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Your new hammer drill has been engineered and manufactured to Ryobi's high standard for dependability, ease of
operation, and operator safety. Properly cared for, it will give you years of rugged, trouble-free performance.

WARNING: 

To reduce the risk of injury, the user must read and understand the operator’s manual.

Thank you again for buying a Ryobi hammer drill.

OPERATOR'S MANUAL

HAMMER DRILL - 1/2 in. (13 mm)

D550H

VARIABLE SPEED – DOUBLE INSULATED

SAVE THIS MANUAL FOR FUTURE REFERENCE

Summary of Contents for D550H

Page 1: ...Properly cared for it will give you years of rugged trouble free performance WARNING To reduce the risk of injury the user must read and understand the operator s manual Thank you again for buying a...

Page 2: ...ety glasses with side shields and a full face shield when needed We recommend Wide Vision Safety Mask for use over eyeglasses or standard safety glasses with side shields Always wear eye protection wh...

Page 3: ...othing or jewelry Contain long hair Keep your hair cloth ing and gloves away from moving parts Loose clothes jewelry or long hair can be caught in mov ing parts or drawn into air vents Avoid accidenta...

Page 4: ...lec tric shock or fire Make sure your extension cord is in good condi tion When using an extension cord be sure to use one heavy enough to carry the current your product will draw A wire gage size A W...

Page 5: ...eserve your careful attention and understanding The safety warnings do not by themselves eliminate any danger The instructions or warnings they give are not substitutes for proper accident prevention...

Page 6: ...or the purposes listed below Hammer drilling in concrete brick or other masonry Drilling in wood Drilling in ceramics plastics fiberglass and laminates Drilling in both soft and hard metals Using driv...

Page 7: ...verheat If your tool does not operate when plugged into an outlet double check the power supply SWITCH Your hammer drill has a conveniently located trigger switch LOCK ON The hammer drill contains a l...

Page 8: ...te accessories not recommended for use with this tool Any such alteration or modification is misuse and could result in a hazardous condition leading to possible serious personal injury HANDLE ASSEMBL...

Page 9: ...chuck collar clockwise Raise the front of the drill to keep the drill bit from falling out of the chuck jaws WARNING Do not insert a drill bit into the chuck jaws and tighten as shown in Figure 3 Thi...

Page 10: ...assembly by turning the handle counterclockwise Adjust the depth gauge rod so that the drill bit ex tends beyond the end of the rod to the required drilling depth Tighten the handle assembly by turnin...

Page 11: ...e gears engage CAUTION Never change gears while the tool is running Failure to obey this caution could result in serious damage to the drill CHANGING THE ROTATION See Figure 8 The direction of the chu...

Page 12: ...ock on button NOTE To release the lock depress the switch trigger DRILLING See Figure 11 Follow these directions to drill Depress and release the switch trigger to make sure the drill is in the OFF po...

Page 13: ...however you do work with any of these materials it is extremely important that the tool is cleaned frequently by blowing with an air jet MAINTENANCE WARNING Always wear safety goggles or safety glasse...

Page 14: ...key sharply with a mallet in a counterclockwise direction Unscrew the chuck by hand TIGHTENING THE CHUCK See Figures 12 and 13 The chuck may become loose on the spindle and begin to shake when using t...

Page 15: ...15 NOTES...

Page 16: ...RING REPAIR PARTS ALWAYS GIVE THE FOLLOWING INFORMATION MODEL NUMBER SERIAL NUMBER D550H EXTENSION CORD CAUTION When using a power tool at a considerable distance from a power source be sure to use an...

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