly clean the power tool’s air vents. The

motor’s fan will draw the dust inside the housing

and excessive accumulation of powdered metal

may cause electrical hazards.

16. Do not operate the power tool near ammable

materials. Sparks could ignite these materials.

17. Do not use accessories that require liquid

coolants. Using water or other liquid coolants

may result in electrocution or shock.

Kickback and related warnings:

Kickback is a sudden reaction to a pinched or snagged

rotating wheel, backing pad, brush or any other acces-

sory. Pinching or snagging causes rapid stalling of the

rotating accessory which in turn causes the uncon-

trolled power tool to be forced in the direction opposite

of the accessory’s rotation at the point of the binding.

For example, if an abrasive wheel is snagged or

pinched by the workpiece, the edge of the wheel that is

entering into the pinch point can dig into the surface of

the material causing the wheel to climb out or kick out.

The wheel may either jump toward or away from the

operator, depending on direction of the wheel’s move-

ment at the point of pinching. Abrasive wheels may also

break under these conditions.

Kickback is the result of power tool misuse and/or

incorrect operating procedures or conditions and can be

avoided by taking proper precautions as given below.

1. Maintain a rm grip with both hands on the

power tool and position your body and arms

to allow you to resist kickback forces. Always

use auxiliary handle, if provided, for maxi-

mum control over kickback or torque reaction

during start-up. The operator can control torque

reactions or kickback forces, if proper precautions

are taken.

2. Never place your hand near the rotating acces-

sory. Accessory may kickback over your hand.

3. Do not position your body in the area where

power tool will move if kickback occurs.

Kickback will propel the tool in direction opposite

to the wheel’s movement at the point of snagging.

4. Use special care when working corners, sharp

edges, etc. Avoid bouncing and snagging the

accessory. Corners, sharp edges or bouncing

have a tendency to snag the rotating accessory

and cause loss of control or kickback.

5. Do not attach a saw chain woodcarving blade,

segmented diamond wheel with a peripheral

gap greater than 10 mm or toothed saw blade.

Such blades create frequent kickback and loss of

control.

Safety warnings specic for grinding and cutting-o

operations:

1. Use only wheel types that are specied

for your power tool and the specic guard

designed for the selected wheel. Wheels for

which the power tool was not designed cannot be

adequately guarded and are unsafe.

2. The grinding surface of centre depressed

wheels must be mounted below the plane of

the guard lip. An improperly mounted wheel that

projects through the plane of the guard lip cannot

be adequately protected.

3. The guard must be securely attached to the

power tool and positioned for maximum safety,

so the least amount of wheel is exposed

towards the operator. The guard helps to protect

the operator from broken wheel fragments, acci-

dental contact with wheel and sparks that could

ignite clothing.

4. Wheels must be used only for specied appli-

cations. For example: do not grind with the

side of cut-o wheel. Abrasive cut-o wheels

are intended for peripheral grinding, side forces

applied to these wheels may cause them to

shatter.

5. Always use undamaged wheel anges that are

of correct size and shape for your selected

wheel. Proper wheel anges support the wheel

thus reducing the possibility of wheel breakage.

Flanges for cut-o wheels may be dierent from

grinding wheel anges.

6. Do not use worn down wheels from larger

power tools. A wheel intended for larger power

tool is not suitable for the higher speed of a

smaller tool and may burst.

7. When using dual purpose wheels always use

the correct guard for the application being

performed. Failure to use the correct guard may

not provide the desired level of guarding, which

could lead to serious injury.

Additional safety warnings specic for cutting-o

operations:

1. Do not “jam” the cut-o wheel or apply exces-

sive pressure. Do not attempt to make an

excessive depth of cut. Overstressing the wheel

increases the loading and susceptibility to twisting

or binding of the wheel in the cut and the possibil-

ity of kickback or wheel breakage.

12 ENGLISH

2. Do not position your body in line with and

behind the rotating wheel. When the wheel, at

the point of operation, is moving away from your

body, the possible kickback may propel the spin-

ning wheel and the power tool directly at you.

