Overload Protective Device For Poly-V-Belt; Maintenance And Inspection - Hitachi C10FSH Handling Instructions Manual

English
NOTE
When cutting a single groove at either end of the
workpiece, remove the unneeded portion with a
chisel.
MOUNTING AND DISMOUNTING SAW BLADE
WARNING
To prevent an accident or personal injury, always turn
off the trigger switch and disconnect the power plug
from the receptacle before removing or installing a
blade.
1. Mounting the saw blade (Fig. 20, Fig. 21 and Fig. 22)
(1) Use the accessory 10 mm box wrench to loosen the 6 mm
bolt fastening the spindle cover and then rotate the
spindle cover.
(2) Press in spindle lock and loosen bolt with 10 mm box
wrench.
Since the bolt is left-hand threaded, loosen by turning
it to the right.
NOTE
If the spindle lock cannot be easily pressed in to lock
the spindle, turn the bolt with 10 mm box wrench
while applying pressure on the spindle lock.
The saw blade spindle is locked when the spindle lock
is pressed inward.
(3) Remove the bolt and washer (B).
(4) Lift the lower guard and mount the saw blade.
WARNING
When mounting the saw blade, confirm that the
rotation indicator mark on the saw blade and the
rotation direction of the gear case are properly
matched.
(5) Thoroughly clean washer (B) and the bolt, and install
them onto the saw blade spindle.
(6) Press in the spindle lock and tighten the bolt by turning
it to the left by 10 mm box wrench.
(7) Rotate the spindle cover unitl hook in spindle cover is
in the original position. Then tighten the 6mm bolt.
CAUTION
Confirm that the spindle lock has returned to the
retract position after installing or removing the saw
blade.
Tighten the bolt so it does not come loose during
operation.
Confirm that the bolt has been properly tightened
before the power tool is started.
Confirm that the lower guard has closed position.
2. Dismounting the saw blade
Dismount the saw blade by reversing the mounting
procedures described in paragraph 1 above.
The saw blade can easily be removed after lifting the
lower guard.
CAUTION
Never attempt to install saw blades except
235 mm – 255 mm in diameter.

OVERLOAD PROTECTIVE DEVICE FOR POLY-V-BELT

The power of the motor is transmitted to the saw blade
by a Poly-V-Belt. When the Poly-V-Belt becomes
overloaded, this protective device reduce the input
voltage and the motor is going to stall as result.
However if the over-load is relieved by operator, the
machine recover the running gradually as before in
short time.
47
In this case turn the switch off immediately and raise the
handle to its initial position. Then turn the switch on and
after running the tool for 20 seconds without a load for
cooling of the motor. Then start the cutting operation.
The Poly-V-Belt or the motor will be damaged if the
overload protective device turns off frequently.
CAUTION
When the overload protective device stops the motor,
the motor will start by turning the switch on after
turning it off. When turning the switch on, make sure
that the saw blade is not halfway in the material.

MAINTENANCE AND INSPECTION

WARNING
To avoid an accident or personal injury, always
confirm the trigger switch is turned OFF and that the
power plug has been disconnected from the
receptacle before performing any maintenance or
inspection of this tool.
Report to qualified person as soon as possible, if you
discover the fault of machine including guards or
blade saw.
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.
To avoid excessive noise exposure, use the saw blades
designed to reduce the emitted noise and maintain
saw blade and machine.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws
be loose, re-tighten them immediately. Failure to do
so could result in serious hazard.
3. Inspecting the carbon brushes (Fig. 13)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush could result in motor trouble, replace a carbon
brush with a new one 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.
4. Replacing a carbon brushes
Disassemble the brush cap with a minus-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. Replacement of Poly-V-Belt
The power of the motor is transmitted to the saw blade
by a Poly-V-Belt. When the Poly-V-Belt is broken or
damaged, remove the belt cover by loosening the two
5 mm screws (see Fig. 2) and replace the damaged
one with the new one.
When connecting the belt on pulleys, first connect 2
or 3 teeth of Poly-V-Belt to the grooves of the pulley
(A) and pulley (B). Then turning the pulley (A) and
pulley (B), connect all 10 teeth of the belt to the pulleys.
7. Lubrication
Lubricate the following sliding surfaces once a month
to keep the power tool in good operating condition
for a long time.