Ryobi D552HK English Manual - Page 11

operation WARNING: Always unplug the tool when installing or removing bits, adjusting settings, or when the tool is not in use. Failure to unplug the tool may result in accidental starting and serious personal injury. INSTALLING BITS See Figures 5 - 6.  Unplug the drill.  Insert the chuck key and twist counterclockwise.  Open or close the chuck jaws to a point where the opening is slightly larger than the bit size you intend to use. Also, raise the front of the drill slightly to keep the bit from falling out of the chuck jaws.  Insert the drill bit. WARNING: Make sure to insert the drill bit straight into the chuck jaws. Do not insert the drill bit into the chuck jaws at an angle then tighten, as shown in figure 6. This could cause the drill bit to be thrown from the drill, resulting in possible serious personal injury or damage to the chuck.  Tighten the chuck jaws securely on the drill bit, using the chuck key provided.  Remove the chuck key. REMOVING BITS See Figure 5.  Unplug the drill.  Loosen the chuck jaws using the chuck key provided.  Remove the drill bit.  Remove the chuck key. SELECTING hammer MODE or drilling mode See Figure 7. To adjust for type of drilling, slide the selector on top of the motor housing to hammer mode or drilling mode. The hammer mode symbol is on the right and the drill bit symbol is on the left. NOTE: The hammer drill has not been designed for reverse hammering. Use carbide-tipped bits or designated hammer drill bits and select hammer mode when drilling in hard materials such as brick, tile, concrete, etc. Select normal drill mode when drilling with twist drills, hole saws, etc., in soft materials. Chuck KEY STORAGE RIGHT TO TIGHTEN TO LOOSEN Chuck KEY Drill Bit Chuck JAWS WRONG DRILLING/HAMMER MODE SELECTOR hammer drill 11 Chuck Fig. 5 Fig. 6 Fig. 7