Repair Guide - Hitachi C 12LCH Technical Data And Service Manual

12. REPAIR GUIDE

Item Phenomenon
Inaccurate cutting
1
Inaccurate
• • •
squareness of the
cut surface
Cut surfaces do not
• • •
fit together properly.
Fig. 55
Fig. 56
Fig. 57
Cause
a Inaccurate
squareness between
the turn table and the
saw blade causes the
saw blade to cut into
the workpiece at an
angle.
b Excessive deflection
of the saw blade
(Excessive vibration)
c Inaccurate
squareness between
the fence and the saw
blade
d Inaccurate surface
flatness of the fence
causes workpiece to
move irregularly,
causing poor
squareness of cut
surface.
e Loose fitting of
swiveling portion of
the hinge and the
gear case or sluggish
movement. As a
result, components
may be deformed
because of unstable
gear case or because
the operator applies
excessive pressure
during operation.
f The workpiece moves
during cutting
because it is bent or
deformed.
--- 47 ---
Factory
standard
• Adjust squareness with the
0.2/100
Nylock Bolt M8 x 25 [65].
(Dummy disc)
(Fig. 55)
• Replace the Hinge [30A],
Gear Case [208] or the Turn
Table [107] (if deformed).
• Replace the TCT Saw Blade
0.2/280
305 mm-D25.4 Hole-NT32
(Dummy disc)
[193].
• Check Washers (A) [194] and
(B) [192] for dents, and
replace them if dented.
• Loosen the Bolt M8 x 35
0.2/100
[149] and adjust the
(Fig. 56)
squareness.
• Replace Fence (A) [165] or
Fence (B) [152].
• Loosen the Bolt M8 x 35
0.2 or less
[149] and adjust the
(Fig. 57)
squareness.
• Replace Fence (A) [165] or
Fence (B) [152].
------ • Check the fitting surfaces of
the Hinge [30A], Gear Case
[208] and Shaft (C) [29] for
any foreign substances
(such as cutting dust), and
remove it as necessary.
------ • Correct bend, flex or other
deformation by planing and
try cutting.
Unit: mm
Inspection, repair or
adjustment