DeWalt DCF899 - Page 19

19
ENGLISH
Your impact tool can generate the following maximum torque:
Cat # Nm Ft.-Lbs. In.-Lbs.
DCF899, DCF899H 950 700 8400
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
1
to start operation.
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.
Speed Selector (Fig.A)
Your tool is equipped with a speed selector
10
which allows
you to select one of three speeds. Select the speed based on the
application and control the speed of the tool using the variable
speed trigger switch
1
.
SPEED 1 0–400 rpm
SPEED 2 0–1200 rpm
SPEED 3 0–1900 rpm
Worklight (Fig.A)
The worklight
7
is activated when the trigger switch is
depressed, and will automatically turn off 20seconds after
the trigger switch is released. If the trigger switch remains
depressed, the worklight will remainon.
NOTE: The worklight is for lighting the immediate work surface
and is not intended to be used as aflashlight.
Forward/Reverse Control Button (Fig.A)
A forward/reverse control button
2
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 centre 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.
Variable Speed Trigger Switch (Fig.A)
To turn the tool on, squeeze the trigger switch
1
. 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.
Proper Hand Position (Fig.C)

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
4
.
OPERATION
Instructions for Use

WARNING: Always observe the safety instructions and
applicableregulations.

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.
Anvil (Fig.A)

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, detent pins, and hog rings prior to
use. Missing or damaged items should be replaced beforeuse.
Place the switch in the locked off (centre) position or remove
battery pack before changingaccessories.
Anvil with Detent Pin (Fig.A)
DCF899
To install an accessory on the anvil, align the hole in the side
of the accessory with the detent pin
8
on the anvil
3
. 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.
Anvil With Hog Ring (Fig.A)
DCF899H
To install an accessory on the hog ring anvil, firmly push
accessory onto the anvil
3
. The hog ring
9
compresses to
allow the accessory to slide on. After accessory is installed, the
hog ring applies pressure to help provide accessoryretention.
To remove an accessory, grasp the accessory and firmly pull
itoff.
MAINTENANCE
Your power tool has been designed to operate over a long