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Nailer Hitachi NV50AE fires double sometimes

Fires double in single fire mode sometimes.
(model has switch for single and bounce model)

Can you give me advise on how to fix this?

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A dirty trigger will cause unit to stay in the firing position. Try cleaning it with a spray contact cleaner.

Posted on Jan 11, 2009

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DOUBLEFIRINF AND JAMMING. DONT HAVE A MANUEL SO NEED TO KNOW WHAT NAIL TO USE AND THE ANGLE


Double fire is usually caused by trying to use a bump fire trigger system as single fire (place on work then pull trigger). If however the gun double fires when bump firing, replace the trigger valve. Some nailers have the ability to select bump or single fire. The selector for bump or single fire is usually on the trigger or just above or below the safety actuator. Other brands offer different triggers available as a part number.
When trying to determine what nail to use, look for the model number of the nailer. Letters associated with the model number will give you a clue. Example; the letters RN in the model number indicates Round head Nail. The angle of the nail is easy to determine. Just measure the angle formed by the path of the driver and any straight line of the rails.

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Keeps repeating itself


Most nailers have a two position setting on the trigger to allow for single fire or bump fire. If set on bump fire, the gun will work better when you bump fire the gun instead of placing the gun on the work then depress trigger. Bump fire works best when safety spring has good tension. Easy test. Make sure that the safety spring is in place (with air hose removed, contact foot should spring back quickly when pushed against work). With air connected, hold trigger and quickly bounce the gun against the work. If the gun does not fire when you bump, the trigger is most likely set to single fire. With trigger set to single fire, you must place the gun against the work, then depress trigger. If the gun shoots two nails while set to single fire, most likely worn trigger or worn out trigger valve. These parts are not expensive and are easy to replace. Good luck

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This gun should be bump-fired only. Do not place the gun on the work and press trigger. Make sure that the safety spring is in place and has good tension. The spring helps to push the foot off the trigger so that it fires once. You could also adjust the screw that pushes on the firing valve. Turn in or out several turns till head of nail is correct when bump firing then lock the nut. The safety foot fits rather loose on the gun and should still work ok but can get so loose that it falls off the nose. Good luck

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New user will jam the gun/ nails because gun was most likely not bump fired. Placing the gun then depressing trigger will usually cause double fire in the hands of new user. New user should practice on scrap lumber bump firing at many angles till they get the idea; or give them a training period with a nailer that has a single shot trigger (they may develop bad habits with single shot however).

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My hitachi nv45ab double fires


Your nailer has two adjustments that could be the problem. One is just up from the door hinge. You will see a thumb wheel. Turn the wheel till the safety can move all the way up. Next adjust the screw below the trigger plunger by backing off the locknut and turning the 5mm bolt up or down a few turns into a different position. This is the depth adjuster. Most operators bump fire this nailer. Good luck

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Fires 2 & 3 nails every so often.


Most all nail guns can be converted to single fire, however, usually parts must be changed. Some brands have two positions on the trigger, others have a button position near the trigger to accomplish same. Check with dealer or email your gun model # and I will explain your to fix. For now you can replace the spring on the safety with one slightly stiffer. Also try nailing with trigger depressed and quickly bump the gun to fire, this method usually works better than placing the gun in position then firing. Good luck with your repair.

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My hitachi nr 90 gc nailer was always slow to fire a nail with about a second delay between pulling the trigger and firing the nail. now however the gun will only fire a nail once in about 20 attempts, and...


Trigger may be dirty, as an electrical switch the contacts can be intermittent. Also check to see if the safety plunger is set to correct depth and moving freely. Dirt can build up here......

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Nail gun- double feed


Nail guns either have a switch or a seperate trigger assembly for two options - automatic, or 'bump' fire, and sequential fire. Sequential firing may be best for you since the nose must be fully depressed and the trigger pulled for each nail.

If you're stuck with bump firing, practice your technique. Double fires often occur when the workpiece bounces back into the nose of the gun; learn to 'bounce' the gun off the material to avoid this second contact.

If you're getting double fires in sequential mode, the problem could be more serious. I keep a can of aerosol silicone lubricant on hand to clean and lubricate the feed mechanism and magazine. Make sure your tool is clean and lubricated before each use, including the 3-5 drops on the air coupling.

Check that your air pressure is not set too high. Overdriving nails reduces their effectiveness and can cause tool malfunction.

This problem could also be caused by worn out O-rings or other parts within the tool. If you're not comfortable servicing the tool yourself, take it in for repair/maintenance work.

Another important thing to remember: With tools like this, you get what you pay for. A cheap nailgun will never function as well as a quality nailgun.

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As you pull the trigger slowly the tool cycles several times


It sounds like you have a contact trip trigger that you are trying to operate as a sequential trip. Sequential trip is when you have to put the tool against the work and pull the trigger every time, contact trip is when you pull the trigger and tap the nailer on the work and it fires. If you operate a contact trip like a sequential it will fire but it usually fire more than one nail. Your instruction manual will explain this, sometimes they give you two seperate triggers for the two modes or there is an adjustment on the nailer.

Aug 03, 2009 | Stanley Air Tools & Compressors

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