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Re: dewalt 51844 round head nailer
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.
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Leak around trigger could be trigger valve internal orings or orings on the outside of the trigger valve making contact against the body of the gun. Spray soapy water to determine where the air is leaking from. If air is leaking around the outside of the valve, most likely the orings were cut upon installation of the valve. If leaking from internal valve, most likely worn or broken oring; easy to fix if you have a source for orings.
To remove the trigger valve for service or inspection (take close-up photo of trigger area for reference ): disconnect airline, remove nails, remove trigger retainer pin, remove trigger, remove roll pin /s holding trigger valve in place (use 3mm punch to remove retainer roll pins which are located in the body of the gun just above the trigger valve). With retainer pin/s removed and with gloved hand (under trigger valve), apply air pressure to gun to blow out the trigger valve (use lower pressure to push out trigger valve because it could come out with force.). With trigger valve in hand notice that there are two slots or groove cut neer top of the valve where the retainer pins rest, you will need to reinstall valve into body with slots aligned to retainer pins. Remove retainer pins holding trigger together to pull out internal valve. Good luck and post again if your have other question about the trigger valve.
No model number given for specific solution, however, the problem that you describe is caused by air leaking past the orings in the headvalve or head gasket(you will not hear air leaking out of the gun, air is leaking between pressure chambers) or the safety foot is not pushing the trigger pin all the way in. Easy test. Remove the trigger and manually depress the trigger pin in very quickly. If the gun fires, adjust safety foot. If gun does not fire , remove the head and pull out the headvalve. Look for small scratches on the surface where the orings make contact to the head. Remove fine scratches and lube with plenty of white grease and retest the gun. Good luck
Air leaking around the trigger area could be caused by vinyl ball / gasket under trigger valve bushing or orings within the gun. Easy test, remove nails and connect air (assuming that air is now leaking around the trigger area). Depressing the trigger stops the leak, replace vinyl ball. Depressing trigger does not stop leak, move plunger b (plunger B, small shaft under bubber bushing next to the trigger valve) with your finger in then out to determine if air leak changes tone. If air leak changes sound or tone, then air is leaking past orings of the cylinder guide and/or cylinder plate and/ or the cylinder itself is scratched by debris where the orings make contact. Pull out the cylinder and examine the contact areas. If scratched, use 300 grit paper to smooth, if smooth, however, suspect the orings of cylinder guide (or cylinder guide is cracked). The cylinder guide is difficult to remove and install without causing damage to guide or cutting new orings when installing. Do not remove the guide unless all the other options have been checked. One last bit if information, I have noticed that some guns will leak air if the orings on the feeder piston do not fit snuggly. Make sure that leaking sound is not coming from feeder area (remove the basket and feeder/feeder pin/spring and pull out the feed piston, making sure that the largest oring is making good contact within the cylinder). Good luck with repair.
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
Two areas to check when air leaks from around the trigger. Rubber ball under trigger pin will cause air to leak, however when good side of the ball falls on the seat, air will not leak for a while. If air is leaking from plunger pin (just in fromt of the trigger pin), remove the head and pull out the cylinder plate to reveal broken oring (oring part # 876161). Good luck with your repair project.
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)) ).
For removal of dewalt D51238k trigger valve. Remove the nails.
Remove the pin holding the trigger in place. Then remove two roll pins in the body of the gun just above the trigger (3mm roll pins). With gloved hand, apply air pressure to the gun which will pop out the trigger valve. Use caution because the valve could come out with force. Try with low pessure first, then increase as needed. If you are removing the trigger because the gun will not fire, (only puff of air from trigger area), suspect problem in the head valve instead (usually, trigger valve is bad if air leaks from trigger when you connect air ). Good luck
There are two areas around trigger that can leak air. Spray soapy water on trigger stem and/or plunger valve. If leak is at trigger stem check vinyl ball. If leak is at plunger valve, most likely worn or broken oring inside of gun. Remove head and pull outer ring to reveal two orings. A worn outer oring will cause leak at plunger. If orings are ok on outer ring, pull cylinder and check for scratches where orings contact. If scratched, sand with 400 grit paper untill smooth and repack gun with oring kit. Good luck.
There is an o ring that seals the valve that is operated by the trigger. It sounds like this oring is defective, or missing. Home depot or lowes should have no problem returning this for you if it is less than 90 days. it is fairly complicated to disassemble.