Craftsman 315.270850 Operator's Manual page 12

NOTE: You might hear a whistling or ringing noise from
the switch during use. Do not be concerned; this is a
normal part of the switch function.
FORWARD / REVERSE / CENTER LOCK
See Figure 5.
The direction of bit rotation is reversible and is controlled
by a selector located above the switch trigger. With the
drill held in normal operating position, the direction of
rotation selector should be positioned to the left of the
switch trigger for drilling. The drilling direction is reversed
when the selector is to the right of the switch trigger.
Setting the switch trigger in the OFF (center lock) position
helps reduce the possibility of accidental starting when not
in use.
CAUTION:
To prevent gear damage, always allow
the chuck to come to a complete stop before chang-
ing the direction of rotation.
To stop the drill, release the switch trigger and allow the
chuck to come to a complete stop.
NOTE: The drill will not run unless the direction of rotation
selector is pushed fully to the left or right.
Avoid running the drill at low speeds for extended periods
of time. Running at low speeds under constant usage may
cause the drill to become overheated. If this occurs, cool
the drill by running it without a load and at full speed.
KEYLESS CHUCK
See Figure 6.
The drill has a keyless chuck to tighten or release drill bits
in the chuck jaws. Rotate the chuck body in the direction
indicated by the arrows on the chuck in order to LOCK
(tighten) or UNLOCK (release) the drill bit.
CHUCK JAWS
DRILL BIT
LOCK
(TIGHTEN)
UNLOCK
(RELEASE)
CHUCK BODY
OPERATION
WARNING:
hand and use the power of the drill to tighten the
chuck jaws on the drill bit. The chuck body could slip
in your hand, or your hand could slip and come in
contact with the rotating drill bit. This could cause an
accident resulting in serious personal injury.
TWO-SPEED GEAR TRAIN
See Figure 7.
The drill has a two-speed gear train designed for drilling or
driving at LO (1) or HI (2) speeds. A slide switch is located
on top of the drill to select either LO (1) or HI (2) speed.
When using drill in the LO (1) speed range, speed will
decrease and unit will have more power and torque. When
using drill in the HI (2) speed range, speed will increase
and unit will have less power and torque. Use LO (1)
speed for high power and torque applications and HI (2)
speed for fast drilling or driving applications.
SPEED
ADJUSTABLE TORQUE CLUTCH
This product is equipped with an adjustable torque
clutch for driving different types of screws into different
materials. The proper setting depends on the type of ma-
terial and the size of screw you are using.
Fig. 6
12
Do not hold the chuck body with one
TWO-SPEED
GEAR TRAIN (HI-LO)
1
2
HI
LO
SPEED
Fig. 7