Hitachi C 12LSH Manual

TECHNICAL DATA
AND
SERVICE MANUAL
SLIDE COMPOUND MITER SAW
C 12LSH
C 12RSH
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST Nos. C 12LSH: E941
C 12RSH: E942 May 2005
C
MODELS
C 12LSH
C 12RSH
Hitachi 
Power Tools

REMARK:
Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s)
is(are) used in the place of company name(s) and model name(s) of our
competitor(s). The symbol(s) utilized here is(are) as follows:
Symbols Utilized Competitors
Company Name Model Name
MAKITA LS1212
C
DEWALT DW708
P

Page
CONTENTS
1. PRODUCT NAME............................................................................................................................ 1
2. MARKETING OBJECTIVE .............................................................................................................. 1
3. APPLICATIONS............................................................................................................................... 1
4. SELLING POINTS ........................................................................................................................... 2
4-1. Selling Point Descriptions ................................................................................................................ 3
5. SPECIFICATIONS ......................................................................................................................... 12
6. COMPARISONS WITH SIMILAR PRODUCTS ............................................................................. 14
7. PRECAUTIONS IN SALES PROMOTION .................................................................................... 16
7-1. Instruction Manual ..........................................................................................................................16
7-2. Warning Labels, Warning Signs and Caution Labels......................................................................16
7-3. Relative Standards .........................................................................................................................18
7-4. Laser Marker ..................................................................................................................................18
7-5. Ambient Illuminance and Visibility of Laser Line .............................................................................19
7-6. Precautions Concerning Brake (For USA/CAN) ............................................................................19
8. ADJUSTMENT AND OPERATIONAL PRECAUTIONS ................................................................ 20
8-1. Confirmation of Saw Blade Lower Limit Position ............................................................................20
8-2. Confirmation for Use of Sub Fence (A) and Sub Fence (B) ...........................................................21
8-3. Position Adjustment of Laser Line ..................................................................................................22
8-4. How to Use the ViseAssembly .......................................................................................................23
8-5. Adjustment of Table Insert Position.................................................................................................24
8-6. Cutting Operation............................................................................................................................25
8-7. Digital Display Panel (Only Model C 12LSH)..................................................................................32
8-8. Precautions Concerning Electronic Condition ................................................................................33
9. ADJUSTMENT OF COMPONENTS .............................................................................................. 34
9-1. Bevel Angle Adjustment ..................................................................................................................34
9-2. Ball Bushing (Linear Bearing) .........................................................................................................34
10. PACKING ..................................................................................................................................... 35
11. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY.......................................................... 37
11-1. Precautions in Disassembly and Reassembly of the Laser Marker ..............................................37
11-2. Disassembly..................................................................................................................................37
11-3. Reassembly ..................................................................................................................................51
11-4. Wiring Diagram .............................................................................................................................52
11-5. Checking of Insulation Distance....................................................................................................56

11-6. No-load Current..............................................................................................................................56
11-7. Reassembly Requiring Adjustment ................................................................................................56
11-8. Lubrication......................................................................................................................................57
11-9. Product Precision ...........................................................................................................................57
11-10. Adjustment of Laser MarkerAccuracy..........................................................................................58
12. REPAIR GUIDE ............................................................................................................................ 61
13. STANDARD REPAIR TIME (UNIT) SCHEDULES ....................................................................... 67
Assembly Diagram for C 12LSH
Assembly Diagram for C 12RSH
Page

--- 1 ---
1. PRODUCT NAME
Hitachi Slide Compound Miter Saws, Models C 12LSH/C 12RSH
2. MARKETING OBJECTIVE
The new slide compound miter saws Models C 12LSH and C 12RSH are introduced. They are compact thanks to
the new sliding system that allows only the head portion to slide from the front to the back. They are equipped
with the laser marker and the digital display panel that indicates miter/bevel angles (Model C 12LSH only) for
increased visibility. In addition, they incorporate many features such as the turn table and the miter/bevel angle
fine adjustment function. The new Models C 12LSH and C 12RSH are more convenient than the conventional
ones.
3. APPLICATIONS
Cutting various types of wood workpieces
Cutting workpieces of plywood, decoration panels, soft fiberboards and hard boards
Cutting aluminum sashes

