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MODELS

             

G 10SG/G 12SG

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.

−1−

Summary of Contents for G 10SG

Page 1: ...4 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...

Page 2: ... sure to soak the inner diameter of the Felt Packing 22 22 with machine oil Otherwise its dust sealing function will fail to work properly resulting in an earlier damage of the Ball Bearing 21 21 3 When replacing the Armature Ass y 10 10 and the Ball Bearing 15 15 on the commutator side press inward on the Dust Seal 14 14 while taking care of its direction until the end face of the Dust Seal 14 14...

Page 3: ... 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 3 Connect to the Brush Holder 49 48 on the same side as the Name Plate 39 39 Connect to the Brush Holder 49 48 on the same side as the Hitachi Label 46 45 Connect to the Cord 59 58 with a Pillar Terminal 44 44 or clamp to the Co...

Page 4: ...20 5 kgfcm 1 5 0 4 ft lbs M4 Slotted Hd Screw Seal Lock 7 7 1 8 0 4 Nm 18 4 kgfcm 1 3 0 3 ft lbs M4 Seal Lock Screw W SP Washer 19 19 24 24 1 8 0 5 Nm 18 4 kgfcm 1 3 0 3 ft lbs D5 Tapping Screw 1 1 2 9 0 5 Nm 30 5 kgfcm 2 2 0 4 ft lbs M5 Machine Screw W SP Washer 28 28 1 6 0 4 Nm 16 4 kgfcm 1 2 0 3 ft lbs Special Nut M7 5 6 4 1 0 Nm 65 10 kgfcm 4 7 0 7 ft lbs Special Nut M6 5 6 4 1 0 Nm 65 10 kgfc...

Page 5: ... 59 58 Pillar Terminal 44 44 For Hong Kong and Indonesia Stator 13 13 Switch 50 49 Cord 59 58 Connector 45 For Other Countries Stator 13 13 Switch 50 49 Pillar Terminal 44 44 Black or Brown Black Black Black White or Blue Black Black Black Black Black Black Black Black Cord 59 58 ...

Page 6: ...DC Megohm Tester Dielectric strength test AC 4 000 V 1 minute with no abnormalities 220 V 240 V and 110 V for U K products AC 2 500 V 1 minute with no abnormalities 110 V 127 V expect U K products 1 7 No Load Current Value After no load operation for 30 minutes the no load current value should be as follows 6 Voltage Current A max 110 V 115 V 220 V 230 V 240 V 2 7 2 7 1 35 1 35 1 38 ...

Page 7: ...Wheel Guard Ass y Pushing Button Gear Cover Ass y Lock Pin Gear Bearing Cover B Ball Bearing 6001VV Felt Packing Packing Gland Spindle Fringer Pinion Ball Bearing 608VV Ball Bearing 626VV Inner Cover Armature Dust Seal Rubber Bushing Housing Ass y Stator Slide Bar Spring Slide knob G 12SG MODEL Variable Fixed 10 20 30 40 50 60 min ...

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