3. When the wheel is binding or when interrupt-

ing a cut for any reason, switch o the power

tool and hold it motionless until the wheel

comes to a complete stop. Never attempt to

remove the cut-o wheel from the cut while

the wheel is in motion otherwise kickback may

occur. Investigate and take corrective action to

eliminate the cause of wheel binding.

4. Do not restart the cutting operation in the

workpiece. Let the wheel reach full speed and

carefully re-enter the cut. The wheel may bind,

walk up or kickback if the power tool is restarted in

the workpiece.

5. Support panels or any oversized workpiece to

minimize the risk of wheel pinching and kick-

back. Large workpieces tend to sag under their

own weight. Supports must be placed under the

workpiece near the line of cut and near the edge

of the workpiece on both sides of the wheel.

6. Use extra caution when making a “pocket cut”

into existing walls or other blind areas. The

protruding wheel may cut gas or water pipes, elec-

trical wiring or objects that can cause kickback.

7. Do not attempt to do curved cutting.

Overstressing the wheel increases the loading and

susceptibility to twisting or binding of the wheel

in the cut and the possibility of kickback or wheel

breakage, which can lead to serious injury.

8. Before using a segmented diamond wheel,

make sure that the diamond wheel has the

peripheral gap between segments of 10 mm or

less, only with a negative rake angle.

Safety warnings specic for sanding operations:

1. Use proper sized sanding disc paper. Follow

manufacturers recommendations, when

selecting sanding paper. Larger sanding paper

extending too far beyond the sanding pad pres-

ents a laceration hazard and may cause snagging,

tearing of the disc or kickback.

Safety warnings specic for wire brushing

operations:

1. Be aware that wire bristles are thrown by the

brush even during ordinary operation. Do not

overstress the wires by applying excessive

load to the brush. The wire bristles can easily

penetrate light clothing and/or skin.

2. If the use of a guard is specied for wire

brushing, do not allow any interference of the

wire wheel or brush with the guard. Wire wheel

or brush may expand in diameter due to work load

and centrifugal forces.

Additional Safety Warnings:

1. When using depressed centre grinding wheels,

be sure to use only berglass-reinforced

wheels.

2. NEVER USE Stone Cup type wheels with this

grinder. This grinder is not designed for these

types of wheels and the use of such a product

may result in serious personal injury.

3. Be careful not to damage the spindle, the

ange (especially the installing surface) or the

lock nut. Damage to these parts could result in

wheel breakage.

4. Make sure the wheel is not contacting the

workpiece before the switch is turned on.

5. Before using the tool on an actual workpiece,

let it run for a while. Watch for vibration or

wobbling that could indicate poor installation

or a poorly balanced wheel.

6. Use the specied surface of the wheel to per-

form the grinding.

7. Do not leave the tool running. Operate the tool

only when hand-held.

8. Do not touch the workpiece immediately after

operation; it may be extremely hot and could

burn your skin.

9. Do not touch accessories immediately after

operation; it may be extremely hot and could

burn your skin.

10. Observe the instructions of the manufacturer

for correct mounting and use of wheels.

Handle and store wheels with care.

11. Do not use separate reducing bushings or

adaptors to adapt large hole abrasive wheels.

12. Use only anges specied for this tool.

13. For tools intended to be tted with threaded

hole wheel, ensure that the thread in the wheel

is long enough to accept the spindle length.

14. Check that the workpiece is properly

supported.

15. Pay attention that the wheel continues to

rotate after the tool is switched o.

16. If working place is extremely hot and humid,

or badly polluted by conductive dust, use a

short-circuit breaker (30 mA) to assure opera-

tor safety.

17. Do not use the tool on any materials contain-

ing asbestos.

18. When use cut-o wheel, always work with

the dust collecting wheel guard if required by

domestic regulation.

19. Cutting discs must not be subjected to any

lateral pressure.

