Hitachi CR18DLP4 Instruction Manual - Page 22

English MAINTENANCE AND INSPECTION WARNING: Be sure to turned off the switch and remove the battery before maintenance and inspection. 1. Inspecting the blade Continued use of a dull or damaged blade will result in reduced cutting efficiency and may cause overloading of the motor. Replace the blade with a new one as soon as excessive abrasion is noted. 2. Inspecting the screws Regularly inspect all screws and ensure that they are properly tightened. Should any of the screws be loosened, retighten them immediately. WARNING: Using this Cordless Reciprocating Saw 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. 31) Wear limit 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 0.12" (3 mm) worn to or near the "wear limit". In addition, always keep carbon brushes clean and ensure that they slide 0.45" (11.5 mm) freely within the brush holders. Fig. 31 NOTE: When replacing the carbon brush with a new one, be sure to use the Hitachi Carbon Brush Code No. 999058. Nail of carbon brush 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 slotted-head screw driver, etc., as shown in Fig. 32, Fig. 33. When installing the carbon brush, choose the direction so that the nail of the carbon brush (Fig. 32) agrees with the contact portion outside the brush tube (Fig. 34). Then push it in with a finger. Lastly, install the brush cap. Protrusion of carbon brush Fig. 32 22