C
PRODUCT NAME
Hitachi 185 mm (7-1/4”) Circular Saw
Model C 7SB3
Overseas Sales Division
REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1
1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1
• Disassembly ------------------------------------------------------------------------------------------------------ 1
• Reassembly ------------------------------------------------------------------------------------------------------ 6
• Lubrication points and type of lubricant -------------------------------------------------------------------- 8
• Screw tightening torque --------------------------------------------------------------------------------------- 8
• Checking after reassembly ------------------------------------------------------------------------------------- 9
• Wiring diagram ---------------------------------------------------------------------------------------------------10
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------------- 11
CONTENTS
Page
CONFIDENTIAL
Nov. 2017
-1-
• Removal of the TCT saw blade
• Removal of washer (A)
CAUTION: During disassembly and reassembly, and at all other times as well, always exercise
sufficient care in handling to ensure that there is no deviation in the bottom surface
flatness of the base or in its perpendicularity relative to the saw blade.
1. Precautions on disassembly and reassembly
[Bold] numbers in the description below correspond to the item numbers in the parts list and exploded
assembly diagram for the Model C 7SB3.
CAUTION: Prior to disassembly of the circular saw, remove the TCT Saw Blade [12] to protect the saw
blade teeth and yourself.
1. Removal of the TCT saw blade
(1) Gently turn the Hex. Socket Hd. Bolt M8 x 15.5 [14] using the accompanying Hex. Bar Wrench 6 mm
[503] to lock the Spindle and Gear Set [1] while pushing the Lock Lever [23].
(2) After locking the Spindle and Gear Set [1], turn the Hex. Bar Wrench 6 mm [503] counterclockwise to
loosen and remove the Hex. Socket Hd. Bolt M8 x 15.5 [14] and
Washer (B) [13]. Draw the Lever [16]
and insert the Lower Guard [8] into the Gear Cover [26] and then remove the TCT Saw Blade [12].
NOTE: Be careful not to cut your fingers by the saw blade teeth.
(3) Remove Washer (A) [11] from the Spindle and Gear Set [1]. If the Base [67] interferes with removing
Washer (A) [11], loosen the Lever [58] and adjust to shallower cutting depth.
REPAIR GUIDE
Disassembly
Push in
1
[12]
Loosen
[23]
[13]
[14]
3 2
5
[503]
4
Draw
6
[16]
[23]
[12]
[11]
[13]
[14]
[58]
Tighten
Loosen
[67]
-2-
• Removal of the lower guard
• Removal of the lever
[26]
[5]
[6]
2. Removal of the lower guard
(1) Remove the two Seal Lock Flat Hd. Screws M4 x 10 [10], then remove the Bearing Cover [9].
(2) Remove the hook of the Return Spring [7] from the Gear Cover [26] and Lower Guard [8], then remove
the Lower Guard [8], Liner [5] and Washer [6].
3. Removal of the lever
(1) Loosen the Lever [58] and remove the Retaining Ring (E-type) [56].
(2) Remove the Lever [58], Lock Nut [57], Washer [59], and Bolt (Square) M6 [32].
[7]
[8]
[9]
[10]
[56]
[57]
[58]
[59]
[32]
-3-
• Separation of the spindle and gear set from the bearing holder
• Removal of the bearing holder and spindle and gear set
[26]
[3]
[2]
[1]
[1]
[2]
4. Removal of the bearing holder and spindle and gear set
(1) After removing the Lower Guard [8] as described above, loosen the two Seal Lock Flat Hd. Screws M5
x 14 [3].
(2) Remove the Bearing Holder [2] together with the Spindle and Gear Set [1] from the Gear Cover [26].
5. Separation of the spindle and gear set from the bearing holder
(1) Support the Bearing Holder [2] with an appropriate tubular jig.
(2) Push down on the end of the spindle to separate the Spindle and Gear Set [1] from the Bearing Holder
[2].
Push
Tubular jig
60 mm
(2-3/8")
49 mm
(1-15/16")
-4-
• Disassembly of the motor unit
[20]
[23]
[22]
[17]
[18]
[21]
Fan
[42]
[26]
[30]
[43]
[40]
6. Disassembly of the motor unit
(1) Remove the Brush Caps [43] and take out the Carbon Brushes [42].
