Maintenance And Inspection; Inspecting The Saw Blade; Inspecting The Carbon Brushes; Inspecting The Mounting Screws - Hitachi C 10RA2 Technical And Service Manual

9. MAINTENANCE AND INSPECTION

WARNING: To avoid an accident or personal injury, always confirm that the switch is turned OFF and
that the power plug has been disconnected from the receptacle before performing any
maintenance or inspection of this tool.

9-1. Inspecting the Saw Blade

Always replace the saw blade immediately upon the first sign of deterioration or damage. A damaged saw blade
can cause personal injury and a worn saw blade can cause ineffective operation and possible overload to the
motor.
CAUTION: Never use a dull saw blade. When a saw blade is dull, its resistance to the hand pressure
applied by the tool handle tends to increase, making it unsafe to operate the power tool.
9-2. Inspecting the Carbon Brushes (Fig. 21 and Fig. 22)
The carbon brushes in the motor are expendable parts. If the carbon brushes become excessively worn, motor
trouble might occur. Therefore, inspect the carbon brushes periodically and replace them. Check the carbon
brushes after the first 50 hours of use for a new machine or after a new set of carbon brushes have been installed.
After the first check, examine them after about every 10 hours of use until such time that replacement is
necessary. When the carbon on either brush is worn to 5 mm (3/16") in length or if either spring or shunt wire is
burned or damaged in any way, replace both carbon brushes (see Fig. 21). If the carbon brushes are found to be
serviceable after removing, reinstall them in the same position as before. Also, keep the carbon brushes clean so
that they will slide smoothly within the brush holders. The carbon brushes can easily be removed after removal of
the brush caps (see Fig. 22) with a flatblade screwdriver.
17 mm (43/64")

9-3. Inspecting the Mounting Screws

Regularly inspect each component of the power tool for looseness. Re-tighten mounting screws on any loose
part.
WARNING: To prevent personal injury, never operate the power tool if any components are loose.
Wear limit line
5 mm (3/16")
Fig. 21
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Brush cap
Motor
Fig. 22