Maintenance - DeWalt DCF840N-XJ Original Instructions Manual

EnGLIsh
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, 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.
Worklights (Fig. A)
There are worklights 7 located above the trigger switch
The worklights will be activated when the trigger switch
is depressed.
When the trigger is released, the worklights 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.
Quick-Release Chuck (Fig. A, C)

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 6.35 mm hex accessories and
25 mm bit tips only. Using 25 mm bits allows better access in
tight spaces.
Place the forward/reverse button
position or remove battery pack before changing accessories.
To install an accessory, push accessory to fully insert into
chuck 4 . The chuck collar 3
lock accessory in place.
To remove an accessory, pull the chuck collar away from the
front of the tool. Remove the accessory and release the collar.
Usage
Your impact tool generates the following maximum torque:
Cat # Nm
DCF840 192

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 switch to start operation. Release the 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.
32
2 in the locked off (centre)
does not need to be pulled up to
Ft.-Lbs. In.-Lbs
142.6 1700
• 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 recom mended could cause the fasteners to
be overstressed, stripped or damaged.
1 .

MAINTENANCE

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.

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.
The charger and battery pack are not serviceable.
Lubrication
Your power tool requires no additional lubrication.
Cleaning

WARNING: Blow dirt and dust out of the main housing
with dry air as often as dirt is seen collecting in and around
the air vents. Wear approved eye protection and approved
dust mask 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 materials used in these parts.
Use a cloth dampened only with water and mild soap.
Never let any liquid get inside the tool; never immerse any
part of the tool into a liquid.
Optional Accessories

WARNING: Since accessories, other than those offered by
D WALT, have not been tested with this product, use of
e
such accessories with this tool could be hazardous.

WARNING: Use only impact accessories. Non-impact
accessories may break and cause a hazardous condition.
Inspect accessories prior to use to ensure that they contain
no cracks.
Consult your dealer for further information on the
appropriate accessories.