(2) Loosen the Machine Screws M5 x 50 [38] and separate the Housing Ass'y [40] from the Gear Cover
[26]. If the Armature [22] is remained in the Housing Ass'y [40], gently tap the Housing Ass'y [40] on the
edge of the surface where the Gear Cover [26] is mounted with a wooden or plastic hammer and
remove the Armature [22].
NOTE: Do not hit the fan of the Armature [22].
-5-
• Removal of the handle cover
• Removal of the base
[63]
[26]
[24]
[44]
[55]
[40]
[53]
[52]
[51]
[49]
[48]
[50]
[45]
[54]
[46]
[67]
[38]
[42]
[43]
[24]
7. Removal of the base
Extract the Roll Pin D6 x 50 [63] and remove the Base [67] from the Gear Cover [26].
8. Removal of the handle cover
(1) Loosen and remove the six Tapping Screws D4 x 20 [24].
(2) Remove the Grip Cover [55] and Handle Cover [54].
(3) Remove the Switch [45], Cord [53], etc.
-6-
• Mounting the gear cover
[23]
[22]
[30]
[26]
Protrusion
[49]
[48]
Other than the USA, Canada, and Mexico
For the USA, Canada, and Mexico
[31]
• Mounting the cord clip
Generally, perform reassembly by reversing the disassembly procedure. However, special attention should
be given to the following items. Refer to “Lubrication points and type of lubricant” on page 8 for the grease
required for reassembly.
1. Reassembly of the power supply unit and its vicinity
Perform wiring according to the wiring diagrams shown on page 10 when replacing the Stator Ass'y [20],
Cord [53], Noise Suppressor [35] or Switch [45]. Mount the Cord Clip [48] in the direction shown in the
following figure.
2. Mounting the stator ass'y
Press-fit the Stator Ass'y [20] into the Housing Ass'y [40] so that the internal wire of the Stator Ass'y [20] is
positioned to the opposite side of the name plate on the Housing Ass'y [40]. Refer to the wiring diagrams
on page 10. After press-fitting, hook the Brush Terminal [19] on the Brush Holder [41].
3. Mounting the gear cover
(1) Mount the Rubber Ring [31] into the Gear Cover [26]. Mount the Lock Lever [23] between the fan of the
Armature [22] and Ball Bearing 6001VV [30]. Then carefully mount it into the Gear Cover [26].
NOTE: Check that both ends of the flat spring on the Lock Lever [23] are properly supported
inside the ribs of the Gear Cover [26].
(2) After mounting the Lock Lever [23], check that the Gear Cover [26] is secured to the Housing Ass'y [40]
with the Machine Screws M5 x 50 [38]. Push the Lock Lever [23] by hand and check that it returns to its
original position when released.
Reassembly
Protrusion
[48]
[49]
Rib
Rib
-7-
• Mounting the bearing holder
[26]
The Bearing Holder [2] has a protrusion on either left or right side.
Protrusion
Position of the protrusion
4. Mounting the bearing holder
(1) Mount the Bearing Holder [2] to the Gear Cover [26] positioning the protrusion on either left or right side
of the Bearing Holder [2] downward.
NG
NG
OK
OK
-8-
Apply specified amount of grease to the following portions.
Grease (JF-375)
• Inner hole of the metal of the Gear Cover [26] ························································· About 0.5 g
Grease (SEP-3A)
• Pinion tooth flank of the Armature [22] ··································································· About 1 g
• Gear tooth flank of the Spindle and Gear Set [1] ······················································ About 1 g
• Inside the gear chamber of the Gear Cover [26] ······················································ About 5 g
Prepare the following grease as necessary.
Item Registered part name Net weight Code No.
