DeWalt DCF921 Guide D'utilisation page 11

specifications
Mode
Precision Wrench™ Precision Wrench™
Timber Screw™ Timber Screw™
Speed 1 Low Speed Impacting
Speed 2 High Speed Impacting
OPERATION

WARNING: To reduce the risk of serious personal
injury, turn unit off and remove the battery pack
before making any adjustments or removing/
installing attachments or accessories. An
accidental start‑up can cause injury.
Installing and Removing the Battery Pack
(Fig. F)
nOTE: For best results, make sure your battery pack is
fully charged.
To install the battery pack
battery pack with the rails inside the tool's handle and slide
it into the handle until the battery pack is firmly seated in the
tool and ensure that it does not disengage.
To remove the battery pack from the tool, press the release
button 4 and firmly pull the battery pack out of the tool
handle. Insert it into the charger as described in the charger
section of this manual.
Proper Hand Position (Fig. G)

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 10 .
Variable Speed Trigger Switch (Fig. A)
To turn the tool on, squeeze the trigger switch
tool off, release the trigger switch. Your tool is equipped with
a brake. The anvil will stop when the trigger switch is fully
released. The variable speed switch enables you to select the
best speed for a particular application. The more you squeeze
the trigger, the faster the tool will operate. For maximum tool
life, use variable speed only for starting holes or fasteners.
nOTE: Continuous use in variable speed range is not
recommended. It may damage the switch and should
be avoided.
Forward/Reverse Control Button (Fig. A)
A forward/reverse control button
of the tool and also serves as a lock‑off button.
Application
0‑2500 forward
0‑2500 reverse
0‑2500 forward
0‑2500 reverse
0‑1400 forward
0‑2500 reverse
0‑2500 forward
0‑2500 reverse
5 into the tool handle, align the
1 . To turn the
2 determines the direction
To select forward rotation, release the trigger switch and
depress the forward/reverse control button on the right side
RPM
of the tool.
To select reverse, release the trigger switch and depress the
forward/reverse control button on the left side of the tool.
The center position of the control button locks the tool in
the off position. When changing the position of the control
button, be sure the trigger is released.
nOTE: The first time the tool is run after changing the
direction of rotation, you may hear a click on start up. This is
normal and does not indicate a problem.
Worklight (Fig. A, D)
The worklight
speed trigger
switch
11
high illumination, and off.
nOTE: The worklight is for lighting the immediate work
surface and is not intended to be used as a flashlight.
Usage (Fig. A)

CAUTION: Ensure fastener and/or system will
withstand the level of torque generated by the tool.
Excessive torque may cause breakage and possible
personal injury.
1. Place the accessory on the fastener head. Keep the tool
pointed straight at the fastener.
2. Press variable speed trigger switch
Release variable speed trigger switch to stop operation.
Always check torque with a torque wrench, as the
fastening torque is affected by many factors including
the following:
Voltage: Low voltage, due to a nearly discharged
‑
battery, will reduce fastening torque.
‑ Accessory size: Failure to use the correct accessory
size will cause a reduction in fastening torque.
Bolt size: Larger bolt diameters generally require
‑
higher fastening torque. Fastening torque
will also vary according to length, grade, and
torque coefficient.
‑ Bolt: Ensure that all threads are free of rust and other
debris to allow proper fastening torque.
Material: The type of material and surface finish of
‑
the material will affect fastening torque.
‑ Fastening time: Longer fasten ing time results in
increased fastening torque. Using a longer fastening
time than recommended could cause the fasteners
to be overstressed, stripped or damaged.
is activated when the variable
6
is depressed. Pressing the worklight
1
repeatedly will cycle through low illumination,
English
1 to start operation.
9