Bedienungsanleitung DeWalt DCH253 (Seite 17 von 60) (Englisch, Französisch, Spanisch)

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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. 4)

1. Turn the mode selector (D) to the rotary hammer symbol (K).

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. 4)

1. Set the mode selector switch (D) to the chipping symbol (L).

2. Insert the appropriate chisel and rotate it by hand to lock it into one

of 51positions.

3. Adjust the side handle (A) asrequired.

4. Switch on the tool and startworking.

5. Always switch off the tool when work is ﬁnished and

beforeunplugging.

MAINTENANCE

WARNING: To reduce the risk of serious personal injury, turn

tool off and disconnect tool from power source before making

any adjustments or removing/installing attachments or

accessories. An accidental start-up can causeinjury.

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 and proper NIOSH/

OSHA/MSHA respiratory protection when performingthis.

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.

CHARGER CLEANING INSTRUCTIONS

WARNING: Shock hazard. Disconnect the charger from the AC

outlet before cleaning. Dirt and grease may be removed from the

exterior of the charger using a cloth or soft non-metallic brush. Do not

use water or any cleaningsolutions.

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DeWalt DCH253 Seite 17

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