Question about Hitachi NR90GC2 Cordless Gas Clipped Head Framing Nailer

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The fan runs constantly when the battery is inserted why?

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  • Mark Apr 15, 2015

    There is a small micro-switch that provides one of the two necessary firing inputs to the control circuitry which is likely to be faulty. This is wired as a normally open contact. When you push the nail gun into the timber it pushes this switch and runs the fan which mixes the gas for ignition. Then you normally press the trigger activating another micro-switch for the control input to fire the spark.
    At a guess without viewing the gun you'll need to. replace this micro-switch and you'll be good to go. There are several reasons why they fail, moisture, internal corrosion, heavy use and dust and dirt. If they fail sometimes they will fail in a closed contact position. Pull your gun apart and test with a multimeter. Looking for clean continuity on closure, 0.5 ohmn or less and infinity on open. Replace the micro-switch if faulty.

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There is a small micro-switch that provides one of the two necessary firing inputs to the control circuitry which is likely to be faulty. When you push the nail gun into the timber it pushes this switch and runs the fan which mixes the gas for ignition. Then you normally press the trigger activating another micro-switch for the control input to fire the spark.
At a guess without viewing the gun you'll need to. replace this and you'll be good to go.

Posted on Apr 15, 2015

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