Craftsman 315.11910 - Manual (Page 15)

MAINTENANCE
CHUCK REMOVAL
See Figures 13 - 15.
The chuck may be removed and replaced by a new one.
■ Lock the switch trigger by placing the direction of rota­
tion selector in center position,
■ Insert a 5/16 in, or larger hex key into the chuck of the
drill and tighten the chuck jaws securely.
■ Tap the hex key sharply with a mallet in a clockwise
direction. This will loosen the screw in the chuck for
easy removal.
■ Open the chuck jaws and remove the hex key.
■ Using a screwdriver, remove the chuck screw by turn­
ing it in a clockwise direction,
NOTE: The chuck screw has left hand threads.
■ Insert the hex key into the chuck and tighten the chuck
jaws securely. Tap sharply with a mallet in a counter­
clockwise direction. This will loosen the chuck on the
spindle. It can now be unscrewed by hand.
TO RETIGHTEN A LOOSE CHUCK
The chuck may become loose on the spindle and develop a
wobble. Also, the chuck screw may become loose, causing
the chuck jaws to bind and prevent them from closing.
To tighten:
■ Lock the switch trigger by placing the direction of rota­
tion selector in the center position,
■ Open the chuck jaws.
■ Insert the hex key into the chuck and tighten the chuck
jaws securely. Tap the hex key sharply with a mallet in
a clockwise direction. This will tighten the chuck on the
spindle.
■ Open the chuck jaws and remove the hex key.
■ Using a screwdriver, tighten the chuck screw by turn­
ing in a counterclockwise direction.
CHUCK JAWS
Fig. 14
HEX KEY
Fig. 15
15