DUSTLESS CIRCULAR SAW
MODEL C 5YA
HANDLING INSTRUCTIONS
Note:
Before using this Power Tool, carefully read through these HANDLING
INSTRUCTIONS to ensure efficient, safe operation. It is recommended that
these INSTRUCTIONS be kept readily available as an important reference
when using this power tool.
2
GENERAL OPERATIONAL PRECAUTIONS
WARNING! When using electric tools, basic safety
precautions should always be followed to reduce the
risk of fire, electric shock and personal injury, including
the following.
Read all these instructions before operating this
product and save these instructions.
For safe operations:
1. Keep work area clean. Cluttered areas and benches
invite injuries.
2. Consider work area environment. Do not expose
power tools to rain. Do not use power tools in
damp or wet locations. Keep work area well lit.
Do not use power tools where there is risk to
cause fire or explosion.
3. Guard against electric shock. Avoid body contact
with earthed or grounded surfaces. (e.g. pipes,
radiators, ranges, refrigerators).
4. Keep children away. Do not let visitors touch the
tool or extension cord. All visitors should be kept
away from work area.
5. Store idle tools. When not in use, tools should
be stored in a dry, high or locked up place, out
of reach of children.
6. Do not force the tool. It will do the job better and
safer at the rate for which it was intended.
7. Use the right tool. Do not force small tools or
attachments to do the job of a heavy duty tool.
Do not use tools for purposes not intended; for
example, do not use circular saw to cut tree limbs
or logs.
8. Dress properly. Do not wear loose clothing or
jewelry, they can be caught in moving parts.
Rubber gloves and non-skid footwears are
recommended when working outdoors. Wear
protecting hair covering to contain long hair.
9. Use eye protection. Also use face or dust mask
if the cutting operation is dusty.
10. Connect dust extraction equipment.
If devices are provided for the connection of dust
extraction and collection facilities ensure these are
connected and properly used.
11. Do not abuse the cord. Never carry the tool by
the cord or yank it to disconnect it from the
receptacle. Keep the cord away from heat, oil and
sharp edges.
12. Secure work. Use clamps or a vise to hold the
work. It is safer than using your hand and it frees
both hands to operate tool.
13. Do not overreach. Keep proper footing and balance
at all times.
14. Maintain tools with care. Keep cutting tools sharp
and clean for better and safer performance. Follow
instructions for lubrication and changing
accessories. Inspect tool cords periodically and if
damaged, have it repaired by authorized service
center. Inspect extension cords periodically and
replace, if damaged. Keep handles dry, clean, and
free from oil and grease.
15. Disconnect tools. When not in use, before servicing,
and when changing accessories such as blades,
bits and cutters.
16. Remove adjusting keys and wrenches. Form the
habit of checking to see that keys and adjusting
wrenches are removed from the tool before turning
it on.
17. Avoid unintentional starting. Do not carry a
plugged-in tool with a finger on the switch. Ensure
switch is off when plugging in.
18. Use outdoor extension leads. When tool is used
outdoors, use only extension cords intended for
outdoor use.
19. Stay alert. Watch what you are doing. Use common
sense. Do not operate tool when you are tired.
20. Check damaged parts. Before further use of the
tool, a guard or other part that is damaged should
be carefully checked to determine that it will
operate properly and perform its intended function.
Check for alignment of moving parts, free running
of moving parts, breakage of parts, mounting and
any other conditions that may affect its operation.
A guard or other part that is damaged should be
properly repaired or replaced by an authorized
service center unless otherwise indicated in this
handling instructions. Have defective switches
replaced by an authorized service center. Do not
use the tool if the switch does not turn it on and
off.
21. Warning
The use of any accessory or attachment, other
than those recommended in this handling
instructions, may present a risk of personal injury.
22. Have your tool repaired by a qualified person.
This electric tool is in accordance with the relevant
safety requirements. Repairs should only be carried
out by qualified persons using original spare parts.
Otherwise this may result in considerable danger
to the user.
PRECAUTIONS ON USING CIRCULAR SAW
1. Do not use saw blades which are deformed or
cracked.
2. Do not use saw blades made of high speed steel.
3. Do not use saw blades which do not comply with
the characteristics specified in these instructions.
4. Do not stop the saw blades by lateral pressure
on the side surface of disc.
5. Always keep the saw blade sharp.
6. Ensure that the safety cover moves smoothly and
freely.
7. Never use the circular saw with its safety cover
fixed in the open position.
8. Ensure that the retraction mechanism of the guard
system operates accurately.
9. Never operate the circular saw with grasping the
saw blade upside down or to the lateral direction.
10. Ensure that the material is free of foreign matters
such as nails.
11. For model C5YA, the saw blade’s diameters which
can be mounted are 125 mm or less.
12. Be careful of brake kickbac.
This circular saw incorporates an electric brake
that functions when the switch is released. As
there is some kickback when the brake functions,
be sure to hold the main body securely.
3
STANDARD ACCESSORIES
(1) Box wrench ............................................................... 1
(2) Guide .......................................................................... 1
Standard accessories are subject to change without
notice.
