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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-off 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 specific) | ||||||
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 | ![]() |
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-off operations. |
![]() | DOUBLE INSULATION |
![]() | Only for EU countries Due to the presence of hazardous components 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 equipment 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 accordance with the environmental protection regulations. This is indicated by the symbol of the crossed-out wheeled bin placed on the equipment. |
The tool is intended for grinding, sanding, wire brushing, hole cutting and cutting of metal and stone materials without the use of water.
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.
The typical A-weighted noise level determined according to EN62841-2-3:
Model | Sound pressure level (LpA): (dB(A)) | Sound power level (LWA): (dB(A)) | Uncertainty (K): (dB(A)) |
GA4590 | 93 | 101 | 3 |
GA4591 | 90 | 98 | 3 |
GA4592 | 93 | 101 | 3 |
GA5090 | 93 | 101 | 3 |
GA5091 | 90 | 98 | 3 |
GA5092 | 93 | 101 | 3 |
NOTE: The declared noise emission value(s) has been measured in accordance with a standard test method and may be used for comparing one tool with another. NOTE: The declared noise emission value(s) may also be used in a preliminary assessment of exposure. | |||
Set heavy flexible damping mats or such to those workpieces to prevent them from emitting sound. Take the increased noise emission into consideration for both the risk assessment of noise exposure and selecting adequate hearing protection. |
The vibration total value (tri-axial vector sum) determined according to EN62841-2-3:
Work mode: surface grinding with normal side grip
Model | Vibration emission (ah, AG): (m/s2) | Uncertainty (K): (m/s2) |
GA4590 | 4.7 | 1.5 |
GA4591 | 5.4 | 1.5 |
GA4592 | 4.7 | 1.5 |
GA5090 | 7.9 | 1.5 |
GA5091 | 7.4 | 1.5 |
GA5092 | 7.9 | 1.5 |
Work mode: surface grinding with anti vibration side grip
Model | Vibration emission (ah, AG): (m/s2) | Uncertainty (K): (m/s2) |
GA4590 | 4.9 | 1.5 |
GA4591 | 5.2 | 1.5 |
GA4592 | 4.9 | 1.5 |
GA5090 | 8.8 | 1.5 |
GA5091 | 8.7 | 1.5 |
GA5092 | 8.8 | 1.5 |
Work mode: disc sanding with normal side grip
Model | Vibration emission (ah, DS): (m/s2) | Uncertainty (K): (m/s2) |
GA4590 | 3.6 | 1.5 |
GA4591 | 3.2 | 1.5 |
GA4592 | 3.6 | 1.5 |
GA5090 | 2.7 | 1.5 |
GA5091 | 2.7 | 1.5 |
GA5092 | 2.7 | 1.5 |
Work mode: disc sanding with anti vibration side grip
Model | Vibration emission (ah, DS): (m/s2) | Uncertainty (K): (m/s2) |
GA4590 | 3.5 | 1.5 |
GA4591 | 2.9 | 1.5 |
GA4592 | 3.5 | 1.5 |
GA5090 | 2.8 | 1.5 |
GA5091 | 3.0 | 1.5 |
GA5092 | 2.8 | 1.5 |
NOTE: The declared vibration total value(s) has been measured in accordance with a standard test method and may be used for comparing one tool with another. NOTE: The declared vibration total value(s) may also be used in a preliminary assessment of exposure. | ||
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Read all safety warnings, instructions, illustrations and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury. |
Save all warnings and instructions for future reference.
The term "power tool" in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
Safety warnings common for grinding, sanding, wire brushing, or cutting-off operations:
Kickback and related warnings:
Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing pad, brush or any other accessory. Pinching or snagging causes rapid stalling of the rotating accessory which in turn causes the uncontrolled 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 movement 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.
Safety warnings specific for grinding and cutting-off operations:
Additional safety warnings specific for cutting-off operations:
Safety warnings specific for sanding operations:
Safety warnings specific for wire brushing operations:
Additional Safety Warnings:
SAVE THESE INSTRUCTIONS.
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. |
Always be sure that the tool is switched off and unplugged before adjusting or checking function on the tool. |
The tool is equipped with a tool protection system. This system automatically reduces or cuts off 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:
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.
Country specific
When the tool is overheated, the tool stops automatically 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.
► Fig.1:
The indication lamp lights up green when the tool is plugged.
If the indication lamp blinks in red, the overheat protection, Active Feedback sensing Technology, or the accidental re-start preventive function stops operation. In this situation, switch off the tool. Then, turn the tool on to restart.
If the indication lamp lights up in red after switch off the tool, the tool is overheated. In this situation, cool down the tool and wait until the indication lamp lights up in green.
Only for model GA4590 / GA4591 / GA5090 / GA5091
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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 |
1 | 2,800 min-1 (/min) |
2 | 4,500 min-1 (/min) |
3 | 6,500 min-1 (/min) |
4 | 8,000 min-1 (/min) |
5 | 11,500 min-1 (/min) |
► Fig.2:
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:
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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:
To stop the tool, press down the rear end of the slide switch so that it returns to the "O (OFF)" position.
► Fig.5:
Hold the tool firmly until the rotation 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 off 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 off the tool first, remove the cause of sudden drop in the rotation speed, and then turn the tool on.
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 off the switch, and turn it on again.
Possible to get fine finish, because the rotating speed is kept constant even under the loaded condition.
