Hitachi G 12SA3, Technical Data And Service Manual

Page: 11 / 26

--- 8 ---
(2) Disassembly of the dust seal
1. Insert the hooks of the J-204 bearing puller between the commutator and the Dust Seal [16] <16> from both
sides, and fix the hooks with the wing bolts.
2. Place the J-204 bearing puller on a supporting jig and push down on the armature shaft with a hand press to
remove the Dust Seal [16] <16> together with the Ball Bearing 608VVC2PS2L [17] <17> . Replace the Dust
Seal [16] <16> with new one because it is damaged by the removal of the Ball Bearing 608VVC2PS2L [17]
<17> .
(3) Disassembly of the stator
1. After removing the Armature [12] <12> and the Pushing Button Switch [39] <45> , disconnect the lead wires
connected to the Brush Holders [43] <49> .
2. Loosen the two Hex. Hd. Tapping Screws D4 x 70 [14] <14> and remove the Stator [15] <15> from the
Housing [37] <43> . If the Stator [15] <15> cannot be easily removed from the Housing [37] <43> ,
disassembly can be facilitated by heating the Housing [37] <43> to a temperature of approximately 60 û C
(140 û F) with an appropriate heating device.
(4) Disassembly of the gear (Fig. 6)
1. Loosen the four Seal Lock Screws (W/Sp. Washer) M5 x 16 [26] <26> fixing the Packing Gland [25] <25> ,
and remove the Packing Gland [25] <25> from the Gear Cover Ass'y [4] <4> .
2. Support the bottom of the Packing Gland [25] <25> with a jig, and push down on the upper portion of the
Spindle [28] <28> with a hand press until the end surface of the Feather Key 3 x 3 x 8 [27] <27> contacts the
Ball Bearing 6201DDCMPS2L [23] <23> and the Spindle [28] <28> cannot be pushed down any more.
(Step 2)
3. Turn the Packing Gland [25] <25> upside down and fix it, then push down the Spindle [28] <28> . (Step 3)
4. Insert the steel plate between the Gear [20] <20> and the Packing Gland [25] <25> , and push down the
Spindle [28] <28> with a hand press to remove it. (Step 4)
Replace the Ball Bearing 6201DDCMPS2L [23] <23> with new one every time should the gear be
disassembled because the stress while pulling out the gear is applied to the Ball Bearing
6201DDCMPS2L [23] <23> .
[28] <28>
[23] <23>
[25] <25>
[20] <20>
[27] <27>
[27]
<27>
[20]
<20>
Steel plate
Push
Push
Push
Fig. 6
Step 2 Step 3 Step 4
[23] <23>
[25] <25>
[28] <28>
[27] <27>
[28] <28>
[20] <20>
[23] <23>
[25]
<25>