OPERATION
CHUCK REMOVAL
See Figures 11, 12, and 13.
Whenever necessary to remove the chuck for replacement, use the following procedure for chuck removal:
■UNPLUG YOUR HAMMER DRILL.
WARNING:
Failure to unplug your hammer drill could result in accidental starting causing serious injury.
■Open chuck jaws. Insert a 5/16 in. (8 mm) or larger hex key into the chuck of your drill and tighten the chuck jaws securely.
■Tap the hex key sharply with a mallet in a clockwise direction. See Figure 11. This will loosen the chuck screw for removal.
■Open the chuck jaws and remove hex key. Remove the chuck screw by turning it in a clockwise direction. See Figure 12.
NOTE: The chuck screw has left hand threads.
■Insert hex key in chuck and tighten chuck jaws securely. Tap sharply with a mallet in a counterclockwise direction. This will loosen the chuck on the spindle. It can now be unscrewed by hand. See Figure 13.
TO RETIGHTEN A LOOSE CHUCK
The chuck may at times 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, follow these steps:
■UNPLUG YOUR HAMMER DRILL.
WARNING:
Failure to unplug your hammer drill could result in accidental starting causing serious injury.
■Insert hex key into chuck and tighten chuck jaws securely. Tap hex key sharply with a mallet in a clockwise direction. This will tighten the chuck on the spindle. See Figure 11.
■Open the chuck jaws and remove hex key.
■Tighten the chuck screw.
NOTE: The chuck screw has left hand threads. See Figure 12.
MALLET
CHUCK
CHUCK
JAWS 
HEX KEY
Fig. 11
SCREWDRIVER
Fig. 12
MALLET
CHUCK
HEX KEY
CHUCK REMOVAL | Fig. 13 |
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