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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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1 Answer

My NT65AB is double firing every 4th to 8th fire, is there an adjustment on the trigger?


Chris, you will have to check your manual to see if your make and model has adjustment. Double fire is normally caused by one of three things,
1. The nailer is not being held down with enough pressure when the gun is fired.
2. Triggers valve is leaking and not releasing fast enough for a single shot.
3. The pressure fire feature on the nose of the gun (if applicable) is faulty.
If adding pressure does not help, then it is most likely faulty trigger, replace it. For guns that use a press-and-fire system, the spring in the nose of the gun may be worn, causing the double fire of nails.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
How to Diagnose Power Air Nailers
nailer double nailing
http://www.mastertoolrepair.com/images/How%20to%20Repair%20you%20Nailer.pdf

May 23, 2016 | Air Tools & Compressors

1 Answer

Gun fires 2 or 3 naiks everytime I pull trigger


Most nailers have two types of triggers available. One is a bump fire and the second is single shot that is activated by releasing the trigger, placing the contact foot against the work, then depress trigger. Bump fire trigger May fire two nails if you place then depress. Check your parts manual to determine which trigger is installed. (Some brands have built-in switch to activate bump) good luck

Jul 13, 2015 | Air Tools & Compressors

1 Answer

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.

Apr 11, 2015 | Air Tools & Compressors

1 Answer

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

Apr 12, 2013 | Dewalt D51321 3/4" 1 3/4" Heavy Duty Coil...

1 Answer

Why does my Hitachi nv45ab gun double fire nails?


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

Jan 23, 2013 | Hitachi Air Tools & Compressors

1 Answer

Hitachi NR83AA shoots two nails on one pull of the trigger?


Best practice is to bump fire the gun to prevent double fire. Do not place the gun on the work and pull the trigger. This takes practice while using at an angle. Works better if the nose piece has rather sharp points to help nose to stay in postion while you bump. With trigger depressed, practice without nails bumping/hitting wood at different angles untill you can bump hit at the spot that you need the fastener. If the gun double fires while bump-firing, most likely all the safety/trip parts are worn/loose. Not expensive to replace. Good luck.

Jul 05, 2012 | Air Tools & Compressors

1 Answer

Stanley bostitch double fires. It is an older stick feed. Works fine when I hold the trigger and tap the tip. But when I press the gun into the wood and pull the trigger it double fires. Gun is older, but...


You did not list your model number, however most bostitch nailers use the tva6 trigger valve. As this valve wears it will be erratic. Examine the firing pin that makes contact with trigger. If it looks worn or wabbles from side to side, then time to replace. To remove valve first remove trigger by removing roll with 3MM punch. Next remove one or two roll pins just above the valve, also 3mm. With roll pins removed air pressure will pop out valve. Be carefull because valve can come out with force, use glove or rag to catch. Parts available at www.toolpartsdirect.com, or generic valve at www.ebay.com. Good luck

Sep 18, 2010 | Stanley Bostitch Coil Framing Nailer

1 Answer

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

1 Answer

Nail gun double fires


There is one main part that can be the cause of the problem.

The trigger. Check to see if there is anything out of the ordinary with this. There should be some moving components attached to the trigger itself. Is any part of the trigger touching the button in the body of the gun when safety is not depressed. If the lever on the trigger is pushing on the button, even a little bit, It will allow the gun to fire again and again.

Mar 12, 2009 | Air Tools & Compressors

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