Repair Guide - Hitachi C 10RA Technical Data And Service Manual

11. REPAIR GUIDE

No. Problem
Low cutting accuracy
1
--- poor squareness of
cut surface
Saw blade
Squareness
Table
0.4/60
mm
(Note) Unit:
Fig. 40
Saw blade
Parallelism
1.0/200
Table
Rip fence
mm
(Note) Unit:
Fig. 41
Possible cause
a) Because of poor
squareness between
the table and saw
blade, the saw blade
enters the material at
a slant.
b) Large run out of saw
blade.
(Large vibration)
/
mm
c) Poor parallelism of
table upper surface.
d) Poor parallelism
between the table and
the extension wing.
e) Poor parallelism
between the miter-
gauge groove and
saw blade.
f) Poor parallelism
between the rip fence
and saw blade.
g) A too fast cutting
/
mm
speed causes the saw
blade to deflect and
results in low
accuracy.
h) Excessive force is
applied because of a
dull saw blade.
i ) Deformation of the
material such as a
curvature or bend
causes the material to
move during cutting.
Factory rated
value
0.4/60
(Dummy disc)
(Fig. 40)
0.38/230
(Dummy disc)
1.0 /200
or under
1.5/200
or under
0.4/200
(Dummy disc)
1.0/200
(Dummy disc)
(Fig. 41)
------
------
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--- 37 ---
Remedy
• Readjust the squareness of the
saw blade using the M6 x 20
Seal Lock Screw [27].
• Replace the Saw Blade [704].
• Check Washer (A) [75] for
dents, etc. If any, remove with
a file.
• Replace Washer (A) [75].
• Replace Table [33].
• Loosen the M8 x 20 Bolt (W/
Washers) [107], and readjust
the parallelism between the
Table [33], and Extension Wing
(R) [35] and Extension Wing
(L) [29].
• Replace Extension Wing (R)
[35] or Extension Wing (L) [29].
• Loosen the M6 x 25 Flat Hd.
Screw [26], and readjust the
parallelism between the miter-
gauge groove and the saw
blade.
• Loosen the M6 x 12 Bolt [43],
and readjust the parallelism
between the rip fence and the
saw blade.
• Slow down the cutting speed.
(Proper speed is 7 seconds for
50 mm rectangular lumber.)
• Sharpen the Saw Blade [704].
• Replace the Saw Blade [704].
• Correct the curvature or bend
by planing the material, and cut
again.