Question about Milwaukee Tool Milwaukee 7120 - 21 Coil Roofing Nailer

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I have a Milwaukee Roofing Nailer. It worked great out of the box, but now the the metal rod that drives the nail will not properly retract. I must use a screwdriver to push this rod back up into the nailer so that the next nail can advance into position. I have oiled extensively.....both internally and externally. Please help.

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Where can i buy parts? Everywhere says that they are discontinued. I have an expensive gun that is worthless because i cant buy parts to repair it.

Posted on Nov 17, 2015

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Your nailer has a rubber band (cylinder ring) around the cylinder that causes piston to return to top. Remove head, remove cylinder and check that band is in place. It covers a series of holes around cylinder. This band should fit snuggly or it will slip off cylinder. Too much oil will cause this band to swell. While you have the gun apart, check that the piston fits snuggly in cylinder. The piston should not slide down cylinder under its own weight. Parts are available at www.toolpartsdirect.com. Good luck on your repar.

Posted on Aug 21, 2010

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2 Answers

Whats the difference between a roofing nail gun and an ordinary nail gun ?


A roofing nail is designed to be easier to be removed, they have a smooth shank and wide head that hold down shingles. A siding nail has a ring shank. A roofing nailer is used to quickly pin down shingles across a roof, the depth at which they are drive in is generally shallower than a siding nail.
You can read a little more about roofing nailers here Best Roofing Nailer Shooting From the Hip Woodworking Tool Guide.

Aug 02, 2017 | Air Tools & Compressors

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I have a porter cable roofing nailer model # RN175 that does not advance the nails everytime what causes this?


Some causes, in order of probability:
Roofing nailers get a lot of tar build up on them, especially around the nose safety and nail feed pawl area. Cleaning off this buildup will usually take care of most problems with roofing nailers.
On the side of the gun away from the side you load the nails on there is a small cylinder with a piston inside that attaches to the feeder pawl. If air isn't getting to the piston or the piston's o-ring or spring is damaged, it won't cycle properly to advance the nails.
If the driver doesn't retract fully, the next nail won't be able to advance properly for the next shot. This can be caused by o-rings in the head that are worn or out of their proper place.

Oct 06, 2012 | Air Tools & Compressors

1 Answer

My makita an451 roof nailer keeps shooting 2 nails I've tried 2 different brands of nails


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.

Sep 17, 2011 | Makita Roofing Coil Nailer AN451

1 Answer

My milwaukee roofing gun works for a couple hours but then it wont feed the nails properly so it doesnt fire the nails anymore. what can i do?


It's quite possible that the areas through which the nails move in the tool need to be cleaned and or lubricated with light oil such as WD40. Rust or dirt from nails can build up on surfaces in the unit.
Check your manual for details.

Feb 16, 2011 | Milwaukee Tool Milwaukee 7120 - 21 Coil...

1 Answer

I have a bostictch roof gun it will shoot 2 nails at once what is the problem


check for the proper nail collation and then check the feed pawl to make sure it is working properly, also check to make sure driver is fully retracting,

Oct 27, 2010 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Feeding nails


Your nailer shares design features with Milwaukee and Ridgid. All three brands experience the same issue. Lets go thru a series of simple tests to determine the problem. First and most simple test, manually load the nails and fire the gun untill miss-fire. Upon mis-fire disconnect air, open latch and check if the driver is all the way up into the cylinder or is partially down blocking next nail. If driver is down blocking next nail, replace the driver oring and retest. If driver is up all the way, remove nails, reconnect airline, leave latch open and fire gun against rubber (old tire or coiled up waterhose/airhose) this time holding the gun down and keeping the trigger depressed. In this position, the driver will remain down and feeder will remain retracted. With feeder retracted and screwdriver in hand carefully check the spring tension on the feeder (should be rather firm tension on spring and the feeder must retract with good force). If no tension or weak, replace feed spring. When you finally release the trigger, the driver will retract and the feeder should return with good force. If feeder does not return with force, replace orings and spring behind feed piston. If all tests are ok, remove head, check lower bumper in gun for cracks or missing pieces. Replace as necessary. Lube all orings with silicone lube available at Lowes in the plumbing department. (Danco brand) Good luck on your repair and email your questions.

May 06, 2009 | Porter Cable Cable RN175AR Reconditioned...

1 Answer

Porter Cable Roofing nailer rn175a


Replace the O Rings and the trigger valve assembly. 9/10 sticking rods on the Porter Cable guns is caused by a faulty TVA.

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