DeWalt DWC709 Instruction Manual page 40

WARNING: Do not attempt to tighten drill bits (or any other
accessory) by gripping the front part of the chuck and turning the tool
on. Damage to the chuck and personal injury may result. Always lock
off trigger switch when changing acces sories.
Be sure to tighten chuck with one hand on the chuck sleeve and one
hand holding the tool for maximum tightness.
Chuck Removal (Fig. 7)
WARNING: Always wear ANSI Z87.1 eye protection (CAN/CSA
Z94.3) eye protection.
Turn the adjustment collar to the "drill" position and low speed gear
shifter to position 1. Tighten the chuck around the shorter end of a
hex key (not supplied) of 1/4" or greater size. Using a wooden mallet
or similar object, strike the longer end in the clockwise direction, as
shown. This will loosen the screw inside the chuck.
Open chuck jaws fully, insert screwdriver (or Torx tool if required) into
front of chuck between jaws to engage screw head. Remove screw
by turning clockwise (left-hand-thread). Place hex key in chuck and
tighten, as shown in Figure 8. Using a wooden mallet or similar object,
strike key sharply in the counterclockwise direction. This will loosen
the chuck so that it can be unscrewed by hand.
FIG. 7
Chuck Installation (Fig. 8)
Screw the chuck on by hand as far as it will go and insert screw (LH
thread). Tighten screw securely. Tighten the chuck around the shorter
end of a 1/4" or larger hex key (not supplied) strike the longer end in
the clockwise direction with a wooden mallet, as shown. Tighten the
screw once again by turning in a counterclockwise direction.
Operation as a Drill
Turn the collar to the drill bit symbol. Install and tighten the desired
drill bit in the chuck. Select the desired speed/torque range using the
dual range gear shifter to match the speed and torque to the planned
operation. Follow these instructions for best results when drilling.
DRILLING
1. 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.
2. Be sure the material to be drilled is anchored or clamped firmly.
If drilling thin material, use a "back-up" block to prevent damage
to the material.
3. 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.
4. Hold tool firmly to control the twisting action of the drill.
5. 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.
6. To minimize stalling or breaking through the material, reduce
pressure on drill and ease the bit through the last fractional part of
FIG. 8
the hole.
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