Hitachi DH 24DV, Technical Data And Service Manual, Page: 28 / 39

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(1) Disassembly of the striking mechanism section
Push in the Second Hammer [26] with a drill bit or a screwdriver. Remove the Striker [34] chucked by O-ring
(C) [31] . The Change Lever [19] is positioned "Rotation Only" ( mark) as shown in Fig. 11. Remove the
Tapping Screw D2.6 [17] and turn the Change Lever [19] by approximately 200 û clockwise. Adjust the " "
mark of the Change Lever [19] to the center of the notch on the gear cover. Ply out the Change Lever [19] at
this position. Remove the Tapping Screw (W/Flange) D5 x 25 (Black) [9] from the Gear Cover [10] and
remove the Gear Cover [10] .
The Inner Cover Ass'y [39] and Housing (A). (B) Set [67] are loosely fitted together. Attempting to pull them
out first could cause the Armature and Pinion Ass'y [55] to be pulled out at the same time, causing damage to
the Carbon Brushes [61] . Remove from the end of the Second Shaft [41] , and turn the Second Shaft [41] so
that the Piston [36] moves to its maximum upper position (inner cover side). The arm of the Reciprocating
Bearing [46] can then be disconnected from the Piston Pin [45] , and the Second Shaft [41] and the
components mounted on it can be removed from the Inner Cover Ass'y [39] as a unit.
With a bearing puller, remove the First Gear [48] from the Second Shaft [41] . Then take off the Reciprocating
Bearing [46] . At this time, carefully note that the First Gear [48] must be aligned with and press-fitted onto the
9 mm diameter end of the Second Shaft [41] .
The Clutch [44] , Clutch Spring [43] and Washer (B) [42] can then be removed from the Second Shaft [41] .
9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
The numbers in [Bold] correspond to the item numbers in the Parts List and exploded assembly diagrams.
9-1. Disassembly
Tapping Screws D2.6 [17]
Fig. 11
Change Lever [19]
Gear Cover [10]
Notch
Viewed from "A"
Notch
A