Precautions In Disassembly And Reassembly; Disassembly - Hitachi G 12SE2 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.

8-1. Disassembly

(1) Disassembly of the armature (Fig. 5)
1. Open the Lever [31], loosen the Machine Screw (W/Washers) M5 x 25 [32], and remove the Wheel Guard
Ass'y (Toolless Type) [35].
2. Loosen the two Tapping Screws (W/Flange) D4 x 35 [48] and the Tapping Screw (W/Flange) D4 x 20 [50], and
remove Tail Cover (A) [54] and Tail Cover (B) [47].
3. Remove the two Carbon Brushes [51] from the Brush Holders [52].
4. Remove the four Tapping Screws D5 x 25 [2]. The Armature [12] can then be taken out simultaneously with
the Gear Cover Ass'y [4], Packing Gland [25], and related parts.
5. Remove the four Seal Lock Screws (W/Sp. Washer) M5 x 16 [26].
The Packing Gland [25] can then be taken out together with the Spindle [28] and the Gear [20].
6. After removing the two Seal Lock Screws (W/Sp. Washer) M4 x 10 [1], the Armature [12] can be extracted
together with the Bearing Cover [11] and related parts.
7. Carefully wrap the Armature [12] with a soft, clean rag to protect it from being damaged, and clamp it securely
in a vise. Then, remove the Nut M8 [5] and extract the Pinion [6].
8. For the models indicated under Fig. 5, the Ball Bearing 629T12DDC3PS2-L [9] can be removed from the
Armature [12] by utilizing a J-204 Bearing Puller (special repair tool, Code No. 970982) as illustrated.
After the ball bearing has been removed, the Bearing Cover [11] can be easily taken off.
J204 Bearing Puller (Code No. 970982)
Fig. 5
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