The Hitachi CG 30SC Grass Trimmer is a powerful tool designed to make lawn care easier. With a cutting diameter of 300 mm, it can handle even the toughest overgrowth. The trimmer features a 300-watt motor that provides ample power to cut through thick grass and weeds without bogging down. It also has a lightweight design that makes it easy to maneuver, even for extended periods of time.
The Hitachi CG 30SC Grass Trimmer is a powerful tool designed to make lawn care easier. With a cutting diameter of 300 mm, it can handle even the toughest overgrowth. The trimmer features a 300-watt motor that provides ample power to cut through thick grass and weeds without bogging down. It also has a lightweight design that makes it easy to maneuver, even for extended periods of time.
PRODUCT NAME
Hitachi 250 mm Grass Trimmer
Model CG 25SC
Hitachi 300 mm Grass Trimmer
Model CG 30SC
LIST No.
xxx. 2014
REPAIR GUIDE ----------------------------------------------------------------------------------------------------------------- 1
1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------------ 12
CONTENTS
C
CG 25SC
LIST Nos.
CG 25SC:
CG 30SC:
May 2015
Overseas Sales Division
Page
-1-
Fig. 2
Fig. 1
WARNING: Before conducting repair, be sure to turn off the power switch and disconnect the
power cord plug from the power source outlet.
1. Precautions on disassembly and reassembly
[Bold] and <Bold> numbers in the description below correspond to the item numbers in the parts lists and
exploded assembly diagrams of the Models CG 25SC and CG 30SC, respectively.
CAUTION: Be careful not to cut your finger with the Blade [51] located on the back of the
Protecting Cover [50].
1. Disassembling the housing section
(1) Open the Guide [43] wide and detach it from the housing
as shown in Fig. 1.
(2) Pull up the Upper Cover [49] from the Wire Roll Support [41] while pushing in its two latches together.
Remove the Wire Roll [47] with the nylon wire and Spring (D) [46]. Next, remove the Screws ST4 x 12
[10]. Turn the Protecting Cover [50] in the arrow direction as shown in Fig. 2 to remove it.
[41]
[49]
Latch (2 pcs.)
[47]
[49]
[50]
[10]
[46]
Disassembly of the Model CG 25SC
REPAIR GUIDE
[43]
1
1
2
[50]
[10]
[48]
[51]
-2-
Fig. 3
(3) Remove the eight Screws ST4 x 16 [4] from Housing (R) [29] and Housing (L) [35]. Detach the Motor
[39] with the Wire Roll Support [41], Button [32], Lock Pin [33], and Spring (C) [34] as shown in Fig. 3.
(4) Remove the two Screws ST3 x 6 [30] from the Pipe Ass'y [24] to remove the Spacer [31] as shown in
Fig. 3.
2. Removing the motor
(1) Use a hex. bar wrench to turn the Cap [45]
inside the Wire Roll Support [41]. The Cap [45]
comes off together with the M5 Nut [44].
(2) The Wire Roll Support [41] is press-fitted to the
Motor [39]. Use a large bearing puller to remove
it. For easy removal of the support, use the two
side holes of the Wire Roll Support [41] and the
end of the Motor [39] shaft. The Wire Roll
Support [41] is in contact with the ball bearing
of the Motor [39] as shown in Fig. 4.
[4]
[32]
[33]
[34]
[10]
[11]
[38]
[39]
[29]
Fig. 4
[39]
[41]
[44]
[45]
[35]
[30]
[24]
[31]
[40]
-3-
Fig. 6
3. Disassembling the handle section
(1) First, remove the Hanger Ass'y [16] and then
use a flat-blade screwdriver to pry off the
Handle Ring [25].
NOTE: Apply a piece of cloth to the flat
end of the screwdriver to protect
parts.
(2) Remove the six Screws ST4 x 16 [4] from Handle (R) [5] and Handle (L) [13]. Remove the Trigger [8],
Spring (A) [9], Spring (B) [14], and the Lock Off Button [12] as shown in Fig. 6.
(3) Remove the two Screws ST4 x 12 [10] from each of the three Cord Clips [11] to remove the Cord [1]
from the body.
