Makita DTW284 Cordless Impact Wrench Instruction Manual

DTW284 Cordless Impact Wrench
Instruction Manual

SPECIFICATIONS

• Due to our continuing program of research and development, the specifications herein are subject to change without notice.
• Specifications may differ from country to country.
• The weight may differ depending on the attachment(s), including the battery cartridge. The lightest and heaviest combinations, according to EPTA-Procedure 01/2014, are shown in the table.

Applicable battery cartridge and charger

• Some of the battery cartridges and chargers listed above may not be available depending on your region of residence.
WARNING: Only use the battery cartridges and chargers listed above. Use of any other battery cartridges and chargers may cause injury and/or fire.

Intended use
The tool is intended for fastening bolts and nuts.
Noise
The typical A-weighted noise level is determined according to EN62841-2-2:
Sound pressure level (LpA): 96 dB (A)
Sound power level (LWA): 107 dB (A)
Uncertainty (K): 3 dB (A)
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.
WARNING: Wear ear protection.
WARNING: The noise emission during actual use of the power tool can differ from the declared value(s) depending on the ways in which the tool is used especially what kind of workpiece is processed.
WARNING: Be sure to identify safety measures to protect the operator that is based on an estimation of exposure in the actual conditions of use (taking account of all parts of the operating cycle such as the times when the tool is switched off and when it is running idle in addition to the trigger time).

Vibration
The vibration total value (tri-axial vector sum) is determined according to EN62841-2-2:
Model DTW284
Work mode: impact tightening of fasteners of the maximum capacity of the tool
Vibration emission (ah) : 14.0 m/s 2
Uncertainty (K): 1.5 m/s 2

Model DTW285
Work mode: impact tightening of fasteners of the maximum capacity of the tool
Vibration emission (ah): 11.5 m/s 2
Uncertainty (K): 1.5 m/s 2
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.
WARNING: The vibration emission during actual use of the power tool can differ from the declared value(s) depending on the ways in which the tool is used especially what kind of workpiece is processed.
WARNING: Be sure to identify safety measures to protect the operator that is based on an estimation of exposure in the actual conditions of use (taking account of all parts of the operating cycle such as the times when the tool is switched off and when it is running idle in addition to the trigger time).

EC Declaration of Conformity
For European countries only
The EC declaration of conformity is included as Annex A to this instruction manual.

SAFETY WARNINGS

General power tool safety warnings
WARNING: 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.
Cordless impact wrench safety warnings

1. Hold the power tool by insulated gripping surfaces, when performing an operation where the fastener may contact hidden wiring. Fasteners contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator an electric shock.
2. Wear ear protectors.
3. Check the impact socket carefully for wear, cracks, or damage before installation.
4. Hold the tool firmly.
5. Keep hands away from rotating parts.
6. Do not touch the impact socket, bolt, nut, or workpiece immediately after operation. They may be extremely hot and could burn your skin.
7. Always be sure you have a firm footing. Be sure no one is below when using the tool in high locations.
8. The proper fastening torque may differ depending upon the kind or size of the bolt. Check the torque with a torque wrench.
9. Make sure there are no electrical cables, water pipes, gas pipes, etc. that could cause a hazard if damaged by the use of the tool.

WARNING: DO NOT let comfort or familiarity with the 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.
Important safety instructions for battery cartridge

