Question about Makita AN901 Coil Nailers

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Makita AN 901 framing nailer blows nose end apart

I am a small contractor in Nova Scotia. Canada and we have 3 AN 901 framing nailers in circulation. We used these nailers for the last 7 years and my guys as well as myself love them. They are very light and well balanced and have some great features that are hard to find on other nailers. The problem is for the last couple of years we can not stop the nailers from blowing apart the metal nose piece or discharge end. We have had the nailers replaced under warranty twice and ended up taking one out of service to rob the part to make another work. Makita has said that there is no problem but have no solution or answer to how this happening. We have tried 3 different brands of nails but it makes no difference as all have had the same result at some point. It breaks where the piston drives the nail down through the chamber and exits the gun. It shatters this metal peice into sharp fragments which causes cause for safety concerns. This seems to happen as result of two nails trying to be fired at the same time thus causing enough pressure to rupture the cahmber. I am game to try a different nail or method or any suggestions anyone may have. They have since told me that I am not the only case of this problem as someone from Montreal has had the same problem. We have tried Prime Nails ( offshore nails ), Duchene nails and Senco nails in both 2.5 and 3.25" with problems. If anyone else has problems please email me at

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  • David Ford
    David Ford May 11, 2010

    I would take a look at the air pressure 65-120 max. Then I would look at the piston/driver to make sure that is flat and condition of the bumper. While your at it check over the feed mechanism. Usually when they try and fire 2 at a time the piston might not be retracting fully or the pawls are damaged or worn. I worked for Makita and never saw the problem that you are describing. You might also want to check the collation of the nails that they drop into the pawl dogs properly. They do make a rebuild kit for this tool if any parts are worn. Good luck. Dave



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Not too familiar with makita brand nailers but jams are usually caused by cheap nails but I see you have tried senco brand which is a good brand sounds like a mfg defect try using hitachi brand nailers they are good

Posted on May 29, 2009


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