Fig. 5
[1]
[2]
[3]
[8]
[9]
[10]
[11]
[12]
[13]
[11]
[16]
[15]
[24]
[25]
[10]
[14]
[7]
[6]
[5]
[4]
[25]
Apply a piece
of cloth here.
Flat-blade screwdriver
[16]
-4-
Fig. 8
Reverse the disassembly procedure to reassemble the Model CG 25SC. However, pay particular attention
to the following.
1. Notices on reassembly
(1) Press-fit the Wire Roll Support [41] to the Motor [39] until the
Wire Roll Support [41] contacts the ball bearing of the Motor
[39].
NOTE: Do not press-fit with excessive force. Otherwise,
the Wire Roll Support [41] may be broken.
After press-fitting, put the Cap [45] on the M5 Nut [44] and
tighten it to the shaft of the Motor [39].
NOTE: Do not press-fit with excessive force. Otherwise,
the Cap [45] may fall off.
NOTE: The wire roll support of the Model CG 25SC is
similar to that of the Model CG 30SC but they are
not interchangeable (13.5-mm portion is slightly
different in shape.) Do not mismount.
NOTE: Replace the Wire Roll Support [41] with new one
without fail when replacing the Motor [39].
(2) Mount the Lock Off Button [12] and Spring (B) [14] into Handle (L) [13], and then put Handle (L) [13]
and Handle (R) [5] together aligning the position of Spring (B) [14].
NOTE: When putting Handle (R) [5] and Handle (L) [13] together, completely fit the internal
wires into the grooves of the handle ribs so that the internal wires are not pinched by
the handle bodies.
NOTE: The position of the Lock Off Button [12] is predetermined. Fit the protrusion of the Lock
Off Button [12] in the recessed portion of Handle (L) [13].
[13]
[12]
[14]
Fig. 7
[39]
[41]
[44]
[45]
13.5 mm
[11]
[10]
[2]
[1]
[3]
[8]
[9]
[15]
[24]
[10]
[11]
Reassembly of the Model CG 25SC
[7]
-5-
2. Checking after reassembly
(1) Check that the Lock Off Button [12] can be operated normally. Check that the trimmer does not
operate just by pulling the Trigger [8].
(2) Push the Button [32] and check that Housing (R) [29] and Housing (L) [35] can be turned 180° and
locked correctly.
(3) Check the handle portion (Pipe Ass'y [24]) can be smoothly extended and retracted, and firmly locked.
-6-
Fig. 10
Fig. 9
CAUTION: Be careful not to cut your finger with the Blade <46> located on the back of the
Protecting Cover <45>.
1. Disassembling the housing section
(1) Open the Guide <44> wide and detach it from the housing
as shown in Fig. 9.
(2) Pull up the Upper Cover <55> from the Wire Roll Support <49> while pushing in its two latches
together. Remove the Wire Roll <50> with the nylon wire and Spring (D) <54>. Next, remove the four
Screws ST4 x 12 <11>. Turn the Protecting Cover <45> in the arrow direction as shown in Fig. 10 to
remove it.
<49>
<55>
<11>
<54>
<50>
<49>
<55>
<45>
<11>
<45>
<44>
Disassembly of the Model CG 30SC
Latch (2 pcs.)
1
1
2
<46>
-7-
Fig. 11
(3) Remove the eight Screws ST4 x 16 <1> from Housing (R) <43> and Housing (L) <41>. Detach the
Motor <37> with the Wire Roll Support <49>, Button <34>, Lock Pin <35>, and Spring (C) <36> as
shown in Fig. 11.
(4) Remove the two Screws ST3 x 6 <32> from the Pipe Ass'y <22> to remove the Spacer <31> as shown
in Fig. 11.
2. Removing the motor
(1) Use a hex. bar wrench to turn the Cap <53>
inside the Wire Roll Support <49>. The Cap
<53> comes off together with the M5 Nut <52>.
(2) The Wire Roll Support <49> is press-fitted to the
Motor <37>. Use a large bearing puller to
remove it. For easy removal of the support, use
the two side holes of the Wire Roll Support
<49> and the end of the Motor <37> shaft. The
Wire Roll Support <49> is in contact with the
ball bearing of the Motor <37> as shown in Fig.
