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Hitachi G 10SG Manual
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Hitachi G 10SG Manual

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1. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
The [Bold] numbers in the descriptions below correspond to the numbers in the Parts List and exploded
assembly diagram for G 10SG and the numbers <Bold> to those in the Parts List and exploded assembly
diagram for G 12SG.
1-1. Disassembly
1-1-1. Replacement of the Armature and Stator
(1) Remove the Brush Caps [47] <46> and take off the Carbon Brushes [48] <47>.
(2) Loosen the four D5 x 25 Tapping Screws [1] <1> which fix the Gear Cover Ass'y [4] <4>, and take off
Inner Cover [9] <9> together with the Armature [10] <10> from the Housing Ass'y [38] <38>.
At this time, make sure that the Rubber Bushing [16] <16> is fitted in the housing ball bearing chamber.
If the Rubber Bushing comes off the housing ball bearing chamber or adheres to the Ball Bearing [15]
<15> reassemble the disc grinder according to 8 - 2. Reassembly.
(3) Loosen the two Tapping Screws (W/Flange) D4 x 45 [58] <57> securing the Tail Cover [55] <54> and
remove the Tail Cover [55] <54>.
(4) Remove the four internal wires from the Stator [13] connected with the Brush Holder [49] <48>, the Pillar
Terminal [44] <44> (or Connector [45]) and the Switch [50] <49>.
(5) Loosen the two Hex. Hd. Tapping Screws D4 x 70 [12] <12> securing the Stator [13] <13> and remove
the Stator [13] <13> from the Housing Ass'y [38] <38>. If you have any trouble with removing the Stator
[13] <13>, heat the Housing Ass'y [38] <38> to about 60 C for easier dismantling.
1-1-2. Replacement of the Rubber Busing
Insert the J - 201 Spring Hook H - 75 (Special Repair Tool) between the Rubber Bushing [16] <16>
assembled in the Housing Ass'y [38] <38> and the housing ball bearing chamber and pull out the
Rubber Bushing [16] <16>.
1-1-3. Replacement of the Dust Seal
(1) Insert the hooks of the J-204 Bearing Puller (Special Repair Tool, Code No. 970982) between the Ball
Bearing [15] <15> and the Dust Seal [14] <14> and fix the hooks with the wing bolts.Be careful not to
insert the hook too much.
(2) Put the Bearing Puller on an appropriate stand. Push down the armature shaft with a hand press and
pull out the Ball Bearing [15] <15>.
(3) Pull out the Dust Seal [14] <14> from the armature shaft.
MODELS
−1−
G 10SG/G 12SG

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Summary of Contents for Hitachi G 10SG

  • Page 1 1. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The [Bold] numbers in the descriptions below correspond to the numbers in the Parts List and exploded assembly diagram for G 10SG and the numbers <Bold> to those in the Parts List and exploded assembly diagram for G 12SG.
  • Page 2 1-1-4. Disassembly of the Pinion and Gear (1) Loosen the M7 Special Nut [5] for G 10SG (M6 <27> <18> Special Nut <5> for G 12SG) on the Armature [10] [26] [18] J-129 Gear Puller < 10 > , and remove the Pinion [6] <6>.
  • Page 3 Fig. 9 (6) When replacing the Gear Cover Ass'y [4] <4>, lubricate the metal part with mixed oil. Mixed oil: Mixture of Hitachi power tool grease No. 2 (Unilube No.00) and tubine oil * Mixure ratio..1:1 (weight ratio) * Volume..0.5 cc...

  • Page 4: Lubrication Points And Types Of Lubricant

    * Pinion chamber of Gear Cover Ass'y [4] <4>...Nippeko grease (SEP-3A) 10 g Generously rub grease onto the Gear and Pinion. * Metal..............Mixed oil 0.5 cc Mixed oil: Mixture of Hitachi power tool grease No.2 (Unilube No. 00) and turbine oil Mixture ratio..1:1 (weight ratio)

  • Page 5: Wiring Diagrams

    1-5. Wiring Diagrams For China Switch [50] <49> Stator [13] <13> Black Black Brown Cord [59] <58> Blue Black Black Pillar Terminal [44] <44> For Hong Kong and Indonesia Switch [50] <49> Stator [13] <13> Black Black Black Brown White Cord [59] <58>...

  • Page 6: Insulation Tests

    1-6. Insulation Tests On completion of disassembly and repair, measure the insulation resistance, and conduct the dielectric strength test. : 7 M Ω or more with 500 V DC Megohm Tester Insulation resistance Dielectric strength test : AC 4,000 V/1 minute, with no abnormalities....220 V - 240 V (and 110 V for U.K.

  • Page 7: Standard Repair Time (Unit) Schedules

    2. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow G 10SG G 12SG Switch Switch Holder Tail Cover Housing Ass'y Cord Armor Stator Brush Holder Slide Bar Spring Slide knob General Assembly Pinion Ball Bearing (608VV)

This manual is also suitable for:

G 12sgG 10g