--- 2 ---
NOTE: Numerals in ( ) are identical with item numbers in "4-1. Selling Point Descriptions".
(8)
Digital display panel that
indicates miter/bevel angles
(Only the Model C 12LSH)
To left: H70 mm x W312 mm
(H2-3/4" x W12-1/4")
H75 mm x W260 mm
(H2-15/16" x W10-3/16")
To right: H45 mm x W312 mm
(H1-3/4" x W12-1/4")
H50 mm x W260 mm
(H1-15/16" x W10-3/16")
(3)
(2)
(12) Miter cutting
(14)
Press cutting
H107 mm x W107 mm
(H4-3/16" x W4-3/16")
(11)
(13)
(5) High sub fence
(Right and left)
120 mm (4-11/16") in height
(9) Positive angle stoppers
For easy adjustment of the turn table position for miter cutting
(At the right and left of the 0˚center setting,
at 15˚, 22.5˚, 31.6˚and 45˚settings)
High dust collecting
performance
[ Left 45˚, right 57˚]
Right and left bevel cutting
Compound (miter + bevel) cutting
To left: H70 mm x W220 mm (H2-3/4" x W8-5/8")
H75 mm x W180 mm (H2-15/16" x W7-1/16")
To right: H45 mm x W220 mm (H1-3/4" x W8-5/8")
H50 mm x W180 mm (H1-15/16" x W7-1/16")
For easier alignment
with the ink line
Laser marker
(4) Bevel angle fine
adjustment
(7) Conveniently
positioned bevel
angle locking
mechanism
(10) Slide cutting
H107 mm x W312 mm
(H4-3/16" X W12-1/4")
H120 mm x W260 mm
(H4-11/16" X W10-3/16")
Powerful 15 amps motor
(15)
(4) Miter angle fine adjustment
(6) Aggressive tool design
4. SELLING POINTS
Operable even in tight places because
the depth of the main unit is 930 mm.
(1) Compact body thanks to
the new sliding system

--- 3 ---
4-1. Selling Point Descriptions
(1) Compact body thanks to the new sliding system
Operable even in tight places
When moving the motor head, the slide pipe also moves together extending backward in the case of the
conventional slide compound miter saws. The Models C 12LSH and C 12RSH are equipped with the new
system that allows only the motor head to slide from the front to the back. As shown in Fig. 1, the slide pipe
does not extend backward when sliding the motor head from the front to the back. Therefore, the depth of the
main unit remains unchanged (930 mm). The Models C 12LSH and C 12RSH are operable even in tight
places such as a place where there is a wall behind.
1
When the motor head
is at the back position
Dimension of the main unit (Width x Depth x Height)
When the motor head
is at the front position
Depth
Fig. 1
Table 1
Model When the motor head is at the back positionWhen the motor head is at the front position
HITACHI
C 12LSH/C 12RSH
HITACHI
C 12FSA
C
P
595 x 930 x 710
(23-7/16" x 36-5/8" x 27-15/16")
580 x 1,120 x 675
(22-7/8" x 44-3/32" x 29-9/16")
590 x 800 x 690
(23-1/4" x 31-1/2" x 27-1/4")
595 x 910 x 660
(23-7/16" x 35-13/16" x 26")
595 x 930 x 710
(23-7/16" x 36-5/8" x 27-15/16")
580 x 1,120 x 675
(22-7/8" x 44-3/32" x 29-9/16")
590 x 1,035 x 690
(23-1/4" x 40-3/4" x 27-1/4")
595 x 1,120 x 660
(23-7/16" x 44-3/32" x 26")
Depth
The slide pipe does
not extend backward.
Unit: mm (inch)

--- 4 ---
Adjustable sliding amount
The sliding amount of the motor head is adjustable by loosening the slide lock knob at holder (A) side and
changing the slide pipe position (Fig. 2-a). It is convenient for making continuous grooves halfway through the
sliding operation (Fig. 2-b).
2
Slide pipe
Slide lock knob
(Be sure to lock the knob after adjustment.)
Workpiece
Slide
Holder (A)
Adjust
Fig. 2-a Fig. 2-b
(2) Digital display panel that indicates miter/bevel angles
(Only the Model C 12LSH)
Use the digital display panel when cutting a workpiece at
an optional angle. The digital display panel indicates a
miter/bevel cutting angle with a numeric value. There is
no reading error caused by visual check between the
indicator and the scale. The digital display indicates a
miter angle or a bevel angle in increments of 0.5˚. The
digital display is equipped with the convenient back light
ON/OFF switch that makes the display easily readable
even in a dimly lit place (Fig. 3).
Fig. 3
Fig. 4-a
(3) Laser marker
Use the laser marker for aligning with the ink line on the
workpiece.
Cutting position can be properly adjusted by aligning the
positioning ink line with the laser line. There is no need to
make a long ink line on the workpiece.
There is no need to lower the motor head to align with the
ink line because the laser marker makes a laser line on the
workpiece. In addition, cutting position can be easily
adjusted because the operator can hold the workpiece with
both hands to move.
2
Laser
marker

