Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 53

Mount the Pushing Lever Spring [63] and insert the Cylinder Ass'y [42] into the Housing [71]. At this time, fit
the convex portion of the Pushing Lever Connector [68] in the end of the Pushing Lever Spring [63] being
careful not to remove the Pushing Lever Spring [63] (Fig. 45).
Secure the Cylinder Plate [57] to the Cylinder Ass'y [42] with the Seal Lock Hex. Socket Hd. Bolt M5 x 10 [58]
and join the Cylinder Ass'y [42] with the Housing [71].
Make the Cylinder Plate [57] contact with the convex portion of the cylinder. Do not tighten the Seal Lock Hex.
Socket Hd. Bolt M5 x 10 [58] with the Cylinder Plate [57] overlapped on the convex portion (Fig. 46). At this
time, insert the Blade Guide [53] between the Cylinder Ass'y [42] and the Cylinder Plate [57].
* Because it is difficult to mount the Blade Guide [53] later because the Cylinder Plate [57] pushes the Blade
Guide [53].
* Do not use any bolt other than the Seal Lock Hex. Socket Hd. Bolt M5 x 10 [58] because a special adhesive
is used for the Seal Lock Hex. Socket Hd. Bolt M5 x 10 [58].
Finally, secure the Switch Plate [34] to the Chamber [24] with the Machine Screw M4 x 6 [33].
* After mounting the Cylinder Ass'y [42] to the Housing [71], mount the Switch Plate [34] to the Chamber [24].
Note that the Cylinder Ass'y [42] cannot be mounted to the Housing [71] if the Switch Plate [34] is mounted
to the Chamber [24] first.
Cylinder Ass'y [42]
Convex portion
Fig. 45
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Pushing Lever Spring [63]
Pushing Lever Connector [68]