Hitachi C 10RA, Technical Data And Service Manual

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8-4. Relation between Saw Blade and Spreader (or Splitter)
The saw thickeness (t
1
), set width (tip width, W) and
spreader (or splitter) thickness (t
2
) are set in the following
relation to prevent dislodging : W>t
2
>t
1
.
The spreader thickness of C 10RA for the U.S.A., Australia
and New Zealand is 2.3 mm. (Fig. 21)
The splitter thickness of C 10RA for Europe is 2.5 mm.
Fig. 21
t
2
=2.3 mm
W
t
1
The spreader or splitter bites into the workpiece kerf like a wedge to prevent the saw blade from being pressed by
the workpiece. Therefore, the spreader or splitter thickness needs to be larger than the saw thickness (t
1
).
However, if the spreader or splitter thickness is larger than the set width (W), a large resistance is applied to the
feeding of the workpiece, making operation impossible.
If a locally available saw blade is used, the above relation cannot be obtained, causing a defect in operation.
Therefore, it is important to advise the user to use only genuine Hitachi saw blades.
8-5. Overload Protective Device
This tool is provided with an overload protective device (thermal relay). If the workpiece feed speed is too fast or
the saw blade is dull, the overload protective device engages to stop power to the motor and protect it. In this
case, allow the motor to cool from 3 to 5 minutes and then press the reset switch to resume operation.
8-6. Precautions on Using the Brake (115 V)
This machine is equipped with a brake to stop the blade's rotation when the switch is turned OFF. When the
switch is turned OFF, the rotation usually stops in 3 to 5 seconds. Should it take more than 15 seconds before
stopping, the machine should not be used. Instruct the customer to contact a Hitachi electric tool dealer for
inspection or repair if this occurs.
(1) Be sure to use the carbon brush designated for this machine (code No. 999044). The use of any other carbon
brush will hinder performance of the brake.
(2) Should the brake fail to function, check the carbon brush. If it wears below 5 mm (3/16") in length, replace it.
If the brake still does not function, it may be necessary to replace the armature ass'y, etc.