Hitachi H 90SE Technical Data And Service Manual page 19

Removal of the Striker [19] and related parts
Remove the four Nylock Bolts M10 x 45 [16], and separate the Cylinder Case [15] from the Housing Ass'y
[85]. From the Cylinder Case, take out the Striker [19], Piston [20] and Connecting Rod Ass'y [23] in a single
body. Next, remove the O-Ring (P-46) [22] from the back of the Piston, and pull out the Piston Pin [21]. The
Piston [20] can then be separated from the Connecting Rod Ass'y [23]. Finally, tap gently on the end of the
Piston to remove the Striker [19].
Disassembly of the Switch [43] and related parts
Pry off the Retaining Ring (E-Type) [27] with a small flat-blade screwdriver, pull out the Pin [25], and remove
the Switch Lever [26]. Then, remove the two Seal Lock Hex. Socket Hd. Bolts M6 x 30 [28] on the Handle (B)
side and the two Tapping Screws D4 x 20 [50], and remove Handle (B) [49].
Disassembly of the Retainer [1] section
Remove the two Roll Pins D6 x 55 [2] from the 6 mm dia. holes of the Retainer [1] and remove the Lever Pin
[3]. The Retainer [1] and two Retainer Dampers [6] and two Damper (B) [5] can then be removed from the
Front Cover [7] (Fig. 16).
Retainer [1]
Retainer Damper [6]
(2 pcs.)
Damper (B) (2 pcs.) [5] Roll Pin D6 x 55 [2] (2 pcs.)
Lever Pin [3]
Fig. 16
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Front Cover [7]