DeWalt XR LI-ION DCF889 Operator's Manual page 12

EN GLI SH
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 (d).
Variable Speed Trigger Switch (fi g. 1)
To turn the tool on, squeeze the trigger switch
(a). To turn the 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
(fi g. 1)
A forward/reverse control button (b) determines the
direction of the tool and also serves as a lock-off
button.
To select forward rotation, release the trigger switch
and depress the forward/reverse control button on
the right side 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 (fi g. 1)
There is a worklight (g) located above the trigger
switch (a). The worklight is activated when the
trigger switch is depressed. When the trigger is
released, the worklight will stay illuminated for up to
20 seconds.
NOTE: The worklight is for lighting the immediate
work surface and is not intended to be used as a
flashlight.
36
Anvil (fi g. 2)
WARNING: Use only impact
accessories. Non-impact accessories
may break and cause a hazardous
condition. Inspect accessory prior to
use to ensure that it contains no cracks.
CAUTION: Inspect anvils and detent
pins prior to use. Missing or damaged
items should be replaced before use.
Place the switch in the locked off (center) position or
remove battery pack before changing accessories.
ANVIL WITH DETENT PIN (FIG. 2)
To install an accessory on the anvil, align the hole in
the side of the accessory with the detent pin (h) on
the anvil (c). Press the accessory on until the detent
pin engages in the hole. Depression of detent pin
may be necessary to aid installation of accessory.
To remove an accessory, depress the detent pin
through the hole and pull the accessory off.
Usage
Your impact tool can generate the following
maximum torque:
Cat # Ft.-Lbs.
DCF889 300
WARNING: 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 switch to start operation. Release 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.
In.-Lbs. Nm
3600 418