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Can't remove trigger valve from my Dewalt D51844-- even with lots of force, pulling with pliers

Gun won't fire after a few months in storage. I'm getting the puff of air at the trigger, so trying to replace trigger valve. I removed the trigger, but cannot figure out how to remove the trigger valve, which I read is supposed to slide out. Using needle nose pliers to try to pull it out, but not getting anywhere. Suggestions?

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  • 3 Answers

Have you tried a good soaking with a thin type oil like WD-40 yet?

Posted on Jan 08, 2013

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Posted on Jan 02, 2017

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SOURCE: NV65ah Hitachi nail gun "how do you remove the trigger piston"??

If you do not have a breakdown of the gun go here and select brand, then select coil nailer, finally look for your model number. With breakdown, find parts labeled 51 thru 54. The trigger pin (#53) and the retaining ring (#21) hold the trigger. Remove these then remove the trigger. Find several #51 roll pins on the gun and punch out the uppermost pin where the trigger valve is located (3mm size). The uppermost rollpin holds the trigger valve in-place. After you have removed the rollpin/s connect air supply to pop-out the trigger valve. Caution, use a heavy glove (or reduce pressure) to catch valve as it can come out with force. When incerting the rebuilt valve, use caution not to cut new orings as the valve is pushed in. Good luck and email if you have more questions.

Posted on Mar 15, 2009

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SOURCE: Makita AF503 Brad Nailer won't fire nail

Take head off of tool. Clean and lube orings on the head valve . Do not use wd40 use air nailer oil.

Posted on Apr 14, 2009

  • 109 Answers

SOURCE: dewalt angled finish nailer, just got, when nose

if air is released when the trigger is pulled then stops when the trigger is released , then the trigger is doing its job. its probably a firing valve issue. four screws will take off the top cap of the gun the firing valve is inside of the cap . first check to see if the gun has enough oil( unless its an oil less gun) if its dry then grease or oil all of the orings, if this dose not work check to see if any of the orings or plastic parts need replacing. pls rate this answer...;tks

Posted on Feb 16, 2010

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SOURCE: Dewalt D51822 nail gun does not fire nail. When

There are 4 orings that cause this problem. Two are in the trigger valve installed on the firing pin. The firing pin can be seen just under the trigger, however if you replaced the valve, you could assume no problems with the trigger valve. I would take apart the old trigger valve and examine the orings on the pin. The pin should fit snugly in the trigger valve cap and also in the valve. If the orings look good and it does fit snugly, most likely valve is still good. The other two orings to suspect are installed on the cylinder inside the nailer and make contact with the bulkhead (white plastic piece that seals the cylinder note parts reference 55, 74, 11 on the parts list). For parts list and to order parts go to Good luck with your repair.

Posted on May 27, 2011

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Dewalt D51238 not firing when trigger pulled but air does come out?

Remove the head and lube the headvalve with white grease. If gun still does not fire and makes air noise at the trigger valve then orings within the trigger valve are worn. Replace the trigger valve or if you have a source for small orings, just replace the two orings on the metal stem (2mm x 1.5mm). Dewalt uses vinyl orings on the stem that fail. Replace with buna. Good luck

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Hey, I'm having trouble with my Dewalt 18ga Brad Nailer trigger. Can you send me the directions you have on how to get into this thing? I'd really appreciate it.

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D51844 Framing Nailer won't fire

Adjusting the depth of the nail also changes the amount of pressure that is applied to the trigger pin. This is not actually a problem with the adjustment, however indicates that the orings in the gun are not completely sealing or is lacking lubricant. Adjust depth so that maximum pressure is asserted against the trigger pin. The trigger pin must be pushed all the way in very quickly to fire the gun. Test by removing the trigger and depressing the trigger pin by hand all the way in quickly. Enjoy

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