Charging; Indicator Light Operation; Charge Indicators; Using Automatic Tune-Up Mode - DeWalt DW937 Instruction Manual

FIG. 1
B
A
G
F
• 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.
Minimum Gauge for Cord Sets
Volts
Ampere Rating 120V
240V
More Not More
Than
Than
0 6
6 10
10 12
12 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 two chargers together.
• The charger is designed to operate on standard 120 volt 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 charger. Be sure to read all safety instructions before using your
E
charger. Consult the chart at the end of this manual for compatibility of chargers and battery
packs.
Charging Procedure (Fig. 2)
DANGER: Electrocution hazard. 120 volts are present at charging terminals. Do not probe
with conductive objects. Electric shock or electrocution may result.
1. Plug the charger into an appropriate outlet before inserting battery pack.
2. Insert the battery pack (G) into the charger, as shown in Figure 2, making sure the pack
is fully seated in 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 operation of 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.
WARNING: Burn hazard. 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. For long storage, it is recommended to store a fully charged battery pack in a cool dry place
out of the charger for optimal results.
NOTE: Battery packs should not be stored completely depleted of charge. The battery pack will
need to be recharged before use.
E
C
Total Length of Cord in Feet (meters)
25 (7.6) 50 (15.2) 100 (30.5)
50 (15.2) 100 (30.5) 200 (61.0)
AWG
18 16 16
18 16 14
16 16 14
14 12 Not Recommended
FIG. 2
G
D
FIG. 4
FIG. 6
150 (45.7)
300 (91.4)
14 C
12
12
FIG. 9
FIG. 11
ROCK TOOL UP TO NORMAL CUTTING
POSITION AFTER BLADE HAS CUT
THROUGH MATERIAL
PIVOTER L'OUTIL EN POSITION
NORMALE DE COUPE UNE FOIS QUE
LA LAME A TRAVERSÉ
LE MATÉRIAU.
BALANCEE LA HERRAMIENTA HACIA
ARRIBA HASTA ALCANZAR LA
POSICIÓN NORMAL DE CORTE LUEGO
DE QUE LA HOJA
ATRAVIESE EL MATERIAL
STARTING POSITION FOR POCKET CUTTING
POSITION DE DÉPART POUR COUPE INTERNE
POSICIÓN INICIAL PARA CORTES CENTRALES
SAVE THESE INSTRUCTIONS FOR FUTURE USE
COMPONENTS (Fig. 1)
WARNING: Never modify the power tool or any part of it. Damage or personal injury could
result.
A. Trigger switch
B. Lock-off button
C. Blade clamp release lever
D. Shoe
Switch (Variable Speed) (Fig. 3)
WARNING: This tool has no provision to lock the switch in the ON position, and should never
be locked ON by any other means.
CAUTION: Use of very slow speed is recommended only for beginning a cut. Prolonged use
at very slow speed may damage your saw.
LOCK-OFF BUTTON AND TRIGGER SWITCH
Your saw is equipped with a lock-off button (B).
To lock the trigger switch, press the lock-off button as shown in Figure 3. Always lock the
trigger switch (A) when carrying or storing the tool to eliminate unintentional starting. The lock-off
button is colored red to indicate when the switch is in its unlocked position.
To unlock the trigger switch, press the lock-off button as shown in Figure 3. Pull the trigger
switch to turn the motor ON. Releasing the trigger switch turns the motor OFF.
The variable speed trigger switch will give you added versatility. The further the trigger is
depressed the higher the speed of the saw.
OPERATION
WARNING: To reduce the risk of serious personal injury, depress the trigger lock
button and disconnect battery pack before making any adjustments or removing/
installing attachments or accessories. An accidental start-up can cause injury.
Installing and Removing the Battery Pack (Fig. 1, 4)
NOTE: For best results, make sure your battery pack is fully charged.
To install the battery pack into the tool handle, align the notch inside the tool's handle with the
battery pack and slide the battery pack firmly into the handle until you hear the lock snap into
place as shown in Figure 4.
To remove the battery pack from the tool, press the release buttons (F) 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.
Blade Installation and Removal (Fig. 5, 6, 10)
WARNING: Cut hazard. Blade breakage may occur if the blade does not extend past the
shoe and the workpiece during the cut (Fig. 5). Increased risk of personal injury, as well as
damage to the shoe and workpiece may result.
Different blade lengths are available. Use the appropriate blade for the application. The blade
should be longer than 3-1/2" (88.9 mm) and should extend past the shoe and the thickness of
the workpiece during the cut. Do not use jigsaw blades with this tool.
TO INSTALL BLADE INTO SAW
1. Open blade clamp release lever (C) up (Fig. 6).
2. Insert blade shank from the front.
3. Close blade clamp release lever down.
4. Note blade can be installed upside-down to assist in flush-to cutting, see Figure 10.
TO REMOVE BLADE FROM SAW
CAUTION: Burn hazard. Do not touch the the blade immediately after use. Contact with the
blade may result in personal injury.
1. Open up blade clamp release lever.
2. Remove blade.
Cutting with Blade in Horizontal Position (Fig. 7)
Your saw may or may not be equipped with a horizontal blade clamp. Installing a blade in the
horizontal orientation allows cutting close to floors, walls or ceilings where limited clearance is
available. Ensure that the shoe is pressed against the framing to avoid kickback.
Adjustable Shoe (Fig. 1, 8)
CAUTION: Cut hazard. To prevent loss of control, never use tool without shoe.
Your saw may or may not come with an adjustable shoe (D). The shoe will adjust to limit the
depth of cut. Hold the saw with the underside facing up. Push the button on the hand grip and
slide the shoe out to one of the three settings and release the button.
Cutting (Fig. 9)
WARNING: Always use eye protection. All users and bystanders must wear eye protection
that conforms to ANSI Z87.1.
WARNING: Exercise extra caution when cutting towards operator. Always hold saw firmly
with both hands while cutting.
WARNING: Use extra caution when cutting overhead and pay particular attention to
overhead wires which may be hidden from view. Anticipate the path of falling branches and
debris ahead of time.
WARNING: Inspect work site for hidden gas pipes, water pipes, or electrical wires before
making blind or plunge cuts. Failure to do so may result in explosion, property damage, electric
shock, and/or serious personal injury.
Before cutting any type of material, be sure it is firmly anchored or clamped to prevent slipping.
Place blade lightly against work to be cut, switch on saw motor and allow it to obtain maximum
speed before applying pressure. Whenever possible, the saw shoe must be held firmly against
the material being cut. This will prevent the saw from jumping or vibrating and minimize blade
breakage. Any cut which puts pressure on the blade such as angle or scroll cuts increase
potential for vibration, kickback, and blade breakage.
FIG. 3
B
LOCKED
VERROUILLÉ
BLOQUEADO
FIG. 5
FIG. 7
FIG. 10
FIG. 12
E. Hand grip
F. Battery release button
G. Battery pack
UNLOCKED
DÉVERROUILLÉ
DESBLOQUEADO
A
FIG. 8