Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 39

(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Apply designated oil (Code No. 885-546, Code No. 885-246) to the O-ring [15] and the Mount Sleeve [9].
Mount the Mount Sleeve [9] with the uneven surface faced outward.
Align the end of the Motor Spring [12] with the center of the Motor Mount [8] and rotate it as shown in Fig. 27.
Set the Cylinder Head [14] and the Motor Mount [8] as shown in Fig. 28 and secure with the Hex. Socket Set
Screw M4 x 5 [31]. At this time, lightly press the Motor Mount [8] in "A" direction to prevent the Motor Mount
[8] from floating.
Setting position
End
Motor Mount [8]
Motor Spring [12]
Position after rotation
End
Fig. 27
Motor Mount [8]
Do not widen the clearance between
the ribs when aligning.
Cylinder Head [14]
Fig. 28
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Motor Mount [8]
Motor Spring [12]