OPTIONAL ACCESSORIES (sold separately)
(1) Diamond wheel (Dia. 106 mm) for the fiber cement
boards.
(2) Carbide Tipped Saw Blade (Dia. 125 mm) for the
gypsum board.
(3) Rubber Adapter (Fig. 15)
Optional accessories are subject to change without
notice.
APPLICATION
(1) Cutting the hard boards types T9 and T7.
(ex. harditex, hardiflex, etc.)
(2) Cutting the gypsum board.
PRIOR TO OPERATION
1. Power source
Ensure that the power source to be utilized conforms
to the power requirements specified on the product
nameplate.
2. Power switch
Ensure that the power switch is in the OFF position.
If the plug is connected to a receptacle while the
power switch is in the ON position, the power tool
will start operating immediately, which could cause
a serious accident.
3. Extension cord
When the work area is removed from the power
source, use an extension cord of sufficient thickness
and rated capacity. The extension cord should be
kept as short as practicable.
4. Prepare a wooden workbench (Fig. 1)
Since the saw blade will extend beyond the lower
surface of the lumber, place the lumber on the
workbench prior to cutting. If a square block is
utilized as the workbench, adjust leveling to ensure
that it is properly stabilized. An unstable workbench
will result in hazardous operation.
CAUTION:
● To avoid possible accident, remains always ensure
that the portion of workpiece after cutting is securely
anchored or held in position.
Fig. 1
ADJUSTING THE SAW PRIOR TO USE
1. Adjusting the cutting depth
As shown in Fig. 2, hold the handle with one hand
while loosening the lever with the another hand.
The cutting depth can be adjusted by swiveling the
base to the dasired position. In such manner adjust
the cutting depth and then securely tighten the
lever.
Fig. 2
SPECIFICATIONS
Model C5YA
Voltage 230 V
Cutting Depth 37 mm Max.
Power Input 1000 W
Capacity 125 mm Max.
Full Load Amp. 4.6 A
Dimensions (Length
×
Heigth
×
Width) 284 mm
×
208 mm
×
320 mm
No Load Speed 5000/min
Weight (without cord) 3.1 Kg
Workpiece
Base
Workbench
Saw Blade
Lever
Handle
Base
4
2. Aligning the position of the saw blade
(1) Align the position of the cutting edge of the blade
using the standard line on forward edge of the table
insert portion of the base plate (See Fig. 3(A)).
(2) Position the slide plate on the sighting line, using
your fingers. (See Fig. 3(B)).
Fig. 3(A)
Fig. 3(B)
3. Regulating the guide (Fig. 4)
The cutting position can be regulated by moving
the guide to the left or right after loosening its
wing-bolt. The guide may be mounted on either the
right or left side of the base.
Fig. 4
CUTTING PROCEDURES
1. Place the base on the workpiece, then align the
premarked line and the sawblade with the guide
slot at the front of the base. (Fig. 5)
Fig. 5
2. Ensure that the switch is turned ON position before
the saw blade comes in contact with the workpiece.
The switch is turned ON when the trigger is pulled;
and OFF when the trigger is released.
3. Moving the saw straight with brisk speed will resultin
optimum cutting.
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 be alert for the power cord not to contact
the revolving saw blade.
● It should be used to cut a workpiece of Hard Board
at one cut, and do not cut workpieces piled up.
● It should be always connected to vacuum cleaner
when cutting Hard Boards.
MOUNTING AND DISMOUNTING THE DUST
BOX
CAUTION:
● To avoid serious accident, the switch is in the OFF
position and disconnect the plug from the receptacle.
1. Mounting the dust box:
(1) Loosen the lever and set cutting depth at minimum
and then tighten the lever as shown Fig. 8(A).
(2) Align the gear cover catch with the setting mark
(triangle mark) on the inset part of the dust box.
(See Fig. 6).
Fig. 6
Slide plate
Wing bolt
Base
Guide
Workpiece
Premarked
line
Guide slot
Dust box
Gear cover
Setting mark
(Triangle mark)
Slide plate
Table insert portion
Base
Standard line
Bevel plate
5
(3) Pull the dust box in the direction indicated by arrow
“A”. (See Fig. 7)
Fig. 7
(4) Lifting the dust box slightly, push it in the direction
indicated by arrow “B” (See Fig. 7). Push the dust
box into position so that it aligns with the edge
of the gear cover (See Fig. 8(A)).
Fig. 8(A)
(5) Fasten the dust box into position by tightening the
M6 screw. (See Fig. 8(B)).
Fig. 8(B)
NOTE:
● Moving the inset hooking part of the dust box in
any other position than shown by the arrow as
indicated above may bend or damage it.
CAUTION:
● Be sure to check whether the gear cover and the
dust box are fixed firmly in place before using the
tool.
2. Dismounting the dust box
Loosen the lever and set the base at minimum
cutting depth and dismount the dust box by going
through the steps for mounting in reverse order.
