Hitachi DH 14DL Technical Data And Service Manual page 23

(2) Remove the Spacer [35] from the tip
of the Second Shaft [36] and move
the Piston [29] to the top dead
center (Inner Cover Ass'y [33] side)
by turning the Second Shaft [36].
Then the arm of the Reciprocating
Bearing [38] can be removed from
the Piston Pin [34] and the
components mounted on the
Second Shaft [36] can be removed
from the Inner Cover Ass'y [33] as a
unit.
(3) Remove the First Gear [40] from the
Second Shaft [36] with a bearing
puller and remove the Reciprocating
Bearing [38], Needle Cage [39] and
Clutch [37] from the Second Shaft
[36].
Note that the First Gear [40] is
aligned with and press-fitted onto the
9-mm dia. end surface of the Second
Shaft [36].
Disassembly of the hammering mechanism
Piston [29]
Rotate
Second Shaft [36]
Spacer [35]
Removal of the components mounted on the second shaft
Reciprocating
Bearing [38]
Clutch [37]
Needle Cage [39]
20
Reciprocating Bearing [38]
Inner Cover Ass'y [33]
Components mounted
on the second shaft
First Gear [40]
Second Shaft [36]
Press-fitting position
of the First Gear [40]