20. Do not use cloth work gloves during operation.

Fibers from cloth gloves may enter the tool, which

causes tool breakage.

21. Before operation, make sure that there is no

buried object such as electric pipe, water pipe

or gas pipe in the workpiece. Otherwise, it may

cause an electric shock, electrical leakage or gas

leak.

22. If a blotter is attached to the wheel, do not

remove it. The diameter of the blotter must be

larger than the lock nut, outer ange, and inner

ange.

23. Before installing a grinding wheel, always

check that the blotter part does not have any

abnormalities such as chips or cracks.

24. Tighten the lock nut properly. Overtightening

the wheel can cause breakage and insucient

tightening can cause uttering.

SAVE THESE INSTRUCTIONS.

13 ENGLISH

WARNING: DO NOT let comfort or familiarity

with product (gained from repeated use) replace

strict adherence to safety rules for the subject

product. MISUSE or failure to follow the safety

rules stated in this instruction manual may cause

serious personal injury.

FUNCTIONAL

DESCRIPTION

CAUTION: Always be sure that the tool is

switched o and unplugged before adjusting or

checking function on the tool.

Tool protection system

The tool is equipped with a tool protection system. This

system automatically reduces or cuts o power to the

motor to extend tool life. The tool will automatically

reduce power or stop during operation if the tool is

placed under one of the following conditions:

Overload protection

When the tool is operated in a manner that causes it

to draw an abnormally high current, the tool reduces

power automatically without any indication. In this

situation, remove the cause of the overload so that the

rotation speed recovered.

Overheat protection

Country specic

When the tool is overheated, the tool stops automat-

ically and the indication lamp blinks in red. In this

situation, let the tool cool down. You can turn the tool

on again after the lamp changes the color from red to

green.

Indication lamp

► Fig.1: 1. Indication lamp

The indication lamp lights up green when the tool is

plugged.

If the indication lamp blinks in red, the overheat pro-

tection, Active Feedback sensing Technology, or the

accidental re-start preventive function stops operation.

In this situation, switch o the tool. Then, turn the tool

on to restart.

If the indication lamp lights up in red after switch o the

tool, the tool is overheated. In this situation, cool down

the tool and wait until the indication lamp lights up in

green.

Speed adjusting dial

Only for model GA4590 / GA4591 / GA5090 / GA5091

CAUTION: If the tool is operated continuously

at low speeds for a long time, the motor will get

overloaded and heated up.

CAUTION: The speed adjusting dial can be

turned only as far as 5 and back to 1. Do not force

it past 5 or 1, or the speed adjusting function may

no longer work.

The rotating speed can be changed by turning the

speed adjusting dial to a given number setting from 1 to

5. Higher speed is obtained when the dial is turned in

the direction of number 5. And lower speed is obtained

when it is turned in the direction of number 1. Refer to

the below table for the relationship between the number

settings on the dial and the approximate rotating speed.

Number Rated speed

12,800 min-1 (/min)

24,500 min-1 (/min)

36,500 min-1 (/min)

48,000 min-1 (/min)

511,500 min-1 (/min)

► Fig.2: 1. Speed adjusting dial

Shaft lock

WARNING: Never actuate the shaft lock when

the spindle is moving. It may cause serious injury or

the tool damage.

Press the shaft lock to prevent spindle rotation when

installing or removing accessories.

► Fig.3: 1. Shaft lock

Switch action

CAUTION: Before plugging in the tool, always

check to see that the slide switch actuates prop-

erly and returns to the “OFF” position when the

rear end of the slide switch is depressed.

CAUTION: Switch can be locked in the “ON”

position for ease of operator comfort during

extended use. Apply caution when locking tool

in the “ON” position and maintain rm grasp on

tool.

To start the tool, press down the rear end of the slide

switch and then slide it toward the “I (ON)” position.

For continuous operation, press down the front end of

the slide switch to lock it.

► Fig.4: 1. Slide switch

To stop the tool, press down the rear end of the slide

switch so that it returns to the “O (OFF)” position.

