Maintenance - DeWalt DCF902 Instruction Manual

control in both fastening and loosening applications.
When set in forward, the tool will fasten until impact
begins. The tool will then pause for 0.5 seconds before
continuing to impact, providing the user with greater
control and reducing the chance of overtightening or
damaging material.
When set in reverse, the tool will impact at a normal speed.
Upon sensing that the fastener has broken free, the tool will
cease to impact and will reduce speed to help prevent "run-
off" of loose hardware.
Precision Wrench™ Mode
Lo Mode
Hi Mode
Installing and Removing the Battery Pack (Fig. D)
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.
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 14 .
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
depressed, 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, release the trigger and depress
the forward/reverse control button on the right side of
the tool.
• To select reverse, 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.
DCF902
Precision Wrench™
Low Speed Impacting
High Speed Impacting
1 into the tool handle, align the
3 . The farther the trigger is
4 determines the
Worklights (Fig. F)

CAUTION: Do not stare into worklights. Serious eye
injury could result.
The worklights 6 are located around the quick release
chuck or anvil. The worklights are activated when the trigger
is depressed. If the trigger switch remains depressed, the
worklights will remain on.
The beam will automatically turn off 20 seconds after the
trigger switch is released.
nOTE: The worklights are for lighting the immediate work
surface and are not intended to be used as a flashlight.
Usage (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 con tains no cracks.

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 # Nm
DCF801 163.8
DCF902 169.5

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. An accidental start-up can
cause injury.
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 ANSI Z87.1 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
English
3 to start operation.
Ft.-Lbs. In.-Lbs
120.8 1450
125 1500
7