Makita HR4041C Owners Manual - Page 5

Installing or removing the bit Press in the tool retainer and turn it until the red dots on the tool retainer and the tool holder are aligned. Release the tool retainer. 1. Red dot (Tool 1 holder) 2. Red dot (Tool 2 retainer) OPERATION CAUTION: Always use the side grip (auxiliary handle) and firmly hold the tool by both side grip and switch handle during operations. Hammer drilling operation 007794 Insert the bit into the tool holder as far as it will go. Press in the tool retainer and turn it a full 180 degrees. Then release it to secure the bit. 1. Tool retainer 1 007795 To remove the bit, follow the installation procedure in reverse. Depth gauge 1 2 1. Depth gauge 2. Clamp screw 007799 007797 Set the change lever to the symbol. Position the bit at the desired location for the hole, then pull the switch trigger. Do not force the tool. Light pressure gives best results. 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 the bit partially from the hole. By repeating this several times, the hole will be cleaned out and normal drilling may be resumed. CAUTION: • There is a tremendous and sudden twisting force exerted on the tool/bit at the time of hole break-through, when the hole becomes clogged with chips and particles, or when striking reinforcing rods embedded in the concrete. Always hold the tool firmly with both hands. Failure to do so may result in the loss of control of the tool and potentially severe injury. Blow-out bulb (optional accessory) 1. Blow-out bulb The depth gauge is convenient for drilling holes of uniform depth. Insert the depth gauge into the hole in the grip base. Adjust the depth gauge to the desired depth and then tighten the clamp screw to secure the depth gauge. NOTE: • The depth gauge cannot be used at the position where the depth gauge strikes against the tool body. 1 002449 After drilling the hole, use the blow-out bulb to clean the dust out of the hole. 5