► Fig.5: 1. Slide switch

14 ENGLISH

Electronic function

Active Feedback sensing Technology

CAUTION: Hold the tool rmly until the rota-

tion stops.

The tool electronically detects situations where the

wheel or accessory may be at risk to be bound. In such

situation, the tool automatically shuts o the power to

prevent further rotation of the spindle (this does not

prevent kickback).

At this time, the indication lamp blinks in red and shows

the Active Feedback sensing Technology is working.

To restart the tool, switch o the tool rst, remove the

cause of sudden drop in the rotation speed, and then

turn the tool on.

Accidental re-start preventive

function

When plugging in the tool while the switch is ON, the

tool does not start.

At this time, the indication lamp blinks in red and shows

that the accidental re-start preventive function works.

To start the tool, turn o the switch, and turn it on again.

Constant speed control

Possible to get ne nish, because the rotating speed is

kept constant even under the loaded condition.

Soft start feature

Soft start feature reduces starting reaction.

Mechanical brake

Only for model GA4591 / GA5091

Mechanical brake is activated after the tool is switched

o.

The brake does not work when the power supply is shut

down with the switch still on.

ASSEMBLY

CAUTION: Always be sure that the tool is

switched o and unplugged before carrying out

any work on the tool.

Installing side grip (handle)

CAUTION: Always be sure that the side grip is

installed securely before operation.

Screw the side grip securely on the position of the tool

as shown in the gure.

► Fig.6

Installing or removing wheel guard

WARNING: When using a depressed center

wheel, ap disc, ex wheel or wire wheel brush,

the wheel guard must be tted on the tool so that

the closed side of the guard always points toward

the operator.

WARNING: Make sure that the wheel guard is

securely locked by the lock lever with one of the

holes on the wheel guard.

WARNING: When using an abrasive cut-o /

diamond wheel, be sure to use only the special

wheel guard designed for use with cut-o wheels.

For depressed center wheel, ap

disc, ex wheel, wire wheel brush /

abrasive cut-o wheel, diamond

wheel

1. While pushing the lock lever, mount the wheel

guard with the protrusions on the wheel guard aligned

with the notches on the bearing box.

► Fig.7: 1. Lock lever 2. Notch 3. Protrusion

2. While pushing the lock lever toward A, hold down

the portions B of the wheel guard as shown in the

gure.

► Fig.8: 1. Wheel guard 2. Hole

NOTE: Push down the wheel guard straight.

Otherwise, you cannot secure the wheel guard.

3. While pushing the lock lever toward A, rotate the

wheel guard toward C, and then, change the angle of

the wheel guard according to the work so that the oper-

ator can be protected. Align the lock lever with one of

the holes in the wheel guard, and then release the lock

lever to lock the wheel guard.

► Fig.9: 1. Wheel guard 2. Hole

To remove wheel guard, follow the installation proce-

dure in reverse.

Clip-on cutting wheel guard

attachment

Optional accessory

NOTE: For cutting-o operations, a clip-on cutting

wheel guard attachment can be used with the wheel

guard (for grinding wheel).

Not available in some countries.

► Fig.10

15 ENGLISH

Installing or removing depressed

center wheel or ap disc

Optional accessory

WARNING: When using a depressed center

wheel or ap disc, the wheel guard must be tted

on the tool so that the closed side of the guard

always points toward the operator.

WARNING: Make sure that the mounting part

of the inner ange ts into the inner diameter of

the depressed center wheel / ap disc perfectly.

Mounting the inner ange on the wrong side may

result in the dangerous vibration.

Mount the inner ange onto the spindle.

Make sure to t the dented part of the inner ange onto

the straight part at the bottom of the spindle.

Fit the depressed center wheel / ap disc on the inner

ange and screw the lock nut onto the spindle.

► Fig.11: 1. Lock nut 2. Depressed center wheel

3. Inner ange 4. Mounting part

To tighten the lock nut, press the shaft lock rmly so

that the spindle cannot revolve, then use the lock nut

wrench and securely tighten clockwise.

