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CUTTING PROCEDURES
1. Place the base on the material, then align the
premarked line and the sawblade with the guide
piece front scale section at the front of the base
(Fig. 11).
When the base is not slanted, use the large cutout
as the guide (Fig. 11, Fig. 12 (A)).
If the base is slanted (45 degrees), use the small
front scale as the guide (Fig. 11, Fig. 12 (B)).
2. Ensure that the switch is turned to the ON position
before the saw blade comes in contact with the
lumber. The switch is turned ON when the trigger
is squeezed; and OFF when the trigger is released.
3. Moving the saw straight at a constant speed will
produce optimum cutting.
CAUTIONS
Prior to cutting operation, make sure the material you
are going to cut. If the material to be cut is expected to
generate harmful / toxic dusts, make sure the dust bag or
appropriate dust extraction system is connected with
dust outlet tightly.
Wear the dust mask additionally, if available.
A coating of PFTE is applied to the bases. Be careful not to
press too hard on the unit body since this tends to place a
heavy load on the motor. Using a gentle pressure will
make the piece slide easier and allow cutting with less
force. Trying to cut wood that is covered with hard particle
material such as sand or metal chips tends to easily
scratch damage the surface coating so use caution.
Before starting to saw, ensure that the saw blade
has reached full speed revolution.
Should the saw blade be stopped or made an
abnormal noise during operation, turn off the switch
immediately.
Always take care in preventing the power cord from
coming near the revolving saw blade.
Using the circular saw with the saw blade facing
upwards or sideways is very hazardous. Such
uncommon applications should be avoided.
When cutting materials, always wear protective
glasses.
When finished with a job, pull out the plug from
the receptacle.
MOUNTING AND DISMOUNTING THE SAW
BLADE
CAUTION
To avoid serious accident, ensure the switch is in the
OFF position, and the power source is disconnected.
1. Dismounting the saw blade
(1) Loosen the knob and slightly reduce the cutting
depth from maximum. (Fig. 2)
(2) Place the Circular Saw as shown in Fig. 17.
(3) Depress the lock lever, lock the spindle, and remove
the hexagonal-head bolt with the box wrench.
(4) While holding the lower guard lever to keep the
lower guard fully retracted into the saw cover,
remove the saw blade.
2. Mounting the Saw Blade
(1) Loosen the knob and slightly reduce the cutting
depth from maximum. (Fig. 2)
(2) Thoroughly remove any sawdust which has
accumulated on the spindle, bolt and washers.
11
(3) As shown in Fig. 18, the side of Washer (A) with
a projected center the same diameter as the inner
diameter of the saw blade and the concave side
of Washer (B) must be fitted to the saw blade sides.
(4) To assure proper rotation direction of the saw blade,
the arrow direction on the saw blade must coincide
with the arrow direction on the saw cover.
(5) Using the fingers, tighten the hexagonal-head bolt
retaining the saw blade as much as possible. Then
depress the lock lever, lock the spindle, and
thoroughly tighten the bolt.
CAUTION
After having attached the saw blade, reconfirm that the
lock lever is firmly secured in the prescribed position.
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 (Fig. 19)
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 figure 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.
CAUTION
When replacing the new carbon brushes, always
use genuine Hitachi carbon brushes with the number
specified in the drawing.
For models C6BUY and C7BUY, the brake may not
work if other than the specified carbon brushes are
used.
When the brake becomes ineffective, replace the
carbon brushes with new ones.
4. Replacing carbon brushes
Disassemble the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed.
5. 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.
6. 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. 20) and loosen the lever
and wing-bolt. (Fig. 4 (A), Fig. 4 (B))
(2) Apply a square to the base and the saw blade and
turning the slotted set screw with a slotted-head
screwdriver, shift the position of the base to produce
the desired right angle.
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