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3. Hold tool firmly with both hands to control the twisting
action of the drill.
4. 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.
5. To minimize stalling or breaking through the material,
reduce pressure on drill and ease the bit through the
last fractional part of the hole.
6. Keep the motor running when pulling the bit back out
of a drilled hole. This will help prevent jamming.
Drilling in Metal
Start drilling with slow speed and increase to full power
while applying firm pressure on the tool. A smooth even
flow of metal chips indicates the proper drilling rate. Use a
cutting lubricant when drilling metals. The exceptions are
cast iron and brass which should be drilled dry.
nOTE: Large [5/16" (8 mm) to 1/2" (13 mm)] holes in steel
can be made easier if a pilot hole [5/32" (4 mm) to 3/16"
(5 mm)] is drilled first.
nOTE: When using a cutting lubricant, be sure not to get
the lubricant on the tool.
Drilling in Wood
Start drilling with slow speed and increase to full power
while applying firm pressure on the tool. Holes in wood can
be made with the same twist drills used for metal. These
bits may overheat unless pulled out frequently to clear chips
from the flutes. Work that is apt to splinter should be backed
up with a block of wood.
Drilling in Masonry
WARNING: Never drill into masonry which is
reinforced such as rebar reinforced concrete.
WARNING: For applications which produce a
considerable amount of dust such as core drilling,
always use an auxiliary dust attachment with an M
Class rated dust extractor such as DWV902M.
Use dry core bits. Keep even force on the drill but not so
much that you crack the brittle material. A smooth, even
flow of dust indicates the proper drilling rate.
Use sharp drill bits only. For masonry, such as brick, cement,
cinder block, etc., use dry diamond core bits
nOTE: Always use core bits designed for dry drilling.
10
Troubleshooting Drilling in Masonry
Problem
Core bit does not cut.
Material too hard for core bit.
Segments look glazed and polished • Drill in abrasive material to
Dust accumulating in core bit.
Accumulating dust slows down the
drilling speed.
Rotating speed may not be
appropriate.
Segments wear too fast.
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.
Your D
WALT power tool has been designed to operate
e
over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper
tool care and regular cleaning.
Repairs
The charger and batteries are not serviceable. There are no
serviceable parts inside the charger or battery pack.
WARNING: To assure product SAFETY and
RELIABILITY, repairs, maintenance and adjustment
(including brush inspection and replacement, when
applicable) should be performed by a factory service
center or an authorized service center. Always use
identical replacement parts.
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 ANSI Z87.1 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.
Solution
• Choose a more appropriate core bit
(with softer segments).
re-expose diamond segments.
• Disengage drill bit regularly to
evacuate cuttings. Check filter on
dust extraction. Clean or replace
as required.
• Refer to the Maximum
Recommended Capacities for
proper speed ratings.
• Choose a more appropriate core bit
(with harder segments).
• Reduce the pressure applied on
the core bit.
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