Maintenance; Optional Accessory - DeWalt DCF840 Instruction Manual

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.

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.
Your D WALT power tool has been designed to operate
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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 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 chemicals may weaken the plastic 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.
Accessories

WARNING: Since accessories, other than those offered
by D WALT, have not been tested with this product, use
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of such accessories with this tool could be hazardous.
To reduce the risk of injury, only D
accessories should be used with this product.
3 to start operation.
WALT recommended
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Recommended accessories for use with your tool are available
at extra cost from your local dealer or authorized service
center. If you need assistance in locating any accessory, please
contact D WALT call 1-800-4-D
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visit our website:www.dewalt.com.
Impact Accessories

WARNING: To reduce the risk of injury, use only
D WALT impact‑ready accessories.
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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.
Belt Hook (Fig. A)

Optional Accessory


WARNING: To reduce the risk of serious personal
injury, ONLY use the tool's belt hook to hang the
tool from a work belt. DO NOT use the belt hook
for tethering or securing the tool to a person or object
during use. DO NOT suspend tool overhead or suspend
objects from the belt hook.

WARNING: To reduce the risk of serious personal
injury, ensure the screw holding the belt hook
is secure.
iMPORTAnT: When attaching or replacing the belt hook,
use only the screw 9 that is provided. Be sure to securely
tighten the screw.
The belt hook can be be attached to either side of the
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tool using only the screw provided, to accommodate left- or
right- handed users. If the hook is not desired at all, it can be
removed from the tool.
To move belt hook, remove the screw that holds the belt
hook in place then reassemble on the opposite side. Be sure
to securely tighten the screw.
Repairs
The charger and battery pack are not serviceable. There are
no serviceable parts inside the charger or battery pack.

WARNING: To assure product SAFETY and RELIABILITY,
repairs, maintenance and adjustment (including brush
inspection and replacement, when applicable) should
be performed by a D
D WALT authorized service center. Always use identical
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replacement parts.
Register Online
Thank you for your purchase. Register your product now for:
• WARRAnTY sERViCE: Registering your product will help
you obtain more efficient warranty service in case there is
a problem with your product.
• COnFiRMATiOn OF OWnERshiP: In case of
an insurance loss, such as fire, flood or theft, your
registration of ownership will serve as your proof
of purchase.
English
WALT (1‑800‑433‑9258) or
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WALT factory service center or a
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