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Makita DHR281 Manual

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15 ENGLISH
Changing the quick change chuck
for SDS-plus
For DHR281/DHR283
The quick change chuck for SDS-plus can be easily
exchanged for the quick change drill chuck.
Removing the quick change chuck
for SDS-plus
CAUTION: Before removing the quick change
chuck for SDS-plus, be sure to remove the bit.
Grasp the change cover of the quick change chuck for
SDS-plus and turn in the direction of the arrow until
the change cover line moves from the symbol to
the symbol. Pull forcefully in the direction of the arrow.
► Fig.7: 1. Quick change chuck for SDS-plus
2. Change cover 3. Change cover line
Installing the quick change drill chuck
Check the line of the quick change drill chuck shows
the symbol. Grasp the change cover of the quick
change drill chuck and set the line to the
symbol.
Place the quick change drill chuck on the spindle of the
tool. Grasp the change cover of the quick change drill
chuck and turn the change cover line to the symbol
until a click can clearly be heard.
► Fig.8: 1. Quick change drill chuck 2. Spindle
3. Change cover line 4. Change cover
Selecting the action mode
NOTICE:
Do not rotate the action mode changing
knob when the tool is running. The tool will be damaged.
NOTICE: To avoid rapid wear on the mode
change mechanism, be sure that the action mode
changing knob is always positively located in one
of the three action mode positions.
Rotation with hammering
For drilling in concrete, masonry, etc., rotate the action
mode changing knob to the symbol. Use a tungsten-
carbide tipped bit (optional accessory).
► Fig.9: 1. Rotation with hammering 2. Action mode
changing knob
Rotation only
For drilling in wood, metal or plastic materials, rotate
the action mode changing knob to the
symbol. Use a
twist drill bit or wood drill bit.
► Fig.10: 1. Rotation only
Hammering only
For chipping, scaling or demolition operations, rotate
the action mode changing knob to the symbol. Use a
bull point, cold chisel, scaling chisel, etc.
► Fig.11: 1. Hammering only
Hook
CAUTION: Never hook the tool at high loca-
tion or on potentially unstable surface.
► Fig.12: 1. Hook
The hook is convenient for temporarily hanging the tool.
To use the hook, simply lift up hook until it snaps into
the open position. When not in use, always lower hook
until it snaps into the closed position.
Adjusting the nozzle position of the
dust collection system
Optional accessory
Push in the guide while pushing up the guide adjust-
ment button, and then release the button at the desired
position.
► Fig.13: 1. Guide 2. Guide adjustment button
NOTE: Before adjusting the nozzle position, release
the nozzle forward completely by pushing up the
guide adjustment button.
If a long drill bit is installed, extend the guide by pushing
up the extension button.
► Fig.14: 1. Extension button
Adjusting the drilling depth of the
dust collection system
Optional accessory
Slide the depth adjustment button to the desired posi-
tion while pushing it up. The distance (A) is the drilling
depth.
► Fig.15: 1. Depth adjustment button
Torque limiter
NOTICE: As soon as the torque limiter actuates,
switch off the tool immediately. This will help pre-
vent premature wear of the tool.
NOTICE: Drill bits such as hole saw, which tend
to pinch or catch easily in the hole, are not appro-
priate for this tool. This is because they will cause
the torque limiter to actuate too frequently.
The torque limiter will actuate when a certain torque
level is reached. The motor will disengage from the
output shaft. When this happens, the drill bit will stop
turning.
Electronic function
The tool is equipped with the electronic functions for
easy operation.
• Constant speed control
The speed control function provides the constant
rotation speed regardless of load conditions.
• Active Feedback sensing Technology (For
DHR282/DHR283)
If the tool is swung at the predetermined accelera-
tion during operation, the motor is forcibly stopped
to reduce the burden on the wrist.
… 15 …


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