MOUNTING AND DISMOUNTING THE SAW
BLADE
CAUTION:
● To avoid serious accident, ensure the switch is in
OFF position and disconnect the plug from the
receptacle.
1. Mounting the saw blade:
(1) Loosen the lever and set cutting depth at minimum
and then tighten the lever as shown Fig. 2.
(2) Loosen the M6 screw and dismount the dust box
from gear cover. (Fig. 8(B), Fig. 7)
(3) Depress the lock lever and lock the spindle, and
remove the hexagonal head bolt with the provided
box wrench. (Fig. 9)
Then remove Washer(B). (Fig. 10)
Fig. 9
Fig. 10
NOTE:
● Thoroughly remove any sawdust which has
accumulated on the spindle, bolt and washers.
Gear cover
Lever
Dust box
B
Lever
Gear cover
Dust box
Base
Base
Gear cover
Dust box
M6 Screw
Box
wrench
Lock lever
Hexagonal
head bolt
Saw blade
ø19
Washer (B)
Spindle
Recessed portion
Washer (A)
A
ø20
6
(4) Put the provided collar into washer (A).
(5) Align the beveled part of the spindle parallel with
the guide line on the safety cover.
(6) Position the side of washer (A) with the 2 mm hole
(0.3 mm) so that it is toward the saw blade. Put
the concave side of washer (B) toward the saw
blade. (See Fig. 10).
(7) Place the saw blade inside the safety cover and the
slide cover. If the saw blade gets caught on the
safety cover while doing this, move it left or right
until it is positioned properly inside the covers. (See
Fig. 11).
Fig. 11
NOTE:
● In case the hole diameter of your saw blade does
not correspond to that of Washer (A), please contact
the shop where you purchased the Circular Saw.
(8) To assure proper rotation direction of the saw blade,
the arrow direction "C" on the gear cover must
correspond to saw blade rotating direction. (Fig. 11)
(9) Tighten the hexagonal head bolt retaining the saw
blade properly by hand. Then depress the lock
lever, lock the spindle, and thoroughly tighten the
bolt.
(
10
) Attach the dust box and tighten the M6 screw
firmly.
2. Dismounting the saw blade:
To dismount the blade carry out the mounting steps
described above in reverse order.
CAUTION
After the saw blade have been attached, confirm
that the lock lever is properly secured in the
prescribed position.
DISCARDING CUTTING DUST
CAUTION:
● To avoid serious accident, the switch is in the OFF
position and disconnect the plug from the receptacle.
1. Discarding the cutting dust.
CAUTION:
● Depending on the type of material being cut, the
newly generated cutting dust may be very hot. Be
careful not to touch the cutting dust directly with
your hands.
NOTE:
If too much dust collects in the dust box, the ability
of the tool to collect the dust will drop. Always
empty the dust box before it gets full.
(1) Push on the hook which located in the rear of the
dust box. Open the dust cover and empty out the
cutting dust. (See Fig. 12 and Fig. 13).
Fig. 12
Fig. 13
(2) After you have emptied out the cutting dust, close
the dust cover and put the hook in place.
NOTE:
● Handle the dust box with care. Pounding on the
dust box may damage it.
● When you throw away the cutting dust, make sure
that no dust gets into the part of the tool where
the motor is located.
USING A DUST COLLECTOR
CAUTION:
To avoid serious accident, the switch is in the OFF
position and disconnect the plug from the receptacle.
1. When you attach a dust collector (such as Model
RP30SA, etc.), carefully follow the steps indicated
below:
(1) Remove the rubber cap.
(2) Push the end of the dust collector hose firmly into
the rubber adapter and then insert the rubber adapter
into the hose fitting opening. (See Fig. 14).
Saw blade
Gear cover
C
Dust cover
Dust box
Hook
Dust cover
Hook
D
7
Fig. 14
MAINTENANCE AND INSPECTION
1. Inspecting the saw blade:
Since use of a dull saw blade will degrade efficiency
and cause possible motor malfunction. Resharpen
and 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. 15)
The motor employs carbon brushes which are
consumable parts. Since en 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 they become
worn to or near the “wear limit”. In addition, always
keep carbon brushes clean and ensure that they
slide freely within the brush holders.
Fig. 15
CAUTION
● When replacing the new carbon brushes, always
use genuine Hitachi carbon brushes with the number
(43) specified in Fig. 15.
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) Placing a square against the base of the tool,
determine the angle desired and lightly tighten the
M4 screw. (See Fig. 16).
(2) Turn the angle adjustment screw until the end of
the screw touches the bevel plate. (See Fig. 4)
(3) After all adjustments have been made, firmly tighten
the M4 screw.
Fig. 16
NOTE
Due to HITACHI’s continuing program of research and
development, the specifications herein are subject to
change without prior notice.
Dust box
Dust cover
Hose fitting opening
Rubber
adapter
Rubber cap
M4 screw
17mm
6mm
43
Wear limit
No. of carbon brush
Slotted set
screw
Square
Base
M4 screw
909
Code No. C99067611 N
Printed in Japan
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