User manual MAKITA HR3520

[. . . ] The screws can come loose easily, causing a breakdown or accident. In cold weather or when the tool has not been used for a long time, let the tool warm up for several minutes by operating it under no load. Be sure no one is below when using the tool in high locations. Do not point the tool at any one in the area when operating. [. . . ] 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. Turn the tool on and apply slight pressure on the tool so that the tool will not bounce around, uncontrolled. Pressing very hard on the tool will not increase the efficiency. When using the center bit Screw the core bit on the adapter. Once the core bit has cut a shallow groove into the concrete, remove the center bit. Then rest the core bit on the concrete and turn the tool on. 9) (2) Hold the adapter with the wrench, insert the rod (optional accessory) into the hole in the core bit and tap with a hammer to unscrew. 10) When not using the center bit Screw the core bit on the adapter. Once the core bit has cut a shallow groove into the concrete, rotate the change lever to the position and resume drilling. NOTE: No problem is caused even if the core bit unscrews slightly during brief use since the core bit rotates in the tightening direction. To remove the core bit, follow the same removal procedures covered in When using the center bit. Do not rotate the change lever when the tool is running under load. To avoid rapid wear on the mode change mechanism, be sure that the change lever is always positively located in one of the two action mode positions. Before plugging in the tool, always check to see that the switch trigger actuates properly and returns to the "OFF" position when released. â· Do not tape, tie or otherwise secure the trigger in the "ON" position. 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. [. . . ] 60 g) can cause faulty hammering action or tool failure. Fill only with the specified amount of grease. Reinstall the crank cap and tighten with the lock nut wrench. do not tighten the crank cap excessively. [. . . ]