Grease (SEP-3A)
Grease (SEP-3A) (100 g) 100 g 930035
Grease (SEP-3A) (2.5 kg) 2.5 kg 930038
Location Name of screw or bolt
No.
used
Tightening torque
N•m lbf-ft
Main body
[2] Bearing Holder [3] Seal Lock Flat Hd. Screw M5 x 14 2 2.7 - 4.1 2.0 – 3.0
[12] TCT Saw Blade [14] Hex. Socket Hd. Bolt M8 x 15.5 1 7.8 - 11.8 5.8 – 8.7
[9] Bearing Cover [15] Seal Lock Flat Hd. Screw M4 x 10 2 1.4 - 2.2 1.0 – 1.6
[16] Lever [15] Machine Screw (W/Washers) M4 x 12 (Black) 1 1.4 - 2.2 1.0 – 1.6
[27] Flow Guide (A) [15] Machine Screw (W/Washers) M4 x 12 (Black) 1 0.8 - 1.2 0.6 – 0.9
[25] Flow Guide (B) [24] Tapping Screw (W/Flange) D4 x 20 (Black) 1 1.4 - 2.2 1.0 – 1.6
[26] Handle Cover [24] Tapping Screw (W/Flange) D4 x 20 (Black) 5 1.5 - 2.5 1.1 – 1.84
[44] Cord Holder [24] Tapping Screw (W/Flange) D4 x 20 (Black) 1 1.5 - 2.5 1.1 – 1.84
[28] Cushion [29] Flat Hd. Screw M6 x 20 1 —
*1
—
*1
[40] Housing Ass'y [38] Machine Screw (W/Washers) M5 x 50 (Black) 3 2.7 - 4.1 2.0 – 3.0
[41] Brush Holder [39] Hex. Socket Set Screw M5 x 8 2 0.5 - 1.0 0.4 – 0.74
[42] Carbon Brush [43] Brush Cap 2 0.5 - 1.5 0.4 – 0.74
[45] Switch [46] Tapping Screw (W/Flange) D4 x 12 2 1.5 - 2.5 1.1 – 1.84
Base ass'y
[58] Lever [57] Lock Nut 1 1.4 - 2.0 1.0 – 1.5
[67] Base [60] Seal Lock Screw (W/Sp. Washer) M4 x 14 1 1.4 - 2.2 1.0 – 1.6
[64] Step Pin D6 x 13 [61] Seal Lock Hex. Socket Set Screw M5 x 6 2 2.7 - 4.1 2.0 – 3.0
*1: Tighten the Flat Hd. Screw M6 x 20 [29] until it is flush with the Cushion [28].
Lubrication points and type of lubricant
Screw tightening torque
-9-
• Check the following after reassembly.
(1) Adjust the base ass’y angle to 90°±0.5° with the Slotted Hd. Set Screw M6 x 8 [66].
(2) Check that the base ass’y operates smoothly. (Adjust the cutting depth and tilt angle.)
(3) Check the switch operation.
(4) Check that the Lower Guard [8] moves smoothly and returns within the operating range (maximum to
minimum cutting depth, tilt angle of 0° to maximum angle (45° for Europe and 55° for other countries)
of the base ass’y.
(5) Check the insulation resistance and dielectric strength voltage.
Insulation resistance: 7 MΩ or higher with DC 500 V megohm tester
Dielectric strength: AC 4,000 V/1 minute, with no abnormalities
(6) Check that runout of the saw blade is up to 0.7 mm at 160 mm dia. position.
(7) Check that the direction indicated by the arrow mark on the TCT Saw Blade [12] matches that of the
arrow mark on the Gear Cover [26].
(8) Perform checking according to the handling instructions.
• Cleaning the cover
Clean the exterior of the tool with a soft cloth moistened with soapy water, and dry thoroughly. Do not use
chloric solvent, gasoline, and thinner for cleaning. Otherwise, the plastic components may be melted.
Checking after reassembly
-10-
White
White
Stator coil
Stator coil
Switch
White
Black
Power
source
Armature
White
White
Stator coil
Stator coil
Switch
White
Black
Power
source
Armature
Noise
suppressor
Ferrite core
Noise
suppressor
Ferrite core
Blue
Blue
Stator coil
Stator coil
Switch
Blue
Brown
Power
source
Armature
Connect the wires as illustrated in the diagrams below.
Be sure to connect the wires correctly. If the wires are incorrectly connected, the motor may not turn or
other problems could occur.
