DeWalt D21720 User manual
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®
D21720
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Copyright DEWALT
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ENGLISH
PERCUSSION DRILL D21720
Congratulations!
You have chosen a DEWALT Power Tool. Years of
experience, thorough product development and
innovation make DEWALT one of the most reliable
partners for professional Power Tool users.
Technical data
D21720
Voltage -B1 V 220-240
Power input W 650
No load speed
1st gear min
-1
0-1,100
2nd gear min
-1
0-2,600
No load impact
1st gear min
-1
0-19,000
2nd gear min
-1
0-44,200
Maximum drilling range in
steel/softwood/concrete mm 13/25/16
Chuck spindle thread size UNF 1/2" x 20
Collar diameter mm 43
Maximum chuck capacity mm 13
Weight kg 2.1
Fuses:
220-240 V tools 10 Amperes, mains
115 V tools 13 Amperes, mains
The following symbols are used throughout this manual:
Denotes risk of personal injury, loss of life
or damage to the tool in case of non-
observance of the instructions in this
manual.
Denotes risk of electric shock.
Safety instructions
When using Power Tools, always observe the
safety regulations applicable in your country to
reduce the risk of fire, electric shock and
personal injury. Read the following safety
instructions before attempting to operate this
product. Keep these instructions in a safe place!
General
1 Keep work area clean
Cluttered areas and benches can cause accidents.
2 Consider work area environment
Do not expose Power Tools to humidity.
Keep work area well lit. Do not use Power Tools
in the presence of inflammable liquids or gases.
3 Guard against electric shock
Prevent body contact with earthed surfaces
(e.g. pipes, radiators, cookers and refrigerators).
For use under extreme conditions (e.g. high
humidity, when metal swarf is being produced,
etc.) electric safety can be improved by inserting
an isolating transformer or a (FI) earth-leakage
circuit-breaker.
4 Keep children away
Do not let children come into contact with the
tool or extension cord. Keep all people away
from the work area.
5 Extension cords for outdoor use
When the tool is used outdoors, always use
extension cords intended for outdoor use and
marked accordingly.
6 Store idle tools
When not in use, Power Tools must be stored in
a dry place and locked up securely, out of reach
of children.
7 Dress properly
Do not wear loose clothing or jewellery.
They can be caught in moving parts.
Preferably wear rubber gloves and non-slip
footwear when working outdoors. Wear protective
hair covering to keep long hair out of the way.
8 Wear safety goggles
Also use a face or dust mask in case the
operations produce dust or flying particles.
9 Beware of maximum sound pressure
Wear ear protection at all times.
8
ENGLISH
10 Secure workpiece
Use clamps or a vice to hold the workpiece. It is
safer and it frees both hands to operate the tool.
11 Do not overreach
Keep proper footing and balance at all times.
12 Avoid unintentional starting
Do not carry the plugged-in tool with a finger on
the switch.
Be sure that the switch is released when plugging in.
13 Stay alert
Watch what you are doing. Use common sense.
Do not operate the tool when you are tired.
14 Disconnect tool
Shut off power and wait for the tool to come to a
complete standstill before leaving it unattended.
Unplug the tool when not in use, before servicing
or changing accessories.
15 Remove adjusting keys and wrenches
Always check that adjusting keys and wrenches are
removed from the tool before operating the tool.
16 Use appropriate tool
The intended use is laid down in this instruction
manual. Do not force small tools or attachments
to do the job of a heavy-duty tool. The tool will
do the job better and safer at the rate for which it
was intended.
Warning! The use of any accessory or
attachment or performance of any operation with
this tool, other than those recommended in this
instruction manual may present a risk of personal
injury.
17 Do not abuse cord
Never carry the tool by its cord or pull it to
disconnect from the socket. Keep the cord away
from heat, oil and sharp edges.
18 Maintain tools with care
Keep the tools in good condition and clean for
better and safer performance.
Follow the instructions for maintenance and
changing accessories. Inspect the tool cords at
regular intervals and, if damaged, have them
repaired by an authorized DEWALT repair agent.
Inspect the extension cords periodically and
replace them if damaged. Keep all controls dry,
clean and free from oil and grease.
19 Check for damaged parts
Before using the tool, carefully check it for
damage to ensure that it will operate properly
and perform its intended function.
Check for misalignment and seizure of moving
parts, breakage of parts and any other conditions
that may affect its operation. Have damaged
guards or other defective parts repaired or
replaced as instructed.
Do not use the tool if the switch is defective.
