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12. Do not point the tool at any one in the area when
operating. The bit could fly out and injure
someone seriously.
13. Do not touch the bit or parts close to the bit
immediately after operation; they may be
extremely hot and could burn your skin.
14. Some material contains chemicals which may be
toxic. Take caution to prevent dust inhalation and
skin contact. Follow material supplier safety data.
SAVE THESE INSTRUCTIONS.
WARNING:
MISUSE or failure to follow the safety rules stated in
this instruction manual may cause serious personal
injury.
FUNCTIONAL DESCRIPTION
CAUTION:
• Always be sure that the tool is switched off and
unplugged before adjusting or checking function on the
tool.
Switch action (Fig. 1)
CAUTION:
• Before plugging in the tool, always check to see that
the switch trigger actuates properly and returns to the
"OFF" position when released.
• Do not tape, tie or otherwise secure the trigger in the
"ON" position.
To start the tool, simply pull the switch trigger. Release
the switch trigger to stop.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Side grip (auxiliary handle) (Fig. 2)
For maximum control and safer operation, always use the
side grip with this tool. The side grip can be locked at four
positions, horizontally and perpendicularly when the
protrusion on the side grip base fits in the notch in the
barrel (tool). Loosen the side grip by turning it
counterclockwise, swing it to the desired position and then
tighten it by turning clockwise.
Bit grease (optional accessory)
Coat the bit shank head beforehand with a small amount
of bit grease (about 0.5 -1 g; 0.02 - 0.04 oz.). This chuck
lubrication assures smooth action and longer service life.
Installing or removing the bit (Fig. 3)
Pivot the tool retainer to the side. (If it is difficult to move
the tool retainer with your thumbs, tap it with a hammer.)
Insert the bit into the tool barrel as far as it will go.
Return the tool retainer to its original position to secure
the bit.
To remove the bit, follow the installation procedure in
reverse.
Depth gauge (Fig. 4)
The depth gauge is convenient for drilling holes of uniform
depth. Loosen the clamp screw and adjust the depth
gauge to the desired depth. After adjusting, tighten the
clamp screw.
NOTE:
• The depth gauge cannot be used at the position where
the depth gauge strikes against the gear housing.
OPERATION
CAUTION:
Always use the side grip (auxiliary handle) and firmly hold
the tool by both side grip and switch handle during
operations.
Hammer drilling operation (Fig. 5)
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:
• When the bit begins to break through concrete or if the
bit strikes reinforcing rods embedded in concrete, the
tool may react dangerously. Maintain good balance
and safe footing while holding the tool firmly with both
hands to prevent dangerous reaction.
Blow-out bulb (optional accessory)
(Fig. 6)
After drilling the hole, use the blow-out bulb to clean the
dust out of the hole.
Chipping/Scaling/Demolition (Fig. 7)
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.
Core bit (optional accessory)
Screw the core bit on the adapter. Install the adapter with
the core bit in the tool in the same manner as a drill bit.
(Fig. 8)
Install the center bit. (Fig. 9)
Rest the core bit on the concrete and turn the tool on.
Once the core bit has cut a shallow groove into the
concrete, remove the center bit. Then resume drilling.
(Fig. 10)
To remove the core bit, hold the adapter with the wrench,
insert the rod (optional accessory) into the hole in the core
bit and tap with a hammer to unscrew. (Fig. 11)
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.
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