Wiring diagram
• Connecting and wiring diagrams for the USA, Canada, and Mexico (120 V)
• Connecting and wiring diagrams for the UK (110 V)
Noise suppressor
• Connecting and wiring diagrams for New Zealand, Australia, and Europe (230-240 V)
Noise suppressor
Ferrite core
Ferrite core
5±1
5±1
5±1
-11-
MODEL
Variable
10 20 30 40 50 60 min.
C 7SB3
General Assembly
Switch
Cord
Cord Armor
Armature
Ball Bearing
6001VV
Ball Bearing
608VV
Bearing
Bushing
Spindle and
Gear Set
Bearing
Holder
Ball Bearing
6003VV
Gear Cover
Housing
Ass'y
Stator Ass'y
Work Flow
Handle Cover
Lower Guard
Return
Spring
Base Ass’y
Bevel Plate
STANDARD REPAIR TIME (UNIT) SCHEDULES
Model C 7SB3
CIRCULAR SAW
LIST NO. E542
(E1)
2017 · 9 · 29
24
45
57
60
61
61
63
64
56
62
64
33
62
64
504
51
5
57
1
2
3
4
6
7
8
16
15
9
10
11
12
13
14
17
35
18
20
21
22
23
24
25
30
31
26
27
15
34
28
29
24
43
42
41
39
40
38
37
46
44
49
48
52
53
54
55
56
56
59
66
65
32
501
502
47
19
50
503
32
68
67
58
58
59
67
32
505
36
PARTS C 7SB3
DESCRIPTION REMARKS
1 372751 SPINDLE AND GEAR SET 1
2 302433 BEARING HOLDER 1
3 992013 SEAL LOCK FLAT HD. SCREW M5 X 14 2
4 6003VV BALL BEARING 6003VVCMPS2L 1
5 998887 LINER 1
6 370591 WASHER 1
7 373011 RETURN SPRING 1
8 372758 LOWER GUARD 1
9 302435 BEARING COVER 1
10 990430 SEAL LOCK FLAT HD. SCREW M4 X 10 2
* 11 320970 WASHER (A) 1
* 11 321639 WASHER (A) 1 FOR AUS,NZL
* 11 324597 WASHER (A) 1 FOR GBR
* 12 TCT SAW BLADE 184MM-D16 HOLE-NT24 1
* 12 372102 TCT SAW BLADE 185MM-D16 HOLE-NT24 1 FOR MEX,PAN
* 12 302411 TCT SAW BLADE 185MM-D20 HOLE-NT18 1 FOR AUS,NZL
* 12 302412 TCT SAW BLADE 185MM-D30 HOLE-NT18 1 FOR GBR
* 13 333555 WASHER (B) 1
* 13 333556 WASHER (B) 1 FOR GBR
14 324662 HEX. SOCKET HD. BOLT M8 X 15.5 1
15 935196
MACHINE SCREW (W/WASHERS) M4 X 12 (BLACK) 2
16 328045 LEVER 1
17 608VVM BALL BEARING 608VVC2PS2L 1
18 982631 WASHER (A) 1
19 930703 BRUSH TERMINAL 2
* 20 340982C STATOR ASS'Y 120V 1 INCLUD.19,36
* 20 340982B
STATOR ASS'Y 110V (W/NOISE SUPPRESSOR) 1 INCLUD.19,35,36
* 20 340982E
STATOR ASS'Y 230-240V (W/NOISE SUPPRESSOR) 1 INCLUD.19,35,36
21 372743 FAN GUIDE 1
* 22 361073U ARMATURE ASS'Y 110V-120V 1 INCLUD.17,18,30
* 22 361073E ARMATURE 230V-240V 1
23 333568 LOCK LEVER 1
24 301653
TAPPING SCREW (W/FLANGE) D4 X 20 (BLACK) 7
25 333570 FLOW GUIDE (B) 1
26 372740 GEAR COVER 1
27 333569 FLOW GUIDE (A) 1
28 337080 CUSHION 1
29 949794 FLAT HD. SCREW M6 X 20 (10 PCS.) 1
30 6001VV BALL BEARING 6001VV 1
31 333566 RUBBER RING 1
32 372747 BOLT (SQUARE) M6 2
* 33 935196
MACHINE SCREW (W/WASHERS) M4 X 12 (BLACK) 1 EXCEPT FOR USA,CAN
* 34 372757 DUST COLLECTOR SET 1
INCLUD.33,505 EXCEPT FOR USA,CAN
* 35 930039 NOISE SUPPRESSOR 1 FOR AUS,NZL,GBR
* 36 930804 TERMINAL M4.0 (10 PCS.) 2
* 36 311741 TERMINAL 2 FOR AUS,NZL,GBR
37 NAME PLATE 1
38 997841
MACHINE SCREW (W/WASHERS) M5 X 50 (BLACK) 3
39 938477 HEX. SOCKET SET SCREW M5 X 8 2
40 372738 HOUSING ASS'Y 1 INCLUD.39,41
- 2 - 9 - 17
*ALTERNATIVE PARTS
ITEM
NO.