1. Before using the battery cartridge, read all instructions and cautionary markings on (1) battery charger, (2) battery, and (3) product using the battery.
2. Do not disassemble or tamper with the battery cartridge. It may result in a fire, excessive heat, or explosion.
3. If the operating time has become excessively shorter, stop operating immediately. It may result in a risk of overheating, possible burns, and even an explosion.
4. If electrolyte gets into your eyes, rinse them out with clear water and seek medical attention right away. It may result in loss of your eyesight.
5. Do not short the battery cartridge:
   (1). Do not touch the terminals with any conductive material.
   (2). Avoid storing the battery cartridge in a container with other metal objects such as nails, coins, etc.
   (3). Do not expose the battery cartridge to water or rain.
   A battery short can cause a large current flow, overheating, possible burns, and even a breakdown.
6. Do not store and use the tool and battery cartridge in locations where the temperature may reach or exceed 50 °C (122 °F).
7. Do not incinerate the battery cartridge even if it is severely damaged or is completely worn out. The battery cartridge can explode in a fire.
8. Do not nail, cut, crush, throw, drop the battery cartridge, or hit a hard object to the battery cartridge. Such conduct may result in a fire, excessive heat, or explosion.
9. Do not use a damaged battery. 
10. The contained lithium-ion batteries are subject to the Dangerous Goods Legislation requirements. For commercial transports e.g. by third parties or forwarding agents, the special requirements on packaging and labeling must be observed. For the preparation of the item being shipped, consulting an expert for hazardous material is required. Please also observe possibly more detailed national regulations. Tape or mask off open contacts and pack up the battery in such a manner that it cannot move around in the packaging.
11. When disposing of the battery cartridge, remove it from the tool and dispose of it in a safe place. Follow your local regulations relating to the disposal of batteries.
12. Use the batteries only with the products specified by Makita. Installing the batteries to non-compliant products may result in a fire, excessive heat, explosion, or leak of electrolyte.
13. If the tool is not used for a long period of time, the battery must be removed from the tool.
14. During and after use, the battery cartridge may take on heat which can cause burns or low-temperature burns. Pay attention to the handling of hot battery cartridges. 
15. Do not touch the terminal of the tool immediately after use as it may get hot enough to cause burns.
16. Do not allow chips, dust, or soil to stuck into the terminals, holes, and grooves of the battery cartridge. It may cause heating, catching fire, burst, and malfunction of the tool or battery cartridge, resulting in burns or personal injury.
17. Unless the tool supports the use of near high-voltage electrical power lines, do not use the battery cartridge near high-voltage electrical power lines. It may result in a malfunction or breakdown of the tool or battery cartridge.
18. Keep the battery away from children.

SAVE THESE INSTRUCTIONS.
CAUTION: Only use genuine Makita batteries. Use of non-genuine Makita batteries, or batteries that have been altered, may result in the battery bursting causing fires, personal injury, and damage. It will also void the Makita warranty for the Makita tool and charger.

Tips for maintaining maximum battery life

1. Charge the battery cartridge before completely discharged. Always stop tool operation and charge the battery cartridge when you notice less tool power.
2. Never recharge a fully charged battery cartridge. Overcharging shortens the battery service life.
3. Charge the battery cartridge at room temperature at 10 °C – 40 °C (50 °F – 104 °F). Let a hot battery cartridge cool down before charging it.
4. When not using the battery cartridge, remove it from the tool or the charger.
5. Charge the battery cartridge if you do not use it for a long period (more than six months).

FUNCTIONAL DESCRIPTION

CAUTION: Always be sure that the tool is switched off and the battery cartridge is removed before adjusting or checking the function of the tool.
Installing or removing the battery cartridge
CAUTION: Always switch off the tool before installing or removing the battery cartridge.
CAUTION: Hold the tool and the battery cartridge firmly when installing or removing the battery cartridge. Failure to hold the tool and the battery cartridge firmly may cause them to slip off your hands and result in damage to the tool and battery cartridge and a personal injury.
► Fig.1: 1. Red indicator 2. Button 3. Battery cartridge
To remove the battery cartridge, slide it from the tool while sliding the button on the front of the cartridge.
To install the battery cartridge, align the tongue on the battery cartridge with the groove in the housing and slip it into place. Insert it all the way until it locks in place with a little click. If you can see the red indicator as shown in the figure, it is not locked completely.
CAUTION: Always install the battery cartridge fully until the red indicator cannot be seen. If not, it may accidentally fall out of the tool, causing injury to you or someone around you.
CAUTION: Do not install the battery cartridge forcibly. If the cartridge does not slide in easily, it is not being inserted correctly.
Tool/battery protection system
The tool is equipped with a tool/battery protection system. This system automatically cuts off the power to extend tool and battery life. The tool will automatically stop during operation if the tool or battery is placed under one of the following conditions:
Overload protection
This protection works when the tool is operated in a manner that causes it to draw an abnormally high current. In this situation, turn the tool off and stop the application that caused the tool to become overloaded. Then turn the tool on to restart.
Overheat protection
This protection works when the tool or battery is overheated. In this situation, let the tool and battery cool before turning the tool on again.
Over-discharge protection
This protection works when the remaining battery capacity gets low. In this situation, remove the battery from the tool and charge the battery.
Indicating the remaining battery capacity
Only for battery cartridges with the indicator
► Fig.2: 1. Indicator lamps 2. Check button
Press the check button on the battery cartridge to indicate the remaining battery capacity. The indicator lamps light up for a few seconds.

NOTE: Depending on the conditions of use and the ambient temperature, the indication may differ slightly from the actual capacity.
NOTE: The first (far left) indicator lamp will blink when the battery protection system works.

Indicating the remaining battery capacity
Country specific
► Fig.3: 1. Battery indicator
When you pull the switch trigger, the LED display shows the remaining battery capacity. The remaining battery capacity is shown in the following table.

