Hitachi G10SS Instruction Manual - Page 10

English Wrench Depressed center wheel Wheel washer Spindle Wheel nut CAUTION: Tighten the wheel nut securely and confirm that the depressed center wheel does not wobble. 2. Disassembly To remove the depressed center wheel, simply reverse the above-mentioned procedure. Wheel guard Fig. 5 Push button MAINTENANCE AND INSPECTION WARNING: ⅷ Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection. ⅷ Using cracked, deformed or damaged wheels can lead to wheel breakage and resulting serious injury. 1. Replacing the depressed center wheel Replace the depressed center wheel when it has been worn out to about 2-3/8" (60mm) in external diameter. Confirm that there is no crack or any damage to the depressed center wheel. If there is a crack or a transformation in the wheel, replace it immediately. 2. Inspecting the screws Regularly inspect all screws and ensure that they are fully tightened. Should any of the screws be loosened, retighten them immediately. No. of carbon Wear limit brush 21 0.24" (6mm) 0.67" (17mm) WARNING: Using this grinder with loosened screws is Fig. 6 extremely dangerous. CAUTION: Using this grinder with a carbon brush which is 3. Confirm that there is no damage in the wheel worn in excess of the wear limit will damage the guard, the electrical cord and the housing, etc. motor. Check that the on/off switch operates normally. 4. Inspecting the carbon brushes (Fig. 6) NOTE: The motor employs carbon brushes which are Use HITACHI carbon brush No. 21 indicated in Fig. consumable parts. Replace the carbon brush with 6. a new one when it becomes worn to its wear limit. Always keep carbon brushes clean and ensure that ⅜ Replacing carbon brushes: they slide freely within the brush holders. Remove the brush caps (Fig. 1) with a slotted screwdriver. The carbon brushes can then be easily removed. 10