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Ryobi D551H - page 1
SA VE THIS MANUAL FOR FUTURE REFERENCE Y our hammer drill has been engineered and manufactur ed to Ryobi’ s high standard for dependability , ease of operation, and operator safety . When properly car ed for , it will give you years of rugged, trouble-free performance. WARNING: T o r educe the risk of injury , the user must read and understand th ...
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Ryobi D551H - page 2
2 3 n Introduction ..................................................................................................................................................................... 2 � n General Safety Rules ............................................................... ........................................................................ ...
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Ryobi D551H - page 3
2 3 GENERAL SAFETY RULES n Avoid accidental starting. Be sure switch is off before plugging in. Carrying tools with your finger on the swi tch o r plug ging in tool s tha t have the swi tch o n invites accidents. n Remove adjusting keys or wrenches before turning the tool on. A wrench or a key that is left attached to a rotating part of the tool ma ...
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Ryobi D551H - page 4
4 5 SERVICE n Tool service must be performed only by qualified repair personnel. Service or maintenance performed by unqualified personnel may result in a risk of injury. n When servicing a tool, use only id entical replacement parts. Follow instructions in the Maintenance section of this manual. Use of unauthorized parts or failure to fol low M ai ...
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Ryobi D551H - page 5
4 5 SYMBOLS Some of the following symbols may be used on this tool. Please study them and learn their meaning. Proper interpreta- tion of these symbols will allow you to operate the tool better and safer . Read The Operator’ s Manual Safety Alert No Hands Symbol No Hands Symbol No Hands Symbol No Hands Symbol SYMBOL NAME DESIGNA TION/EXPLANA TION ...
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Ryobi D551H - page 6
6 7 SYMBOLS SERVICE Servicing r equires extreme car e and knowledge and should be performed only by a qualified service technician. For service we suggest you return the product to your nearest AUTHORIZED SERVICE CENTER for r epair . When servic- ing, use only identical replacement parts. WARNING: SA VE THESE INSTRUCTIONS The following signal words ...
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Ryobi D551H - page 7
6 7 ELECTRICAL EXTENSION CORDS When using a power tool at a considerable distance from a power sour ce, be sur e to use an extension cor d that has the capacity to handle the current the tool will draw . An undersized cord will cause a dr op in line voltage, resulting in overheating and loss of power . Use the chart to determine the minimum wir e s ...
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Ryobi D551H - page 8
8 9 FEA TURES Fig. 1 PRODUCT SPECIFICA TIONS Chuck Capacity .............................................................................................................................................. 5/64 in. - 1/2 in. Hammer Speed ................................................................................................................... ...
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Ryobi D551H - page 9
8 9 FEA TURES KNOW YOUR HAMMER DRILL See Figure 1. Before attempting to use this product, familiarize yourself with all operating features and safety rules. AUXILIAR Y HANDLE ASSEMBL Y An auxiliary handle assembly is installed on the hammer drill. For ease of operation, you may use the handle with either your left hand or your right hand. CHUCK KEY ...
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Ryobi D551H - page 10
10 11 WARNING: If any parts are missing do not operate this tool until the missing parts are replaced. Failure to heed this warning could result in possible serious personal injury . WARNING: Do not attempt to modify this tool or create accesso- ries not recommended for use with this tool. Any such alteration or modification is misuse and could res ...
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Ryobi D551H - page 11
10 11 WARNING: Always unplug the drill befor e inserting or r emoving bits or adjus tin g the aux ilia ry handl e asse mbly or dept h gaug e rod. Failure to unplug the tool could result in accidental starting causing possible serious injury . INSERTING BITS See Figure 2. n Unplug the hammer drill. n Position the chuck jaws so that the opening is sl ...
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Ryobi D551H - page 12
12 13 OPERA TION ADJUSTING THE DEPTH GAUGE ROD See Figure 5. n Unplug the hammer drill. n Loosen the handle assembly by turning the handle coun - terclockwise. n Adjust the depth gauge rod so that the drill bit extends beyond the end of the rod to the required drilling depth. n Tighten handle assembly by turning handle clockwise. ADJUSTING THE DRIL ...
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Ryobi D551H - page 13
12 13 OPERA TION TURNING THE HAMMER DRILL ON/OFF See Figure 8. T o turn the hammer drill on and off. n To turn the drill on: depress the switch trigger. n To turn the drill off: release the switch trigger. CHANGING THE ROT A TION See Figure 9. The direction of the chuck is controlled by the lever located above the switch trigger . NOTE: The design ...
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Ryobi D551H - page 14
14 15 WARNING: When servicing, use only identical Ryobi replacement parts. Use of any other parts may create a hazard or cause product damage. WARNING: Always wear safety goggles or safety glasses with side shields during power tool operation or when blowing dust. If operation is dusty , also wear a dust mask. GENERAL MAINTENANCE Avoid using solven ...
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Ryobi D551H - page 15
14 15 MAINTENANCE Ele ctr ic tool s used on fi ber g las s mater ial , wall boa rd , spac klin g compounds, or plaster are subject to accelerated wear and possible premature failure because the fiberglass chips and grindings ar e highly abrasive to bearings, brushes, commu- tator s, et c. Con seque ntly , we do not recomm ended using this tool for ...
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Ryobi D551H - page 16
R YOBI TECHNOLOGIES, INC. 1428 Pearman Dairy Road, Anderson, SC 29625 Post Office Box 1207, Anderson, SC 29622-1207 Phone 1-800-525-2579 www .ryobitools.com 983000-633 1-05 • SER VICE Now that you have purchased your tool, should a need ever exist for repair parts or service, simply contact your nearest Ryobi Authorized Service Center . Be sur e ...
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