Installing And Removing The Battery Pack - DeWalt DCF850 Instruction Manual

20v max 1/4" (6.35 mm) brushless cordless impact driver
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The lanyard attachment point
appropriate lanyards with locking carabiner ends for use at
height, 6.5 ft (2 m) maximum length, rated for at least the
weight identified on the tool lanyard attachment point label.
Refer to Figure D.
Installing the Battery Strap Carabiner to
the Lanyard Attachment Point

WARNING: DO NOT attach the lanyard to the battery
strap. Lanyards should only be attached to the lanyard
attachment point.
The carabiner at the end of the battery strap
opened and then attached to the lanyard attachment point.
To open the carabiner:
1. Install battery into tool.
2. Flip open the carabiner tab
3. Pull the tab upward.
4. Move the carabiner locking arm
5. Attach the carabiner locking arm to the lanyard
attachment point
 11 
6. Move the locking arm back into place, push the tab back
down so the pin engages the locking arm.
7. The tool is now ready for a lanyard. Refer to Figure D.
Quick-Release Chuck (Fig. A, J)

WARNING: Use only impact accessories. Non‑impact
accessories may break and cause a hazardous
condition. Inspect accessory prior to use to ensure that
it con tains no cracks.
nOTE: The chuck
accepts 1/4" (6.35 mm) hex accessories
 6 
and 1" (25.4 mm) bit tips only.
Place the forward/reverse button
(center) position and remove battery pack before
changing accessories.
To install an accessory, fully insert the accessory. The
accessory is locked into place (Fig. J).
To remove an accessory, pull the chuck collar
the front of the tool. Remove the accessory (Fig. J).
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. H)
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 
 2 
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.
10
 11 
is for attaching
 12 
, should be
 13 
.
 14 
out to open.
.
 4 
in the lock-off
 5 
 1 
into the tool handle, align the
Proper Hand Position (Fig. I)

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 
 15 
Variable Speed Trigger and Forward/
Reverse Control Button (Fig. A)
The tool is turned on and off by pulling and releasing the
variable speed trigger 
the higher the speed of the tool. Your tool is equipped with
a brake. The chuck will stop as soon as the trigger switch is
fully released.
A forward/reverse control button 
rotational direction of the tool and also serves as a
lock-off button.
To select forward rotation (clockwise), release the trigger
and depress the forward/reverse control button on the
right side of the tool.
To select reverse (counterclockwise), depress the
forward/reverse control button on the left side of
the tool.
nOTE: 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: Continuous use in variable speed range is not
recommended. It may damage the switch and should
be avoided.
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.
Worklights (Fig. A)

CAUTION: Do not stare into worklight. Serious eye
away from
injury could result.
There are three worklights
collar 
. The worklights are activated when the trigger
 5 
switch is depressed. When the trigger is released, the
worklight will stay illuminated for up to 20 seconds. If
the trigger switch remains depressed, the worklights will
remain on.
nOTE: The worklights are for lighting the immediate work
surface and are 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
.
. The farther the trigger is depressed,
 3 
 4 
located around the chuck
 8 
determines the
to start operation.
 3 

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