12.
Fig. 12
<35>
<38>
<1>
<43>
<37>
<34>
<36>
<39>
<11>
<12>
<32>
<31>
<22>
<41>
<37>
<38>
<49>
<52>
<53>
-8-
Fig. 13
3. Disassembling the handle section
(1) Remove the eight Screws ST4 x 16 <1> from Handle (R) <2> and Handle (L) <13>. Remove the
Trigger <6>, Spring (A) <5>, Spring (B) <3>, and the Lock Off Button <4> as shown in Fig. 13.
(2) Remove the two Screws ST4 x 12 <11> from each of the two Cord Clips <12> to remove the Cord
<15> from the body.
<1>
<2>
<3>
<8>
<19>
<16>
<6>
<4>
<5>
<22>
<9>
<10>
<17>
<18>
<20>
<23>
<11> <12>
<13>
<14>
<15>
-9-
Fig. 15
Reverse the disassembly procedure to reassemble the Model CG 30SC. However, pay particular attention
to the following.
1. Notices on reassembly
(1) Press-fit the Wire Roll Support <49> to the Motor <37> until
the Wire Roll Support <49> contacts the ball bearing of the
Motor <37>.
NOTE: Do not press-fit with excessive force. Otherwise,
the Wire Roll Support <49> may be broken.
After press-fitting, put the Cap <53> on the M5 Nut <52> and
tighten it to the shaft of the Motor <37>.
NOTE: Do not press-fit with excessive force. Otherwise,
the Cap <53> may fall off.
NOTE: The wire roll support of the Model CG 30SC is
similar to that of the Model CG 25SC but they are
not interchangeable (5-mm portion is slightly
different in shape.) Do not mismount.
NOTE: Replace the Wire Roll Support <49> with new one
without fail when replacing the Motor <37>.
(2) Mount the Lock Off Button <4> and Spring (B) <3> into Handle (L) <13>, and then put Handle (L) <13>
and Handle (R) <2> together aligning the position of Spring (B) <3>.
NOTE: When putting Handle (R) <2> and Handle (L) <13> together, completely fit the internal
wires into the grooves of the handle ribs so that the internal wires are not pinched by
the handle bodies.
NOTE: The position of the Lock Off Button <4> is predetermined. Fit the protrusion of the Lock
Off Button <4> in the recessed portion of Handle (L) <13>.
Fig. 14
<37>
<38>
<49>
<52>
<53>
5 mm
Reassembly of the Model CG 30SC
<13>
<4>
<3>
<5>
<6>
<16>
<15>
<14>
<12>
<11>
<7>
<22>
<20>
-10-
2. Checking after reassembly
(1) Check that the Lock Off Button <4> can be operated normally. Check that the trimmer does not operate
just by pulling the Trigger <6>.
(2) Push the Button <34> and check that Housing (R) <43> and Housing (L) <41> can be turned 180° and
locked correctly.
(3) Check the handle portion (Pipe Ass'y <22>) can be smoothly extended and retracted, and firmly
locked.
• Tapping Screw ST3 x 6 [30]<32> ----------------------------------------------- 0.4 to 0.6 N
•m (4 to 5 kgf•cm)
• Tapping Screw ST4 [4][10]<1><11> ------------------------------------------- 1.1 to 1.3 N
•m (11 to 13 kgf•cm)
• M5 Nut [44]<52> -------------------------------------------------------------------- 2.0 to 3.0 N
•m (20 to 30 kgf•cm)
Upon completing disassembly and repair, measure the insulation resistance and conduct an insulation test
(dielectric strength test).
Insulation resistance: 7 Mȍ or more
Dielectric strength: 4,000 VAC for 1 minute, with no abnormalities
After no-load operation for five minutes, the no-load current value at a frequency of 50 Hz should be as
follows:
Model CG 25SC: 2.2 A (max.)
Model CG 30SC: 2.3 A (max.)
Screw tightening torque
Insulation test
No-load current
-11-
• Model CG 25SC
NOTE:
*1: The color of the internal wire may be red or blue depending on the shipping conditions.
*2: Either the black or white internal wire can be connected.
