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Hitachi nailer doesn't fire, it has no leaks. When trigger is pulled there is no back pressure from trigger

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  • 8 Answers

I've had that happen before and what I found was one of the Staples or nails had misfired and wedged before leaving the gun. read the manual on how to get to it for that particular model and also it might be a good idea to adjust your pressure accordingly to keep it from happening again. If the force isn't set proper then a nail could Jam , block the mouth and not allow any other nails to exit. It's very easy to do and not that hard to fix once you've done it at least once. Good luck.

Posted on Feb 11, 2019

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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phoenixinks
  • 89 Answers

SOURCE: flooring nailer tech support

couple of things there are o-rings inside that trigger assy. they are either pintched in or dry. next there could be internal rubber hoses inside the gun. might need replacing. lastly the hose or o-ring going to the back side of the ram is leaking or broken. here is what i would do. you sound pretty handy with your tools so i would get somewhere clean start taking the gun apart thouroghly noting where everything went and go untill you find the problem. but first i would shoot a couple of drops of oil into the air input on the gun then hook it up and fire a few off and see if it clears up, if not then start takeing it apart. I CAN NOT STRESS ENOUGH....DO THIS ON A CLEAN SERFACE WITH YOUR HAND CLEAN. i chased a leak around in a pnumatic hammer for 3 days all because it wasnt clean on the inside..

Posted on Jan 14, 2009

  • 25 Answers

SOURCE: 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.

Posted on Apr 19, 2009

  • 1407 Answers

SOURCE: brad nailer not firing nail...can hear brief air noise upon pulling the trigger

Porter cable makes a number of brad nailers (18 gauge) that very quickly suffer from the problem that you are having. You did not mention the model number of your gun but if it is one of these, (bn125a, bn200a, ns100a) kit # 60061 will fix the problem. It costs between 25 and 30 dollars. Google that part number or order from www.dewalt.com. Dewalt owns the porter cable brand. Before you order the kit, check that the driver blade is not bent and stuck. The driver should travel freely down the cylinder. When you install parts, use Danco silicone grease to lube (availabel at Lowes in the plumbing department) If your model # is different from those mentioned above, please email me and I will recommend a repair.

Posted on Apr 27, 2009

comax
  • 154 Answers

SOURCE: Stanley finsish nailer and air is leaking through the trigger as.

If the air is coming out the trigger it must be replaced. Depending on the model of gun you will have to replace the trigger assembly or various o-Rings. Find a Bostitch dealer in your area and they will supply the parts you require.

Posted on Jul 14, 2009

  • 142 Answers

SOURCE: Senco 601 nailer shoots 2 nails each time the trigger is pulled.

the 601 had a design flaw, in the nose, where the nails hit as the are being pushed forward, the peice was made out of a peice of metal that was too soft, it wore down and that is where you get the double nail problem.

Senco offered a trade in, this was years ago, for a limited time and gave us credit towards new guns, which we gladly did

Posted on Dec 31, 2009

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I have a Hitachi NR83A3 framing nail gun. It won't drive nails flush. Adjusting the depth screw from one extreme to the other doesn't appear to help or change the driven nail depth. Any ideas?


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I think it is leakin air thru the trigger what would cause that


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Various reasons, secondary switch faulty. gas out of date, gas is colld, iar leak, faulty spark unit.

Suggest you get it checked out at a repair centre.

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NRA833AA model. air is leaking out of trigger valve & will not fire. require manual to check operation.


Here is a link to hitachi web site listing for your gun. Look at the bottom of the page for pdf files of parts lists and manual.
http://www.hitachipowertools.com/store_item.php?iID=154&arrPath=1,9,43,p154,

There are two areas around trigger that can leak air. Spray soapy water on trigger stem and/or plunger valve. If leak is at trigger stem check vinyl ball. If leak is at plunger valve, most likely worn or broken oring inside of gun. Remove head and pull outer ring to reveal two orings. A worn outer oring will cause leak at plunger. If orings are ok on outer ring, pull cylinder and check for scratches where orings contact. If scratched, sand with 400 grit paper untill smooth and repack gun with oring kit. Good luck.

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When I take the trigger apart and then put it back in the same way it then leaks air. I have 4 guns and I have been carefully cleaning them. Each time I take the trigger parts out and clean them and...


I believe that the most popular roofing gun for professionals is the hitachi line of nailers. Hitachi guns are amoung the very few however that actually move the cylinder when fired instead of the headvalve. This is rather odd because it requires more moving parts. Your guns have a trigger pin/plunger (white plastic with small oring part # 878-121) that pushes on a urethane ball. This ball is potential cause of leaks. Make sure that the ball is perfect. Replace as needed. Most leaks around the trigger area are acutally coming from just in front of trigger which is plunger pushed by safety foot. Spray soapy water around trigger area and make sure where air is actually leaking. If leaking from safety foot plunder source of leak is actually orings inside of gun around cylinder. (usually oring part #876-161 that fits on the cylinder plate). Parts and parts lists are at www.toolpartsdirect.com. Good luck with your guns and post again if you have other question.

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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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