Hitachi C7SB - Page 12

MAINTENANCE AND INSPECTION
CAUTION;
Be sure to switch power OFF and disconnect the plug during maintenance and inspection.
1 . Inspecting the saw blade
Since use of a dull saw blade will degrade efficiency and cause possible motor malfunction.sharpen
or replace the saw blade as soon as 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 loose.retighten them immediately. Failure to do so could result in serious hazard.
3. Inspecting the carbon brushes
The motor employs carbon brushes which
are consumable parts. Since an excessively
worn carbon brush could result in motor
trouble.replace the carbon brush with a new
one which has the same carbon brush No.
shown in figure 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.
Replacing a carbon brush
Wear Limit
38
o.er; _
mm
^No.of Carbon Brush
Fig. 14
The carbon brush can then be easily Disassemble the brush cap with a minus head screwdriver,
removed.
5. Adjusting the base and saw blade to maintain perpendicularity
The angle between the base and the saw blade has been adjusted to 90°.however should this
perpendicularity be lost for some reason .adjust in the following manner.
(1) Turn the base face up (Fig . 15) and loosen the
wing bolt(A)(Fig.8).
(2) Apply a square to the base and the saw bla¬
de and.turning the slotted set screw with a
minus screwdriver.shift the position of the base
to produce the desired right angle.
Fig 15
Note:
Due to HITACHI’S continuing program of research and development,the specifications herein are subject
to change without prior notice.