5warm-up, hammering operation is difficult.8. Always be sure you have a firm footing.Be sure no one is below when using the tool inhigh 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. Do not operate the tool at no-loadunnecessarily.15. 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 or failure to follow the safety rules stated inthis instruction manual may cause serious personalinjury.FUNCTIONAL DESCRIPTIONCAUTION:• Always be sure that the tool is switched off andunplugged before adjusting or checking function onthe tool.Switch action1ONOFF010454CAUTION:• Before plugging in the tool, always check to seethat the tool is switched off.• Switch can be locked in "ON" position for ease ofoperator comfort during extended use. Applycaution when locking tool in "ON" position andmaintain firm grasp on tool.To start the tool, push the switch lever "ON (I)" on the leftside of the tool. To stop the tool, push the switch lever"OFF (O)" on the right side of the tool.Speed change1010465The blows per minute can be adjusted just by turning theadjusting dial. This can be done even while the tool isrunning. The dial is marked 1 (lowest speed) to 5 (fullspeed).Refer to the table below for the relationship between thenumber settings on the adjusting dial and the blows perminute.Number on adjusting dial Blows per minute543212,6502,4001,7501,3001,100010466CAUTION:• The speed adjusting dial can be turned only as faras 5 and back to 1. Do not force it past 5 or 1, orthe speed adjusting function may no longer work.For Model HM0871C onlyNOTE:• Blows at no load per minute becomes smaller thanthose on load in order to reduce vibration under noload, but this does not show trouble. Onceoperation starts with a bit against concrete, blowsper minute increase and get to the numbers asshown in the table. When temperature is low andthere is less fluidity in grease, the tool may nothave this function even with the motor rotating.1. Adjusting dial1. Switch lever