Makita HR5000 Owners Manual - Page 10

003216 1 When not using the center bit Screw the core bit on the adapter. Install the adapter with the core bit in the tool in the same manner as a drill bit. 2 1. Core bit 2. Adapter 003212 Rotate the change lever to the position. Rest the core bit on the concrete and turn the tool on. 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". MAINTENANCE CAUTION: • Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance. 1 1. Commutator 2. Insulating tip 3. Carbon brush 001146 Replacing carbon brushes 2 When the resin insulating tip inside the carbon brush is exposed to contact the commutator, it will automatically shut off the motor. When this occurs, both carbon brushes should be replaced. Keep the carbon brushes clean and free to slip 3 in the holders. Both carbon brushes should be replaced at the same time. Use only identical carbon brushes. 10