Maintenance - DeWalt DCF891 Instruction Manual

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 and firmly pull the battery pack out of the tool
5
handle. Insert it into the charger as described in the charger
section of this manual.
Proper Hand Position (Fig. E)

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
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.
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 (Fig. A, D)
The worklight is activated when the variable
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speed trigger is depressed. Pressing the worklight
1
switch repeatedly will cycle through low illumination,
8
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.
1 . To turn the
determines the direction
2
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.
specifications
Max. fastening torque
Precision Wrench™ mode: 600 ft-lbs, 812 Nm
Max. breakaway torque
No load speed
Impacts per minute
Length
Weight

MAINTENANCE


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, when
replacing line, or prior to cleaning. An accidental
start-up can cause injury.
Your D WALT power tool has been designed to operate
e
over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper tool
care and regular cleaning.
Cleaning

WARNING: Blow dirt and dust out of all air vents with
clean, dry air at least once a week. To minimize the
risk of eye injury, always wear approved eye protection
when performing this procedure.

WARNING: Never use solvents or other harsh
chemicals for cleaning the non-metallic parts of the
tool. These chemicals may weaken the plastic materials
used in these parts. Use a cloth dampened only with
ENglIsh
1 to start operation.
Low Mode: 100 ft-lbs, 136 Nm
Medium mode: 300 ft-lbs, 406 Nm
High mode: 600 ft-lbs, 812 Nm
800 ft-lbs, 1084 Nm
0–2000 rpm
0–3250 ipm
6.95" (177 mm)
3.7 lbs (1.67 kg)
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