DeWalt DCF899 Instructions Manual page 19

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.
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
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
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.
Worklight (Fig. A)
The worklight is activated when the trigger switch is
7
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.
Speed Selector (Fig. A)
Your tool is equipped with a speed selector
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
SPEED 2
SPEED 3
. To turn the
1
2 determines the direction of
which allows
10
0–400 rpm
0–1200 rpm
0–1900 rpm
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
the accessory on until the detent pin engages in the hole.
Depression of detent pin may be necessary to aid installation
.
4
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
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.
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.
Your impact tool can generate the following maximum torque:
Cat #
DCF899, DCF899H
MAINTENANCE
Your power tool has been designed to operate over a long
on the anvil
8
3 . The hog ring 9 compresses to
to start operation.
1
Nm Ft.-Lbs.
950 700
EngLIsH
. Press
3
In.-Lbs.
8400
19