Makita DHR242ZJW Instruction Manual page 10

NOTE:
• The depth gauge cannot be used at the position where
the depth gauge strikes against the gear housing.
Dust cup
► Fig.19: 1. Dust cup
Use the dust cup to prevent dust from falling over the
tool and on yourself when performing overhead drilling
operations. Attach the dust cup to the bit as shown in
the figure. The size of bits which the dust cup can be
attached to is as follows.
Dust cup 5
Dust cup 9
OPERATION
Hammer drilling operation
► Fig.21
Set the action mode changing knob to the
Position the bit at the desired location for the hole, then
pull the switch trigger.
Do not force the tool. Light pressure gives best results.
Keep the tool in position and prevent it from slipping
away from the hole.
Do not apply more pressure when the hole becomes
clogged with chips or particles. Instead, run the tool at
an idle, then remove the bit partially from the hole. By
repeating this several times, the hole will be cleaned out
and normal drilling may be resumed.
CAUTION:
• There is a tremendous and sudden twisting force
exerted on the tool/bit at the time of hole break-
through, when the hole becomes clogged with
chips and particles, or when striking reinforcing
rods embedded in the concrete. Always use the
side grip (auxiliary handle) and firmly hold the
tool by both side grip and switch handle during
operations. Failure to do so may result in the loss
of control of the tool and potentially severe injury.
NOTE: Eccentricity in the bit rotation may occur while oper-
ating the tool with no load. The tool automatically centers itself
during operation. This does not affect the drilling precision.
Blow-out bulb (optional accessory)
► Fig.22: 1. Blow-out bulb
After drilling the hole, use the blow-out bulb to clean the
dust out of the hole.
Chipping/Scaling/Demolition
► Fig.23
Set the action mode changing knob to the
Hold the tool firmly with both hands. Turn the tool on
and apply slight pressure on the tool so that the tool will
not bounce around, uncontrolled. Pressing very hard on
the tool will not increase the efficiency.
Bit diameter
6 mm - 14.5 mm
12 mm - 16 mm
symbol.
symbol.
10 ENGLISH
Drilling in wood or metal
► Fig.24: 1. Chuck adapter 2. Keyless drill chuck
► Fig.25: 1. Sleeve 2. Ring
Use the optional drill chuck assembly. When installing it,
refer to "Installing or removing the bit" described on the
previous page.
Set the action mode changing knob so that the pointer
points to the symbol.
For model DHR243
CAUTION:
• Never use "rotation with hammering" when the
drill chuck assembly is installed on the tool. The
drill chuck assembly may be damaged. Also, the
drill chuck will come off when reversing the tool.
► Fig.26: 1. Quick change chuck for SDS-plus
2. Change cover line 3. Change cover
► Fig.27: 1. Spindle 2. Quick change drill chuck
3. Change cover 4. Change cover line
Use the quick change drill chuck as standard equip-
ment. When installing it, refer to "changing the quick
change chuck for SDS-plus " described on the previous
page.
► Fig.28: 1. Quick change drill chuck 2. Sleeve
3. Ring
Hold the ring and turn the sleeve counterclockwise to
open the chuck jaws. Place the bit in the chuck as far as
it will go. Hold the ring firmly and turn the sleeve clock-
wise to tighten the chuck. To remove the bit, hold the
ring and turn the sleeve counterclockwise.
Set the action mode changing knob to the
You can drill up to 13 mm diameter in metal and up to
32 mm diameter in wood.
CAUTION:
• Never use "rotation with hammering" when the
quick change drill chuck is installed on the tool.
The quick change drill chuck may be damaged.
Also, the drill chuck will come off when reversing
the tool.
• Pressing excessively on the tool will not speed
up the drilling. In fact, this excessive pressure
will only serve to damage the tip of your bit,
decrease the tool performance and shorten the
service life of the tool.
• There is a tremendous twisting force exerted
on the tool/bit at the time of hole breakthrough.
Hold the tool firmly and exert care when the bit
begins to break through the workpiece.
• A stuck bit can be removed simply by setting
the reversing switch to reverse rotation in order
to back out. However, the tool may back out
abruptly if you do not hold it firmly.
• Always secure small workpieces in a vise or
similar hold-down device.
symbol.