--- 5 ---
A Left 50 (1-15/16")
B Left
C Left 120 (4-11/16")
E Right 45 (1-3/4")
Fig. 4-b Fig. 4-c
Cutting position can be easily adjusted because the laser line can be aligned with an optionally angled ink
line.
Even the workpieces such as crown moldings and base boards that have decorative surfaces and are
difficult to be made an ink line can be cut just by aligning the laser line with the ink line on the fence side.
The laser line is adjusted to the width of the saw blade at the time of factory shipment. Depending upon the
user's cutting choice, the laser line can be aligned with the left side of the cutting width (saw blade) or the
ink line on the right side. Adjust the position of the laser line according to "8-4. Position Adjustment of Laser
Line" on page 23.
3
4
(4) Miter and bevel angle fine adjustment
The Model C 12LSH and C 12RSH are easily and finely adjustable to an optional miter and bevel angle.
Loosen the side handle and turn knob (A) while pulling up the lever to adjust the miter angle finely (Fig. 7).
Loosen the clamp lever and turn knob (B) to adjust the bevel angle finely (Fig. 6).
F
HITACHI
C 12LSH
C 12RSH P
Fixation
fence
High sub
fence
(5) High sub fence
The Models C 12LSH and C 12RSH have a high sub fence (right and left). Use the high sub fence for miter
cutting, left and right bevel cutting or crown molding cutting. The high sub fence supports the workpiece
widely for stable cutting.
Table 2 Unit: mm (inch)
Maker
Model
Height
of fence
Left 120 (4-11/16")
(Rotary type)
D
Right 120 (4-11/16")
(Rotary type)
HITACHI
C 12FSA
Left 49 (1-15/16")
Left
Left 70 (2-3/4")
Right 30.5 (1-3/16")
Left none
Right none
C
Left 45 (1-3/4")
Left 80 (3-3/16")
Left 115 (4-1/2")
Right 30 (1-3/16")
Left 115 (4-1/2")
(Rotary type)
Right none
Left 29 (1-1/8")
Left
Left
Right 29 (1-1/8")
Left 109 (4-5/16")
(Horizontally movable type)
Right 109 (4-5/16")
(Horizontally movable type)

--- 6 ---
Fig. 5-a Fig. 5-b
Fixation fence
High sub fence
High sub fence
Fixation fence
D
C
A
F
E
Left Right
(6) Aggressive tool design
The tool color is gunmetallic silver to give a sturdier image. The circular
saw portion is of a powerful, original and aggressive design.
Fig. 6
(7) Conveniently positioned bevel angle locking mechanism
In the case of the conventional slide compound miter saws, the
clamp lever is positioned at the rear of the main unit. The Models
C 12LSH and C 12RSH are equipped with the clamp lever
conveniently positioned at the upper position for easier bevel angle
locking.
*1: This is a method to cut a workpiece by shaking the motor head.
*2: This is a method to cut a workpiece by sliding the motor head from the front.
The dust collecting performance may vary depending on the workpiece and operating conditions.
The dust collecting performance is obtained from the following formula:
66.6
Maker
Model
Cutting
method
HITACHI
C 12LSH
C 12RSH
Press cutting *1
(Size of the workpiece:
105 mm x 105 mm
(4-1/8" x 4-1/8"))
Table 3 (%)
CP
Slide cutting *2
(Size of the workpiece:
105 mm x 105 mm
(4-1/8" x 4-1/8"))
91.2
8
40.2
84.8 11.0
Weight of sawdust accumulated in the dust bag (g)
Weight of all sawdust during cutting (g) x 100
(8) High dust collecting performance
The dust collecting performance of the Models C 12LSH and C 12RSH are remarkably higher than the other
models thanks to the adoption of new dust guide and gear case.
B
Dust collecting performance (%) =