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

12. REPAIR GUIDE

Item Phenomenon
1 Inaccurate cutting
Inaccurate
• • •
squareness of the cut
surface.
Cut surfaces do not
• • •
fit together properly.
Saw blade
Squareness
Fence (B)
0.15/100
(0.006"/4")
Turn table
Fig. 83
Fence (B)
Squareness
0.15/100
(0.006"/4")
Saw blade
Fig. 84
0.1 (0.004")
Fence (B)
Fence (A)
0.1 (0.004")
Fig. 85
Unit: (mm) The bracketed numbers correspond to the item numbers in the parts list.
Cause (s)
a Inaccurate
squareness between
the turn table and saw
blade causes the saw
blade to cut into the
workpiece at an angle.
b Excessive deflection
of saw blade.
(Excessive vibration)
Fence (A) c Inaccurate
squareness and fence
(B) and saw blade.
Squareness
0.15/100
(0.006"/4")
d Surfaces of fence (A)
and fence (B) are not
accurately aligned,
causing workpiece to
deviate from proper
squareness.
Max.
e Inaccurate surface
flatness of turn table.
f Squareness between
saw blade and turn
Max.
table is lost (changed)
during slide cutting.
Factory
standard
0.15/100
(0.006"/4")
(Dummy disc)
(Fig. 83)
When slide (tip)
0.25/100
(0.1"/4")
(Dummy disc)
0.2/295
(0.008"/11-5/8")
(Dummy disc)
0.15/100
(0.006"/4")
(Fig. 84)
0.15 (0.006") max.
(Fig. 85)
0.15
(0.006")
Max.
Same as a
(Fig. 86)
--- 49 ---
Inspection • Repair •Adjustment
• Adjust squareness with the
Nylock Bolt M8 x 40 [8].
• Adjust the clearance
between the Bushing [73]
and slide pipe (A) with the
Hex. Socket Set Screw
M8 x 16 [71].
• Replace Hinge Ass'y [51], or
Gear Case [140] or Turn
Table [9A] .
• Replace the saw blade.
• Check for surface defects on
Washer (A) [177] and
Washer (B) [179], and
repair with a file as
necessary.
• Replace Washer (A) [177]
and/or Washer (B) [179] as
necessary.
• Loosen the Bolt
(W/Washers) M8 x 35
(Black) [19], and adjust as
necessary.
• Replace Fence (A) [47A]
and Fence (B) [21A] as
necessary.
• Loosen the Bolt
(W/Washers) M8 x 35
(Black) [19] and adjust
surface alignment of Fence
(A) [47A] and fence (B)
[21A] as necessary.
• Replace Fence (A) [47A]
and Fence (B) [21A] as
necessary.
• Replace Turn Table [9A].
• Check precision after press
fitting slide pipe (A) and
slide pipe (B) of Hinge Ass'y
[51]. If precision is poor,
replace them as necessary.
(Fig. 86)
• Adjust the clearance
between the Bushing [73]
and slide pipe (A) with the
Hex. Socket Set Screw
M8 x 16 [71].