Hitachi G18DL Instruction Manual - Page 16

English MAINTENANCE AND INSPECTION WARNING: ⅷ Be sure to turned off the switch and pull out the battery. 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. Check the Screws Loose screws are dangerous. Regularly inspect them and make sure they are tight. When installing the carbon brush, choose the direction so that the nail of the carbon brush agrees with the contact portion outside the brush tube. Then push it in with a finger as illustrated in Fig. 12. Lastly, install the brush cap. Nail of carbon brush Protrusion of carbon brush CAUTION: Using this power tool with loosened screws is extremely dangerous. 3. Maintenance of the motor The motor unit winding is the very "heart" of the power tool. Exercise due care to ensure the winding does not become damaged and/or wet with oil or water. 4. Inspecting the carbon brushes (Fig. 9) The motor employs carbon brushes which are consumable parts. Since and excessively worn carbon brush can result in motor trouble, replace the carbon brush with new ones when it becomes worn to or near the "wear limit". In addition, always keep carbon brushes clean and ensure that they slide freely within the brush holders. Wear limit Fig. 10 Fig. 11 0.12" (3 mm) 0.45" (11.5 mm) Fig. 9 NOTE: When replacing the carbon brush with a new one, be sure to use the Hitachi Carbon Brush Code No. 999054. 5. Replacing carbon brushes Take out the carbon brush by first removing the brush cap and then hooking the protrusion of the carbon brush with a flat head screw driver, etc., as shown in Fig. 11. 16 Contact portion outside brush tube Fig. 12 CAUTION: ● Be absolutely sure to insert the nail of the carbon brush into the contact portion outside the brush tube. (You can insert whichever one of the two nails provided.) ● Caution must be exercised since any error in this operation can result in the deformed nail of the carbon brush and may cause motor trouble at an early stage.