User manual MAKITA HR3550C

[. . . ] Prolonged exposure to high intensity noise can cause hearing loss. Wear a hard hat (safety helmet), safety glasses and/or face shield. Be sure the bit is secured in place before operation. The screws can come loose easily, causing a breakdown or accident. [. . . ] The action mode cannot be changed directly from ``hammering only'' to ``rotation only'' or from ``rotation only'' to ``hammering only''. First set the change lever and the shift lever to ``rotation with hammering'' mode position shown in Fig. Then set them to the position for ``hammering only'' or ``rotation only''. CAUTION: Before plugging in the tool, always check to see that the switch trigger actuates properly and returns to the ``OFF'' position when released. The revolutions and blows per minute can be adjusted just by turning the adjusting dial. the dial is marked 1 (lowest speed) to 6 (full speed). Refer to the table below for the relationship between the number settings on the adjusting dial and the revolutions/blows per minute. CAUTION: When the bit begins to break through concrete or if the bit strikes reinforcing rods embedded in concrete, the tool may react dangerously. Maintain good balance and safe footing while holding the tool firmly with both hands to prevent dangerous reaction. Keep the tool in position and prevent it from slipping away from the hole. Do not apply more pressure when the hole becomes clogged with chips or particles. Instead, run the tool at an idle, then remove from the hole. By repeating this several times, the hole will be cleaned out. In fact, this excessive pressure will only serve to damage the tip of your bit, decrease the tool performance and shorten the service life of the tool. Never use ``rotation with hammering'' when the drill chuck assembly is installed on the tool. After adjusting, tighten the clamp screw firmly. NOTE: The depth gauge cannot be used at the position where the depth gauge strikes against the gear housing/motor housing. The torque limiter will actuate when a certain torque level is reached. CAUTION: As soon as the torque limiter actuates, switch off the tool immediately. This will help prevent premature wear of the tool. The green power-ON indicator lamp lights up when the tool is switched ON. If the indicator lamp is lit but the tool does not start, the carbon brushes may be worn out, or the electric circuit or the motor may be defective. [. . . ] 30 g) can cause faulty hammering action or tool failure. Fill only with the specified amount of grease. Be careful not to damage the terminals or lead wires especially when wiping out the old grease or installing the handle. It is made of resin and is subject to breakage. [. . . ]