Question about Senco Air Tools & Compressors

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SN IV shoots nail fine but loses air out the top

I^ve replaced most of o rings but evidently not the right one

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  • Senco Master
  • 1,815 Answers

Exhaust seal insite the top on top or gasket ?

Posted on Oct 26, 2015

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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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  • 125 Answers

SOURCE: won't feed nail

This happens to my gun too. You probably need to oil the gun once in a while. Here is how you fix it:
Disconnect the gun from the compressor first don't wanna get hurt or anything like that. There is a pin that shoots the nail out well that pin is jammed so what you have to do is push that pin to the original position. using a flat head screwdriver would help you to push that pin back into place. Let me know how that turns out please. I pretty sure that is the problem with your gun. Make sure you lubricate the Nailer once in a while.

Posted on Oct 02, 2008

Idaho_Biker
  • 32 Answers

SOURCE: depth of nails

Sounds Like it's time for a Rebuild. On the Other Hand the tool may not have a Steady regulated pressure setting??
After further research I came up with a Contact Number for You for Porter-Cable for Service Centers 888-848-5175, I'm sure They can Help You Troubleshoot this Nailer more In-depth...
IF, You can't get any satisfaction with the Service Center you come up with, get back in touch with me, and give me an Area of the Country your In, and perhaps I can get you to a Better solution. I reviewed your Model Parts Schematic and seen Several Parts that could be the Culprits. But at this Point I strongly feel That Porter-Cable Service Center would be Your BEST alternative. Good Luck!!

Posted on Mar 27, 2009

rowdy45176
  • 2176 Answers

SOURCE: Leaks air around the trigger.

sounds like the trigger valve has a broken o ring and would need replaced. you can go to Bostitch.com and order one for it, they are not that hard to install.

Posted on Jan 16, 2010

Testimonial: "Thanks, you are right, you fixed the problem."

  • 2 Answers

SOURCE: Senco Framepro 602 has air

Sounds like the bar that slides down to push the nail is jamed you should disconect it from the air and check to make sure a nail is not stuck you should be able to look at the gun and see how to disasemble it in the front end to release it once that is done try some white grease on the part befor you reasemble it

Posted on Nov 21, 2010

Testimonial: "You were correct. It's now working. Thanks"

  • 1388 Answers

SOURCE: my makita an451 roof nailer

Nailers that use strips of nails (one nail directly behind the other) will sometimes drive two nails at once and is caused by damage to the driver. The nails are so close together that the driver will hit the first and part of the second nail head. Coil nailers, as your an451, use nails seperated by welded wire making it very difficult the the driver to hit the second nail. Usually when a coil nailer shoots two nails, it is acutally the trigger valve that acutates twice (two very rapid fires). Two very rapid fires is caused by faulty trigger valve. I have seen a roofing coil nailer fire one nail and a second nail drops out of the gun. Caused by weak / malfunction of nail feeder or wire used to weld nails together is too thick.

Posted on Sep 27, 2011

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1 Answer

Proper nails for a SENCO SN IV


2" to 3 1/2" 2" for sheathing and 3 1/2" for stud framing.

Apr 09, 2015 | Senco Air Tools & Compressors

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My airace framing air nail gun blows air when i try to shoot it


Look for an O ring kit,,many times the firing cap seal splits thus loss of air

Mar 30, 2013 | Air Tools & Compressors

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My senco frame nail gun isn`t working


First get an exploded view of gun and parts list and numbers from senco.com,,take nail gun apart,,,take a good look at the rubber bumper stop to see if it is broken,,look at the driver nut to see if it is tight,,,,you can go to juldan.com once you have gotten a list of the worn parts,,,juldan sells complete o ring kits along with nearly all parts needed for your repair

Jan 18, 2013 | Senco Air Tools & Compressors

1 Answer

FR350 won't shoot nails


Normally I would say you aren't using enough air pressure because somewhere around 80psi (every tool is different) will not be enough to fully retract the driver. At 110 you are fine so that is not the case. I doubt it is broken because a broken driver will still retract unless it broke near the piston. My guess is it needs the o-rings replaced but you can pull the top head and pull the driver out first to make sure. Parts and breakdowns can be found here as DeWalt owns Porter Cable.

PC FR350 diagram

Aug 19, 2012 | Porter Cable Air Tools & Compressors

1 Answer

Paslode 900600 Trim nailer not sinking nails


The firing pin can be completed or part of it crooked worn and can have a little burr on its way and stuck in the cylinder somewhere o-rings worn and hardened, have a tilting piston on the firing pin somewhere in the cilinder

Jul 27, 2017 | Air Tools & Compressors

1 Answer

I have a N80SB stick nail gun that have been leaking air from the trigger valve but was still able to shoot nails. After 3 months of discontinued use, I plugged in the air hose and fire the first nail


A new trigger valve and o-ring kit will give you a like new gun. Just remember to replace all available o-rings in the kit, lightly grease all of them as you reassemble the gun and use pneumatic oil at the beginning of the day so you won't be doing it again in a couple months.

Feb 23, 2012 | Stanley Bostitch Stick Framing Nailer...

1 Answer

When firing nailer first nail shoots good but next nails head will get stuck between the push rod chamber. push doesnt seem to return fully top when nail is cycled.


Try oiling the tool first. Remove the nails, squirt a decent amount of air tool oil in the stem where the air hose coupler connects, and fire the tool a dozen times or so. Then put in the nails and test. If it still hangs up then it will need the o-rings replaced.

Jun 11, 2011 | Porter Cable Coil Roofing Nailer

1 Answer

Senco Finishpro18 just stopped shooting nails. Took it apart put it together. Shoots a couple of nails then stops. Press the nailer against the target pull the trigger and air comes out of the handle.


I just had the same problem with mine. Exact same symptoms. My guess is that your gun hasn't been used in a while.

I called Senco and they recommended removing the top cap, removing all o-rings (one at a time) gently stretch them, put a small amount of lithium grease in the o-ring track, and replace the o-rings. This fixed my problem and I hope it fixes yours!

Senco has awesome tech support for their tools. I will not buy another brand because of their support. 800-543-4506

May 15, 2010 | Senco FP18 FinishPro 18 - Gauge Brad...

1 Answer

Leaks air around the trigger. Doesn't shoot the nails at 100psi, I think it is a F28WW Bostitch shoots the 2'' and 31/2'' nails


sounds like the trigger valve has a broken o ring and would need replaced. you can go to Bostitch.com and order one for it, they are not that hard to install.

Jan 16, 2010 | Stanley Air Tools & Compressors

1 Answer

Porter cable fc350a frame nailer shoots just air


Could be a couple things, first are you using the right nails in the gun e.g. collation and degree. Second do the nails move freely in the magazine and how is the pusher spring on the nail does it have enough pressure. Then I would unplug from air remove all the nails andjust tap the nose on a piece of wood and does the driver drop? If so the piston Oring is worn and needs replaced, but if you do that I would recommend replacing all the rubber. Let me know and I would need the exact model number to come up with parts.

Jan 25, 2009 | Porter Cable Cable No. FC350A Clipped Head...

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