DeWalt D21720 Manual Del Usuario página 24

E N G L I S H
Percussion drilling:
simultaneous rotating and impacting for
concrete and masonry drilling operations.
• Select the required operating mode by rotating
the mode selector (5) to the required position.
Inserting and removing a bit (fi g. A)
Keyless chuck
• Open the chuck by turning the sleeve (9)
counterclockwise and insert the bit shank.
• Tighten fi rmly by turning the sleeve clockwise.
Keyed chuck
• Open the chuck by turning the sleeve (9)
counterclockwise and insert the bit shank.
• Put the chuck key (10) into each hole in the side
of the chuck and turn clockwise until tight.
• To remove the bit, proceed in reverse order.
Fitting the side handle (fi g. A)
The side handle (6) can be fi tted to suit both RH-
and LH-users.
WARNING: Always use the Drill with the
side handle properly assembled.
• Loosen the side handle.
• For RH-users, slide the side handle clamp over
the collar behind the chuck, handle at the left.
• For LH-users, slide the side handle clamp over
the colar behind the chuck, handle at the right.
• Rotate the side handle to the desired position
and tighten the handle.
Setting the drilling depth (fi g. C)
• Insert the required drill bit into the chuck.
• Slacken the side handle (6).
• Fit the depth adjustment rod (7) through the hole
in the side handle clamp.
• Adjust the drilling depth as shown.
• Tighten the side handle.
Forward/reverse slider (fi g. A)
• To select forward or reverse rotation, use the
forward/reverse-switch (3) (see arrow on tool).
22
WARNING: Always wait until the motor
has come to a complete standstill before
changing the direction of rotation.
Two gear selector (fi g. D)
This tool is fi tted with a two gear selector (4) to vary
the speed/torque ratio.
• Release the ON/OFF-switch and select the
required position as the drill coasts to a stop.
Always align the selector arrow with the gear
symbol on the gear housing:
1 low speed/high torque
(drilling large holes or driving large screws)
2 high speed/low torque
(smaller holes, drilling in wood)
For speed rates, refer to the technical data.
WARNING: Do not change gears at full
speed or during use.
Chuck removal (fi g. E & F)
• Open the chuck jaws as far as possible.
• Insert a screwdriver into the chuck and remove
the chuck retaining screw (12) by turning
clockwise.
• Tighten an Allen key into the chuck and strike it
with a hammer as shown.
Instructions for use
WARNING:
• Always observe the safety instructions
and applicable regulations.
• Be aware of the location of pipework
and wiring.
• Apply only a gentle pressure to the tool.
Excessive force does not speed up
drilling but decreases tool performance
and may shorten tool life.
Prior to operation:
• Insert the appropriate bit.
• Mark the spot where the hole is to be drilled.
Switching ON and OFF (fi g. A)
• To run the tool, press the variable speed switch.
The pressure exerted on the variable speed
switch determines the tool speed.