Makita 6916D - User Manual

The Makita Cordless Impact Driver, model 6916D, is a powerful and versatile tool designed for various fastening applications. It is equipped with an electric brake for enhanced safety and control.

Function Description:

The impact driver is designed to fasten machine screws, standard bolts, and high tensile bolts. Its impact mechanism delivers high torque with minimal rotational force, making it efficient for driving fasteners into various materials. The electric brake ensures that the tool stops quickly after the switch trigger is released, preventing over-tightening and improving safety. The tool features a reversing switch to change the direction of rotation, allowing for both tightening and loosening of fasteners. When the reversing switch lever is in the neutral position, the switch trigger is locked, preventing accidental starting.

Important Technical Specifications:

Model: 6916D
Capacities:
- Machine screw: 4 mm - 8 mm (5/32" - 5/16")
- Standard bolt: 5 mm - 12 mm (3/16" - 1/2")
- High tensile bolt: 5 mm - 10 mm (3/16" - 3/8")
No load speed (RPM): 0 - 2,300/min.
Impacts per minute: 0 - 3,000
Overall length: 168 mm (6 - 5/8")
Net weight: 1.5 kg (3.3 lbs)
Battery Charger (Model): DC1414
Battery Charger Input: A.C. only 50 Hz - 60 Hz
Battery Charger Output: D.C. 7.2 V - 14.4 V
Battery Cartridge (Models): 1222, 1234, 1235
Battery Voltage: 12 V
Charging time:
- 1222: 45 min.
- 1234: 60 min.
- 1235: 70 min.

Usage Features:

Battery Cartridge Installation/Removal: To remove, press buttons on both sides of the cartridge and withdraw it. To insert, align the tongue with the groove in the housing and push until it clicks into place. Ensure the tool is switched off before handling the battery cartridge.
Switch Action: The tool is started by pulling the switch trigger. Speed increases with pressure on the trigger. Releasing the trigger stops the tool.
Reversing Switch Action: Depress the reversing switch lever from the 'A' side for clockwise rotation or from the 'B' side for counterclockwise rotation. The switch trigger is locked when the lever is in the neutral position. Always ensure the tool has come to a complete stop before changing the direction of rotation to prevent damage.
Driver Bit/Socket Bit Installation/Removal: Use only driver bits or socket bits of 12 mm (15/32") or 9 mm (3/8") as shown in the manual. To install, pull the sleeve in the direction of the arrow, insert the bit fully, and release the sleeve to secure it. To remove, pull the sleeve and firmly pull out the bit. If the bit is not inserted deep enough, the sleeve will not return to its original position, and the bit will not be secured.
Fastening Operation: Hold the tool firmly and apply forward pressure to the screw head to prevent slipping. The proper fastening torque depends on the screw/bolt type and size, workpiece material, and battery charge level. It is recommended to perform a test operation to determine the correct fastening time for specific screws to avoid overstressing or damaging fasteners. Continuous operation until the battery is discharged requires a 15-minute rest period before using a fresh battery. Factors affecting fastening torque include battery discharge, incorrect driver bit/socket bit size, and bolt characteristics (diameter, torque coefficient, class, and length). Holding the tool or the material of the driving position, as well as operating at low speed, can also affect torque.

Maintenance Features:

Carbon Brush Replacement: Carbon brushes should be regularly checked and replaced when they wear down to the limit mark. Keep them clean and free to slip in their holders. Both carbon brushes should be replaced simultaneously with identical carbon brushes. To replace, remove the brush holder caps with a screwdriver, take out the worn brushes, insert new ones, and secure the caps. After replacement, run the tool with no load for about 1 minute to break in the brushes. Check the tool's operation and the electric brake. If the electric brake is not functioning correctly, service is required.
General Maintenance: Always ensure the tool is switched off and the battery cartridge is removed before performing any inspection or maintenance. For product safety and reliability, repairs and other maintenance should be performed by Makita Authorized or Factory Service Centers using genuine Makita replacement parts.
Battery Charger & Cartridge Maintenance:
- Do not charge battery cartridges below 10°C (50°F) or above 40°C (104°F).
- Do not use a step-up transformer, engine generator, or DC power receptacle for charging.
- Ensure charger vents are not covered or clogged.
- Always cover battery terminals with the battery cover when not in use.
- Avoid shorting battery terminals with conductive materials or storing them with metal objects like nails or coins.
- Do not expose the battery cartridge to water or rain.
- Store the tool and battery cartridge in locations where the temperature will not exceed 50°C (122°F).
- Do not incinerate battery cartridges, even if damaged or worn out, as they can explode.
- Do not charge inside a box or container; ensure the battery is in a well-ventilated area during charging.
- If the charger or cord is damaged, replace them immediately.
- Unplug the charger from the outlet before maintenance or cleaning.
- Supervise young children to prevent them from playing with the charger.
Battery Life Tips:
- Charge the battery cartridge before it is completely discharged. Stop tool operation when power decreases.
- Avoid overcharging fully charged battery cartridges, as this shortens service life.
- Charge battery cartridges at room temperature (10°C - 40°C / 50°F - 104°F). Allow hot cartridges to cool before charging.
- Charge Nickel Metal Hydride battery cartridges if not used for more than six months.
Recycling the Battery: Makita batteries must be recycled. Remove the battery from the tool and take it to a Makita Factory Service Center or an Authorized Service Center/Distributor designated as a Makita battery recycling location. Refer to local Yellow Pages under "Tools-Electric" for recycling locations.

Safety Precautions:

Always read and understand all instructions before using the tool to prevent electric shock, fire, and serious personal injury.
Keep the work area clean and well lit.
Do not operate in explosive atmospheres (flammable liquids, gases, dust).
Keep bystanders, children, and visitors away.
Use the specified charger for battery-operated tools.
Use only specifically designated battery packs.
Stay alert, watch what you are doing, and use common sense. Do not operate while tired or under the influence of drugs, alcohol, or medication.
Dress properly: avoid loose clothing, jewelry, and long hair near moving parts.
Avoid accidental starting: ensure the switch is in the locked or off position before inserting the battery pack.
Remove adjusting keys or wrenches before turning the tool on.
Do not overreach; maintain proper footing and balance.
Use safety equipment: wear eye protection, dust mask, non-skid safety shoes, hard hat, or hearing protection as appropriate.
Secure workpieces with clamps or other practical means.
Do not force the tool; use the correct tool for the application.
Do not use the tool if the switch does not turn it on or off.
Disconnect the battery pack or place the switch in the locked/off position before making adjustments, changing accessories, or storing the tool.
Store idle tools out of reach of children and untrained persons.
Keep battery packs away from other metal objects to prevent shorting, which can cause sparks, burns, or fire.
Maintain tools with care; keep cutting tools sharp and clean.
Check for misalignment, binding, or breakage of parts. Have damaged tools serviced.
Use only accessories recommended by the manufacturer.
Tool service must be performed by qualified repair personnel using identical replacement parts.
Hold the tool by insulated gripping surfaces when the cutting tool may contact hidden wiring to prevent electric shock.
Be aware that the tool is always in an operating condition as it does not need to be plugged into an outlet.
Always ensure firm footing, especially when working in high locations.
Hold the tool firmly.
Wear ear protectors.
Do not let comfort or familiarity with the product replace strict adherence to safety rules. Misuse can cause serious personal injury.
Dust created by power sanding, sawing, grinding, drilling, and other construction activities may contain chemicals known to cause cancer, birth defects, or other reproductive harm (e.g., lead, crystalline silica, arsenic, chromium). Work in well-ventilated areas and use approved safety equipment like dust masks to reduce exposure.