Repair Guide - Hitachi C 12LDH 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.
Fence (A)
Fig. 66
Fig. 67
Fig. 68
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)
Fence (B)
c Inaccurate
squareness between
the fence (A), fence
(B) and the saw blade
d Inaccurate surface
flatness of the fence
(A) and fence (B)
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.
Factory
standard
0.2/100
(Dummy disc)
(Fig. 66)
0.2/280
(Dummy disc)
0.2/100
(Fig. 67)
0.2 or less
(Fig. 68)
------
------
--- 46 ---
Unit: mm
Inspection, repair or
adjustment
• Adjust squareness with the
Nylock Hex. Socket Hd. Bolt
M8 x 20 [69].
• Replace the Hinge Ass'y [43],
Gear Case [246] or the Turn
Table Ass'y [108] (if
deformed).
• Replace the TCT Saw Blade
305 mm-D25.4 Hole-NT32
[250].
• Check Washers (A) [251] and
(B) [249] for dents, and
replace them if dented.
• Loosen the Bolt M8 x 35
[142] and adjust the
squareness.
• Replace Fence (A) [172] or
Fence (B) [150].
• Loosen the Bolt M8 x 35
[142] and adjust the
squareness.
• Replace Fence (A) [172] or
Fence (B) [150].
• Check the fitting surfaces of
the Hinge Ass'y [43], Gear
Case [246] and Shaft (B)
[168] for any foreign
substances (such as cutting
dust), and remove it as
necessary.
• Correct bend, flex or other
deformation by planing and
try cutting.