Soft start feature reduces starting reaction.
Only for model GA4591 / GA5091
Mechanical brake is activated after the tool is switched off.
The brake does not work when the power supply is shut down with the switch still on.
Always be sure that the tool is switched off and unplugged before carrying out any work on the tool. |
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 figure.
► Fig.6
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To remove wheel guard, follow the installation procedure in reverse.
Optional accessory
NOTE: For cutting-off 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
Optional accessory
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Mount the inner flange onto the spindle.
Make sure to fit the dented part of the inner flange onto the straight part at the bottom of the spindle.
Fit the depressed center wheel / flap disc on the inner flange and screw the lock nut onto the spindle.
► Fig.11:
To tighten the lock nut, press the shaft lock firmly so that the spindle cannot revolve, then use the lock nut wrench and securely tighten clockwise.
► Fig.12:
To remove the wheel, follow the installation procedure in reverse.
Optional accessory
Always use supplied guard when flex wheel is on the tool. Wheel can shatter during use and guard helps to reduce chances of personal injury. |
► Fig.13:
Follow instructions for depressed center wheel but also use back up pad over wheel.
Optional accessory
► Fig.14:
To remove the disc, follow the installation procedure in reverse.
NOTE: Use sander accessories specified in this manual. These must be purchased separately.
Optional accessory
Only for model GA4590 / GA4592 / GA5090 / GA5092
Super flange is a special accessory for model which is NOT equipped with a brake function.
Only 1/3 of efforts needed to undo lock nut, compared with conventional type.
Optional accessory
Only for tools with M14 spindle thread.
Do not use Ezynut with Super Flange. Those flanges are so thick that the entire thread cannot be retained by the spindle. |
Mount inner flange, abrasive wheel and Ezynut onto the spindle so that Makita Logo on Ezynut faces outside.
► Fig.15:
Press shaft lock firmly and tighten Ezynut by turning the abrasive wheel clockwise as far as it turns.
► Fig.16:
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:
► Fig.18
Optional accessory
|
► Fig.19:
As for the installation, follow the instructions for depressed center wheel.
The direction for mounting the lock nut and the inner flange varies by wheel type and thickness.
Refer to the following figures.
When installing the abrasive cut-off wheel:
► Fig.20:
When installing the diamond wheel:
► Fig.21:
Optional accessory
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:
Optional accessory
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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:
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 supplied wrench.
► Fig.24:
Optional accessory
With optional accessories, you can use this tool for planing concrete surface.
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Place the tool upside down and install the dust collecting wheel guard.
Mount the inner flange onto the spindle.
Fit the cup-type diamond wheel on the inner flange and tighten the lock nut onto the spindle.
► Fig.25:
NOTE: For information how to install the dust collecting wheel guard, refer to the manual of the dust collecting wheel guard.
Optional accessory
With optional accessories, you can use this tool for cutting stone materials.
► Fig.26
NOTE: For information how to install the dust collecting wheel guard, refer to the manual of the dust collecting wheel guard.
Optional accessory
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 filter inside the vacuum cleaner. |
To avoid dusty environment caused by masonry cutting, 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:
Optional accessory
Always be sure that the tool is switched off 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 specified 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.
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NOTE: A dual purpose wheel can be used for both grinding and cutting-off operations. Refer to the "Operation with wheel/disc" for grinding operation, and refer to the "Operation with abrasive cut-off / diamond wheel" for cutting-off operation. |
► 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 off by use, the wheel may be worked in both forward and backward direction.
Optional accessory
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Usage example: operation with abrasive cut-off wheel
► Fig.29
Usage example: operation with diamond wheel
► Fig.30
Optional accessory
Check operation of brush by running 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.
Optional accessory
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.
Optional accessory
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
Always be sure that the tool is switched off 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.
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:
Optional accessory
Using the tool with incorrect guards can cause risks as follows.
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► 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 flange / Super flange *1*2 | |
4 | Grinding / Sanding | Depressed center wheel / Flap disc | |
5 | - | Lock nut | |
6 | - | Ezynut *1*2 | |
7 | - | Back up pad | |
8 | Grinding / 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-off wheel) | |
16 | Cutting-off | Abrasive cut-off wheel / Diamond wheel | |
17 | Grinding / Cutting-off | Dual purpose wheel | |
18 | - | Clip-on cutting wheel guard attachment *3 | |
19 | - | Dust collecting wheel guard for cutting-off | |
20 | Cutting-off | 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 flange | |
4 | Grinding / Sanding | Depressed center wheel / Flap disc | |
5 | - | Lock nut | |
6 | - | Ezynut *1*2 | |
7 | - | Back up pad | |
8 | Grinding / 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-off wheel) | |
16 | Cutting-off | Abrasive cut-off wheel / Diamond wheel | |
17 | Grinding / Cutting-off | Dual purpose wheel | |
18 | - | Clip-on cutting wheel guard attachment *3 | |
19 | - | Dust collecting wheel guard for cutting-off | |
20 | Cutting-off | 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 flange 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 flange with a grinder equipped with a brake function.
These accessories or attachments are recommended for use with your Makita tool specified 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 regarding these accessories, ask your local Makita Service Center.
NOTE: Some items in the list may be included in the tool package as standard accessories. They may differ from country to country.
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
Download Makita GA4590; GA4591; GA4592; GA5090; GA5091; GA5092 - Angle Grinder Manual
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