► Fig.12: 1. Lock nut wrench 2. Shaft lock

To remove the wheel, follow the installation procedure

in reverse.

Installing or removing ex wheel

Optional accessory

WARNING: Always use supplied guard when

ex wheel is on the tool. Wheel can shatter during

use and guard helps to reduce chances of personal

injury.

► Fig.13: 1. Lock nut 2. Flex wheel 3. Back up pad

4. Inner ange

Follow instructions for depressed center wheel but also

use back up pad over wheel.

Installing or removing abrasive disc

Optional accessory

► Fig.14: 1. Sanding lock nut 2. Abrasive disc

3. Rubber pad

1. Mount the rubber pad onto the spindle.

2. Fit the disc on the rubber pad and screw the sand-

ing lock nut onto the spindle.

3. Hold the spindle with the shaft lock, and securely

tighten the sanding lock nut clockwise with the lock nut

wrench.

To remove the disc, follow the installation procedure in

reverse.

NOTE: Use sander accessories specied in this man-

ual. These must be purchased separately.

Super ange

Optional accessory

Only for model GA4590 / GA4592 / GA5090 / GA5092

Super ange is a special accessory for model which is

NOT equipped with a brake function.

Only 1/3 of eorts needed to undo lock nut, compared

with conventional type.

Installing or removing Ezynut

Optional accessory

Only for tools with M14 spindle thread.

CAUTION: Do not use Ezynut with Super

Flange. Those anges are so thick that the entire

thread cannot be retained by the spindle.

Mount inner ange, abrasive wheel and Ezynut onto the

spindle so that Makita Logo on Ezynut faces outside.

► Fig.15: 1. Ezynut 2. Abrasive wheel 3. Inner ange

4. Spindle

Press shaft lock rmly and tighten Ezynut by turning the

abrasive wheel clockwise as far as it turns.

► Fig.16: 1. Shaft lock

To loosen the Ezynut, turn the outside ring of Ezynut

counterclockwise.

NOTE: Ezynut can be loosened by hand as long

as the arrow points the notch. Otherwise a lock nut

wrench is required to loosen it. Insert one pin of the

wrench into a hole and turn Ezynut counterclockwise.

► Fig.17: 1. Arrow 2. Notch

► Fig.18

Installing abrasive cut-o / diamond

wheel

Optional accessory

WARNING: When using an abrasive cut-o /

diamond wheel, be sure to use only the special

wheel guard designed for use with cut-o wheels.

WARNING: NEVER use cut-o wheel for side

grinding.

► Fig.19: 1. Lock nut 2. Abrasive cut-o wheel / dia-

mond wheel 3. Inner ange 4. Wheel guard

for abrasive cut-o wheel / diamond wheel

As for the installation, follow the instructions for

depressed center wheel.

The direction for mounting the lock nut and the inner

ange varies by wheel type and thickness.

Refer to the following gures.

When installing the abrasive cut-o wheel:

► Fig.20: 1. Lock nut 2. Abrasive cut-o wheel

(Thinner than 4 mm (5/32")) 3. Abrasive cut-

o wheel (4 mm (5/32") or thicker) 4. Inner

ange

When installing the diamond wheel:

► Fig.21: 1. Lock nut 2. Diamond wheel (Thinner than

4 mm (5/32")) 3. Diamond wheel (4 mm

(5/32") or thicker) 4. Inner ange

16 ENGLISH

Installing wire cup brush

Optional accessory

CAUTION: Do not use brush that is damaged,

or which is out of balance. Use of damaged brush

could increase potential for injury from contact with

broken brush wires.

Place the tool upside down to allow easy access to the

spindle.

Remove any accessories on spindle. Thread wire cup

brush onto spindle and tighten with supplied wrench.

► Fig.22: 1. Wire cup brush

Installing wire wheel brush

Optional accessory

CAUTION: Do not use wire wheel brush that

is damaged, or which is out of balance. Use of

damaged wire wheel brush could increase potential

for injury from contact with broken wires.

