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buildup of metallic particles should be kept away from charger cavities. Always unplug the
charger from the power supply when there is no battery pack in the cavity. Unplug charger
before attempting to clean.
• DO NOT attempt to charge the battery pack with any chargers other than the ones in
this manual. The charger and batter y pack are specifically designed to work together.
• These chargers are not intended for any uses other than charging D
batteries. Any other uses may result in risk of fire, electric shock or electrocution.
• Do not expose charger to rain or snow.
• Pull by plug rather than cord when disconnecting charger. This will reduce risk of
damage to electric plug and cord.
• Make sure that cord is located so that it will not be stepped on, tripped over, or
otherwise subjected to damage or stress.
• Do not use an extension cord unless it is absolutely necessary. Use of improper
extension cord could result in risk of fire, electric shock, or electrocution.
• When operating a power tool outdoors, use an extension cord suitable for outdoor
use. Use of a cord suitable for outdoor use reduces the risk of electric shock.
• An extension cord must have adequate wire size (AWG or American Wire Gauge) for
safety. The smaller the gauge number of the wire, the greater the capacity of the cable, that
is 16 gauge has more capacity than 18 gauge. An undersized cord will cause a drop in line
voltage resulting in loss of power and overheating. When using more than one extension to
make up the total length, be sure each individual extension contains at least the minimum
wire size. The following table shows the correct size to use depending on cord length and
nameplate ampere rating. If in doubt, use the next heavier gauge. The smaller the gauge
number, the heavier the cord.
Recommended Minimum Wire Size for Extension Cords
Total Length of Cord
25 ft.
50 ft.
75 ft.
7.6 m
15.2 m
22.9 m
Wire Size AWG
18
18
16
• Do not place any object on top of charger or place the charger on a soft surface that
might block the ventilation slots and result in excessive internal heat. Place the charger
in a position away from any heat source. The charger is ventilated through slots in the top and
the bottom of the housing.
• Do not operate charger with damaged cord or plug.
• Do not operate charger if it has received a sharp blow, been dropped, or otherwise
damaged in any way. Take it to an authorized service center.
• Do not disassemble charger; take it to an authorized service center when service or
repair is required. Incorrect reassembly may result in a risk of electric shock, electrocution or
fire.
• Disconnect the charger from the outlet before attempting any cleaning. This will
reduce the risk of electric shock. Removing the battery pack will not reduce this risk.
• NEVER attempt to connect 2 chargers together.
• The charger is designed to operate on standard 120V household electrical power. Do
not attempt to use it on any other voltage. This does not apply to the vehicular charger.
Using Automatic Tune-Up™ Mode
The automatic Tune-Up™ Mode equalizes or balances the individual cells in the battery pack
allowing it to function at peak capacity. Battery packs should be tuned up weekly or after
10 charge/discharge cycles or whenever the pack no longer delivers the same amount of work.
To use the automatic Tune-Up™, place the battery pack in the charger and leave it for at least 8
hours. The charger will cycle through the following modes.
1. The red light will blink continuously indicating that the 1-hour charge cycle has started.
2. When the 1-hour charge cycle is complete, the light will stay on continuously and will no
longer blink. This indicates that the pack is fully charged and can be used at this time.
3. If the pack is left in the charger after the initial 1-hour charge, the charger will begin the
Automatic Tune-Up™ mode. This mode continues up to 8 hours or until the individual cells
in the battery pack are equalized. The battery pack is ready for use and can be removed at
any time during the Automatic Tune-Up™ mode.
4. Once the Automatic Tune-Up™ mode is complete, the charger will begin a maintenance
charge; the red indicator will remain lit.
Chargers
Your tool uses a D
WALT 7.2, 9.6, 12, 14,4 or 18 volt charger. Be sure to read all safety
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instructions before using your charger. Consult the chart at the end of this manual for compatibility
of chargers and battery packs.
Charging Procedure
DANGER: Electrocution hazard. 120 volts present at charging terminals. Do not probe with
conductive objects. Danger of electric shock or electrocution.
1. Plug the charger into an appropriate outlet before inserting battery pack.
2. Insert the battery pack into the charger. The red (charging) light will blink continuously
indicating that the charging process has started.
3. The completion of charge will be indicated by the red light remaining ON continuously. The
pack is fully charged and may be used at this time or left in the charger.
Indicator Light Operation
Charge Indicators
Some chargers are designed to detect certain problems that can arise with battery packs.