Have the switch replaced by an authorized
DEWALT repair agent.
20 Have your tool repaired by an authorized
DEWALT repair agent
This Power Tool is in accordance with the
relevant safety regulations. To avoid danger,
electric appliances must only be repaired by
qualified technicians.
Package contents
The package contains:
1 Rotary/percussion drill
1 Side handle
1 Depth gauge
1 Chuck key
1 Kitbox (K-models only)
1 Instruction manual
• Check for damage to the tool, parts or accessories
which may have occurred during transport.
• Take the time to thoroughly read and understand
this manual prior to operation.
Description (fig. A)
1 Variable speed switch
2 Lock-on button
3 Forward/reverse slider
4 Two gear selector
5 Mode selector
6 Side handle
7 Depth adjustment rod
8 Keyed chuck
9 Sleeve
10 Chuck key
11 Suspension bracket
Electrical safety
The electric motor has been designed for one
voltage only. Always check that the power supply
corresponds to the voltage on the rating plate.
9
ENGLISH
Your DEWALT tool is double insulated in
accordance with IEC60745; therefore no
earth wire is required.
Using an extension cable
If an extension cable is required, use an approved
extension cable suitable for the power input of this
tool (see technical data). The minimum conductor
size is 1.5 mm2. When using a cable reel, always
unwind the cable completely.
Also refer to the table below.
Conductor size (mm
2
) Cable rating (Amperes)
0.75 6
1.00 10
1.50 15
2.50 20
4.00 25
Cable length (m)
7.5 15 25 30 45 60
Voltage Amperes Cable rating (Amperes)
115 6 6 6 6 6 10
2.1 - 3.4 6 6 6 6 15 15
3.5 - 5.0 6 6 10 15 20 20
5.1 - 7.0 10 10 15 20 20 25
7.1 - 12.0 15 15 20 25 25 -
12.1 - 20.0 20 20 25 - - -
220-240 0 - 2.0
0 - 2.0
66 66 6 6
2.1 - 3.4 6 6 6 6 6 6
3.5 - 5.0 6 6 6 6 10 15
5.1 - 7.0 10 10 10 10 15 15
7.1 - 12.0 15 15 15 15 20 20
12.1 - 20.0 20 20 20 20 25 -
Assembly and adjustment
Prior to assembly and adjustment always
unplug the tool.
Selecting the operating mode (fig. B)
Percussion drill can be used in two operating modes:
Rotary drilling:
for steel, wood and plastics.
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 (fig. A)
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 (fig. A)
The side handle (6) can be fitted to suit both RH-
and LH-users.
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 (fig. 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 (fig. A)
• To select forward or reverse rotation, use the
forward/reverse-switch (3) (see arrow on tool).
Always wait until the motor has come to
a complete standstill before changing the
direction of rotation.
Two gear selector (fig. D)
This tool is fitted with a two gear selector (4) to vary
the speed/torque ratio.
10
ENGLISH
• 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:
1low speed/high torque
(drilling large holes or driving large screws)
2high speed/low torque
(smaller holes, drilling in wood)
For speed rates, refer to the technical data.
Do not change gears at full speed or
during use.
Chuck removal (fig.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
• 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
Wear ear protectors with impact drills.
Exposure to noise can cause hearing
loss.
Use auxiliary handles supplied with the
tool. Loss of control can cause personal
injury.
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 (fig. A)
• To run the tool, press the variable speed switch.
The pressure exerted on the variable speed
switch determines the tool speed.
Screwdriving
• Select forward or reverse rotation.
• Use the low speed/high torque position
(1st gear).
Percussion drilling (fig. A)
• Select the percussion mode.
• Press the switch (1).
• If necessary, press the lock-on button (2) for
continuous operation and release the switch.
The lock-on button works only in full speed,
forward rotation.
• To stop the tool, release the switch.
• To stop the tool in continuous operation, press
the switch briefly and release it. Always switch
OFF the tool when work is finished and before
unplugging.
Rotary drilling (fig. A)
• Select the rotary drilling mode.
• Proceed as described for percussion drilling.
Consult your dealer for further information on the
appropriate accessories.
Maintenance
Your DEWALT Power Tool has been designed to
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular cleaning.
Lubrication
Your Power Tool requires no additional lubrication.
Cleaning
Keep the ventilation slots clear and regularly clean
the housing with a soft cloth.
Unwanted tools and the environment
Take your tool to an authorized DEWALT repair
agent where it will be disposed of in an
environmentally safe way.
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