Hitachi C 6MFA Manual

TECHNICAL DATA
AND
SERVICE MANUAL
CIRCULAR SAWS
C 6MFA
C 7MFA
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST Nos. C 6MFA: E502
C 7MFA: E503 Jan. 2005
C
MODELS
C 6MFA
C 7MFA
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
BOSCH GBM13-2RE
B
For Models D 13VB3 and D 13VH
Symbols Utilized Competitors
Company Name Model Name
BOSCH GBM10-2RE
B
For Model D 10VJ

Page
CONTENTS
1. PRODUCT NAME........................................................................................................................... 1
2. MARKETING OBJECTIVE ............................................................................................................. 1
3. APPLICATIONS.............................................................................................................................. 1
4. SELLING POINTS .......................................................................................................................... 1
4-1. Selling Point Descriptions ............................................................................................................... 2
5. SPECIFICATIONS .......................................................................................................................... 3
6. COMPARISONS WITH SIMILAR PRODUCTS .............................................................................. 4
7. PRECAUTIONS IN SALES PROMOTION ..................................................................................... 4
7-1. Handling Instructions ...................................................................................................................... 4
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ............................................................ 5
8-1. Disassembly ................................................................................................................................... 5
8-2. Reassembly .................................................................................................................................... 8
8-3. Insulation Tests ..............................................................................................................................11
8-4. Deflection of Saw Blade.................................................................................................................11
8-5. Cleaning the Case .........................................................................................................................11
9. STANDARD REPAIR TIME (UNIT) SCHEDULES ....................................................................... 12
Assembly Diagram for C 6MFA
Assembly Diagram for C 7MFA

--- 1 ---
1. PRODUCT NAME
Hitachi Circular Saw, Model C 6MFA [165 mm (6-1/2")]
Hitachi Circular Saw, Model C 7MFA [190 mm (7-1/2")]
2. MARKETING OBJECTIVE
Circular saw market in the European countries are mainly demanding the heavy-duty machines for professionals.
However, potential demands for reasonably priced and light-duty machines are seemed to be strong. We will
expand selling the circular saws with reasonable price and high performance for European countries to find a new
market. The key features are as follows:
(1) Provided with parallel adjustment system
(2) Adopting base made of aluminum which is strong and precise
(3) Reasonable price
3. APPLICATIONS
Cutting of various wood materials
4. SELLING POINTS
C 7MFA
40T TCT saw blade
(C 6MFA: 165 mm dia.)
(C 7MFA: 190 mm dia.)
Provided with parallel adjustment
Accurate and sturdy
aluminum die-cast base
Double-insulated construction

--- 2 ---
4-1. Selling Point Descriptions
(1) Parallel adjustment system
The parallelism can be easily fine-adjusted by using the parallel adjustment system. The parallelism may be
slightly shifted when the cutting depth is adjusted. If the parallelism is shifted, adjust it according to the
following procedure.
(a) Loosen the locking screw of the saw cover hinge (Fig. 1).
(b) Draw the protective cover in the saw cover.
(c) Hold a piece of wood to the rear of the base and put a mark on the piece of wood at the side of the base
(Fig. 2).
(d) Move the marked piece of wood to the front of the base and turn the parallel adjustment screw until the
mark aligns with the side of the base (Fig. 3).
(e) After adjustment, tighten the locking screw securely.
(2) Accurate and sturdy aluminum die-cast base
Thanks to the sturdy aluminum die-cast base, the Models C 6MFA/C 7MFA can cut workpieces accurately and
the cut surfaces of the workpieces are smooth.
(3) High performance 40-tooth tungsten carbide tipped (TCT) saw blade as standard
High performance TCT saw blade (40 teeth) is provided as standard instead of the conventional combination
blade. The Models C 6MFA and C 7MFA provide greater maximum cutting depth than the conventional
models by using a 165 mm dia. TCT saw blade and a 190 mm dia. TCT saw blade respectively.
(4) Double-insulated construction
Grounding is not required thanks to the double-insulated construction.
Fig. 1 Fig. 2 Fig. 3
Saw cover
Mark
Parallel
adjustment
screw
Lower guard
Mark

--- 3 ---
Housing
Handle cover
Gear cover
Lower guard
Base
Polycarbonate resin
Standard equipment Tungsten carbide tipped (TCT) saw blade •••••••••••••••••••••••••••••••••••••••••• 1
Box wrench •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Parallel guide ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Hex. bar wrench ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Type of motor
Enclosure
Weight
AC single phase 50/60 Hz
Cutting depth at 90˚
Cast aluminum
Power source
Power input
at 45˚
* Voltage (V)
* Current (A)
Rotation speed
Cord
No-load
Gross
Net
Full-load
Type
Overall length
5,450/min.
1,010 W
3,550/min.
2.5 m (8.2 ft.)
110
9.6
5. SPECIFICATIONS
165 mm (6-1/2")
Two-core cabtire cable
Model
Saw blade diameter
C 6MFA
0 to 57 mm (0 to 2-1/4")
C 7MFA
AC single phase commutator
Packaging Corrugated cardboard box
190 mm (7-1/2")
0 to 68 mm (0 to 2-11/16")
Max. 38 mm (1-1/2") Max. 46 mm (1-13/16")
Type of switch Trigger switch
240
4.4
5,800/min.
3,780/min.
3.4 kg (7.5 lbs) 3.6 kg (7.9 lbs)
4.5 kg (9.9 lbs) 4.9 kg (10.8 lbs)
230
4.6
5,950/min.
4,190/min.
* Check the tool name plate to confirm the rating, as it is subjected to change by area.

