Maintenance - DeWalt DCD791 Instruction Manual

ENGLISH

WARNING: 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.
4. Keep the motor running when pulling the bit back out of
a drilled hole to prevent jamming.
Recommendations for Drilling
• When drilling, always apply pressure in a straight line
with the bit, but do not push hard enough to stall the
motor or deflect the bit.
• IF THE DRILL STALLS:
- RELEASE TRIGGER SWITCH IMMEDIATELY,
remove drill bit from work, and determine cause
of stalling.
DO NOT DEPRESS TRIGGER SWITCH ON AND OFF
-
IN AN ATTEMPT TO START A STALLED DRILL—
THIS CAN DAMAGE THE DRILL.
- To minimize stalling or breaking through the material,
reduce pressure on drill and ease the bit through the
last fractional part of the hole.
• Large holes (5/16" to 1/2" [7.9 mm to 12.7 mm]) in steel
can be made easier if a pilot hole (5/32" to 3/16" [4 mm
to 4.8 mm]) is drilled first.
• If drilling thin material or material that is prone to splinter,
use a wood "back-up" block to prevent damage to
the workpiece.
Hammerdrilling
DCD796
IMPORTANT: Use carbide-tipped or masonry bits rated for
percussion drilling only.
1. Select the desired speed/torque range using the speed
selector 4 to match the speed and torque to the
planned operation. Turn the mode selection collar
the hammerdrill symbol.
2. Pull the trigger, applying just enough pressure on the
hammer to keep it from bouncing excessively or "rising"
off the bit.
Recommendations for Hammerdrilling
• Too much force will cause slower drilling speeds,
overheating, and a lower drilling rate.
• A smooth even flow of material indicates the proper
drilling rate.
• 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.
• When drilling deep holes, if the hammer speed starts to
drop off, pull the bit partially out of the hole with tool still
running to help clear debris from the hole.

MAINTENANCE


WARNING: To reduce the risk of serious personal
injury, turn unit off and remove the battery pack
before making any adjustments or removing/
installing attachments or accessories. An
accidental start-up can cause injury.
30
Your D WALT power tool has been designed to operate
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over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper tool
care and regular cleaning.
Cleaning

WARNING: Blow dirt and dust out of all air vents with
clean, dry air at least once a week. To minimize the
risk of eye injury, always wear approved eye protection
when performing this procedure.

WARNING: Never use solvents or other harsh
chemicals for cleaning the non-metallic parts of the
tool. These chemicals may weaken the plastic materials
used in these parts. Use a cloth dampened only with
water and mild soap. Never let any liquid get inside the
tool; never immerse any part of the tool into a liquid.
Accessories

WARNING: Since accessories, other than those offered
by D WALT, have not been tested with this product, use
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of such accessories with this tool could be hazardous.
To reduce the risk of injury, only D
accessories should be used with this product.
Recommended accessories for use with your tool are
available at extra cost from your local dealer or authorized
service center.
Repairs
The charger and battery pack are not serviceable.

WARNING: To assure product SAFETY and RELIABILITY,
repairs, maintenance and adjustment (including brush
inspection and replacement) should be performed by a
D WALT factory service center or a D
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3 to
service center. Always use identical replacement parts.
DCD791 20V Max*
DCD796 20V Max*
WALT recommended
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WALT authorized
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SPECIFICATIONS
0–550 / 0–2000 RPM
0–550 / 0–2000 RPM;
0–9350 / 0–34000 BPM