What part is faulty when a pneumatic nail gun does not leak any air, is not jammed, but does not fire?


I have a Porter Cable DA250C (15ga angle finishing nailer).

Worked fine yesterday until it just stopped. The gun does nothing at all when the trigger is depressed. It is not jammed. The piston is oiled and I can move it smoothly with my finger.

All the troubleshooting guides and other people posting online about nail guns always mention air leaking from somewhere. But, in my case, there is no air leaking at all. It just acts like it is not plugged in. But there is definitely air going in, it just does nothing when the trigger is pulled. There is no sound and nothing moves.

I took it apart, but nothing looks visibly damaged. Any idea which part may be faulty? Is there a test I can try to determine the...

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Check your Pressures at the compressor, Do you have enough PSI recommended for the particular nail gun you are tying to use? If theres not enough PSI you will not get any nails being driven, try to increase your PSI and are you sure the air regulator is reading correctly?

Is your nail feeder engaged? If not the nails will not be fed into the hammer causing the symptoms your describing.

Did you load your nails in the nail gun properly? If the nails are not loaded property you will get the symptoms your describing.

Often to common i see this to often when people by nails, Some people think a 15 or 18GA nail is a nail. Not all are alike and not all are compatible with every gun. Look thew your owners manual, each nail gun manufacture specifies the correct Gauge of nail, (Degree) Angle of nail, Thickness of nail and the length of the nail that you can use in your gun. These have to be all within your nail gun manufactures specifications your using, if there off or not...

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This isn’t an all-encompassing course in nail gun repair, but if you’re experiencing a faulty nail gun, read this before tossing yours out the nearest window. There are several early warning signs that a nail gun is heading down the path to becoming scrap metal. The more common ones are firing only air, the trigger jamming, double or triple firing, and air leaking.

One of the Most Important Things many Beginners Fail to Do!

The first thing to remember – or know – is that most pneumatic nail guns need oil applied on a regular basis to function properly. As far as the machine is concerned you should apply a few drops before or after every nailing session, but this may result in excess oil leaking out onto the work piece or your hands – which can leave stains as well as grubby oily fingers – just plain messy.

So for those of you who don’t use nail guns all too often, instead of applying oil religiously every nail-gunning session, you could opt to apply it on a...

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Have you ever tried firing a pneumatic nailer, only to hear air leak when pulling the trigger? If so, you're not alone. Over time, wear and tear will take its toll on any air tool, regardless of the brand. The best way to prevent an issue on the job, practice preventative maintenance. Keeping pneumatic tools properly lubricated with air tool oil, as well as cleaning them regularly will help prevent wear. Storing tools in plastic helps to keep dust and other elements out - especially when sitting for extended periods of time.

But what about the unavoidable issues, like an occasional air leak?

If you try to fire a pneumatic nail gun or stapler, but only hear air leaking when engaging the trigger, it's likely that your tool's "O-Ring" is not sealing properly. When the trigger is not depressed, you may not hear air leaking, as the valve is probably sealed. However, once you engage the trigger, the valve looses its seal, therefore creating a gap for the escaping air you hear coming...
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Speed and accuracy when working are very imperative. It is, however, a frustrating when using a machine that is faulty and giving you a hard time. When it comes to nail guns or any other tool for that matter, they are bound to get old and rusty at some point. You can, however, keep yours in good condition by maintaining it well.

The earliest warning sign of a broken nail gun is jamming, firing air and double firings. If you experience or observe this with your nail gun, then it’s time for some maintenance to get your nailer back to shape. The reasons for this faults are avoidable if you adhere to the basic nail gun support which only includes having to oil nail gun.

Why pneumatic nail guns need oil?

The reason why oiling is imperative is fundamental science. Every tool, every machine that has moving parts requires lubrication to ensure the smooth movement of the parts. Maintenance through lubrication provides for extending the lifespan of the devices....

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A nail gun works on compressed air.

When you hook the air hose to the gun it fills a cylinder with air pressure.

When you pull the trigger. the cylinder pressure is released onto a firing pin that shoots the nail.

The air pressure line is also connected to the trigger and therefore the trigger has to be sealed.

When ever using a nail gun, you add a bit of gun oil in the back of the gun (not 3-in-1motor oil, it has to be non-detergent gun oil)

If you haven't used the gun in a while, it is best to oil up the gun and let the oil run down into the gun.
If you use anything but gun oil, the seals will give out.

Your trigger seal has given out. It is probably an 'O' ring. You can access it by taking it apart. Look for the O ring.
Bostich makes re-build kits for the different guns that you can buy on-line.
Back when I was in construction, there were several nail gun shops that sold and serviced nail guns, and sold nails to the...

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Nailers are now used on almost every jobsite, and in many private residences as well. According to the Centers for Disease Control, almost 30,000 construction workers are seriously injured in nail gun accidents every year. And tragically, those numbers have been steadily rising over the past decade.

While efficiency has made nail guns commonplace on construction sites around the country, these are inherently dangerous tools. When used improperly, nailers can cause serious damage, and put operators out of work for life.

Using A Pneumatic Nail Gun Safely

There’s a right way to use a nail gun and a wrong way. Learn to use your nailer safely and you’ll vastly decrease the chances of causing, or sustaining, an injury yourself.

This guide covers the specific dangers presented by pneumatic (air-driven) nail guns, because they’re by far the most popular type. For more general tips, check out our Nailer Safety Guide here.

Consider Your Compressor...

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Nail guns use electric solenoids, pneumatic rams, or combustion-driven pistons to fire nails at speeds exceeding 200 miles an hour (321 kph), so any attempts at repairing these tools must involve a great deal of caution. Before attempting a nail gun repair, it is important to unplug the tool from the electricity or compressed air supply, or remove the ignition source if it is a combustion unit. One common issue with nail guns is a jammed feeding mechanism, which can sometimes be repaired by disassembling the tool and removing the excess nails that have become stuck. Pneumatic nail gun repair often involves a leaking o-ring, so if one of these tools malfunctions a seal kit is often required. Electric nail gun repair can involve malfunctioning solenoids, though in some case electrical connections can break and need to be soldered back together.

The first tip to keep in mind when attempting nail gun repair is to ensure that the driving mechanism is not charged or loaded. A nail...

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by B.B. Pelletier

I got a request for this article last week from Manish in India and then another request to explain what is meant by the term valve lock, so I’ll deal with both subjects today.

There’s very little difference between the valve in a multi-pump pneumatic and a precharged pneumatic. Add air volume to a multi-pump reservoir and you can make the gun capable of multiple shots on a single fill of air. Then the only difference between that and a precharged gun would be the presence of the onboard pump. Therefore, the valve I will discuss applies equally to both types of pneumatics.

First, let’s look at a closed valve (graphic below). The reservoir is filled with compressed air that wants to get out, but the valve is blocking its way. Air pressure on the valve (red) presses it against the valve seat, which is a part of the valve body (black). The walls of the reservoir tube are also shown in black. A valve return spring inside the valve body also holds...

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