Overload Clutch - DeWalt D25012 Instruction Manual

NOTE: Use lower speeds for starting holes without
a centerpunch, drilling in metal, plastics or ceramics,
or driving screws. Higher speeds are better for
drilling in masonry for maximum efficiency.
VARIABLE SPEED
The variable speed trigger switch (a) permits speed
control. The farther the trigger switch is depressed,
the higher the speed of the drill.
LOCK-ON BUTTON
WARNING: Be sure to release
the locking mechanism before
disconnecting the plug from the power
supply. Failure to do so will cause the
hammerdrill to start immediately the
next time it is plugged in. Damage or
personal injury could result.
The lock-on button (i) is for use only when the rotary
hammer is stationary, mounted in a drill press stand
or for chipping applications.
Before using the tool each time, be sure that the
lock-on button release mechanism is working freely.
For continuous operation, press and hold the trigger
switch (a); press the lock-on button (i); release the
trigger switch and then release the lock-on button.
The tool will continue to run.
To stop the tool in continuous operation, quickly
press and release the trigger switch.
Proper Hand Position (fi g. 3)
WARNING: To reduce the risk of
serious personal injury, ALWAYS use
proper hand position as shown.
WARNING: To reduce the risk of
serious personal injury, ALWAYS hold
securely in anticipation of a sudden
reaction.
Proper hand position requires one hand on the side
handle (c), with the other hand on the main handle
(b).

Overload Clutch

If the drill bit becomes jammed or caught, the drive
to the drill spindle is interrupted by the overload
clutch. Because of the forces that occur as a result,
always hold the machine securely with both hands
and take a firm stance.
Drilling Tools
The machine is intended for hammerdrilling in
concrete, brick and stone. It is also suitable for
drilling without impact in wood, metal, ceramic
and plastic.
Drilling (fi g. 2)
WARNING: To reduce the risk
of serious personal injury, turn
tool off and disconnect tool from
power source before making any
adjustments or removing/installing
attachments or accessories.
WARNING: To reduce the risk of
personal injury, ALWAYS ensure
workpiece is anchored or clamped
firmly. If drilling thin material, use a wood
"back-up" block to prevent damage to
the material.
WARNING: To reduce the risk of
personal injury, ALWAYS operate
the tool with the side handle properly
installed and securely tightened. Failure
to do so may result in the side handle
slipping during tool operation and
subsequent loss of control. Hold tool
with both hands to maximize control.
Depress mode selector button (f) and turn the mode
selector (g) to the drill bit symbol for drilling, to the
hammer symbol for hammering or to the hammerdrill
symbol for hammerdrilling.
DRILLING OPERATION
1. For WOOD, use twist bits, spade bits, power
auger bits or hole saws. For METAL, use high-
speed steel twist drill bits or hole saws. Use
a cutting lubricant when drilling metals. The
exceptions are cast iron and brass which should
be drilled dry. For MASONRY, use carbide-
tipped bits or masonry bits. A smooth, even
flow of dust indicates the proper drilling rate.
2. Always apply pressure in a straight line with the
bit. Use enough pressure to keep the drill bit
biting, but do not push hard enough to stall the
motor or deflect the bit.
3. Hold tool firmly with both hands to control the
twisting action of the drill.
WARNING: Drill may stall if overloaded
causing a sudden twist. Always expect
the stall. Grip the drill firmly with both
hands to control the twisting action and
avoid injury.
4. IF DRILL STALLS, it is usually because it
is being overloaded. RELEASE TRIGGER
IMMEDIATELY, remove drill bit from work,
and determine cause of stalling. DO NOT
CLICK TRIGGER OFF AND ON IN AN
ATTEMPT TO START A STALLED DRILL –
THIS CAN DAMAGE THE DRILL.
EN GL IS H
31