DeWalt DCH253 Manual De Instrucciones página 13

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. For
MASONRY, such as brick, cement, cinder block, etc., use
carbide‑tipped bits rated for percussion drilling.
3. 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.
4. 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.

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.
5. 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 depress TRIGGER ON AND OFF
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 the hole.
7. Keep the motor running when pulling the bit back out of
a drilled hole. This will help prevent jamming.
8. 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.
Drilling in Metal
An SDS plus® to round shank adaptor chuck is required.
Ensure that tool is in drill‑only mode. 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" to 1/2" [7.9 mm to 12.7 mm]) holes in
steel can be made easier if a pilot hole (5/32" to 3/16" [4 mm
to 4.8 mm]) is drilled first.
Drilling in Wood
An SDS plus® to round shank adaptor chuck is required.
Ensure that tool is in drill‑only mode. 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. For larger holes,
use spade bits, power auger bits, or hole saws. Work that is
apt to splinter should be backed up with a block of wood.
Drilling in Masonry
When drilling in masonry, use carbide‑tipped bits rated for
percussion drilling and be certain that the bits are sharp. Use
a constant and firm force on the tool to drill most effectively.
A smooth, even flow of dust indicates the proper drilling rate.
Hammerdrill Operation (Fig. J)
1. Turn the mode selector
symbol 15 .
2. When drilling, use 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 a lower drilling rate.
3. Drill straight, keeping the bit at a right angle to the work.
Do not exert side pressure on the bit when drilling as
this will cause clogging of the bit flutes and a slower
drilling speed.
4. When drilling deep holes, if the hammer speed starts to
drop off, pull the bit partially out of the hole with the tool
still running to help clear debris from the hole.
5. For masonry, use carbide‑tipped bits or masonry
bits. A smooth even flow of dust indicates the proper
drilling rate.
Chipping and Chiselling (Fig. J)
1. To select chipping mode, adjust the mode selector
knob 5 to the hammer symbol
2. Insert the appropriate chisel into the chuck and rotate it
by hand to lock it into one of 51 positions.
3. Adjust the side handle
4. Switch on the tool and start working.
5. Always switch off the tool when work is finished.
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.
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.
English
5 to the rotary hammer
16 .
1 as required.
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