Disassembly And Reassembly Of The Housing Section - Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual

(2) Disassembly and reassembly of the housing section (Fig. 33)
[Tools required]
Hex. bar wrench (3 mm (0.118"), 4 mm (0.157"))
Spaner (7 mm (0.276") or slender hd. pliers
Roll pin puller (3 mm (0.118"))
Phillips screwdriver
Retaining ring puller for C-type hole
Small flat-blade screwdriver
(a) Disassembly
Remove the Seal Lock Hex. Socket Hd. Bolt M5 x 10 [58] to remove the Cylinder plate [57].
Remove the Machine Screw M4 x 6 [33] to remove the Switch Plate [34]. Note that the Cylinder Ass'y [42]
cannot be removed from the Housing Ass'y [74] without removing the Switch Plate [34].
Push the tip of the Cylinder Ass'y [42] in the Housing Ass'y [74]. Then the Cylinder Ass'y [42], chamber
section, Pushing Lever Arms (A) [60] and (B) [62] can be removed from the Housing Ass'y [74] in a single unit.
It is easy to remove them while pressing the side of the Housing Ass'y [74] with a hand (Fig. 34).
Remove the two Pushing Lever Springs [63] with a hand.
Remove the two Roll Pins D3 x 32 [25] with a roll pin puller to remove the chamber section from the Cylinder
Ass'y [42].
Secure the U-Nut M4 [59] with a spanner (7 mm (0.276")) or slender hd. pliers and loosen the Hex. Socket Hd.
Bolt M4 x 10 [61]. Then Pushing Lever Arms (A) [60] and (B) [62] are separated from the Pushing Lever
Connector [68] and they can be removed from the Cylinder Ass'y [42].
Remove the O-ring (I.D. 66.27) [36] and two Chamber Stop Rubbers [41] with a hand.
Remove the two Hex. Socket Hd. Bolts M4 x 10 [43]. Then the muffler section can be disassembled into
Buffer Cover [44], Lead Valve [45] and Muffler [50].
Note that a special sealant is used for the Cylinder Ass'y [42]. Select a liquid silicon sealant capable of
resisting temperatures up to 300ûC.
--- 41 ---