Question about Porter Cable RN175 Roofing Coil Nailer

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I have an rn175 porter cable roof air nailer. I need to know exactly where the check seal goes on the cylinder and which way it goes on, Can you help please

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Here is a Link to a number of schematics for different Porter Cable Nailers:

Toward the bottom of this page you will see (5) different schematics for RN 175 Types. You can zoom in on the parts to see where they go.

If you need further instruction, let me know.

Good Luck!


Posted on Oct 15, 2010

  • mnstertruck Dec 12, 2010

    Schematic doesn't show where on the cylinder to install check seal #125.
    It fits quite nicely over the location for #126.



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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

Porter cable roofing nailer piston won't retract

Could be the check-band around the cylinder. Easy to check. Remove the head and pull out the cylinder. There should be a rubber band covering a series of pin-holes drilled into the cylinder. Usually the band will fall out of place or break. Use any rubber that will stay in place to cover the holes. Good luck.

Oct 16, 2012 | Porter Cable RN175 Roofing Coil Nailer

2 Answers

Firing pin wont retract

If you haven't gotten it unstuck by now try this: take the air line off so it isn't pressurized take a punch about the same or slightly smaller than the hammer/firing pin/the part that drives the tack, and drive it back to where it clears whatever is jamming it. Clean it, oil it and try again. If it still fails, here is a site that offers parts and kits:

If you have another source you can try it as well. Good luck.

Sep 08, 2012 | Porter Cable RN175 Roofing Coil Nailer

1 Answer

Using a Porter Cable RN175A and it stopped working.

for technical service (888) 848-5175

866-375-6287 their number

Sep 06, 2012 | Porter Cable RN175 Roofing Coil Nailer

1 Answer

My RN175 shoots you think it shot the nail, but when you move the gun to shoot the next nail the nail you just shot falls out the end of the gun. What could cause this?

The driver is coming down far enough to break the nail off the strip but not far enough to drive it in. This could be caused by any of the following:
- The driver is broken off and too short to drive the nail
- The driver is bent and doesn't travel all the way down
- The seal/o-ring on the piston is damaged and air is leaking past it
Any of the above will require you to remove the head and inspect the driver, piston and o-rings or have a service center check it out.

Mar 07, 2012 | Porter Cable RN175 Roofing Coil 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

I just found our old RN175 and wonder if I should and where it needs to be oiled before use?

put about 6 drops of air tool oil in the fitting and then plug in and shoot some nails to relube the o rings. Let me know if you need more assistance.

Nov 09, 2010 | Porter Cable RN175 Roofing Coil Nailer

1 Answer

Air is blowing from the top of the gun

Leaking from top is usually caused by the upper bumper (part #886113). This vinyl part will begin to crack/crumble causing improper seal. Order bumper only or overhaul kit #903789 that replaces most parts in gun. Order from Good luck

Sep 18, 2010 | Porter Cable RN175 Roofing Coil Nailer

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

Roofing Nailer driver won't return

I too have a Model RN175 Type 1 which will fire one fastener without retruing the driver. This Type 1 does not have the selectable trigger (that allows alternating between single shot and automatic firing). So the previously posted solution (selector mid-way between SS and AS) doesn't apply here. I did a rebuild of the body and replaced the trigger assembly. Still no joy.

I called Porter Cable customers service and technical engineering (888-848-5175 and they suggested check the following items:
1) free movement of the head valve piston and good condition of the spring and o-ring
2) the condition and position of the check seal. This is a rubber sleeve with a lip that must slide up onto the anodized cylinder and COVER THE HOLES. (It has to be installed AFTER the big white plastic cylinder spacer is installed.)
3) the exhaust port to make sure that there was not trash stuck up in there
4) correct air supply pressure
Turned out for me that it was item #2 that was my problem. The rubber sleeve was not stretched up onto the anodized cylinder. This was probably due to initially hitting something hard when nailiing (blew it out of position) then my reassembling it incorrectly.
Hope this helps!
Great nail gun, great company, great customer service!

Mar 14, 2009 | Porter Cable RN175 Roofing Coil Nailer

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