Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 43

(b) Reassembly
Reassembly procedures should be followed in the reverse order. Note the following points.
Mount the Plate Sleeve [54] facing the stepped portion to the handle so that the stepped portion fits in the
concave portion of the Side Plate [55] (Fig. 31).
Check that each lever protruded from the handle section fits in each hole on the side of the handle of the
housing section (Fig. 32).
Align the Pushing Lever [64] with Adjuster Bush (S) [67] fitting the convex portions in the concave portions
before tightening the Hex. Socket Hd. Bolt M5 x 10 [66].
If the U-Nut M5 [56] turns together when tightening the Hex. Socket Hd. Bolt M5 x 20 [13], insert a small flat-
blade screwdriver between the handle and the U-Nut M5 [56] to stop turning of the U-Nut M5 [56].
Housing section
Stepped portion
Plate Sleeve [54]
Convex portion of Handle (A) [124]
Convex portion of Handle (B) [84]
Concave portion
Fig. 31
Switch Lever (B) [114]
Chamber Lock Bar [100]
Switch Arm [82]
Fig. 32
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Slide Plate [55]
Handle section