Hitachi CR12, Disassembly And Reassembly

MODELS    CR 12V/CR 12

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 1 

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1. NOTES ON DISASSEMBLY AND REASSEMBLY:
The circled numbers in the descriptions below correspond to the item numbers in the Parts Lists and ex-
ploded assembly diagrams.

1-1. Diassembly:
(1) Disassembly of the Upper Cover Ass’y 

11

:

After removing the Base 

1

 and the Saw Blade 

501

, take off the Insulation Cover 

2

 by pulling it

forward (toward the blade mounting end). Then, shift the Plunger 

5

 forward (toward the blade

mounting end) and loosen the four M5 x 16 Machine Screws 

10

 which secure the Upper Cover Ass’y

11

. The Upper Cover A’ssy can then be removed by lifting it upwards.

(2) Disassembly of the Plunger 

5

 from the Upper Cover Ass’y 

11

:

First remove the two M5 x 12 Hexagon Socket Flat Hd. Screws 

15

 which secure the Connector 

14

.

As these are seal lock screws which are secured by an adhesive agent, it may be necessary to heat the
Upper Cover Ass’y 

11

 to a temperature of 100°C - 150°C to permit their removal. The Plunger

5

 can then be removed from the Upper Cover Ass’y 

11

 by pulling it out toward the front (toward

the blade mounting end) .

(3) Disassembly of the Gear Cover 

26

 from the Housing Ass’y 

42

:

Remove the Brush Caps 

39

, and take out the Carbon Brushes 

40

. Next, remove the four D5 x 35

Tapping Screws 

45

. The Gear Cover 

26

 (together with the Armature 

30

 and ralated parts) can then

be removed from the Housing Ass’y 

42

.

(4) Disassembly of the Armature 

30

 from the Gear Cover 

26

:

Remove the three M4 x 12 Machine Screws 

44

. The Armature 

30

 (together with the Bearing Cover

29

) can the be removed from the Gear Cover 

26

.

(5) Disassembly of the Bearing Cover 

29

 from the Armature 

30

:

First, remove the C-Type Retaining Ring 

27

 from the Armature 

30

. Then, as illustrated in Fig.5,

mount the Armature on a J-173 Puller Attachment    (special repair tool, Code No. 970954) , and
secure it in position with the three M4 x 12 Machine Screws 

44

. Next, support the J-173 Puller

Attachment with an appropriate tubular jig (inner diameter of 80 mm or more, outer diameter of
130 mm of less) , and push down on the Pinion end of the Armature with a hand press to loosen and
remove the Armature 

30

 from the Bearing Cover 

29

.

(6) Disassembly of the Gear Ass’y 

21

 and

Spindle 

25

 from the Gear Cover 

26

:

Remove the M6 x 16 Hexagon Socket Flat
Hd. Screw 

18

 which secures the Balance

Weight 

19

, and remove the Balance Weight

from the Gear Cover 

26

. As this screw

is a seal lock screw which is secured by an
adhesive agent, it may be necessary to heat
the Gear Cover 

26

 to a temperature of

100°C - 150°C to permit its removal. Then,
through the hole provided in the Gear Ass’y

21

, remove the three M4 x 12 Flat Hd.

Screws 

22

. The Gear Ass’y 

21

, Bearing

Cover (A) 

23

, 6202VVCM Ball Bearing 

24

and Spindle 

25

 can be taken out of the

Gear Cover 

26

 in a single body. Finally,

push down on the gear-side end of the Spindle
to separate the Spindle 

25

 from the Gear Ass’y 

21

. .

J-173 Puller
Attachment

Tubular Jig

Inner Dia: 80mm or more
Outer Dia: 130mm or less

M4 x 12 Machine Screws 

44

(3 pcs)

Armature 

30

Bearing Cover 

29

Push

Fig. 5