Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 45

Machine Screw M4 x 6 [33]
Chamber section
Roll Pin D3 x 32 [25]
Cylinder Ass'y [42]
Lead Valve [45]
Buffer Cover [44]
Hex. Socket Hd.
Bolt M4 x 10 [43]
Hex. Socket Hd. Bolt M4 x 10 [61]
Spring Washer M4 [131]
Pushing Lever Arm (B) [62]
Pushing Lever Spring [63]
Pushing Lever Connector [68]
Switch Plate [34]
Muffler [50]
Machine Screw
M4 x 6 [46]
Housing Ass'y [74]
O-ring (I.D. 66.27) [36]
Retaining Ring [37]
Piston Ring [38]
Piston Bumper [40]
Fig. 33
--- 42 ---
Piston [39]
Chamber Stop Rubber [41]
Cylinder Plate [57]
Seal Lock Hex. Socket Hd.
Bolt M5 x 10 [58]
U-Nut M4 [59]
Pushing Lever Arm (A) [60]
Spring Washer M4 [131]
Hex. Socket Hd. Bolt
M4 x 10 [61]