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10-1-2. Disassembly of the inner cover
(1) Removal of the change lever
Remove the Needle D2.5 x 25.8 [17] and the Change Lever [14]. The Needle D2.5 x 25.8 [17] is just inserted
in the hole without press-fitting. If it is difficult to remove the needle, utilize the magnetic attraction of a magnet
bit or the like.
10-1-3. Disassembly of the speed change-over section
(1) Removal of the shift plate
Loosen the Seal Lock Flat Hd. Screw M4 x 14 (Black) [19]. Since this screw is secured with a bonding agent,
it cannot be easily loosened except by heating the overall gear cover section. After loosening the screw, the
Shift Plate [20] can be removed.
(2) Extraction of the gears
By using a wooden hammer, gently tap the connecting portion of the Gear Cover [10], and the Second Pinion
[13], Gear [11], Shift Arm [22] and Seal Plate [21] can be removed from the gear cover interior.
10-1-4. Disassembly of the hammering section
(1) Removal of the Drill Chuck [2] (See Fig. 7.)
Remove the Drill Chuck [2] of the fully assembled main body in accordance with the following procedures.
(a) Fully open the jaws of the Drill Chuck [2], and turn the Flat Hd. Screw (A) (Left Hand) M6 x 25 [1]
clockwise and remove it. Take care that it is left-hand threaded.
(b) Fix the hexagonal bar wrench M10 into the Drill Chuck [2] as indicated in Fig. 7. Next, apply a wrench
17 mm to the hexagon bolt on the spindle to hold it steadily, and remove it by turning counterclockwise.
If it is difficult to loosen, use a pipe extension or similar tool.
Fig. 7
Drill Chuck [2]
Wrench 17 mm
Hexagon bolt
Hexagonal bar wrench M10
