Makita 6905B; 6906 - Impact Wrench Manual

SPECIFICATIONS

Model		6905B	6906
Capacities	Standard bolt	M12 - M20	M16 - M22
	High tensile bolt	M12 - M16	M16 - M20
Square drive		12.7 mm	19 mm
No load speed (min-1)		1,700	1,700
Impacts per minute		2,000	1,600
Max. fastening torque		294 N.m	588 N.m
Overall length		270 mm	327 mm
Net weight		2.8 kg	5.6 kg
Safety class		/II	/II

• Due to our continuing programme of research and development, the specifications herein are subject to change without notice.
• Note: Specifications may differ from country to country.
• Weight according to EPTA-Procedure 01/2003

Intended use
The tool is intended for fastening bolts and nuts.

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.

Noise
The typical A-weighted noise level determined according to EN60745:

Model 6905B
Sound pressure level (L_pA): 93 dB(A)
Sound power level (L_WA): 104 dB(A)
Uncertainty (K): 3 dB(A)

Model 6906
Sound pressure level (L_pA): 98 dB(A)
Sound power level (L_WA): 109 dB(A)
Uncertainty (K): 3 dB(A)

Wear ear protection

Vibration
The vibration total value (tri-axial vector sum) determined according to EN60745:

Model 6905B
Work mode: impact tightening of fasteners of the maximum capacity of the tool
Vibration emission (a_h): 16.5 m/s²
Uncertainty (K): 1.5 m/s²

Model 6906
Work mode: impact tightening of fasteners of the maximum capacity of the tool
Vibration emission (a_h): 16.5 m/s²
Uncertainty (K): 2.0 m/s²

• The declared vibration emission value has been measured in accordance with the standard test method and may be used for comparing one tool with another.
• The declared vibration emission value may also be used in a preliminary assessment of exposure.

• The vibration emission during actual use of the power tool can differ from the declared emission value depending on the ways in which the tool is used.
• Be sure to identify safety measures to protect the operator that are 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).

General Power Tool Safety Warnings

Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

IMPACT WRENCH SAFETY WARNINGS

1. Hold power tool by insulated gripping surfaces, when performing an operation where the fastener may contact hidden wiring or its own cord. 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 socket carefully for wear, cracks or damage before installation.
4. Hold the tool firmly.
5. Always be sure you have a firm footing. Be sure no one is below when using the tool in high locations.
6. The proper fastening torque may differ depending upon the kind or size of the bolt. Check the torque with a torque wrench.

SAVE THESE INSTRUCTIONS.

FUNCTIONAL DESCRIPTION

• Always be sure that the tool is switched off and unplugged before adjusting or checking function on the tool.

Switch action

Fig.1

1. Switch trigger

• Before plugging in the tool, always check to see that the switch trigger actuates properly and returns to the "OFF" position when released.
• Change the direction of rotation only when the tool comes to a complete stop. Changing it before the tool stops may damage the tool.

The switch is reversible, providing either clockwise or counterclockwise rotation. To start the tool, simply pull the lower part of the switch trigger for clockwise or the upper part for counterclockwise. Release the switch trigger to stop.

ASSEMBLY

• Always be sure that the tool is switched off and unplugged before carrying out any work on the tool.

Installing side grip

Fig.2 For 6906 only

1. Side grip

Fit the side grip into the groove on the middle of the hammer case and fasten securely.

Selecting correct socket

Always use the correct size socket for bolts and nuts. An incorrect size socket will result in inaccurate and inconsistent fastening torque and/or damage to the bolt or nut.

Installing or removing socket

Fig.3

1. Socket
2. Anvil

1. For socket without O-ring and pin To install the socket, push it onto the anvil of the tool until it locks into place. To remove the socket, simply pull it off.
2. For socket with O-ring and pin

Fig.4

1. Socket
2. O-ring
3. Pin

Move the O-ring out of the groove in the socket and remove the pin from the socket. Fit the socket onto the anvil of the tool so that the hole in the socket is aligned with the hole in the anvil. Insert the pin through the hole in the socket and anvil. Then return the O-ring to the original position in the socket groove to retain the pin. To remove the socket, follow the installation procedures in reverse.

OPERATION

For 6906 only

Always use the side grip (auxiliary handle) and firmly hold the tool by side grip and switch handle during operations.

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.

Hold the tool firmly and place the socket over the bolt or nut. Turn the tool on and fasten for the proper fastening time.

NOTE:

• Hold the tool pointed straight at the bolt or nut.
• Excessive fastening torque may damage the bolt/nut or socket. Before starting your job, always perform a test operation to determine the proper fastening time for your bolt or nut.

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. Voltage
   Voltage drop will cause a reduction in the fastening torque.
2. Socket

• Failure to use the correct size socket will cause a reduction in the fastening torque.
• A worn 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 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 driving position to be fastened will affect the torque.

MAINTENANCE

• Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance.
• Never use gasoline, benzine, thinner, alcohol or the like. Discoloration, deformation or cracks may result.

Replacing carbon brushes

Fig.5

1. Limit mark

Remove and check the carbon brushes regularly. Replace when they wear down to the limit mark. Keep the carbon brushes clean and free to slip in the holders. Both carbon brushes should be replaced at the same time. Use only identical carbon brushes.

Use a screwdriver to remove the brush holder caps. Take out the worn carbon brushes, insert the new ones and secure the brush holder caps.

Fig.6

1. Screwdriver
2. Brush holder cap

To maintain product SAFETY and RELIABILITY, repairs, any other maintenance or adjustment should be performed by Makita Authorized Service Centers, always using Makita replacement parts.

ACCESSORIES

• 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.
• Sockets
• Extension bar
• Universal joint