Ryobi D552HK English Manual - Page 15

MAINTENANCE Chuck Removal See Figures 11 - 13. The chuck may be removed and replaced with a new one.  Unplug the drill.  Open chuck jaws using the provided chuck key.  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 chuck jaws and remove hex key. Remove the chuck screw by turning it in a clockwise direction. NOTE: The screw has left hand threads.  Insert hex key in the chuck and tighten chuck jaws securely.  Tap sharply with a mallet in a counterclockwise direction. This will loosen 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:  Unplug the drill.  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 by turning it in a counterclockwise direction. NOTE: The chuck screw has left hand threads. CHUCK JAWS HEX KEY SCREWDRIVER MALLET CHUCK mallet Fig. 11 Fig. 12 hex key 15 Fig. 13