Precautions In Disassembly And Reassembly; Disassembly - Hitachi G 10SD2 Technical Data And Service Manual

8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY

The [Bold] numbers in the descriptions below correspond to the numbers in the Parts List and the exploded
assembly diagram for G 10SD2 and G 12S2, and the <Bold> numbers to those in the Parts List and the exploded
assembly diagram for G 13SD.

8-1. Disassembly

(1) Disassembly of the Armature
1) Loosen the Tapping Screw D4 x 16 [51] <52> to pull out the Tail Cover [50] <51>.
2) Remove the two Carbon Brushes [39] <40> from the Brush Holders [40] <41>.
3) Loosen the four Tapping Screws D5 x 25 [1] <1> which fix the Gear Cover Ass'y [4] <4> to remove the
Armature [9] <9> from the Housing [35] <36> together with the Bearing Holder [8] <8>.
4) Loosen the Special Nut M7 [5] <5> which fixes the Pinion [6] <6> to remove the Pinion [6] <6>.
5) Insert the hooks of the J-204 bearing puller between the Ball Bearing [7] <7> and the Bearing Holder [8]
<8> from both sides and fix the hooks with the wing bolts.
6) Place the J204 bearing puller on a supporting jig and push down on the tip of the armature shaft with a
hand press to remove the Ball Bearing [7] <7>. Then remove the Bearing Holder [8] <8>.
(2) Disassembly of the Dust Seal
1) Insert the hooks of the J-204 bearing puller between the commutator and the Dust Seal [13] <13> from
both sides, and fix the hooks with the wing bolts.
2) Place the J204 bearing puller on a supporting jig and push down on the armature shaft with a hand press to
remove the Dust Seal [13] <13> together with the Ball Bearing [14] <14>. Replace the Dust Seal [13] <13>
with new one because it is damaged by the removal of the Ball Bearing [14] <14>.
(3) Disassembly of the Stator Ass'y
1) Remove the Armature [9] <9> and then pull out the two Brush Holders [40] <41> from the Housing [35]
<36>.
2) Disconnect the internal wires of the Stator (A) [12] <12> from the Brush Holders [40] <41>.
3) Loosen the set screw of the Slide Switch [44] <45> and disconnect the two internal wires coming from the
Stator (A) [12] <12>.
4) Remove the Fan Guide [10] <10> from the Housing [35] <35>.
5) Loosen the two Hex. Hd. Tapping Screws D4 x 70 [11] <11> to remove the Stator (A) [12] <12> from the
Housing [35] <35>. If the Stator (A) [12] <12> cannot be removed easily, heat the Housing [35] <35> to
about 60 ˚C. Then the Stator (A) [12] <12> can be removed.
(4) Disassembly of the Slide Knob
1) Loosen the Tapping Screw D4 x 16 [51] <52> to pull out the Tail Cover [50] <51>.
2) Hold the Housing [35] <35> and raise the Slide Bar [42] <43> until the Slide Knob [34] <35> moves to the
"ON" position.
3) Check that the Slide Knob [34] <35> has not moved to the "ON-LOCK" position, and push down the Slide
Knob [34] <35> until it clicks while keeping the Slide Bar [42] <43> raised.
4) Raise the Slide Knob [34] <35> straight up and remove it keeping the Slide Bar [42] <43> raised.
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