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Roofing nailer wont fire porter cable rn174a

All i here is air now and win i pull the triger there is no pressure

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9 times outa 10 this is an oring on the driver blade regulator inside the head. it can be removed by undoing the top you may probably find your problem there

Posted on May 26, 2009

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My porter cable roofing nailer rn175 type 1 it fire's and the rod stayed out and air comes out what part do I need to fix


Could have check valve out of place or broken. Easy to check. Remove head and pull out the cylinder and the round cylinder spacer. Look for black band that should have been covering small holes just below the cylinder spacer. Replace band if broken or if good install the cylinder ring on the cylinder then install the band and finally reinstall the assembly into gun. Look for any broken/cracked parts in the head of the gun. Good luck

Aug 28, 2013 | Porter Cable RN175 Roofing Coil Nailer

1 Answer

Miss fires and wont sink nails depth set deep and pressure over 120 psi


If no air is leaking from gun, miss-fire is usually caused by worn or too tight piston oring or lack of lubrication. Easy test. Disconnect airline, remove nails, point nose of gun up then down. Driver should stay in uppermost position. If driver moves up then down within gun replace piston oring and retest. Set pressure to about 100psi. Good luck with repair.

Oct 14, 2012 | Porter Cable Coil Roofing Nailer

1 Answer

My RN 175 roofing nailer (porter cable) fires like a machine gun. I cleaned the trigger valve assembly and replaced the o-ring at top of the asembly. Still fires in high repetition.


With most nailers there is a safety device that has to be depressed as you press the gun against the work that is being nailed. This safety device might be damaged or jammed in the firing position allowing the gun to act like an automatic.

Mar 14, 2011 | Porter Cable RN175 Roofing Coil Nailer

1 Answer

My porter cable roofing gu won't fire a nail and leaks air what is the problem?


May just be dirty, remove head and pull out head valve. Clean parts and reinstall using silicone paste lube available at plumbing store (or at Lowes, it is used for lubricating faucet orings). Check cylinder seal for cracks and cylinder spacer for for cracks or broken orings and replace as needed. Reinstall head and test. Good luck

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1 Answer

Air goes thru my Porter Cable RN175 and out the muffler


I would replace them all. Check the inlet Valve/fitting too.

Feb 03, 2010 | Porter Cable RN175 Roofing Coil Nailer

2 Answers

Drives nail too deep while adjusted "light" fully


Hello. In additionn to adjusting the gun, you can also adjust the air pressure you are sending to the gun by reducing the pressure coming out of the compressor. Regards, Joe

Dec 07, 2009 | Porter Cable Coil Roofing Nailer

1 Answer

Porter cable brad nailer only fires brad on second trigger pull


The dent in the wood is not caused by the air. It's caused by the set that drives the brad. Are you oiling it consistenly? Are the brads the right manufacturer for your porter cable brad nailer? From the information you give it appears that the brads are not advancing correctly or that the air pressure is not sufficient to dislodge the brad from the brad strip on the first strike - it takes an additional strike to break it free. The standard for adding oil is to add ten drops of air tool oil for every hour of operation. That seems like a lot, but the correct amount of oil is a sure way to prevent most air tool problems.

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BN125A Nailer will not fire even after rebuild kit


low air pressure may be the cause ,make sure you set the outlet to 70- 90psi

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