Hitachi CG 25SC User manual

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>