NO.
USED
CODE NO. CODE NO.
PARTS C 7SB3
DESCRIPTION REMARKS
41 958900 BRUSH HOLDER 2
42 999043 CARBON BRUSH (1 PAIR) 2
43 945161 BRUSH CAP 2
44 370269 CORD HOLDER 1
45 372781 SWITCH 1
46 305720 TAPPING SCREW (W/FLANGE) D4 X 12 1
* 47 930804 TERMINAL M4.0 (10 PCS.) 2
* 47 980063 TERMINAL 2 FOR AUS,NZL,GBR
48 937631 CORD CLIP 1
49 984750 TAPPING SCREW (W/FLANGE) D4 X 16 2
50 931701 BEARING LOCK 1
* 51 334379 FERRITE CORE 1 FOR AUS,NZL,GBR
* 52 953327 CORD ARMOR D8.8 1
* 52 938051 CORD ARMOR D10.1 1
* 53 500453Z CORD 1 (CORD ARMOR D10.1)
* 53 500439Z CORD 1 (CORD ARMOR D8.8) FOR AUS,NZL
* 53 500435Z CORD 1
(CORD ARMOR D8.8) FOR GBR (230V)
* 53 500463Z CORD 1 (CORD ARMOR D8.8) FOR GBR (110V)
54 372739 HANDLE COVER 1
55 333782 GRIP COVER 1
56 670514 RETAINING RING (E-TYPE) FOR D10 SHAFT 2
57 372746 LOCK NUT 2
58 372745 LEVER 2
59 320975 WASHER 2
* 60 373010
SEAL LOCK SCREW (W/SP. WASHER) M4 X 14 1 FOR GBR
61 319541
SEAL LOCK HEX. SOCKET SET SCREW M5 X 6 2
62 372744 BEVEL PLATE 1
63 949750 ROLL PIN D6 X 50 (10 PCS.) 1
64 320163 STEP PIN D6 X 13 2
65 372754 LINK 1
66 308109
SLOTTED HD. SET SCREW (SEAL LOCK) M6 X 8 1
* 67 372741 BASE 1
* 67 372742 BASE 1 FOR GBR
* 68 372752 BASE ASS'Y 1 INCLUD.32,56-59,61,62,64-67
* 68 372753 BASE ASS'Y 1 INCLUD.32,56-62,64-67 FOR GBR
9 - 17 - 3 -
*ALTERNATIVE PARTS
NO.
USED
CODE NO.
ITEM
NO.
C 7SB3
DESCRIPTION REMARKS
* 501 372756 CASE 1 EXCEPT FOR USA,CAN
* 502 302691 GUIDE 1 EXCEPT FOR USA,CAN
503 872422 HEX. BAR WRENCH 6MM 1
* 504 371108 TOOL BAG 1 FOR USA,CAN
* 505 LEVER 1
EXCEPT FOR USA,CAN (SUPPLIED WITH
ITEM NO.34)
- 4 - Printed in Japan 9 - 17
(170929N)
*ALTERNATIVE PARTS
STANDARD ACCESSORIES
NO.
USED
CODE NO.
ITEM
NO.
/