Makita 6842, 6843, 6844, 6846 - Auto Feed Screwdriver Manual

SPECIFICATIONS

Model	6842	6843	6846	6844
Screw strip	4 mm x 25 mm - 55 mm			4 mm x 45 mm - 75 mm
No load speed (min -1 )	4,700	6,000	3,000
Overall length	400 mm			440 mm
Net weight	2.0 kg			2.1 kg
Safety class	/II

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

Intended use
The tool is intended for screw driving in wood, metal and plastic.

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 in accordance with European Standard and can, therefore, also be used from sockets without earth wire.

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

Model 6842, 6843
Sound pressure level (L_pA): 84 dB(A)
Sound power level (L_WA): 95 dB(A)
Uncertainty (K): 3 dB(A)

Model 6844
Sound pressure level (L_pA): 85 dB(A)
Sound power level (L_WA): 96 dB(A)
Uncertainty (K): 3 dB(A)

Wear ear protection

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

Work mode: screwdriving without impact
Vibration emission (a_h): 2.5 m/s² or less
Uncertainty (K): 1.5 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.

SCREWDRIVER 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. Always be sure you have a firm footing. Be sure no one is below when using the tool in high locations.
3. Hold the tool firmly.
4. Keep hands away from rotating parts.
5. Do not touch the bit or the workpiece immediately after operation; they may be extremely hot and could burn your skin.

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. Lock button
2. 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. To start the tool, simply pull the switch trigger. Release the switch trigger to stop.

For continuous operation, pull the switch trigger and then push in the lock button.

To stop the tool from the locked position, pull the switch trigger fully, then release it.

Reversing switch action

Fig.2

1. Reversing switch lever

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.

• Always check the direction of rotation before operation.
• 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.

Hook

The hook is convenient for hooking the tool to your belt. It can be installed on either side of the tool.

Changing the installation position of hook allows two-way setting of 10 mm and 20 mm distance from the tool itself. The tool with hook can be hung on the waist belt, a maximum diameter 20 mm pipe etc. To remove the hook, just remove the clamping screw. Place it on the tool and secure it with the clamping screw to install.

Fig.3

1. Hook
2. Clamping screw

ASSEMBLY

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

Installing or removing the bit

Loosen the thumb screws which secure the casing. Pull out the casing in the direction of the arrow.

Fig.4

1. Casing
2. Thumb screw

Press the dust cover toward the plain bearing and pull out the bit. If the dust cover cannot be moved as far as the plain bearing, try it again after turning the bit slightly. To install the bit, insert it into the socket while turning it slightly. After installing, always make sure that the bit is securely held in place by trying to pull it out.

Fig.5

1. Plane bearing
2. Dust cover

Setting for desired screw length

Fig.6

1. Lever
2. Stopper base
3. Label on feeder box
4. Fenestella

There are 7 positive-lock screw length settings. To obtain the desired setting, pull out the stopper base while depressing the lever until you see the number of the desired screw length (indicated on the label on feeder box) appear to rest in the fenestella of stopper base. See the table below for the relation between the number indicated on the label on feeder box and the respective screw length.

For Models 6842, 6843,6846

For Model 6844

Adjusting the driving depth

Fig.7

1. Stopper base
2. Casing
3. Adjusting knob

Depress the stopper base as far as it will go. While keeping it in this position, turn the adjusting knob until the bit tip projects approx. 5 mm from the stopper base. Drive a trial screw. If the screw head projects above the surface of the workpiece, turn the adjusting knob in the "A" direction; if the screw head is counter-sunk, turn the adjusting knob in the "B" direction.

Installing screw strip

Insert the screw strip through the screw guide. Then insert it through the feeder box until the first screw reaches the position next to the driving position.

Fig.8

1. Feeder box
2. Screw strip
3. Screw guide

Fig.9

1. Driving position

Removing screw strip

To remove the screw strip, just pull it out in the direction of the arrow. If you depress the reverse button, you can pull out the screw strip in the reverse direction of the arrow.

Fig.10

Fig.11

1. Reverse button

Folding screw guide

Fig.12

Screw guide is foldable. Folding the screw guide allows space used for storage to be minimal.

Extension handle (optional accessory)

Fig.13

1. Extension handle

Use of extension handle allows you to drive screws into floors while standing.

OPERATION

Driving operation

Fig.14

Switch on the tool by pressing the switch trigger and at the same time pushing the lock button. Hold the tool squarely against the workpiece and apply forward pressure to the tool. The screw will be automatically carried to the driving position and driven into the workpiece.

• Always hold the tool squarely against the driving surface. Holding it at an angle may damage the screw heads and cause wear on the bit. This may also lead to poor fastening.
• Always keep the tool firmly against the driving surface until the driving is over. Failure to do so may cause insufficient fastening of screws.
• Be careful not to drive a screw onto another screw already fastened.
• Do not operate the tool without screws. It will damage the driving surface.

Driving in corner

Fig.15

1. Wall
2. Stopper base

This tool can be used to drive at a position 15 mm away from the wall as shown in the figure.

• Driving at a position closer than 15 mm to the wall or driving with the stopper base in contact with the wall may damage the screw heads and cause wear on the bit. This may also lead to poor fastening of screws and malfunction of the tool.

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.16

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.17

1. Brush holder cap
2. Screwdriver

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.
• Phillips bit
• Drywall screw strips
• Extension handle
• Plastic carrying case