Precautions In Disassembly And Reassembly (Dh 25Dal, Dh 36Dal) - Hitachi DH 25DL Technical Data And Service Manual

2. Precautions in disassembly and reassembly (DH 25DAL, DH 36DAL)

The numbers in [Bold] correspond to the item numbers in the Parts Lists and the exploded assembly
diagrams.
1. Disassembly of the hammering mechanism section
Push in the Second Hammer [30] with a drill bit or a screwdriver. Remove the Striker [38] chucked by O-
ring (C) [35]. Remove the Tapping Screw (W/Flange) D5 x 25 (Black) [9] and the Tapping Screw
(W/Flange) D5 x 30 (Black) [88] from Gear Cover (A) [10] and remove Gear Cover (A) [10].
Remove from the end of Second Shaft (A) [50], and turn Second Shaft (A) [50] so that the Piston [40]
moves to its maximum upper position (inner cover side). The arm of the Reciprocating Bearing [52] can
then be disconnected from the Piston Pin [51], and Second Shaft (A) [50] and the components mounted on
it can be removed from the Inner Cover Ass'y [43] as a unit.
With a bearing puller, remove the First Gear [54] from Second Shaft (A) [50]. Then take off the
Reciprocating Bearing [52]. At this time, carefully note that the First Gear [54] must be aligned with and
press-fitted onto the 9 mm diameter end of Second Shaft (A) [50].
2. Removal of change lever (A)
Remove the Tapping Screw D2.6 x 10 [23] and turn Change Lever (A) [20] counterclockwise (in the arrow
direction) until " " mark on Change Lever (A) [20] points right below. Then Change Lever (A) [20] can be
removed. Be careful not to lose the Steel Ball D3.97 [24]. After removal of Change Lever (A) [20], the
Second Pinion [44], Clutch Spring [45], Clutch [46] and Lock Plate [49] can be removed as a unit.
Removal of change lever (A)
Tapping Screw
D2.6 x 10 [23]
Change Lever (A) [20]
Disassembly
Second Pinion [44]
-17-
Clutch [46]
Lock Plate [49] Clutch Spring [45]