8
SELECTION OF BLADES
To ensure maximum operating e
ffi
ciency and results, it is
very important to select the appropriate blade best suited to
the type and thickness of the material to be cut.
The blade number is engraved in the vicinity of the mounting
portion of each blade. Select appropriate blades by referring
to
Table 3-5
.
Table 3: HCS blades
Blade
No.
Uses
Thickness
(mm)
No. 2
For cutting steel pipe less than 30
mm in diameter
2.5 – 6
No. 3
For cutting steel pipe less than 30
mm in diameter
Below 3.5
No. 4
For cutting and roughing lumber
50 – 70
No. 5
For cutting and roughing lumber
Below 30
No. 8
For cutting vinyl chloride pipe less
than 100 mm in diameter
2.5 – 15
For cutting and roughing lumber
Below 100
No. 9
For cutting mild steel pipe less
than 100 mm in diameter when
used with cut o
ff
guide
2.5 – 6
No. 95 For cutting stainless pipe less than
100 mm in diameter
Below 2.5
No. 96 For cutting stainless pipe less than
30 mm in diameter
Below 2.5
Table 4: Bl-METAL blades
Blade
No.
Uses
Thickness
(mm)
No. 101 For cutting steel and stainless
pipes less than 60 mm in outer
diameter
2.5 – 6
No. 102 For cutting steel and stainless
pipes less than 100 mm in outer
diameter
2.5 – 6
No. 103 For cutting steel and stainless
pipes less than 60 mm in outer
diameter
2.5 – 6
No. 104 For cutting steel and stainless
pipes less than 100 mm in outer
diameter
2.5 – 6
No. 107 For cutting steel and stainless
pipes less than 60 mm in outer
diameter
Below 3.5
No. 108 For cutting steel and stainless
pipes less than 100 mm in outer
diameter
Below 3.5
No. 109 For cutting steel and stainless
pipes less than 60 mm in outer
diameter
2.5 – 6
No. 110 For cutting steel and stainless
pipes less than 100 mm in outer
diameter
2.5 – 6
No. 121 For cutting and roughing lumber
100
No. 131 For cutting and roughing lumber
100
No. 132 For cutting and roughing lumber
100
Table 5: Selection of blades for other materials
Material to
be cut
Material
quality
Thickness
(mm)
Blade No.
Iron plate
Mild steel
plate
2.5 – 10
No. 2, 101,
102, 103, 104,
109, 110, 131
Below 3.5 No. 3, 107,
108
Nonferrous
metal
Aluminium,
Copper and
Brass
5 – 20
No. 2, 101,
102, 103, 104,
109, 110, 131
132
Below 5
No. 3, 107,
108
Synthetic
resin
Phenol resin,
Melamine
resin, etc.
10 – 50
No. 2, 4, 101,
102, 103, 104,
131, 132
5 – 30
No. 3, 5, 8,
107, 108, 109,
110
Vinyl chloride,
Acrylic resin,
etc.
10 – 60
No. 2, 4, 101,
102, 103, 104,
131, 132
5 – 30
No. 3, 5, 8,
107, 108, 109,
110
MAINTENANCE AND INSPECTION
CAUTION
Be sure to turned o
ff
the switch and remove the battery
before maintenance and inspection.
1. Inspecting the blade
Continued use of a dull or damaged blade will result in
reduced cutting e
ffi
ciency and may cause overloading of
the motor. Replace the blade with a new one as soon as
excessive 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. 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.
4. Inspecting the carbon brushes (Fig. 12)
The motor employs carbon brushes which are
consumable parts. Since and excessively worn carbon
brush can result in motor trouble, replace the carbon
brush with new ones 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.
NOTE
When replacing the carbon brush with a new one, be
sure to use the Hitachi Carbon Brush Code No. 999068.
5. Replacing carbon brushes (Fig. 12)
Take out the carbon brush by
fi
rst removing the brush
cap and then hooking the protrusion of the carbon brush
with a
fl
at head screw driver, etc.
When installing the carbon brush, choose the direction
so that the nail
ⓑ
of the carbon brush agrees with the
contact portion
ⓒ
outside the brush tube. Then push it in
with a
fi
nger. Lastly, install the brush cap.
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