Prior To Operation - DeWalt DC901 Instructions Manual

2. Rotate the mode control collar (5) so the screw
symbol is aligned with the arrow.
3. Set the torque adjustment collar (4) to the
appropriate number setting for the torque
desired.
NOTE: The torque adjustment collar may
be set on any number and change between
screwdriving and drilling modes using the mode
control collar.
DRILLING (FIG. D1)
CAUTION: When the mode collar is in
the drill/hammerdrill mode, the drill will not
clutch out regardless of the position of the
torque adjustment collar (4).
Rotate the mode control collar (5) so the drill symbol
is aligned with the arrow.
NOTE: The torque adjustment collar (4) may be set
on any number.
HAMMERDRILLING (FIG. D2)
Rotate the mode control collar (5) so the hammer
symbol is aligned with the arrow.
Torque Adjustment Collar (fi g. D)
Your tool has an adjustable torque screwdriver
mechanism for driving and removing a wide array of
fastener shapes and sizes and a hammer mechanism
for drilling into masonry. Circling the torque adjustment
collar (4) are numbers. These numbers are used to
set the clutch to deliver a torque range. The higher
the number on the collar, the higher the torque and
the larger the fastener which can be driven. To select
any of the numbers, rotate until the desired number
aligns with the arrow.
WARNING: Do not select the operating
mode when the tool is running.
Forward/Reverse Slider (fi g. E)
• To select forward or reverse rotation, use the
forward/reverse slider (2) as shown (see arrows
on tool).
WARNING: Always wait until the motor
has come to a complete standstill before
changing the direction of rotation.
Three-Gear Selector (fi g. F)
Your tool is fitted with a three-gear selector (6) to vary
the speed/torque ratio.
1 low speed/high torque
2 medium speed/medium torque
3 high speed/low torque
For speed rates, refer to the technical data.
• Do not change gears at full speed or during use.
Keyless Single Sleeve Chuck
(fi g. C)
WARNING: Do not attempt to tighten
drill bits (or any other accessory) by
gripping the front part of the chuck and
turning the tool on. Damage to the chuck
and personal injury may result. Always
lock off trigger switch and disconnect
tool from power source when changing
acces sories.
WARNING: Always ensure the bit is
secure before starting the tool. A loose
bit may eject from tool causing possible
personal injury.
Your tool features a keyless chuck with one rotating
sleeve for one-handed operation of the chuck. To
insert a drill bit or other accessory, follow these steps.
1. Turn off tool and disconnect tool from power
source.
2. Grasp the black sleeve of the chuck (3) with
one hand and use the other hand to secure the
tool as shown in Figure C. Rotate the sleeve
counterclockwise far enough to accept the
desired accessory.
3. Insert the accessory about 19 mm (3/4") into the
chuck. Tighten securely by rotating the chuck
sleeve clockwise with one hand while holding the
tool with the other hand. Continue to rotate the
chuck sleeve until several ratchet clicks are heard
to ensure full gripping power.
Be sure to tighten chuck with one hand on the chuck
sleeve and one hand holding the tool for maximum
tightness.
To release the accessory, repeat Steps 1 and 2
above.

Prior to Operation

• Make sure your battery pack is (fully) charged.
• Make sure the battery pack is properly seated.
• Insert the appropriate bit.
• Mark the spot where the hole is to be drilled.
OPERATION
WARNING: To reduce the risk of
serious personal injury, turn tool
off and disconnect battery pack
before making any adjustments or
removing/installing attachments or
accessories. An accidental start-up can
cause injury.
ENGLISH
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