Problems are indicated by the red light flashing at a fast rate. If this occurs, re-insert battery pack
into the charger. If the problem persists, try a different battery pack to determine if the charger is
OK. If the new pack charges correctly, then the original pack is defective and should be returned
to a service center or other collection site for recycling. If the new battery pack elicits the same
trouble indication as the original, have the charger tested at an authorized service center.
HOT/COLD PACK DELAY
Some chargers have a Hot/Cold Pack Delay feature: when the charger detects a battery that is
hot, it automatically starts a Hot Pack Delay, suspending charging until the battery has cooled.
After the battery has cooled, the charger automatically switches to the Pack Charging mode.
This feature ensures maximum battery life. The red light flashes long, then short while in the Hot
Pack Delay mode.
PROBLEM POWER LINE
Some chargers have a Problem Power Line indicator. When the charger is used with some
portable power sources such as generators or sources that convert DC to AC, the charger may
temporarily suspend operation, flashing the red light with two fast blinks followed by a
pause. This indicates the power source is out of limits.
LEAVING THE BATTERY PACK IN THE CHARGER
The charger and battery pack can be left connected with the red light glowing indefinitely. The
charger will keep the battery pack fresh and fully charged.
NOTE: A battery pack will slowly lose its charge when kept out of the charger. If the battery pack
has not been kept on maintenance charge, it may need to be recharged before use. A battery
pack may also slowly lose its charge if left in a charger that is not plugged into an appropriate
AC source.
WEAK BATTERY PACKS: Chargers can also detect a weak battery pack. Such batteries are
still usable but should not be expected to perform as much work. The charger will indicate to
replace battery pack.
Important Charging Notes
1. Longest life and best performance can be obtained if the battery pack is charged when the
air temperature is between 65°F and 75°F (18°- 24°C). DO NOT charge the battery pack in
an air temperature below +40°F (+4.5°C), or above +105°F (+40.5°C). This is important and
will prevent serious damage to the battery pack.
2. The charger and battery pack may become warm to touch while charging. This is a normal
condition, and does not indicate a problem. To facilitate the cooling of the battery pack after
use, avoid placing the charger or battery pack in a warm environment such as in a metal
shed, or an uninsulated trailer.
3. If the battery pack does not charge properly:
a. Check current at receptacle by plugging in a lamp or other appliance;
b. Check to see if receptacle is connected to a light switch which turns power off when you
turn out the lights;
c. Move charger and battery pack to a location where the surrounding air temperature is
approximately 65°F - 75°F (18°- 24°C);
d. If charging problems persist, take the tool, battery pack and charger to your local service
center.
4. The battery pack should be recharged when it fails to produce sufficient power on jobs which
were easily done previously. DO NOT CONTINUE to use under these conditions. Follow the
charging procedure. You may also charge a partially used pack whenever you desire with no
adverse affect on the battery pack.
5. Under certain conditions, with the charger plugged into the power supply, the exposed
charging contacts inside the charger can be shorted by foreign material. Foreign materials
of a conductive nature such as, but not limited to, grinding dust, metal chips, steel wool,
aluminum foil, or any buildup of metallic particles should be kept away from charger cavities.
Always unplug the charger from the power supply when there is no battery pack in the cavity.
Unplug charger before attempting to clean.
6. Do not freeze or immerse charger in water or any other liquid.
WARNING: Shock hazard. Don't allow any liquid to get inside charger. Electric shock may
result.
CAUTION: Never attempt to open the battery pack for any reason. If the plastic housing of
the battery pack breaks or cracks, return to a service center for recycling.
Storage Recommendations
1. The best storage place is one that is cool and dry away from direct sunlight and excess heat
or cold.
2. Long storage will not harm the battery pack or charger. Under proper conditions, they can
be stored for 5 years or more.
SAVE THESE INSTRUCTIONS FOR FUTURE USE
Motor
Voltage decrease of more than 10% will cause loss of power and overheating. All D
are factory tested; if this tool does not operate, check your battery pack.
WALT rechargeable
E
100 ft.
125 ft.
150 ft.
30.5 m
38.1 m
45.7 m
16
14
14
FIG. 1
FIG. 3
D
E
I
A
175 ft.
53.3 m
12
FIG. 4
E
COMPONENTS (Fig. 3)
WARNING: Never modify the power tool or any part of it. Damage or personal injury could
result.
