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1. HAMMER DRILL AND DRILL SWITCH
2. TRIGGER SWITCH.
3. LOCK-ON BUTTON.
4. FORWARD/REVERSE SWITCH.
5. ADDITIONAL HANDLE.
OPERATION INSTRUCTIONS
INSTALLING AND REMOVING DRILL BITS
To install:
1. To open the chuck jaws, place the chuck key
in one of the three holes located on the chuck.
Turn the key counter-clockwise.
2. Insert the bit into the chuck jaws. Center the
bit in the chuck jaws, and tighten the bit by
hand to align the chuck jaws.
3. To close the chuck jaws, place the chuck key
in one of the three holes in the chuck. Turn the
chuck key clockwise until the chuck is tight-
ened securely.
To remove:
1. Insert the chuck key into one of the holes in
the chuck.
2. Turn the chuck key counter-clockwise to
loosen the chuck.
3. Remove the bit.
WARNING: Do not attempt to tighten the
chuck by gripping the front part and turning
the drill on. Damage to the tool and personal
injury may result. Be sure to tighten the chuck
with the chuck key.
• Installing the auxiliary handle
Loosen the auxiliary handle by turning it coun-
ter-clockwise. Rotate the handle to any posi-
tion, and then tighten the handle.
• Installing the depth gauge
Loosen the knob, adjust the depth gauge to
the desired position, and then tighten the
knob.
• Hammer drill and drill operation switch
Set
, to drill holes in wood or metal.
Set
, to drill holes in concrete.
• Forward/reverse switch
The forward/reverse switch determines the
running direction of the tool.
1. To select “forward” motion, release the
trigger switch, and push the forward/reverse
switch to the right side of the tool.
2. To select “reverse” motion, release the
trigger switch, and push the forward/reverse
switch to the left side of the tool.
NOTE: When you operate the tool in counter-
clockwise rotation, the switch trigger is pulled
only halfway and the tool runs at half speed.
For counterclockwise rotation, you cannot
push in the lock button.
• On/off switch and lock-on button
1. To turn the tool “ON”, depress the trigger
switch. Increased pressure increases the speed.
2. To turn the tool “OFF”, release the trigger
switch.
CAUTION: Allow the motor to come to a
complete stop before setting the drill down.
LOCK-ON FOR CONTINUOUS OPERATION:
The trigger switch is equipped with a lock-on
button.
1. To activate the lock-on feature, squeeze the
trigger switch to turn the tool “ON”, and then
depress the lock-on button. The trigger switch
now is locked “ON”.
2. To disable the lock-on button and turn the
tool OFF, squeeze the trigger switch again.
The lock-on button will disengage. Release the
trigger switch to turn the tool “OFF”.
OPERATION
DRILLING OPERATION
Hold the drill comfortably, with your finger on
the trigger switch.
NOTE: Use sharp drill bits only.
• For wood, use twist-drill bits, spade bits,
power-auger bits, or hole saws.
• For metal, use high-speed, steel-twist drill
bits or hole saws.
• For masonry (brick, cement, cinder block,
etc.), use carbide-tipped drill bits.
• Be sure that the material to be drilled is an-
chored or clamped firmly.
• If drilling thin material, use a “back-up” block
in order to prevent damage to the material.
TO BEGIN DRILLING
1. When starting a hole, make a mark on the
surface of the workpiece, and then drill a small
hole.
2. Hold the drill firmly with both hands.
3. Depress the trigger switch to start the drill,
gradually increasing speed. For continuous or
extended operation, hold the lock-on button
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RM312B-RM338 manual.indd 10
01/12/16 17:09