CAUTION: ALWAYS use guard with wire

wheel brushes, assuring diameter of wheel ts

inside guard. Wheel can shatter during use and

guard helps to reduce chances of personal injury.

Place the tool upside down to allow easy access to the

spindle.

Remove any accessories on spindle. Thread wire wheel

brush onto spindle and tighten with the wrenches.

► Fig.23: 1. Wire wheel brush

Installing hole cutter

Optional accessory

Place the tool upside down to allow easy access to the

spindle.

Remove any accessories on the spindle. Thread the

hole cutter onto the spindle, and tighten it with the sup-

plied wrench.

► Fig.24: 1. Hole cutter

Installing dust collecting wheel

guard for grinding

Optional accessory

With optional accessories, you can use this tool for

planing concrete surface.

CAUTION: Dust collecting wheel guard for

grinding is only for use in planing concrete sur-

face with a cup-type diamond wheel. Do not use

this guard with any other cutting accessory or for

any other purpose.

CAUTION: Before operation, make sure that

a vacuum cleaner is connected to the tool and

turned on.

Place the tool upside down and install the dust collect-

ing wheel guard.

Mount the inner ange onto the spindle.

Fit the cup-type diamond wheel on the inner ange and

tighten the lock nut onto the spindle.

► Fig.25: 1. Lock nut 2. Cup-type diamond wheel

3. Hubbed cup-type diamond wheel 4. Inner

ange 5. Dust collecting wheel guard

6. Bearing box

NOTE: For information how to install the dust col-

lecting wheel guard, refer to the manual of the dust

collecting wheel guard.

Installing dust collecting wheel

guard for cutting-o

Optional accessory

With optional accessories, you can use this tool for

cutting stone materials.

► Fig.26

NOTE: For information how to install the dust col-

lecting wheel guard, refer to the manual of the dust

collecting wheel guard.

Connecting a vacuum cleaner

Optional accessory

WARNING: Never vacuum metal particles

created by grinding/cutting/sanding operation.

Metal particles created by such operation are so hot

that they ignite dust and the lter inside the vacuum

cleaner.

To avoid dusty environment caused by masonry cut-

ting, use a dust collecting wheel guard and a vacuum

cleaner.

Refer to the instruction manual attached to the dust

collecting wheel guard for assembling and using it.

► Fig.27: 1. Dust collecting wheel guard 2. Hose of

the vacuum cleaner

Installing or removing dust cover

attachment

Optional accessory

CAUTION: Always be sure that the tool is

switched o and unplugged before installing or

removing the dust cover attachment. Failure to do

so causes damage to the tool or a personal injury.

Install the dust cover attachment to each specied

position.

For details, refer to the instruction manual of the dust

cover attachment.

NOTICE: Clean out the dust cover attachment

when it is clogged with dust or foreign matters.

Continuing operation with a clogged dust cover

attachment will damage the tool.

17 ENGLISH

OPERATION

WARNING: It should never be necessary to

force the tool. The weight of the tool applies ade-

quate pressure. Forcing and excessive pressure

could cause dangerous wheel breakage.

WARNING: ALWAYS replace wheel if tool is

dropped while grinding.

WARNING: NEVER hit the workpiece with the

wheel.

WARNING: Avoid bouncing and snagging

the wheel, especially when working corners,

sharp edges etc. This can cause loss of control and

kickback.

WARNING: NEVER use tool with wood cutting

blades and other saw blades. Such blades when

used on a grinder frequently kick and cause loss of

control leading to personal injury.

WARNING: Continued use of a worn-out

wheel may result in wheel explosion and serious

personal injury.

CAUTION: Never switch on the tool when it

is in contact with the workpiece, it may cause an

injury to operator.

CAUTION: Always wear safety goggles or a

face shield during operation.

CAUTION: After operation, always switch o

the tool and wait until the wheel has come to a

complete stop before putting the tool down.

