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The Makita Cordless Impact Wrench, models DTW284 and DTW285, is a robust power tool designed for efficiently fastening bolts and nuts. This instruction manual provides comprehensive guidance on its operation, safety, and maintenance, ensuring users can maximize its performance and longevity.
The impact wrench is powered by a lithium-ion battery, offering cordless convenience and portability. It features a square drive for attaching impact sockets, which are essential for its primary function of tightening and loosening fasteners. The tool incorporates a reversing switch, allowing users to change the direction of rotation between clockwise and counterclockwise, crucial for both fastening and unfastening tasks. A key feature is the ability to adjust the impact force and mode, providing versatility for various applications. Users can select from Hard, Medium, Soft impact modes, and a unique Reverse Rotation Auto Stop mode, which automatically stops the tool's impact and rotation once a bolt or nut is sufficiently loosened in counterclockwise rotation. This intelligent feature helps prevent over-loosening and potential damage to fasteners.
The tool also includes a front lamp to illuminate the work area, enhancing visibility in dimly lit conditions. The lamp status can be toggled on or off, and it automatically turns off after a period of inactivity to conserve battery power. A battery protection system is integrated to extend battery life by automatically cutting off power under conditions such as overload or low battery voltage. For battery cartridges equipped with an indicator, users can check the remaining battery capacity by pressing a dedicated check button, with indicator lamps displaying the current charge level.
Before operating the impact wrench, it is crucial to ensure the battery cartridge is properly installed and the switch trigger actuates correctly. The battery cartridge should be inserted fully until the red indicator is no longer visible, signifying a secure connection. The tool's speed is controlled by the pressure applied to the switch trigger, allowing for variable speed operation. For optimal performance and safety, users are advised to always check the direction of rotation before starting any operation and to only change the direction of rotation when the tool has come to a complete stop. When not in use, setting the reversing switch lever to the neutral position prevents unintentional starting.
Selecting the correct impact socket size is paramount for accurate and consistent fastening torque and to prevent damage to the bolt, nut, or socket. The manual details two methods for installing impact sockets: one for tools with a ring spring (for sockets without an O-ring and pin) and another for tools with a detent pin (for sockets with an O-ring and pin). Users are cautioned to ensure the impact socket is firmly secured before use.
The impact wrench is designed for a variety of tasks, from assembling steel frames (Hard impact mode) to fine adjustments with small diameter bolts (Soft impact mode) and disassembling bolts/nuts (Reverse Rotation Auto Stop mode). The manual provides graphs illustrating the relationship between fastening time and torque for both standard and high tensile bolts, emphasizing the importance of holding the tool straight at the fastener and performing test operations to determine the proper fastening time for specific applications. Factors such as battery charge level, impact socket condition, and the use of universal joints or extension bars can influence fastening torque, and users are advised to compensate accordingly and always verify the final torque with a torque wrench.
Proper maintenance is essential for ensuring the safety, reliability, and longevity of the Makita Cordless Impact Wrench. Before performing any inspection or maintenance, the tool must be switched off, and the battery cartridge removed. Users are strictly warned against using gasoline, benzine, thinner, alcohol, or similar substances for cleaning, as these can cause discoloration, deformation, or cracks.
The manual emphasizes the importance of using genuine Makita replacement parts for all repairs and adjustments, which should be performed by Makita Authorized or Factory Service Centers. This ensures that the tool's safety and performance standards are maintained.
For battery cartridges, specific care instructions are provided to maximize battery life. This includes charging the battery cartridge before it is completely discharged and stopping operation when tool power noticeably decreases. Overcharging a fully charged battery cartridge is discouraged as it shortens service life. Batteries should be charged at room temperature (10 °C - 40 °C / 50 °F - 104 °F), and hot battery cartridges should be allowed to cool down before charging. If the tool is not used for an extended period (more than six months), the battery cartridge should still be charged.
Additionally, users are reminded not to short-circuit the battery cartridge by touching terminals with conductive materials or storing it with other metal objects. Exposure to water or rain should also be avoided. In case of electrolyte contact with eyes, immediate rinsing with clear water and medical attention are required. The manual also provides guidelines for the safe disposal of battery cartridges, advising removal from the tool and adherence to local regulations.
General| Type | Cordless Impact Wrench |
|---|---|
| Voltage | 18V |
| Max Torque | 280 Nm |
| Weight | 1.7 kg |
| Battery Type | Lithium-Ion |
| Drive Shank | 1/2 inch |
| Length | 147 mm |
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