Dewalt 18 В XR DCF850N-XJ - Инструкция по эксплуатации - Страница 13

11

English

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 

 located around the 6.35 mm hex 

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.

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 

 11 

 which allows 

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 

 1 

.

Precision Drive (Fig. D)

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.

DCF850

Mode 1

Precision Drive

rpm

0–1000

Mode 2

Normal Impacting

rpm

0–2800

Mode 3

High Speed Impacting

rpm

0–3250

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 

 2 

 in the lock-off (centre) 

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 

 3 

 away from the 

front of the tool. Remove the accessory (Fig. F).

Usage

Your impact tool generates the following maximum torque:

Cat #

nm

DCF850

206.2

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.

-

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

Your 

D

e

WALT

 power tool has been designed to operate 

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.