Question about Dewalt Heavy - Duty 31° Clipped Head Framing Nailer - D51822

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Dewalt 51844 round head nailer

When i pull the trigger air leaks around the trigger area. Just got it out of the shop but still doing the same thing.

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Could be a couple things, the seal ring on top of the cylinder or a cut oring or just a faulty trigger valve assembly. I would take it back and have the repair shop correct the problem for you at NC. Let me know if still a problem and I will look at a schematic and give you part numbers.

Posted on Feb 17, 2009

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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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Shooting continusously caused by worn orings in the trigger valve and in the gun.Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer (white plastic). Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. The trigger valve also has vinyl orings on the trigger pin. You could try replacing the orings but hard to find . Pin uses 2mm x 1.5mm. The orings on the inner valve should fit snuggly on the outer contact surface. If the valve just falls out the the body, the orings are too loose or the body is worn. I would just replace the trigger valve to be safe, however repaired works ok if you can find the orings. Trigger orings do not come in the kit. I would also remove the nails after each use and only reinstall them after air is connected and gun seems to work as it should. The Good luck with your repair.

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Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer. Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. Good luck with your repair

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You could have broken internal parts but more likely you have broken or worn o-rings inside the nailer. You can go to the Dewalt service site at, http://servicenet.dewalt.com/, search for your model number and get a good breakdown of the nailer and order the parts you need to rebuild it. If you replace any o-rings, replace all of them.

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Dewalt uses vinyl looking orings that begin to just melt, unlike the black rubber orings. I usually replace about four orings within the gun and two within the trigger. Remove the head and pull out the cylinder by gently prying up on the white cylinder seal. Place the cylinder on workbench with bottom side up. Take picture to the unit or draw diag. with placement of parts. Push down on the spring loaded retainer and remove the oring. The orings that you need to replace are under the white cylinder seal. Larger is 75mm x 3mm (or 74.4mm x 3.1) , smaller is universal oring # 141 (58.42mm x 2.62mm). There could be other failing orings in the head (vinyl orings will look streached out if bad, but do not need to replace of good) . The two orings in the trigger are also vinyl and fail often. Replace with 2mm x 1.5mm or measure because of many different trigger valves (or replace trigger valve, not expensive). Good luck

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Dewalt uses clear vinyl orings in the trigger and around the cylinder between the bulkhead. These orings do not hold up. They should be replaced with black rubber type to solve the air leak problem. Replace tow orings on the stem inside the trigger valve ( 2MM X 1.5MM). Replace two under the bulkhead against the cylinder (larger one is 74.4MM X 3.1MM, ((smaller is 58.4MM X 2.6MM or universal oring number 141)) ).

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1 Answer

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I had a similar problem with one of my nail guns. What I found was a small rubber o-ring in the trigger mechanism had split. Once I replaced this the problem was corrected and the unit functioned fine.

You could replace the whole trigger assembly for about $35. But if you remove the assemble and replace the split-ring this would only cost a couple of bucks at most.

Trigger assembly shown below. ereplacementparts.com is one possible source for the trigger assembly others can be found on the Internet.

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