NOTE: When the LED display goes off, the tool is turned off to save the battery power. To check the remaining battery capacity, slightly pull the switch trigger.
NOTE: The LED display goes off approximately one minute after releasing the switch trigger.
NOTE: When the LED display lights up and the tool stops even with a recharged battery cartridge, cool down the tool fully. If the status will not change, stop using it and have the tool repaired by a Makita local service center.
NOTE: When the tool is overheated, the light flashes for one minute, and then the LED display goes off. In this case, cool down the tool before operating again.
Switch action
► Fig.4: 1. Switch trigger
CAUTION: Before installing the battery cartridge into the tool, always check to see that the switch trigger actuates properly and returns to the “OFF” position when released.
To start the tool, simply pull the switch trigger. Tool speed is increased by increasing pressure on the switch trigger. Release the switch trigger to stop.
NOTE: The tool automatically stops when you keep pulling the switch trigger for 3 minutes. Lighting up the front lamp
  CAUTION: Do not look in the light or see the source of light directly.
► Fig.5: 1. Lamp
► Fig.6: 1. Button
To turn on the lamp status, press the button for one second. To turn off the lamp status, press the button for one second again.
With the lamp status ON, pull the switch trigger to turn on the lamp. To turn it off, release it. The lamp goes out approximately 10 seconds after releasing the switch trigger.
With the lamp status OFF, the lamp does not turn on even if pulling the trigger.
NOTE: To confirm the lamp status, pull the trigger. When the lamp lights up by pulling the switch trigger, the lamp status is ON. When the lamp does not come on, the lamp status is OFF.
NOTE: Use a dry cloth to wipe the dirt off the lens of the lamp. Be careful not to scratch the lens or the lamp, or it may lower the illumination.
NOTE: While pulling the switch trigger, the lamp status cannot be changed.
NOTE: For approximately 10 seconds after releasing the switch trigger, the lamp status can be changed.

Reversing switch action
► Fig.7: 1. Reversing switch lever
CAUTION: Always check the direction of rotation before operation.
CAUTION: Use the reversing switch only after the tool comes to a complete stop. Changing the direction of rotation before the tool stops may damage the tool.
CAUTION: When not operating the tool, always set the reversing switch lever to the neutral position. 
This tool has a reversing switch to change the direction of rotation. Depress the reversing switch lever from the A-side for clockwise rotation or from the B-side for counterclockwise rotation.
When the reversing switch lever is in the neutral position, the switch trigger cannot be pulled.

Changing the impact force/mode
► Fig.8: 1. Changed in four steps 2. Hard impact mode 3. Medium impact mode 4. Soft impact mode 5. Reverse rotation auto-stop mode 6. Button
You can change the impact mode in four steps: hard, medium, soft, and reverse rotation auto-stop mode. To select the step, press the button .
You can change the impact force within approximately one minute after releasing the switch trigger.
Hard, Medium, and Soft impact modes allow a tightening suitable to the work.
The function of reverse rotation auto stop mode works only by pulling the trigger fully in counterclockwise tool rotation. When the bolt/nut gets enough loosened, the tool stops the impact and rotation.
Specifications of each impact force grade

NOTE: Reverse rotation auto stop mode is available only when the tool rotates counterclockwise. When rotating clockwise in reverse rotation auto-stop mode, the impact force and speed are the same as in Hard impact mode.

ASSEMBLY

CAUTION: Always be sure that the tool is switched off and the battery cartridge is removed before carrying out any work on the tool.
Selecting the correct impact socket
Always use the correct size impact socket for bolts and nuts. An incorrect size impact socket will result in inaccurate and inconsistent fastening torque and/or damage to the bolt or nut.
Installing or removing the impact socket
Optional accessory
CAUTION: Make sure that the impact socket and the mounting portion are not damaged before installing the impact socket.
CAUTION: After inserting the impact socket, make sure that it is firmly secured. If it comes out, do not use it.
NOTE: The way of impact socket installation varies depending on the type of square drive on the tool.
A tool with the ring spring
For impact socket without O-ring and pin
► Fig.9: 1. Impact socket 2. Square drive 3. Ring spring
Push the impact socket onto the square drive until it locks into place.
To remove the impact socket, simply pull it off.
For impact socket with O-ring and pin
► Fig.10: 1. Impact socket 2. O-ring 3. Pin
Move the O-ring out of the groove in the impact socket and remove the pin from the impact socket. Fit the impact socket onto the square drive so that the hole in the impact socket is aligned with the hole in the square drive.
Insert the pin through the hole in the impact socket and square drive. Then return the O-ring to the original position in the impact socket groove to retain the pin.
To remove the impact socket, follow the installation procedures in reverse.
A tool with the detent pin
► Fig.11: 1. Impact socket 2. Hole 3. Square drive 4.
Detent pin Align the hole in the side of the impact socket with the detent pin on the square drive and push the impact socket onto the square drive until it locks into place. Tap it lightly if required.
To remove the impact socket, simply pull it off. If it is hard to remove, depress the detent pin while pulling the impact socket.

