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

10-5. Disassembly and Reassembly of Handle Section

(1) Disassembly and reassembly of handle (A) ass'y and handle (B) ass'y (Fig. 50)
The handle section is comprised of handle (A) ass'y and handle (B) ass'y.
[Tools required]
Hex. bar wrench (3 mm)
Phillips screwdriver
(a) Disassembly
Perform disassembly according to 10-2, 10-3 and 10-4. Remove the cylinder head section and the housing
section to isolate the handle section.
Remove the Tapping Screw (W/Flange) D4 x 45 [80], Tapping Screw (W/Flange) D4 x 20 (Black) [83], Tapping
Screw (W/Flange) D4 x 16 (Black) [78] and Hex. Socket Hd. Bolt M4 x 18 [127] then pull out the Magazine
Guard [128].
Gently pull up handle (A) facing handle (B) (hooked side) downward. Then handle (A) ass'y is separated from
handle (B) ass'y.
* Be careful not to lose the following parts that are apt to drop.
Trigger Spring [97]
Trigger [98]
Switch Lever (B) [114]
Lever Stopper [116]
Spring [129]
(b) Reassembly
Reassemble handle (A) ass'y and handle (B) ass'y according to 10-5 (2), (3). Place handle (B) ass'y on a
workbench and put handle (A) ass'y on handle (B) ass'y. Perform reassembly gently being careful not to drop
the Lever Stopper [116].
Insert the Magazine Guard [128] not to separate the handle section completely. Move Switch Lever (B) [114]
to the designated position. Adjust the Spring [129] with a small flat-blade screwdriver so that the lower end of
the Spring [129] is put on Switch Lever (B) [114].
Tighten the six tapping screws (three kinds).
If the Tapping Screw (W/Flange) D4 x 20 (Black) [83] is tightened instead of the Tapping Screw (W/Flange)
D4 x 16 (Black) [78], the screw boss of handle (A) may be damaged. Be careful of the screw length.
Tighten the screw aligning with the female thread portion of the handle at reassembly.
Overtightening the Hex. Socket Hd. Bolt M4 x 18 [127] may deform the handle ass'y and cause hard nail
loading. Do not apply tightening torque excessively. The tightening torque is acceptable if the bolt is seated.
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