CAUTION: ALWAYS hold the tool rmly with

one hand on housing and the other on the side

grip (handle).

NOTE: A dual purpose wheel can be used for both

grinding and cutting-o operations.

Refer to the “Operation with wheel/disc” for grinding

operation, and refer to the “Operation with abrasive

cut-o / diamond wheel” for cutting-o operation.

Operation with wheel/disc

► Fig.28

Turn the tool on and then apply the wheel or disc to the

workpiece.

In general, keep the edge of the wheel or disc at an

angle of about 15° to the workpiece surface.

During the break-in period with a new wheel, do not

work the grinder in forward direction or it may cut into

the workpiece. Once the edge of the wheel has been

rounded o by use, the wheel may be worked in both

forward and backward direction.

Operation with abrasive cut-o /

diamond wheel

Optional accessory

WARNING: Do not “jam” the wheel or apply

excessive pressure. Do not attempt to make an

excessive depth of cut. Overstressing the wheel

increases the loading and susceptibility to twisting

or binding of the wheel in the cut and the possibility

of kickback, wheel breakage and overheating of the

motor may occur.

WARNING: Do not start the cutting operation

in the workpiece. Let the wheel reach full speed

and carefully enter into the cut moving the tool

forward over the workpiece surface. The wheel

may bind, walk up or kickback if the power tool is

started in the workpiece.

WARNING: During cutting operations, never

change the angle of the wheel. Placing side pres-

sure on the cut-o wheel (as in grinding) will cause

the wheel to crack and break, causing serious per-

sonal injury.

WARNING: A diamond wheel shall be oper-

ated perpendicular to the material being cut.

Usage example: operation with abrasive cut-o

wheel

► Fig.29

Usage example: operation with diamond wheel

► Fig.30

Operation with wire cup brush

Optional accessory

CAUTION: Check operation of brush by run-

ning tool with no load, insuring that no one is in

front of or in line with brush.

Usage example: operation with wire cup brush

► Fig.31

NOTICE: Avoid applying too much pressure

which causes over bending of wires when using

brush. It may lead to premature breakage.

Operation with wire wheel brush

Optional accessory

CAUTION: Check operation of wire wheel

brush by running tool with no load, insuring that

no one is in front of or in line with the wire wheel

brush.

Usage example: operation with wire wheel brush

► Fig.32

NOTICE: Avoid applying too much pressure

which causes over bending of wires when

using wire wheel brush. It may lead to premature

breakage.

18 ENGLISH

Operation with hole cutter

Optional accessory

CAUTION: Check operation of the hole cutter

by running the tool with no load, insuring that no

one is in front of the hole cutter.

NOTICE: Do not tilt the tool during operation. It

may lead to premature breakage.

Usage example: operation with hole cutter

► Fig.33

MAINTENANCE

CAUTION: Always be sure that the tool is

switched o and unplugged before attempting to

perform inspection or maintenance.

NOTICE: Never use gasoline, benzine, thinner,

alcohol or the like. Discoloration, deformation or

cracks may result.

To maintain product SAFETY and RELIABILITY,

repairs, any other maintenance or adjustment should

be performed by Makita Authorized or Factory Service

Centers, always using Makita replacement parts.

Air vent cleaning

The tool and its air vents have to be kept clean.

Regularly clean the tool's air vents or whenever the

vents start to become obstructed.

► Fig.34: 1. Exhaust vent 2. Inhalation vent

COMBINATION OF APPLICATIONS AND

ACCESSORIES

Optional accessory

CAUTION: Using the tool with incorrect guards can cause risks as follows.

• When using a cut-o wheel guard for facial grinding, the wheel guard may interfere with the work-

piece causing poor control.

• When using a grinding wheel guard for cutting-o operations with bonded abrasive wheels and dia-

mond wheels, there is an increased risk of exposure to rotating wheels, emitted sparks and particles,

as well as exposure to wheel fragments in the event of wheel burst.

