RIDGID R840011 Operator's Manual page 18

MAINTENANCE
CHUCK REMOVAL
See Figures 14 - 16.
The chuck may be removed and replaced by a new one.
 Lock the switch trigger by placing the direction of rotation
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 di-
rection. 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 turning 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 counterclock-
wise 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, caus-
ing the chuck jaws to bind and prevent them from closing.
To tighten:
 Lock the switch trigger by placing the direction of rotation
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.
 Tighten the chuck screw.
CHUCK JAWS
HEX KEY
SCREWDRIVER
HEX KEY
18
MALLET
KEYLESS
CHUCK
Fig. 14
Fig. 15
MALLET
Fig. 16