Hitachi WH18DFL Instruction Manual - Page 15

English Movement NOTE: A buzzing noise is produced when the motor is about to rotate; this is only a noise, not a machine failure. Driver Hexagonal bit hole in the anvil Guide sleeve Fig. 13 (1) Pull the guide sleeve forward. (2) Insert the bit into the hexagonal hole in the anvil. (3) Release the guide sleeve and it returns to its origianl position. CAUTION: If the guide sleeve does not return to its original position, then the bit is not installed properly. 3. Removing the bit Please do the opposite point on the method of installing bit. 4. Confirm that the battery is mounted correctly. 5. Check the rotational direction The bit rotates clockwise (viewed from the rear side) by pushing the R-side of the push button. The L-side of the push button is pushed to turn the bit counterclockwise. (See Fig. 14). (The L and R marks are engraved on the body.) Push button 7. Tightening and loosening screws Install the bit that matches the screw, line up the bit in the grooves of the head of the screw, then tighten it. Push the impact driver just enough to keep the bit fitting the head of the screw. CAUTION: ● Applying the impact driver for too long tightens the screw too much and can break it. ● Tightening a screw with the impact driver at an angle to that screw can damage the head of the screw and the proper force will not be transmitted to the screw. Tighten with this impact driver lined up straight with the screw. OPERATIONAL CAUTIONS 1. Resting the unit after continuous work After use for continuous bolt-tightening work, rest the unit for 15 minutes or so when replacing the battery. The temperature of the motor, switch, etc., will rise if the work is started again immediately after battery replacement, eventually resulting in burnout. CAUTION: Do not touch the hammer case, as it gets very hot during continuous work. R L Push Push Fig. 14 CAUTION: The push button can not be switched while the impact driver is turning. To switch the push button, stop the impact driver, then set the push button. 6. Switch operation ⅜ When the trigger switch is depressed, the tool rotates. When the trigger is released, the tool stops. ⅜ The rotational speed can be controlled by varying the amount that the trigger switch is pulled. Speed is low when the trigger switch is pulled slightly and increases as the trigger switch is pulled more. 2. Cautions on use of the speed control switch This switch has a built-in, electronic circuit which steplessly varies the rotation speed. Consequently, when the switch trigger is pulled only slightly (low speed rotation) and the motor is stopped while continuously driving in screws, the components of the electronic circuit parts may overheat and be damaged. 3. Tightening torque Refer to Fig. 15 for the tightening torque of bolts (according to size), under the conditions shown in Fig. 16. Please use this example as a general reference, as tightening torque will vary according to tightening conditions. NOTE: ⅜ If a long striking time is used, screws will be strongly tightened. This may cause the screw to break, or may damage the end of the bit. ⅜ If the unit is held at an angle to the screw being tightened, the head of the screw may be damaged, or the specified torque may not be transmitted to the screw. Always keep the unit and the screw being tightened in a straight line. 15