Installing hook
WARNING: Use the hanging/mounting parts for their intended purposes only, e.g., hanging the tool on a tool belt between jobs or work intervals.
WARNING: Be careful not to overload the hook as too much force or irregular overburden may cause damage to the tool resulting in personal injury.
CAUTION: When installing the hook, always secure it with the screw firmly. If not, the hook may come off from the tool and result in personal injury.
CAUTION: Make sure to hang the tool securely before releasing your hold. Insufficient or unbalanced hooking may cause falling off and you may be injured.
► Fig.12: 1. Groove 2. Hook 3. Screw
The hook is convenient for temporarily hanging the tool. This can be installed on either side of the tool. To install the hook, insert it into a groove in the tool housing on either side and then secure it with a screw. To remove, loosen the screw and then take it out. Using hole
WARNING: Never use the hanging hole for unintended purposes, for instance, tethering the tool at a high location. Bearing stress is a heavily loaded hole may cause damage to the hole, resulting in injuries to you or people around or below you.
► Fig.13: 1. Hanging hole
Use the hanging hole at the bottom rear of the tool to hang the tool on a wall using a hanging cord or similar strings.

OPERATION

CAUTION: Always insert the battery cartridge all the way until it locks in place. If you can see the red indicator on the upper side of the button, it is not locked completely. Insert it fully until the red indicator cannot be seen. If not, it may accidentally fall out of the tool, causing injury to you or someone around you.
► Fig.14
Hold the tool firmly and place the impact socket over the bolt or nut. Turn the tool on and fasten for the proper fastening time.
The proper fastening torque may differ depending upon the kind or size of the bolt, the material of the workpiece to be fastened, etc. The relation between fastening torque and fastening time is shown in the figures.
Model DTW284
Proper fastening torque for a standard bolt 

Proper fastening torque for high tensile bolt 

Model DTW285
Proper fastening torque for a standard bolt  Proper fastening torque for a high tensile bolt NOTE: Hold the tool pointed straight at the bolt or nut.
NOTE: Excessive fastening torque may damage the bolt/nut or impact socket. Before starting your job, always perform a test operation to determine the proper fastening time for your bolt or nut.
NOTE: If the tool is operated continuously until the battery cartridge has discharged, allow the tool to rest for 15 minutes before proceeding with a fresh battery cartridge.
The fastening torque is affected by a wide variety of factors including the following. After fastening, always check the torque with a torque wrench.

1. When the battery cartridge is discharged almost completely, the voltage will drop and the fastening torque will be reduced.
2. Impact socket
   • Failure to use the correct size impact socket will cause a reduction in the fastening torque.
   • A worn impact socket (wear on the hex end or square end) will cause a reduction in the fastening torque.
3. Bolt
   • Even though the torque coefficient and the class of bolt are the same, the proper fastening torque will differ according to the diameter of the bolt.
   • Even though the diameters of bolts are the same, the proper fastening torque will differ according to the torque coefficient, the class of bolt, and the bolt length.
4. The use of the universal joint or the extension bar somewhat reduces the fastening force of the impact wrench. Compensate by fastening for a longer period of time.
5. The manner of holding the tool or the material of the driving position to be fastened will affect the torque.
6. Operating the tool at a low speed will cause a reduction in the fastening torque.

MAINTENANCE

CAUTION: Always be sure that the tool is switched off and the battery cartridge is removed before attempting to perform inspection or maintenance.
NOTICE: Never use gasoline, benzene, thinner, alcohol, or the like. Discoloration, deformation, or cracks may result.
To maintain product SAFETY and RELIABILITY, repairs, and any other maintenance or adjustment should be performed by Makita Authorized or Factory Service Centers, always using Makita replacement parts.

OPTIONAL ACCESSORIES

CAUTION: 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 with more details regarding these accessories, ask your local Makita Service Center.

• Impact socket
• Extension bar
• Universal joint
• Socket bit adapter
• Makita genuine battery and charger

NOTE: Some items in the list may be included in the tool package as standard accessories. They may differ from country to country.

Makita Europe N.V.
Jan-Baptist Vinkstraat 2,
3070 Kortenberg, Belgium
Makita Corporation
3-11-8, Sumiyoshi-cho,
Anjo, Aichi 446-8502 Japan
885531E995
20220202
www.makita.com