67. In cold weather or when the tool has not beenused for a long time, let the tool warm up for awhile by operating it under no load. This willloosen up the lubrication. Without properwarm-up, hammering operation is difficult.8. Always be sure you have a firm footing.Be sure no one is below when using the toolin high locations.9. Hold the tool firmly with both hands.10. Keep hands away from moving parts.11. Do not leave the tool running. Operate the toolonly when hand-held.12. Do not point the tool at any one in the areawhen operating. The bit could fly out andinjure someone seriously.13. Do not touch the bit or parts close to the bitimmediately after operation; they may beextremely hot and could burn your skin.14. Some material contains chemicals which maybe toxic. Take caution to prevent dustinhalation and skin contact. Follow materialsupplier safety data.SAVE THESE INSTRUCTIONS.WARNING:DO NOT let comfort or familiarity with product(gained from repeated use) replace strict adherenceto safety rules for the subject product. MISUSE orfailure to follow the safety rules stated in thisinstruction manual may cause serious personalinjury.FUNCTIONAL DESCRIPTIONCAUTION:• Always be sure that the tool is switched off andunplugged before adjusting or checking functionon the tool.Switch actionFig.1FOR MODEL HR4511CCAUTION:• Before plugging in the tool, always check to seethat the switch trigger actuates properly andreturns to the "OFF" position when released.To start the tool, simply pull the switch trigger. Releasethe switch trigger to stop.FOR MODELS HR4510C/ HR4501CTrigger switchCAUTION:• Before plugging in the tool, always check to seethat the switch trigger actuates properly andreturns to the "OFF" position when released.• This switch functions when setting the tool insymbol and symbol modes.To start the tool, simply pull the switch trigger. Releasethe switch trigger to stop.Slide switchCAUTION:• Before plugging in the tool, always check to seethat the tool is switched off.• This switch functions only when setting the tool insymbol action mode.When using the tool in the hammering mode for a longtime, the slide switch is available. To start the tool, pushthe "I (ON)" side of the switch lever. To stop the tool,push the "O (OFF)" side of the switch lever.Fig.2Speed changeFig.3The revolutions and blows per minute can be adjustedjust by turning the adjusting dial. The dial is marked 1(lowest speed) to 5 (full speed).Refer to the table below for the relationship between thenumber settings on the adjusting dial and therevolutions/blows per minute.54321Number onadjusting dial Revolutions perminute Blows per minute2802602001501302,7502,5501,9501,4501,250008417