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Reversing switch action (Fig. 4)
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 counter-
clockwise rotation.
When the reversing switch lever is in the neutral position,
the switch trigger cannot be pulled.
CAUTION:
• 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.
• When not operating the tool, always set the reversing
switch lever to the neutral position.
Changing the quick change chuck for SDS-plus
For Model DHR243
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
(Fig. 5)
CAUTION:
• Before removing the quick change chuck for SDS-plus,
always 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. Pull forcefully in the direction of the arrow.
Attaching the quick change drill chuck (Fig. 6)
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
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
click can clearly be heard.
Selecting the action mode
Rotation with hammering (Fig. 7)
For drilling in concrete, masonry, etc., depress the lock
button and rotate the action mode changing knob to the
symbol. Use a tungsten-carbide tipped bit.
Rotation only (Fig. 8)
For drilling in wood, metal or plastic materials, depress
the lock button and rotate the action mode changing
knob to the m symbol. Use a twist drill bit or wood bit.
Hammering only (Fig. 9)
For chipping, scaling or demolition operations, depress
the lock button and rotate the action mode changing
knob to the
symbol. Use a bull point, cold chisel, scal-
ing chisel, etc.
Notice on the action mode changing knob operation
To avoid the damage to the mechanism of the action
mode changing knob, follow the procedures below:
• Do not rotate the action mode changing knob when the
tool is running.
• Make sure that the action mode changing knob is
always positively located in one of the three action
mode positions (m,
8
symbol to the
symbol.
symbol until a
, or
). (Fig. 10)
• Do not turn the knob forcibly. Forcing the knob may
cause tool damage.
When turning the action mode changing knob from the
symbol to the m symbol or vise versa, the knob may
no longer move in the
move the knob to the
tool few seconds. After that, move the knob to the
desired position. (Fig. 11)
Torque limiter
The torque limiter will actuate when a certain torque level
is reached. The motor will disengage from the output
shaft. When this happens, the bit will stop turning.
CAUTION:
• As soon as the torque limiter actuates, switch off the
tool immediately. This will help prevent premature wear
of the tool.
• Hole saws cannot be used with this tool. They tend to
pinch or catch easily in the hole. This will cause the
torque limiter to actuate too frequently.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and the bat-
tery cartridge is removed before carrying out any work
on the tool.
Side grip (auxiliary handle) (Fig. 12)
CAUTION:
• Always use the side grip to ensure operating safety.
Install the side grip so that the protrusion on the grip fit in
between the grooves in the tool barrel. Then tighten the
grip by turning clockwise at the desired position. It may
be swung 360° so as to be secured at any position.
Bit grease
Coat the bit shank head beforehand with a small amount
of bit grease (about 0.5 – 1 g). This chuck lubrication
assures smooth action and longer service life.
Installing or removing the bit
Clean the bit shank and apply bit grease before installing
the bit. (Fig. 13)
Insert the bit into the tool. Turn the bit and push it in until
it engages.
If the bit cannot be pushed in, remove the bit. Pull the
chuck cover down a couple of times. Then insert the bit
again. Turn the bit and push it in until it engages.
(Fig. 14)
After installing, always make sure that the bit is securely
held in place by trying to pull it out.
To remove the bit, pull the chuck cover down all the way
and pull the bit out. (Fig. 15)
Bit angle (when chipping, scaling or demolishing)
(Fig. 16 & 17)
The bit can be secured at the desired angle. To change
the bit angle, depress the lock button and rotate the
action mode changing knob to the
bit to the desired angle.
Depress the lock button and rotate the action mode
changing knob to the
the bit is securely held in place by turning it slightly.
symbol position. In this case,
symbol position and run the
symbol. Turn the
O
symbol. Then make sure that
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