Cutting Procedures; Mounting And Dismounting The Saw Blade; Maintenance And Inspection - Hitachi C 9SA3 Handling Instructions Manual

When the saw is shipped from the factory, the linear
portion of a front scale on the guide piece is aligned with
the central position of the saw blade (Fig. 9).
Loosen the fi xed M4 screw on the guide piece, should
the fi xing position be wrong, and make necessary
adjustment of the position.
5. Using the dust collector
To use the vacuum cleaner to gather up saw dust, attach
the suction hose to the dust collector which is attached
to the main unit by M4 screw. When attaching the dust
collector always be sure to change the lever to the short
type at this same time (Fig. 10).
CAUTION
Continuing to use the lever that was attached to the main
unit prior to shipping from the factory will cause it to bind
on the dust collector and will interfere with the lower
guard operation.

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. 9).
When the base is not slanted, use the large cutout as the
guide (Fig. 9, Fig. 11 (A)).
If the base is slanted (45 degrees), use the small front
scale as the guide (Fig. 9, Fig. 11 (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.
○ Before starting to saw, ensure that the saw blade has
reached full speed revolution.
○ Should the saw blade stop or make an abnormal noise
while operating, promptly turn OFF the switch.
○ 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 fi nished 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) Set the cutting volume at maximum, and place the
Circular Saw as shown in Fig. 12.
(2) Depress the lock lever, lock the spindle, and remove the
hexagonal-socket bolt with the Hex. bar wrench.
(3) 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) Thoroughly remove any sawdust which has accumulated
on the spindle, bolt and washers.
7
(2) As shown in Fig. 13, 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 fi tted to the saw blade sides.
(3) 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.
(4) Using the fi ngers, tighten the hexagonal-socket 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, reconfi rm that the
lock lever is fi rmly secured in the prescribed position.

MAINTENANCE AND INSPECTION

1. Inspecting the saw blade
Since use of a dull saw blade will degrade effi ciency 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. 14)
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.
CAUTION
When replacing the new carbon brushes, always
use genuine Hitachi carbon brushes with the number
specifi ed in the drawing.
4. Replacing carbon brushes
Disassemble the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed.
5. Motor unit maintenance
The motor winding is an important part of this tool. Avoid
damaging and be careful to avoid contact with cleaning
oil or water.
After 50 hours of use, clean the motor by blowing into the
ventilation holes of the motor housing with dry air from an
air gun or other tool (Fig. 16).
Dust or particle accumulation in the motor can result in
damage.
6. Replacing supply cord
If the replacement of the supply cord is necessary, this
has to be done by the manufacturer of this agent in order
to avoid a safety hazard.
7. Inspecting and maintaining the lower guard
Always make sure that the lower guard moves smoothly.
In the event of any malfunction, immediately repair the
lower guard.
For cleaning and maintenance, use an air gun or other
tool to blow clean the space between the lower guard and
gear cover as well as the rotation part of the lower guard
with dry air (Fig. 16).
Doing so is eff ective for the emission of chips or other
particles.
Accumulation of chips or other particles around the lower
guard may result in malfunction or damage.