DeWalt DCH417 Original Instructions Manual page 14

English
installing attachments or accessories. An accidental
start‑up can cause injury.
Proper Hand Position (Fig. A, H)

WARNING: To reduce the risk of serious personal injury,
ALWAYS use proper hand position as shown.

WARNING: To reduce the risk of serious personal
injury, ALWAYS hold securely in anticipation of a
sudden reaction.
Proper hand position requires one hand on the main handle
with the other hand on the side handle
Operation Modes (Fig. A)

WARNING: Do not select the operating mode when the
tool is running.
Your tool is equipped with a mode selector dial
mode appropriate to desired operation.
symbol Mode
Rotary Drilling
Rotary
hammering
hammering
only
To select an Operating Mode
1. Depress the mode selector release button
2. Rotate the mode selector dial
the symbol corresponding with the desired mode.
nOTE: The mode selector dial
rotary hammering or hammering only mode at all times. There
are no operable positions in between. It may be necessary to
briefly run the motor after having changed from 'hammering
only' to 'rotary' modes in order to align the gears.
Performing an Application (Fig. A)

WARNING: TO REDUCE THE RISK OF PERSONAL
INJURY, ALWAYS ensure workpiece is anchored or
clamped firmly. If drilling thin material, use a wood
"back‑up" block to prevent damage to the material.

WARNING: Always wait until the motor has come to
a complete standstill before changing the direction
of rotation.
1. Choose and install the appropriate chuck, adapter, and/or
bit onto to the tool. Refer to Bit and Bit Holders.
2. Using the mode selector dial
appropriate to desired application. Refer to
Operation Modes.
3. Adjust the side handle
4. Place the bit/chisel on the desired location.
5. Select the direction of rotation using the forward/reverse
button 2 . When changing the position of the control
12
.
5
3 to select the
Application
Screwdriving
Drilling into steel, wood
and plastics
Drilling into concrete and
masonry
Light chipping
4 .
3 so that the arrow points to
3 must be in rotary drilling,
3 , select the mode
5 as required.
button, be sure the trigger is released and motor has come
to a complete stop.
‑ To select forward rotation, press the for ward/re verse
control button on the right side of the tool.
‑ To select reverse, press the forward/reverse control
button on the left side of the tool.
nOTE: The center position of the control button locks
the tool in the off position.
6. Depress the trigger switch
8 ,
the trigger switch, the faster the tool will operate. For
maximum tool life, use variable speed only for starting holes
or fasteners.
nOTE: Depending on your tool, depressing the trigger
switch activates a worklight
immediate work surface. The worklight will automatically
turn off 20 seconds after the trigger switch is released.

WARNING:
• Do not use this tool to mix or pump easily combustible
or explosive fluids (benzine, alcohol, etc.).
• Do not mix or stir inflammable liquids
labelled accordingly.
DUST

WARNING: Before performing an operation with this tool,
check the hazard classification of the dust that will be
produced while drilling or construction activity.
As much as possible, use a DEWALT dust extraction system
suitable for the material being worked on.
• Some dusts generated during drilling and other
construction activities can be dangerous. Examples are:
‑ Crystalline silica from bricks and cement and other
masonry products
Lead‑containing coatings
‑
Some wood types such as oak and beech and arsenic
‑
and chromium from chemically treated lumber.
• Contact with or inhalation of the dust may cause cancer,
birth defects, allergic reactions and/or respiratory or other
diseases to the operator or bystanders.
• To achieve a high level of dust collection, use a suitable
vacuum cleaner.
• When indicated, wear a respirator appropriate for the type
of dust generated.
• Ensure that the workplace is well ventilated.
• Material containing asbestos may be handled only by specialists.
• Observe the relevant guidelines and national regulations for
your material, staff, application and place of application
(e.g. occupational health and safety regulations, disposal).
1 . The farther you depress
13 designed to illuminate the