• When using a cut-o wheel guard or grinding wheel guard for facial operations with cup-type dia-

mond wheels, the wheel guard may interfere with the workpiece causing poor control.

• When using a cut-o wheel guard or grinding wheel guard with a wheel-type wire brush with a thick-

ness greater than the maximum thickness as specied in “SPECIFICATIONS”, the wires may catch on

the guard leading to breaking of wires.

• Use of dust collecting wheel guards for cutting-o and facial operations in concrete or masonry

reduces a risk of exposure to dust.

• When using dual purpose (combined grinding and cutting-o abrasive) ange mounted wheels, only

use a cut-o wheel guard.

► Fig.35

Only for model GA4590 / GA4592 / GA5090 / GA5092

-Application 115 mm (4-1/2") model 125 mm (5") model

1 - Side grip

2 - Wheel Guard (for grinding wheel)

3 - Inner ange / Super ange *1*2

4Grinding / Sanding Depressed center wheel / Flap disc

5 - Lock nut

6 - Ezynut *1*2

7 - Back up pad

8Grinding / Sanding Flex wheel

9 - Rubber pad 100 Rubber pad 115

10 Sanding Abrasive disc

11 -Sanding lock nut

19 ENGLISH

-Application 115 mm (4-1/2") model 125 mm (5") model

12 Wire brushing Wire wheel brush

13 Wire brushing Wire cup brush

14 Hole cutting Hole cutter

15 -Wheel Guard (for cut-o wheel)

16 Cutting-o Abrasive cut-o wheel / Diamond wheel

17 Grinding / Cutting-o Dual purpose wheel

18 -Clip-on cutting wheel guard attachment *3

19 -Dust collecting wheel guard for cutting-o

20 Cutting-o Diamond wheel

21 -Dust collecting wheel guard for grinding

22 Grinding Cup-type diamond wheel

- - Lock nut wrench

- - Dust cover attachment

Only for model GA4591 / GA5091

-Application 115 mm (4-1/2") model 125 mm (5") model

1 - Side grip

2 - Wheel Guard (for grinding wheel)

3 - Inner ange

4Grinding / Sanding Depressed center wheel / Flap disc

5 - Lock nut

6 - Ezynut *1*2

7 - Back up pad

8Grinding / Sanding Flex wheel

9 - Rubber pad 100 Rubber pad 115

10 Sanding Abrasive disc

11 -Sanding lock nut

12 Wire brushing Wire wheel brush

13 Wire brushing Wire cup brush

14 Hole cutting Hole cutter

15 -Wheel Guard (for cut-o wheel)

16 Cutting-o Abrasive cut-o wheel / Diamond wheel

17 Grinding / Cutting-o Dual purpose wheel

18 -Clip-on cutting wheel guard attachment *3

19 -Dust collecting wheel guard for cutting-o

20 Cutting-o Diamond wheel

21 -Dust collecting wheel guard for grinding

22 Grinding Cup-type diamond wheel

- - Lock nut wrench

- - Dust cover attachment

NOTE: *1 Do not use Super ange and Ezynut together.

NOTE: *2 Only for tools with M14 spindle thread.

NOTE: *3 Clip-on cutting wheel guard attachment is not available in some countries. For more details, refer to the

instruction manual of the clip-on cutting wheel guard attachment.

NOTE: Do not use Super ange with a grinder equipped with a brake function.

20

OPTIONAL

ACCESSORIES

CAUTION: These accessories or attachments

are recommended for use with your Makita tool

specied in this manual. The use of any other

accessories or attachments might present a risk of

injury to persons. Only use accessory or attachment

for its stated purpose.

If you need any assistance for more details regard-

ing these accessories, ask your local Makita Service

Center.

• Accessories listed in “COMBINATION OF

APPLICATIONS AND ACCESSORIES”

NOTE: Some items in the list may be included in the

tool package as standard accessories. They may

dier from country to country.

ENGLISH

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Makita GA4590 ユーザーマニュアル

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