DeWALT dc550ka cordless rotary tools ユーザーガイド

CAUTION: Under certain conditions, with the charger plugged in to the power supply, 

Total Length of Cord
  

25 ft. 

50 ft. 

75 ft. 

100 ft. 

125 ft. 

150 ft. 

175 ft.

   7.6 m 

15.2 m 

22.9 m 

30.5 m 

38.1 m 

45.7 m 

53.3 m

Wire Size AWG
  

18  

18  

16 

16  

14  

14 

12

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.

Your tool uses a D

E

WALT 14.4 or 18 volt charger. Be sure to read all safety instructions 

before using your charger. Consult the chart at the end of this manual for compatibility of 
chargers and battery packs.

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.

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.

 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.

 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.

NOTE: Make sure your battery pack is fully charged. 

battery.
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 (Fig. 2).
To remove the battery pack from the tool, press the release buttons (A) and firmly 
pull the battery pack out of the tool handle. Insert it into the charger as described in the 
charger manual.

To start the motor, slide the switch (B) to “I” position. To stop the motor, slide the switch 
to “O” position.

Depth guide (C) snaps onto locators as shown. Keep depth guide in place at all times 
during operation of the tool. For best results, adjust the guide using knob (D) to allow the 
bit to protrude about 1/8" past the material to be cut.

This tool has a tool-free bit change system. To change bits, FIRST turn off the tool and 
disconnect the battery from the tool. Remove the depth guide (C). 
 1.  To replace bit, depress both spindle lock (E) and collet lock (F) and turn collet grip 

counterclockwise.

 2.  Insert or remove bit.

in broken bits.
 3.  While depressing both spindle and collet locks, turn the collet grip clockwise to firmly 

tighten the collet. For some heavy duty applications, it may be necessary to use a 
wrench to further tighten the nut (G) while depressing the spindle lock (E).

 4.  Attach guide.

This tool comes with both 1/8" (3 mm) and 1/4" (6 mm) collets. To change collets, remove 
the collet nut and insert the desired collet.

 1.  Push any wiring deeply into the outlet box to avoid damage from the cutting bit.
 2.  Before hanging the sheet covering the outlet, mark the approximate location of the 

center of the outlet on the wall board. Check the cutting bit depth against the side of 
the board to be sure it will cut entirely through the material.

 3.  Tack the sheet in place with a few fasteners avoiding the stud holding the outlet. This 

allows the wall board to flex slightly around the protruding fixture box.

 4.  Turn the cut-out tool on. Holding the tool firmly with both hands, plunge the bit straight 

into the center of the outlet.

 5.  Cut to the right until the edge of the box is touched. Pull out just enough for the bit to 

clear the edge of the box. Plunge in again holding the bit gently against the outside of 
the box.

 6.  Follow the outside of the box as shown keeping slight pressure against the box. This 

will minimize wandering and give you a clean precise cut.

 7.  Remove the waste and dust from the outlet. Finish fastening the sheet of wall board.

this product. 
Recommended accessories for use with your tool are available at extra cost from your local 
service center. If you need any assistance in locating any accessory, please contact D

E

WALT 

Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286, call 1-800-4-D

E

WALT 

(1-800-433-9258) or visit our website www.dewalt.com.

The charger is not serviceable. There are no serviceable parts inside the charger. 
To assure product SAFETY and RELIABILITY, repairs, maintenance and adjustments 
(including brush inspection and replacement) should be performed by a D

E

WALT factory 

service center, a D

E

WALT authorized service center or other qualified service personnel. 

Always use identical replacement parts.

D

E

WALT will repair, without charge, any defects due to faulty materials or workmanship 

for three years from the date of purchase. This warranty does not cover part failure due 
to normal wear or tool abuse. For further detail of warranty coverage and warranty repair 
information, visit www.dewalt.com or call 1-800-4-D

E

WALT (1-800-433-9258). This 

warranty does not apply to accessories or damage caused where repairs have been made 
or attempted by others. This warranty gives you specific legal rights and you may have 
other rights which vary in certain states or provinces.

In addition to the warranty, D

E

WALT tools are covered by our:

D

E

WALT will maintain the tool and replace worn parts caused by normal use, for free, any 

time during the first year after purchase. 

FIG. 1

FIG. 6

FIG. 4

E

C

D

F

G

FIG. 5

C

FIG. 2

A

FIG. 3

B