Question about Dewalt D51844 Framing Nailer

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Air leaking around trigger - Dewalt D51844 Framing Nailer

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  • 191 Answers

Bad O ring in gun most likely. Usually happens on mine in the fire/reload phase. If its an oil lubricated gun give it a squirt of 3in1 if that doesn't help it will have to go to the repair place..

Posted on Jun 24, 2015

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rowdy45176
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SOURCE: dewalt 51844 round head nailer

Could be a couple things, the seal ring on top of the cylinder or a cut oring or just a faulty trigger valve assembly. I would take it back and have the repair shop correct the problem for you at NC. Let me know if still a problem and I will look at a schematic and give you part numbers.

Posted on Feb 17, 2009

  • 128 Answers

SOURCE: why would air leak from around the trigger...I

There is an o ring that seals the valve that is operated by the trigger. It sounds like this oring is defective, or missing. Home depot or lowes should have no problem returning this for you if it is less than 90 days. it is fairly complicated to disassemble.

Posted on Nov 21, 2010

Testimonial: "I appreciate the answer...I'll return it...it's only 1 day old...new out of the box and oiled properly!"

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1 Answer

My husky framing nailer leaks air around trigger


Leak around trigger could be trigger valve internal orings or orings on the outside of the trigger valve making contact against the body of the gun. Spray soapy water to determine where the air is leaking from. If air is leaking around the outside of the valve, most likely the orings were cut upon installation of the valve. If leaking from internal valve, most likely worn or broken oring; easy to fix if you have a source for orings.

To remove the trigger valve for service or inspection (take close-up photo of trigger area for reference ):
disconnect airline, remove nails, remove trigger retainer pin, remove trigger, remove roll pin /s holding trigger valve in place (use 3mm punch to remove retainer roll pins which are located in the body of the gun just above the trigger valve). With retainer pin/s removed and with gloved hand (under trigger valve), apply air pressure to gun to blow out the trigger valve (use lower pressure to push out trigger valve because it could come out with force.). With trigger valve in hand notice that there are two slots or groove cut neer top of the valve where the retainer pins rest, you will need to reinstall valve into body with slots aligned to retainer pins. Remove retainer pins holding trigger together to pull out internal valve. Good luck and post again if your have other question about the trigger valve.

Nov 15, 2012 | Air Tools & Compressors

1 Answer

Hitatchi nv45b2 trigger leaking


Air leaking around the trigger area could be caused by vinyl ball / gasket under trigger valve bushing or orings within the gun. Easy test, remove nails and connect air (assuming that air is now leaking around the trigger area). Depressing the trigger stops the leak, replace vinyl ball. Depressing trigger does not stop leak, move plunger b (plunger B, small shaft under bubber bushing next to the trigger valve) with your finger in then out to determine if air leak changes tone. If air leak changes sound or tone, then air is leaking past orings of the cylinder guide and/or cylinder plate and/ or the cylinder itself is scratched by debris where the orings make contact. Pull out the cylinder and examine the contact areas. If scratched, use 300 grit paper to smooth, if smooth, however, suspect the orings of cylinder guide (or cylinder guide is cracked). The cylinder guide is difficult to remove and install without causing damage to guide or cutting new orings when installing. Do not remove the guide unless all the other options have been checked. One last bit if information, I have noticed that some guns will leak air if the orings on the feeder piston do not fit snuggly. Make sure that leaking sound is not coming from feeder area (remove the basket and feeder/feeder pin/spring and pull out the feed piston, making sure that the largest oring is making good contact within the cylinder). Good luck with repair.

Sep 28, 2012 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

My hitachi roofing gun leaks air from trigger when not pressed


Two areas to check when air leaks from around the trigger. Rubber ball under trigger pin will cause air to leak, however when good side of the ball falls on the seat, air will not leak for a while. If air is leaking from plunger pin (just in fromt of the trigger pin), remove the head and pull out the cylinder plate to reveal broken oring (oring part # 876161). Good luck with your repair project.

Jun 05, 2012 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Why would air leak from around the trigger...I oiled this new gun and used it for 2 hours...now it leaks air from around the trigger...


There is an o ring that seals the valve that is operated by the trigger. It sounds like this oring is defective, or missing. Home depot or lowes should have no problem returning this for you if it is less than 90 days. it is fairly complicated to disassemble.

Nov 21, 2010 | Dewalt D51850 20 Full Round Head Framing...

1 Answer

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.

Jul 29, 2010 | Hitachi NV45AB2 Roofing Coil Nailer

3 Answers

I have a bostitch ridge runner that leaks air badly out of the trigger and wondering how to take out the plastic trigger in the gun. Also what would be the cause of the air leak


The air leak can be one of a few things. FIrst make sure that you have added some pneumatic oil to the air stream. This will lubricate the o-rings and make a tight seal. If that fails to resolve it, repalce the o-rings. (kits available for around $20). Next, woul dbe the trigger assembly itself. These triggers wear over time and are easily replaced.

See the website below for parts and a good diagram of the construction of the gun. You should be able to replace the parts by following the diagrams.

http://www.ereplacementparts.com/bostitch-parts-c-29443.html?gclid=CO6tkb2y6KICFciA5QodOlL9xg

Please note that the exactmodel number is required to get hte correct diagram.

Hope this helps,
Dan

Jul 12, 2010 | Stanley Factory Reconditioned Bostitch...

1 Answer

Leaking air from the trigger


if this is a Bostitch you have a bad o ring probably around the trigger and would need a trigger assembly, you didnt specify where the air is leaking from, please give me the brand and more details and I will try and help

Jun 12, 2010 | Air Tools & Compressors

1 Answer

My dewalt framing nail gun was hooked to the air compressor, but was not being used when it began leaking air which you could hear and got louder. It sounded like it was leaking around the trigger area....


There are O-ring seals around the trigger that are probably leaking. You can try to lubricate the gun by adding the pneumatic oil to the air supply. That may be enough to seal it back up. Otherwise the seals and/or the trigger assembly will need to be replaced.

Dan

Mar 29, 2010 | Dewalt Round Head Framing Nailer D51845

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