--- 4 ---
Provided
Aluminum
Aluminum
None
291
242
210
190 (7-1/2")
C 7MFA
291
544
1,010
86
5,950
68 (2-11/16")
46 (1-13/16")
5,500
3.6 (7.9 lbs)
4,190
1,580
Provided
Aluminum
Aluminum
None
276
230
210
165 (6-1/2")
C 6MFA
276
544
1,010
86
5,950
57 (2-1/4")
38 (1-1/2")
5,500
3.4 (7.5 lbs)
4,190
1,580
None
Aluminum
Aluminum
Provided
294
240
215
6. COMPARISONS WITH SIMILAR PRODUCTS
Material of base
Max. cutting
depth 90˚
Saw blade diameter
Parallel adjustment
45˚
Full-load output
Max. output
Material of lower guard
Riving knife
Maker •Model
mm
No-load noise
No-load rotation speed
Full-load rotation speed
/min.
HITACHI
Catalog
Characteristic
mm
kg
W
Weight
dB
W
Power input
Overall length
No-load rotation speed /min.
/min.
mm
W
Structure
W
H
Lmm
mm
mm
None
Aluminum
Aluminum
Provided
272
228
208
165 (6-1/2")
C 6U
272
600
1,010
86
4,810
55 (2-5/32")
40 (1-9/16")
5,000
3.5 (7.7 lbs)
3,350
1,440
185 (7-1/4")
C 7U
294
710
1,150
88
4,940
65 (2-9/16")
47 (1-27/32")
5,000
4.0 (8.8 lbs)
3,730
1,600
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Models C 6MFA and C 7MFA Circular Saws by
all of our customers, it is very important that at the time of sale the salesperson carefully ensures that the buyer
seriously recognizes the importance of the contents of the Handling Instructions.
7-1. Handling Instructions
Although every effort is made in each step of design, manufacture, and inspection to provide protection against
safety hazards, the dangers inherent in the use of any electric tool cannot be completely eliminated. Accordingly,
general precautions and suggestions for the use of electric power tools, and specific precautions and suggestions
for the use of the circular saw are listed in the Handling Instructions to enhance the safe and efficient use of the
tool by the customer. Salespersons must be thoroughly familiar with the contents of the Handling Instructions to
be able to offer appropriate guidance to the customer during sales promotion.
* The above figure is based on the 230 V motor.

--- 5 ---
8-1. Disassembly
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
The procedures for disassembly and reassembly and certain precautions are described below.
The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List for all the models.
In disassembly or reassembly and also in other work, the Base Ass'y [63] should be carefully handled to prevent
the loss of the accuracy of each part, such as the flatness of the bottom surface.
Fig. 4
(3) Removing the Spindle and Gear Set [2] (See Fig. 4.)
Hold the Bearing Holder [3] in a cylindrical jig with an inside
diameter of 42 mm to 43 mm (approx. 1-23/32"), and remove
it by pushing the end of the Spindle and Gear Set [2].
Important: A gear, once removed, cannot be used again
because it no longer engages. It must be
replaced by a new Spindle and Gear Set [2].
(4) Removing the Housing Ass'y [20]
(a) Loosen the Brush Caps [42] with a flat-blade screwdriver
and remove the Carbon Brushes [41].
(b) Loosen the Machine Screws (W/Washers) M5 x 45 (Black)
[17] securing the Housing Ass'y [20], and remove the
Housing Ass'y [20] and Gear Cover Ass'y [35].
(1) Removing the Lower Guard [6]
(a) Detach the hook of the Return Spring [7] from the Lower Guard [6].
(b) Loosen the Seal Lock Flat Hd. Screw M3 x 12 [10] securing the Bearing Cover [9], and remove the
Bearing Cover [9] and the Lower Guard [6].
(2) Removing the Bearing Holder [3]
Loosen the Seal Lock Flat Hd. Screw M5 x 12 [4], remove the Bearing Holder [3] together with the Spindle
and Gear Set [2].
Before disassembly, be sure to remove the saw blade to prevent damage to the cutting edge or
injuries by the saw blade.
[2] [3]

--- 6 ---
(5) Removing the Armature [29] (See Fig. 5.)
(a) Remove the Lock Lever [48] and tap the end surface of the Housing Ass'y [20] with a wooden hammer.
The Armature [29] and the Fan Guide [28] can then be removed.
(b) Remove the Fan Guide [28], Thrust Washer [22] and Bearing Lock [21].
(c) Remove the Ball Bearing 6000VVCMPS2L [49] and Ball Bearing 608VVC2PS2L [23] with a bearing puller,
and remove Washer (A) [24].
Fig. 5
Fig. 6
(6) Removing the Stator Ass'y [27] (See Fig. 6.)
(a) Loosen the two Hex. Hd. Tapping Screws D5 x 55 [47].
(b) Remove the two Brush Terminals [25] from the brush holders of the Housing Ass'y [20].
(c) Lightly tap the end surface of the Housing Ass'y [20] with a wooden hammer to remove the Stator Ass'y
[27].
[21]
[24]
[28] [29]
[48] [49]
[23]
[22]
[20]
[47]
[25]
[27]

--- 7 ---
(7) Removing the Base Ass'y [63] (See Fig. 7.)
(a) Loosen the Seal Lock Screw (W/Sp. Washers) M6 x 14 [65], then remove Lever (A) [66], Lock Nut [67],
Washer [68] and Bolt (Square) M6 x 20 [53].
(b) Loosen the two Hex. Socket Set Screw M5 x 6 [34] of the Gear Cover Ass'y [35] and the hex. socket screw
in the Sleeve [58] to remove the Sleeve [58].
(c) Loosen Adjusting Screw (A) [64] and remove it from the Gear CoverAss'y [35]. Then the Base Ass'y [63]
can be removed.
Fig. 7
[58]
[68]
[66]
[65]
[35]
[34]
[64]
[63]
[53]
[67]