Repair Guide; Precautions In Disassembly And Reassembly (Dh 25Dl, Dh 36Dl) - Hitachi DH 25DL Technical Data And Service Manual

Be sure to remove the storage batteries from the main body before servicing. Inadvertent triggering of the
switch with the storage battery connected will result in danger of accidental turning of the motor.

1. Precautions in disassembly and reassembly (DH 25DL, DH 36DL)

The numbers in [Bold] correspond to the item numbers in the Parts Lists and the exploded assembly
diagrams.
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 [20] is positioned "Rotation Only" ( mark). Remove the Tapping Screw
D2.6 x10 [19] and turn the Change Lever [20] by approximately 200 clockwise. Adjust the " " mark of the
Change Lever [20] to the center of the notch on the gear cover. Ply out the Change Lever [20] at this
position. Remove the Tapping Screw (W/Flange) D5 x 25 (Black) [9] and the Tapping Screw (W/Flange) D5
x 30 (Black) [82] from the Gear Cover [10] and remove the Gear Cover [10].
The Inner Cover Ass'y [39] and Housing (A). (B) Set [66] 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 Brushed [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].
Disassembly of the striking mechanism section
Gear Cover [10]

REPAIR GUIDE

Disassembly
Change Lever [20]
Tapping Screw D2.6 x10 [19]
-12-
Notch
A
Viewed from "A"
Notch