Hammerdrill Operation; Maintenance; Cleaning - DeWalt DCD771 Original Instructions Manual

En g li sh
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.
1. Turn the collar (c) to the drill symbol.
2. Select the desired speed/torque range using the
gear shifter 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 minimize 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
center 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.
12
Hammerdrill operation (fig. 6)
dCd776
1. Turn the collar (c) to the hammerdrill symbol.
2. Select the high speed setting by sliding the
selector 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.

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.
There are no serviceable parts inside.
lubrication
Your power tool requires no additional lubrication.

Cleaning

WARNING: Blow dirt and dust out of
the main housing with dry air as often as
dirt is seen collecting in and around the
air vents. Wear approved eye protection
and approved dust mask when
performing this procedure.