Question about Dewalt D51844 Framing Nailer

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D51844 nails jam

The problem is that the driver is not returning to the full upright position and the nails are pushed into the driver causing the jam. I have replaced the driver and orings but can't figure out why the driver stops about 1/2 " below the top position. I can't find any info on the stages the nailer goes through to cycle or I could probably figure it out.
Thanks,

Woodbinder

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Gun keeps shotting out nails when connecting the compressor line without pressing on the trigger. I even removed all nails and is still doing the same thing. Can you help?

Posted on May 02, 2011

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The problem that you are experiencing could be caused by several conditions within the gun. Lets work thru the possibilities. First make sure that the nails are correct for the gun. Place a stick of nails on the outside of the magazine with the first nail aligned with the path of the driver. The stick of nails should align perfectly with the path of the driver and also with the magazine. If they do not, don't use the nails. Check with dealer for correct nail. I find that short nails (around 2") will have a tendancy to jamb.
The driver will not travel to top of cylinder if the driver oring/ring is too worn or the driver is bent. The driver should fit snug into the cylinder but be able to travel rather freely . At the bottom of the cylinder check that the bumper is not missing pieces or is cracked. Some nailers have a washer below the bumper that fits snugly around the driver shaft. The bumper and washer prevent too much air from leaking down thru the nose and helps to push the driver back up to top. There is a check valve around the med section of the cylinder that is what actually caused the piston to return to the top with force. You must remove the cylinder to check. Parts are available at www.toolpartsdirect.com. There is also a rebuild kit for this gun. Enjoy

Posted on Dec 14, 2008

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2 Answers

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Assuming that the gun will not jam with nails removed and the driver returns to top of cylinder when fired without nails. If the driver is bent the nailer will jam without nails. Jamming is usualy caused by bent driver, driver tip worn (not square), or wrong nails. If the driver is not bent and the tip is square, suspect wrong nails. Easy test. Place a strip of nails on outside of rails with the nail heads aligned with top of rail. Move the strip of nails toward the nose if gun. With the heads aligned with the top of the rail, the first nail should align with the path of the driver. If the first nail does not align with the path of the driver and the head is angled slightly away from the path of the driver, the driver may strike the shaft of the first nail pushing the nails back into the rails. If the head of the first nail is forward with the nail shaft angled back away, the nail will flip causing jam. The first nail should align with the path of the driver to prevent jam. It is difficult to find perfectly made nails that align correctly. But certainly check the nails with test mentioned above with every new box for accuracy. You might find that you will need to change brands to get a good fit. Good luck.

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http://www.mazenails.com/catalog/catalog.php?page=PAGE04&group=PT34

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1 Answer

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