• Model CG 30SC
NOTE:
*1: The color of the internal wire may be red or blue depending on the shipping conditions.
*2: Either the black or white internal wire can be connected.
Wiring diagram
Black
Red or blue
*1
Blue
Black or white
*2
Brown
Red or blue
*1
Black
Switch
Capacitor
Cord
Black or white
*2
Switch
Black or white
*2
Black or white
*2
Blue Red or blue
*1
Black
Black
Red or blue
*1
Brown
Capacitor Cord
NO
COM
NO
COM
-12-
MODEL
Variable
Fixed
10 20 30 40 50 60 min.
CG 25SC
CG 30SC
General assembly
Handle (R)
Handle (L)
Housing (R)
Housing (L)
Motor
Wire Roll
Support
Pipe Ass’y
Curl Cord
Work Flow
Cord
Cord Armor
Trigger
Lock Off
Button
Switch
Spacer
Button
Lock Pin
STANDARD REPAIR TIME (UNIT) SCHEDULES
GRASS 75,00(5
Model CG 25SC
2015 · 3 · 10
18
39
1
2
3
6
4
5
7
8
9
4
4
10
10
10
10
10
11
12
11
11
13
14
15
16
22
21
20
23
19
17
25
26
24
27
28
29
30
31
32
33
34
35
36
37
38
40
41
42
43
44
45
46
47
49
50
51
52
42
30
501
503
504
53
54
55
55
54
56
PART
S
CG 25SC
DESCRIPTION REMARKS
* 1 337955 Cord (Europe) 1
* 1 338320 Cord (Swiss) 1
2 337956 Cord Armor 1
3 337957 Terminal Block 1
4 337992 Tapping Screw ST4 X 16 (5 pcs.) 18
5 337954 Handle (R) 1
6 337959 Ferrite Core (A) 1
7 337958 Capacitance 1
8 337960 Trigger 1
9 337961 Spring (A) 1
10 337962 Tapping Screw ST4 X 12 (5 pcs.) 9
11 337963 Cord Clip 3
12 337964 Lock Off Button 1
13 337967 Handle (L) 1
14 337965 Spring (B) 1
15 337966 Switch (230V) 1
16 6696493 Hanger Ass'y 1
17 338000 Sub Handle (B) 1
18 338449 rubber stoper 1
19 337999 M6 Nut 1
20 337997 Sleeve 1
21 337996 Knob 1
22 337995 M6 X 55 Bolt 1
23 337998 Sub Handle (A) 1
24 337968 Pipe Ass'y 1
25 337994 Handle Ring 1
26 337969 Curl Cord 1
27 337991 Board (R) 1
28 Name Plate 1
29 337993 Housing (R) 1
30 337970 Tapping Screw ST3 X 6 (5 pcs.) 2
31 337972 Spacer 1
32 337973 Button 1
33 337974 Lock Pin 1
34 337975 Spring (C) 1
35 337977 Housing (L) 1
36 337978 Board (L) 1
37 Hitachi Label 1
38 337976 Ferrite Core (B) 1
39 337979 Motor (CG25SC) (230V) 1
40 338021 Sponge Pad 1
41 337980 Wire Roll Support (25) 1
42 337981 Collar 2
43 337982 Guide (25) 1
44 337983 M5 Nut 1
45 337984 Cap 1
46 337985 Spring (D) 1
47 337986 Wire Roll 1
49 337987 Upper Cover 1
50 337988 Protecting Cover 1
- 2 - 3 - 15 *ALTERNATIVE PARTS
ITEM
NO.
NO.
USED
CODE NO.
PART
S
CG 25SC
DESCRIPTION REMARKS
51 337990 Blade 1
52 337989 Blade Cover 1
53 338006 Terminal (A) 2
54 338450 Terminal (C)
4
55 338017 Heat Shrinkable Tube (B) 1 60mm in length, 3mm in dia. (15mm X 4 pcs.)
56 Caution Label 1
STANDARD ACCESSORIES
DESCRIPTION REMARKS
501 338001 Protective Glasses 1
503 338003 Nylon Wire (1.65mm dia. X 15m) 1
504 338002 Belt 1
3 - 15 Printed in Japan - 3 -
(150310N)
*ALTERNATIVE PARTS
NO.
