Hitachi DV20VB2 Instruction Manual - Page 12
IMPACT to ROTATION changeover Fig. 5 - hammer drill
UPC - 717709008380
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English 9. IMPACT to ROTATION changeover (Fig. 5) Shift the change lever between the right Change lever and left positions to switch easily between IMPACT (rotation and impact) and ROTATION (rotation only), respectively. To bore holes in hard materials such as concrete, stone and tiles, shift the change lever to the right-hand position Impact Rotation (as indicated by the mark). The drill bit operates by the combined actions of impact and rotation. Fig. 5 To bore holes in metal, wood and plastic, shift the change lever to the left-hand position (as indicated by the mark). The drill bit operates by rotational action only, as in the case of a conventional electric drill. CAUTION: ⅷ Do not use the Hammer Drill in the IMPACT function if the material can be bored by rotation only. Such action will not only reduce drill efficiency, but may also damage the drill tip. ⅷ Operating the Hammer Drill with the change lever in mid-position may result in damage. When switching, make sure that you shift the change lever to the correct position. NOTE: The change lever may not shift smoothly when changing from hammer drill mode to drill mode. In this case, switch ON and operate the machine for few seconds. The spindle shaft will then be pushed forward, and the change lever can be moved smoothly. 10. High-speed/Low-speed changeover Prior to changing speed, ensure that the switch is in the OFF position, and the drill has come to a complete stop. To change speed, rotate the gear shift dial as indicated by the arrow in Fig. 6. The numeral "1" engraved on the drill body denotes low speed, the numeral "2" denotes high speed. If it is hard to turn the gear shift dial, turn the chuck slightly in either direction and then turn the gear shift dial again. Gear Shift Dial Fig. 6 12