Hitachi DH 24PD3 Technical Data And Service Manual page 26

(2) Disassembly of the dust collection adapter ass'y
Disassembly of the Hose Ass'y [101] only
Loosen the knob that fixes the stopper, and push pipe (A) to its maximum stroke position. This will cause the
Hose Ass'y [101] connection portion of pipe (A) to come out of the rear end of pipe (B). In that state, pull on
the Hose Ass'y [101] to separate it from pipe (A).
Disassembly of the dust collection adapter ass'y (Refer to Fig. 14.)
Disassemble the Rubber Cap [97] and the Nozzle Seal
[96] from the nozzle portion, and remove the screw that
fastens nozzle (A) and nozzle (B). While pressing the
claw head of nozzle (B) in the direction indicated by
arrow "A" in Fig. 13, insert the tip of a thin flat-blade
screwdriver between the surfaces in front of the claw-
connected portion and pry up gently to disengage the
claw so that nozzle (A) and nozzle (B) can be removed
from pipe (A). Next, take the stopper off from pipe (A),
and remove the O-ring from the tail cap side so that the
tail cap can be removed from pipe (B). Pipe (A) can then
be taken out from pipe (B) by enlarging its split section
after removing the retaining wing bolt.
(3) Disassembly of the striking mechanism section
Push in the Second Hammer [28] with a drill bit or a screwdriver. Remove the Striker [36] chucked by O-ring
(C) [33]. Push the Pushing Button [22] fully when the Change Lever [25] is positioned "Rotation Only" (
mark) as shown in Fig. 15. Then turn the Change Lever [25] by 135û clockwise. Ply out the Change Lever
[25] at this position. Remove the Tapping Screw (W/Flange) D5 x 90 [9] from the Gear Cover [10] and
remove the Gear Cover [10].
The Inner Cover Ass'y [40] and the Housing [77] are loosely fitted together. Attempting to pull them out first
could cause the Armature [71] to be pulled out at the same time, causing damage to the Carbon Brushes [83].
Remove the Spacer [55] and Spring (B) [56] from the end of the Second Shaft [57], and turn the Second Shaft
[57] so that the Piston [38] moves to its maximum upper position (inner cover side). The arm of the
Reciprocating Bearing [61] can then be disconnected from the Piston Pin [49], and the Second Shaft [57] and
the components mounted on it can be removed from the Inner Cover Ass'y [40] as a unit.
With a bearing puller, remove the First Gear [62] from the Second Shaft [57]. Then take off the Reciprocating
Bearing [61]. At this time, carefully note that the First Gear [62] must be aligned with and press-fitted onto the
9 mm diameter end of the Second Shaft [57].
The Clutch [60], Clutch Spring [59] and Washer (B) [58] can then be removed from the Second Shaft [57].
Retaining wing bolt
Connection
surfaces
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Pipe (B)
Pipe (A)
House Ass'y [101]
Nozzle (A)
Nozzle (B)
Fig. 14