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Precautions In Disassembly And Reassembly; Disassembly - Hitachi G 10SR3 Technical Data And Service Manual

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8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY

The [Bold] numbers in the descriptions below correspond to the numbers in the Parts Lists and exploded
assembly diagram for the Models G 10SR3, G 12SR3 and G 13SR3.

8-1. Disassembly

(1) Replacement of the armature and the stator
Loosen the Tapping Screw (W/Flange) D4 x 16 (Black) [51] to pull out the Tail Cover [49].
Remove the two Carbon Brushes (Auto Stop Type) (1 Pair) [39] from the Brush Holders [38].
Loosen the four Tapping Screws (W/Flange) D4 x 25 (Black) [1] which fix the Gear Cover Ass'y [3] to
remove the Armature [8] from the Housing Ass'y [37] together with the Bearing Holder [7].
Loosen the Special Nut M6 [4] which fixes the Pinion [5] to remove the Pinion [5].
Insert the hooks of the J-204 bearing puller between the Ball Bearing 628VVC2PS2-L [6] and the Bearing
Holder [7] from both sides and fix the hooks with the wing bolts.
Place the J204 bearing puller on a supporting jig and push down on the tip of the armature shaft with a
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hand press to remove the Ball Bearing 628VVC2PS2-L [6]. Then remove the Bearing Holder [7].
Remove the four internal wires from the Stator [11] connected with the Carbon Brush (Auto Stop Type)
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(1 Pair) [39], Pillar Terminal [41] and Switch [42].
Loosen the two Hex. Hd. Tapping Screws D4 x 65 [10] securing the Stator [11] and remove the Stator [11]
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from the Housing Ass'y [37]. If you have any trouble with removing the Stator [11], heat the Housing Ass'y
[37] to about 60ûC for easier dismantling.
(2) Replacement of the rubber bushing
Insert the J-201 Spring Hook H-75 (Special Repair Tool) between the Rubber Bushing [14] assembled in
the Housing Ass'y [37] and the housing ball bearing chamber and pull out the Rubber Bushing [14].
(3) Replacement of the Dust Seal
Insert the hooks of the J-204 Bearing Puller (Special Repair Tool, Code No. 970982) between the Ball
Bearing 626VVC2PS2L [13] and the Dust Seal [12] and fix the hooks with the wing bolts. Be careful not to
insert the hook too much.
Put the bearing puller on an appropriate stand. Push down the armature shaft with a hand press and pull
out the Ball Bearing 626VVC2PS2L [13].
Pull out the Dust Seal [12] from the armature shaft.
(4) Disassembly of the gear
Loosen the four Seal Lock Screws (W/Sp. Washer) M4 x 12 [24] that secure the Packing Gland [23] to the
Gear Cover Ass'y [3] and remove the Packing Gland [23] from the Gear Cover Ass'y [3].
Remove the Retaining Ring for D11 Shaft [16] that secures the Gear [18] to the Spindle [26].
Remove the Wave Washer [17] and the Gear [18] from the Spindle [26].
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