Maintenance - DeWalt DCD990 Original Instructions Manual

EN GLI SH
Drill Operation (fi g. 4)
WARNING: To reduce the risk
of serious personal injury, turn
tool off and disconnect tool from
power source before making any
adjustments or removing/installing
attachments or accessories.
WARNING: To reduce the risk of
personal injury, ALWAYS ensure
workpiece is anchored or clamped
firmly. If drilling thin material, use a wood
"back-up" block to prevent damage to
the material.
1. Select the desired speed/torque range using
the gear shifter to match the speed and torque
to the planned operation. Set the torque
adjustment collar (e) to the drill symbol.
2. For WOOD, use twist bits, spade bits, power
auger bits or hole saws. For METAL, use high-
speed steel twist drill bits or hole saws. Use
a cutting lubricant when drilling metals. The
exceptions are cast iron and brass which should
be drilled dry.
3. Always apply pressure in a straight line with the
bit. Use enough pressure to keep the drill bit
biting, but do not push hard enough to stall the
motor or deflect the bit.
4. Hold tool firmly with both hands to control the
twisting action of the drill.
5. IF DRILL STALLS, it is usually because it
is being overloaded. RELEASE TRIGGER
IMMEDIATELY, remove drill bit from work,
and determine cause of stalling. DO NOT
CLICK TRIGGER OFF AND ON IN AN
ATTEMPT TO START A STALLED DRILL –
THIS CAN DAMAGE THE DRILL.
6. Keep the motor running when pulling the bit
back out of a drilled hole. This will help prevent
jamming.
Screwdriver Operation (fi g. 3)
1. Select the desired speed/torque range using
the three-speed gear shifter (f) on the top of the
tool. If using the torque adjustment collar (e),
initially set the three-speed gear shifter to speed
2 or 3. This ensures control over the fastener
and allows the screw to be set to specification.
NOTE: Use the lowest torque setting (1) first
and increase the number through to the highest
setting (11) to seat the fastener at the desired
depth. The lower the number, the lower the
torque output.
12
2. Reset the torque adjustment collar (e) to the
appropriate number setting for the torque
desired. Make a few practice runs in scrap or
unseen areas to determine the proper position
of the torque adjustment collar.
NOTE: The torque adjustment collar may be set to
any number at any time.
Hammerdrill Operation (fi g. 5)
1. Select the desired speed/torque range using
the gear shifter to match the speed and torque
to the planned operation. Set the torque
adjustment collar (e) to the hammer symbol.
2. Select the high speed 3 setting by sliding the
gear shifter (f) back (away form the chuck).
3. When drilling, use just enough force on the
hammer to keep it from bouncing excessively.
Prolonged and too much force on the hammer
will cause slower drilling speeds and potential
overheating.
4. Drill straight, keeping the bit at a right angle to
the work. Do not exert side pressure on the bit
when drilling as this will cause clogging of the
bit flutes and a slower drilling speed.
5. When drilling deep holes, if the hammer speed
starts to drop off, pull the bit partially out of
the hole with the tool still running to help clear
debris from the hole.
6. For masonry, use carbide-tipped bits or
masonry bits. A smooth, even flow of dust
indicates the proper drilling rate.

MAINTENANCE

Your D WALT power tool has been designed to
E
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.
There are no serviceable parts inside.
Lubrication
Your power tool requires no additional lubrication.