Hitachi G 23ST Handling Instructions Manual page 6

English
MAINTENANCE AND INSPECTION
1. Inspecting the depressed center wheel
Ensure that the depressed center wheel is free of cracks
and surface defects.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws be
loose, retighten them immediately. Failure to do so could
result in serious hazard.
3. Inspecting the carbon brushes (Fig. 7)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brushes with new ones having the same carbon brush
No. ⓑ shown in the fi gure when it becomes worn to or
near the "wear limit" ⓐ. In addition, always keep carbon
brushes clean and ensue that they slide freely within the
brush holders.
4. Replacing carbon brushes (Fig. 7)
〈Disassembly〉
(1) Loosen the D4 tapping screw ⓒ retaining the brush
cover ⓓ and remove the brush cover.
(2) Use the auxiliary hexagonal wrench or small screwdriver
to pull up the edge of the spring ⓔ that is holding down
the carbon brush. Remove the edge of the spring toward
the outside of the brush holder ⓕ.
(3) Remove the end of the pig-tail ⓖ on the carbon brush
ⓗ from the terminal section of brush holder and then
remove the carbon brush from the brush holder.
〈Assembly〉
(1) Insert the end of the pig-tail of the carbon brush in the
terminal section of brush holder.
(2) Insert the carbon brush in the brush holder.
(3) Use the auxiliary hexagonal wrench or small screwdriver to
return the edge of the spring to the head of the carbon brush.
(4) Mount the tail cover and tighten the D4 tapping screw.
5. Replacing supply cord
If the replacement of the supply cord is necessary, it
has to be done by HiKOKI Authorized Service Center to
avoid a safety hazard.
6. 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.
CAUTION
In the operation and maintenance of power tools, the
safety regulations and standards prescribed in each
country must be observed.
NOTE
Due to HiKOKI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
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