Repair Guide; Precautions On Disassembly And Reassembly - Hitachi NV 90HMC Technical Data And Service Manual

3-1/2” high pressure coil nailer

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The following describes the most essential precautions on disassembly and reassembly of the nailer.

The NV 90HMC Coil Nailer mainly consists of six sections: output section, air duster valve section, control

valve section, magazine section, nail feeder section and cap section.

[Bold] numbers in the description below correspond to item numbers in the Parts List and exploded

assembly diagram for the Model NV 90HMC.

CAUTION: Before starting disassembly and reassembly of the nailer, be sure to lock the trigger (by

turning the lock lever to the "Lock" position, disconnect the air hose, empty the

compressor's air tank, and remove all nails from the nailer.

1. General notices on reassembly

• Apply grease (Attolub No.2) to O-rings and O-ring sliding portions.

• When mounting an O-ring, be careful not to damage it and keep the O-ring and its groove clean.

• Apply grease (Attolub No.2) to the inner surface of Cylinder [36].

• Replace a broken Gasket (C) [17] and Packing (B) [8] with a new one and make sure it does not leak

any air.

• Always keep the control valve section away from any contaminant.

• Apply the supplied oil to the nail feeding slide section.

• When replacing Piston Bumper [45], be sure to check and make sure the air channels of Body Ass'y

[42] and Nose [47] are free from broken pieces of Piston Bumper [45] and other unwanted particles.

• Nylock High Tension Bolt M7 x 25 [56]---------------------------------- 19.6 ± 3 N•m{ 200 ± 30 kgf•cm}

• Seal Lock Hex.Socket Flat Hd. Bolt M5 x 10 [1] ------------------------- 4.4 ± 0.3 N•m {45 ± 3 kgf•cm}

• Hex. Socket Hd. Bolt M5 x 22 [115]----------------------------------------- 8.3 ± 0.5 N•m {85 ± 5 kgf•cm}

• Nylock Bolt M5 x 65 [4] -------------------------------------------------------- 8.3 ± 0.5 N•m{85 ± 5 kgf•cm}

• Nylock Hex. Socket Hd. Bolt M4 x 12 [133]------------------------------- 4.4 ± 0.3 N•m {45 ± 3 kgf•cm}

• Machine Screw (W/Washers) M5 x 25 (Black) [105] ------------------- 1.96 ± 0.5 N•m {20 ± 5 kgf•cm}

• Tapping Screw D3 x 14 [148]------------------------------------------------- 0.5 ± 0.2 N•m {5 ± 2 kgf•cm }

• Cap [62]---------------------------------------------------------------------------- 24.5 ± 5 N•m {250 ± 50 kgf•cm}

• Air Plug L-Pt 1/4 [64] ----------------------------------------------------------- 24.5 ± 5 N•m {250 ± 50 kgf•cm}

• Valve Bushing [33] -------------------------------------------------------------- 9.8 ± 2 N•m {100 ± 20 kgf•cm }

REPAIR GUIDE

Screw Tightening Torques

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