Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 64

(3) Disassembly and reassembly of Handle (B) [84], Controller [101] and the related parts
[Tools required]
Spanner
Hex. bar wrench (4 mm)
Phillips screwdriver
Roll pin puller (2.5 mm (0.098"))
(a) Disassembly (See Fig. 54-2.)
Remove the Trigger Spring [97] and the Chamber Lock Bar [100].
Remove the Pin D2.5 [115] and Switch Lever (B) [114].
Remove the Tension Plate [113] from Switch Lever (B) [114].
Remove the Tapping Screw (W/Flange) D4 x 14 (Black) [95] to remove the Magazine Plate [94].
Remove the Prism [96].
Remove the Flat Hd. Tapping Screw D4 [104] to remove the Wiring Cover [103].
Remove the Switch Arm [82] and the Lock Bar Spring [102].
Remove the Tapping Screw (W/Flange) D4 x 14 (Black) [95] to remove the Controller [101] and Internal Wire
(A) [86]. Disconnect the connector of the Controller [101] and Internal Wire (A) [86]. Remove the Roll Pin
D2.5 x 10 [99] with a roll pin puller to remove the Trigger [98].
Remove the Switch Mount [81] from Internal Wire (A) [86].
Remove the Nylon Nut M5 [92] and the Hex. Socket Hd. Bolt M5 x 15 [76].
Remove the Sleeve [77] and the hook ass'y.
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