A. Trigger switch
B. Rocker switch (DW059)
C. Forward/reverse button
D. Sleeve
E. 1/4" hex quick-release chuck
INTENDED USE
These heavy-duty impact wrench/drivers are designed for professional impact screwdriving
applications. The impact function makes this tool particularly useful for driving fasteners in wood,
metal and concrete. DO NOT use under wet conditions or in presence of flammable liquids or
gases.
These heavy-duty impact wrench/drivers are professional power tools. DO NOT let children
come into contact with the tool. Supervision is required when inexperienced operators use this
tool.
Belt Hook (Optional Accessory)
WARNING: To reduce the risk of serious personal injury, DO NOT suspend tool overhead
or suspend objects from the belt hook. ONLY hang tool's belt hook from a work belt.
WARNING: To reduce the risk of serious personal injury, ensure the screw (K) holding the
belt hook is secure.
The belt hook (J) can be be attached to either side of the tool 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 (K) that holds the belt hook in place then reassemble on
the opposite side.
OPERATION
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.
Installing and Removing the Battery Pack
NOTE: Make sure your battery pack is fully charged.
To install the battery pack into the tool handle, align the base of the tool with the notch inside
the tool's handle (Fig. 2) and slide the battery pack firmly into the handle until you hear the lock
snap into place.
To remove the battery pack from the tool, press the release buttons (H) and firmly pull the
battery pack out of the tool handle. Insert it into the charger as described in the charger section
of this manual.
Switch – DW059 (Fig. 3)
Pressing the BOTTOM part of the rocker switch (B) runs the tool in forward (right hand thread)
direction. Pressing the TOP of the switch reverses motor direction. This allows "rocking"
fasteners to break them loose.
Variable Speed Trigger Switch (Fig. 3)
To turn the tool on, squeeze the trigger switch (A). To turn the tool off, release the trigger
switch. Your tool is equipped with a brake. The chuck will stop as soon as the trigger switch is
fully released. The variable speed switch enables you to select the best speed for a particular
application. The more you squeeze the trigger, the faster the tool will operate. Use lower speeds
for starting holes without a center punch, drilling in metals or plastics, or driving screws. 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. 3)
A forward/reverse control button (C) determines the direction of the tool and also serves as a lock
off button. 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 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: 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.
Worklight (Fig. 3)
There is a worklight (I) located just above the trigger switch (A). The worklight will be activated
when the trigger switch is squeezed.
NOTE: The worklight is for lighting the immediate work surface and is not intended to be used
as a flashlight.
Quick-Release Chuck (Fig. 4)
DC825, DC827, DC835, DC845, DC855
NOTE: The chuck accepts 1/4" (6.35 mm) hex accessories only.
Place the switch in the locked off (center) position or remove battery pack before changing
accessories.
To install an accessory, pull the chuck collar (D) away from the front of the tool, insert the
accessory and release the collar. The accessory is locked in place.
To remove an accessory, pull the chuck collar away from the front of the tool. Remove the
accessory and release the collar.
Anvil With Detent Pin (Fig. 5)
DC820, DC821, DC822, DC823, DC830, DC840, DW059
Place the switch in the locked off (center) position or remove battery pack before changing
accessories.
To install a socket on the anvil, align the hole in the side of the socket with the detent pin (F) on
the anvil (G). Press the socket on until the detent pin engages in the hole. Depression of detent
pin may be necessary to aid installation of socket.
CAUTION: Use only impact sockets. Non-impact sockets may break and cause a hazardous
condition. Inspect sock et prior to use to ensure that it con tains no cracks.
To remove a socket, depress the detent pin through the hole and pull the socket off.
Usage
Your impact tool generates the following output torque:
Cat #
Ft.-Lbs. In.-Lbs.
DC820
DC821
DC822
DC823
DC825
DC827
DC830
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 socket on the fastener head. Keep the tool pointed straight at the fastener.
2. Press switch to start 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
WALT tools
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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.
C
J
K
H
D
F. Detent pin
G. Anvil
H. Battery release buttons
I. Worklight
J. Belt hook (optional accessory)
Nm
Cat #
145
1740
195
DC835
160
1920
215
DC840
145
1740
195
DC841
120
1440
160
DC845
111
1330
150
DC855
111
1330
150
DW059
135
1620
180
FIG. 2
H
B
DW059
FIG. 5
G
F
Ft.-Lbs. In.-Lbs.
Nm
103
1240
140
120
1440
160
105
1260
145
96
1150
130
80
960
110
300
3600
405
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