USED
CODE NO.
ITEM
NO.
NO.
USED
CODE NO.
ITEM
NO.
CODE NO.
GRASS 75,00(5
Model CG 30SC
2015 · 3 · 10
25
1
30
29
28
27
26
24
1
2
3
4
16
5
6
18
9
10
20
18
11
12
13
14
15
17
7
21
23
31
32
33
1
34
35
36
11
12
42
10
40
7
37
38
44
45
46
47
48
49
52
53
54
50
55
19
11
11
41
43
39
22
501
503
504
10
8
PART
S
CG 30SC
DESCRIPTION REMARKS
1 337992 Tapping Screw ST4 X 16 (5 pcs.) 20
2 338012 Handle (R) 1
3 338013 Spring (B) 1
4 338011 Lock Off Button 1
5 338010 Spring (A) 1
6 338009 Trigger 1
7 338017 Heat Shrinkable Tube (B)
1 60mm in length, 3mm in dia. (15mm X 4 pcs.)
8 338015 Heat Shrinkable Tube (A) 1 60mm in length, 3mm in dia. (15mm X 4 pcs.)
9 338007 Internal Wire (A) 1
10 338006 Terminal (A)
1 20mm in length (3mm X 6 pcs.)
11 337962 Tapping Screw ST4 X 12 (5 pcs.) 10
12 337963 Cord Clip 2
13 338004 Handle (L) 1
14 337956 Cord Armor 1
* 15 338025 Cord (Europe) 1
* 15 338485 Cord (Swiss) 1
16 338014 Switch 1
17 337976 Ferrite Core (B) 1
18 338016 Terminal (B) 4
19 338008 Internal Wire (B) 1
20 338005 Terminal Block 1
21 337969 Curl Cord 1
22 337968 Pipe Ass'y 1
23 6696493 Hanger Ass'y 1
24 338000 Sub Handle (B) 1
25 338449 rubber stoper 1
26 337999 M6 Nut 1
27 337998 Sub Handle (A) 1
28 337997 Sleeve 1
29 337996 Knob 1
30 337995 M6 X 55 Bolt 1
31 337972 Spacer 1
32 337970 Tapping Screw ST3 X 6 (5 pcs.) 2
33 Name Plate 1
34 337973 Button 1
35 337974 Lock Pin 1
36 338494 Spring (C) 1
37 338020 Motor (CG30SC) (230V) 1
38 338021 Sponge Pad 1
39 338019 Capacitance 1
40 Caution Label 1
41 338022 Housing (L) 1
42 Hitachi Label 1
43 338018 Housing (R) 1
44 338451 Guide (30) 1
45 338023 Protecting Cover 1
46 338024 Blade 1
47 337989 Blade Cover 1
48 337981 Collar 2
49 338322 Wire Roll Support (30) 1
- 2 - 3 - 15 *ALTERNATIVE PARTS
ITEM
NO.
NO.
USED
CODE NO.
PART
S
CG 30SC
DESCRIPTION REMARKS
50 337986 Wire Roll 1
52 337983 M5 Nut 1
53 337984 Cap 1
54 337985 Spring (D) 1
55 337987 Upper Cover 1
STANDARD ACCESSORIES
DESCRIPTION REMARKS
501 338001 Protective Glasses 1
503 338003 Nylon Wire (1.65mm dia. X 15m) 1
504 338002 Belt 1
3 - 15 Printed in Japan - 3 -
(150310N)
*ALTERNATIVE PARTS
NO.
USED
CODE NO.
ITEM
NO.
NO.
USED
CODE NO.
ITEM
NO.
CODE NO.
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
Hitachi CG 30SC User manual
- Type
- User manual
- This manual is also suitable for
The Hitachi CG 30SC Grass Trimmer is a powerful tool designed to make lawn care easier. With a cutting diameter of 300 mm, it can handle even the toughest overgrowth. The trimmer features a 300-watt motor that provides ample power to cut through thick grass and weeds without bogging down. It also has a lightweight design that makes it easy to maneuver, even for extended periods of time.
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