DeWalt DCF850 Traducido De Las Instrucciones Originales página 20

EnGLIsh
IMPORTanT: When attaching or replacing the belt hook or
magnetic bit holder, use only the screw
sure to securely tighten the screw.
The belt hook and magnetic bit holder
8
to either side of the tool using only the screw
to accommodate left- or right- handed users. If the hook or
magnetic bit holder is not desired at all, it can be removed from
the tool.
To move belt hook or magnetic bit holder, remove the screw
that holds it in place then reassemble on the opposite side. Be
sure to securely tighten the screw.
OPERATION
Instructions for Use

WARNING: Always observe the safety instructions and
applicable regulations.

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.
Proper Hand Position (Fig. A, C)

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 .
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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 tool will stop when the trigger switch is fully released.
The variable speed switch enables you to start the application at
a slow speed. The further 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
the tool and also serves as a lock-off button.
To select forward rotation, release the trigger switch
depress the forward/reverse control button
of the tool.
To select reverse, release the trigger switch
the forward/reverse control button
tool. The centre position of the control button locks the trigger
switch 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 three worklights 7
chuck 4 . The worklights are activated when the trigger switch
is depressed.
When the trigger is released, the worklight will stay illuminated
for up to 20 seconds.
20
9 that is provided. Be
can be attached
12
provided,
9
. To turn the
1
2 determines the direction of
and
1
on the right side
2
1 and depress
2 on the left side of the
located around the 6.35 mm hex
nOTE: The worklights are for lighting the immediate work
surface and are not intended to be used as a flashlight.
Mode Selector (Fig. A, D)
Your tool is equipped with a mode selector
you to select one of three modes. Select the mode based on the
application and control the speed of the tool using the variable
speed trigger switch
Precision Drive (Fig. D)
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In addition to normal impacting modes, this tool features the
Precision Drive mode which enables greater control in lighter
applications to avoid damage to materials or fasteners. It is ideal
for light applications such as cabinet hinge screws or machine
screws. Precision Drive mode will work as a screwdriver in light
applications, before hesitating as the screw head reaches the
work piece, and then (if required) start a slow controlled impact
to ensure the head ends perfectly flush.
nOTE: This mode is for light duty screwdriving applications. If
the tool will not drive a fastener in Precision Mode, please select
mode 2 which will give the additional power required.
Mode 1
Mode 2
Mode 3 High Speed Impacting
Quick-Release Chuck (Fig. A, E, F)

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 only.
Place the forward/reverse button
position or remove battery pack before changing accessories.
To install an accessory, fully insert the accessory. The accessory is
locked into place (Fig. E).
To remove an accessory, pull the chuck collar
front of the tool. Remove the accessory (Fig. F).
Usage
Your impact tool generates the following maximum torque:
cat #
DCF850

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 into the chuck. Keep the tool pointed
straight at the work piece.
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.
- socket size: Failure to use the correct socket 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.
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1 .
DCF850
Precision Drive rpm
Normal Impacting rpm
rpm
2 in the lock-off (centre)
3
nm
206.2
which allows
0–1000
0–2800
0–3250
away from the