DeWalt DCD791D2 Original Instructions Manual page 16

english
Drill Operation (Fig. 1, 4)
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.
1. Turn the collar (Fig. 4, C) to the drill symbol.
2. Select the desired speed/torque range using
the gear shifter (Fig. 1, D) to match the speed
and torque to the planned operation.
3. 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.
4. Always apply pressure in a straight line with the
bit. Use enough pressure to keep drill biting,
but do not push hard enough to stall the motor
or deflect the bit.
5. Hold tool firmly with both hands to control
the twisting action of the drill. If model is not
equipped with side handle, grip drill with one
hand on the handle and one hand on the
battery pack.
CAUTION: Drill may stall if overloaded
causing a sudden twist. Always expect
the stall. Grip the drill firmly to control the
twisting action and avoid injury.
6. IF DRILL STALLS, it is usually because
it is being overloaded or improperly used.
RELEASE TRIGGER IMMEDIATELY, remove
drill bit from work, and determine cause of
stalling. DO NOT CLICK TRIGGER ON AND
OFF IN AN ATTEMPT TO START A STALLED
DRILL — THIS CAN DAMAGE THE DRILL.
7. To minimise stalling or breaking through the
material, reduce pressure on drill and ease the
bit through the last fractional part of the hole.
8. Keep the motor running when pulling the bit
back out of a drilled hole. This will help prevent
jamming.
9. With variable speed drills there is no need to
centre punch the point to be drilled. Use a
slow speed to start the hole and accelerate by
squeezing the trigger harder when the hole is
deep enough to drill without the bit skipping
out.
Hammerdrill Operation (DCD796 only)
(Fig. 1, 5)
1. Turn the collar (C) to the hammerdrill symbol.
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44
2. Select the high speed (2) setting by sliding the
gear shifter (D) back (away from the chuck).
IMPORTANT: Use carbide-tipped or masonry
bits only.
3. Drill with just enough force on the hammer to
keep it from bouncing excessively or "rising" off
the bit. Too much force will cause slower drilling
speeds, overheating and lower drilling rate.
4. Drill straight, keeping the bit at a right angle to
the work. Do not exert side pressure on the bit
when drillling as this will cause clogging of the
bit flutes and a slower drilling speed.
5. When drilling deep holes, if the hammer speed
starts to drop off, pull the bit partially out of the
hole with tool stil running to help clear debris
from the hole.
NOTE: A smooth, even flow of dust from the hole
indicates proper drilling rate.
Screwdriver Operation (Fig. 1, 6)
1. Turn the torque adjustment collar (C) to the
desired position.
2. Select the desired speed/torque range using
the gear shifter (D) to match the speed and
torque of the planned operation.
NOTE: Use the lowest torque setting required
to seat the fastener at the desired depth. The
lower the number, the lower the torque output.
3. Insert the desired fastener accessory into the
chuck as you would any drill bit.
4. Make some practice runs in scrap or on unseen
areas to determine the proper position of the
clutch collar.
5. Always start with lower torque settings, then
advance to higher torque settings to avoid
damage to the workpiece or fastener.
MAINTENANCE
Your D WALT power tool has been designed to
e
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular
cleaning.
WARNING: To reduce the risk of
serious personal injury, turn tool
off and disconnect battery pack
before making any adjustments or
removing/installing attachments or
accessories. An accidental start-up can
cause injury.
The charger and battery pack are not serviceable.