Maintenance - DeWalt DW194 Instruction Manual

384957/Drill 5/2/02 1:05 PM
5. Hold tool firmly to control the twisting action of the drill.
6. IF DRILL STALLS, it is usually because it is being overloaded or
improperly used. 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.
7. To minimize stalling or breaking through the material, reduce
pressure on drill and ease the bit through the last fractional part of
the hole.
8. Keep the motor running when pulling the bit back out of a drilled
hole. This will help prevent jamming.
Changing Speeds
These units are designed to operate with two speeds. The changing
of speeds is accomplished by using the Speed Shift Lever built into
the Gear Case of the unit. To obtain the desired speed, low or high,
follow the steps listed below:
LOW R.P.M.
1. Loosen the shift lever locking knob (1/4 turn counterclockwise).
2. Move shift lever toward motor until clutch teeth are fully engaged.
3. Retighten locking knob.
HIGH R.P.M.
1. Follow the above procedure with the exception that the Shift Lever
should be moved toward the spindle.
NOTE: Use wrench or pliers to tighten locking nut if it vibrates loose.
In normal operation, hand tightening will be sufficient.
*Shifting may accomplished more easily when the drill is running.
When not running, it may be necessary to turn the spindle by hand
to allow the clutch teeth to engage.
NOTE: Assemble locking knob, cup washer and flat washer to the
unit in the following sequence.
1. Flat washer
2. Cup washer ("Cup" of the washer toward the unit)
3. Locking knob - Place through washers and screw into shift lever.
Page 2
2
Motor
Be sure that your power supply agrees with the voltage marked on
the nameplate of your power unit. 120 volts AC/DC means that the
tool may be operated with alternating current or direct current with a
voltage of 120 volts. 220/240 volts AC/DC means that the tool may
be operated with alternating or direct current within a voltage range
of 220 to 240 volts. A voltage decrease of more that 10% will cause
a loss of power, overheating, and potential tool damage. The tool
have been factory tested: if the tool does not operate check your
power supply.
Motor Brushes
Carbon brushes should be regularly inspected for wear.
Keep brushes clean and sliding freely in their guides. Carbon
brushes have varying symbols stamped into them, and if the brush
is worn down to the line closest to the spring, they must be replaced.
New brush assemblies are available at authorized service centers;
see TOOLS, ELECTRIC in the yellow pages.
If your drill does not have exterior inspection caps, brush inspection
should only be attempted by authorized service personnel. The
inspection should be made every two to six months, depending upon
usage.

Maintenance

Use only mild soap and damp cloth to clean the tool. Never let any
liquid get inside the tool; never immerse any part of the tool into a
liquid.
Bearings
DeWalt tools use both "closed" and "open" bearings.
CLOSED TYPE BEARINGS
The closed bearing is permanently lubricated at the factory to last the
life of the tool. Lubricant is retained in the bearing by two shields
(no-contacting metal plates), two seals (contacting felt or synthetic
rubber), or a combination of one shield and one seal.