Hitachi VB16Y Instruction Manual - Page 22

English MAINTENANCE AND INSPECTION WARNING: Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection. 1. Inspecting the cutter Continued use of a dull or damaged cutter will result in reduced cutting efficiency and may cause overloading of the motor. Replace the cutter with a new one as soon as excessive abrasion is noted. 2. Inspecting the mounting screws Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws be loosened, retighten them immediately. WARNING: Using this Reber cutter/bender 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 noto become damaged and/or wet with oil or water. 4. Inspecting the carbon brushes (Fig. 24) The Motor employs carbon brushes which are No. of carbon consumable parts. When they become worn to or Wear limit brush near the "wear limit", it could result in motor trouble. When an auto-stop carbon brush is equipped, the motor will stop automatically. At 43 that time, replace both carbon brushes with new ones which have the same carbon brush Numbers 0.24" (6 mm) shown in the figure. In addition, always keep carbon brushes clean and ensure that they slide 0.67" (17 mm) freely within the brush holders. Fig. 24 NOTE: Use HITACHI carbon brush No. 43 indicated in Fig. 24. 5. Replacing carbon brushes Loosen the set screws and remove the tail cover. Remove the brush caps and carbon brushes. After replacing the carbon brushes, do not forget to tighten the brush caps securely and to mount the tail cover with set screws. 6. Service and repairs All quality power tools will eventually require servicing or replacement of parts because of wear from normal use. To assure that only authorized replacement parts will be used, all service and repairs must be performed by a HITACHI AUTHORIZED SERVICE CENTER, ONLY. 22