I put a gasket kit in this well used nailer. The nailer will fire the first time but the piston driver stays in the down position and does not retract. If I retract it manually it will fire one more time and stick again. Any suggestions? Thanks, Bud
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Re: Dewalt D51822 fires once only
Hi Bud, This is a common problem as they get older. The mechanisms get a little worn and they pick up a lot of debris, especially the stick nailers. I have had an old bostitch for over 20 years and instead of rebuilding it all the time, I have taken to cleaning it regularly and taking it apart once in a while and wiping it with steel wool to check for any burrs and tiny pieces of the stick wire. The best results I have found are to wash it down with an engine degreaser and blow it out throughly with compressed air and then relube with pnuematic tool oil, especially the piston. Also be sure to put a few drops in the air inlet each time you connect it so it lubes the piston from the inside. Take out any nails and fire it several times onto a piece of wood to make sure the lube reaches everywhere. If you get a little too much inside it will spit it out as you nail but for framing that is not a big deal and I would rather have a little more than not enough. Good Luck, this should Fixya!
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Again sounds like blown O ring give it a squirt of 3in1 oil and fire it several times (if oil is compatible in your gun). Repair center if that doesn't work. Trash can also get in the air orifice and stop moving parts from moving.
Dewalt nailers use some orings that are made of vinyl (clear to yellow in color instead of buna or viton). These orings fail by getting soft and sticky. The gun may not leak but will not work correctly. The trigger should fire the gun when depressed about 1/2 way in. The oring repair kit has the same orings. I use generic orings in the gun to solve the problem. There are two orings inside the gun that should be changed and at least two on the trigger valve stem. In time the gun may fire a nail when you connect the hose. Check the internet for recall on some of these guns. The orings in the gun that should be replace make contact between the white cylinder spacer and the cylinder (smaller is standard oring # 141 the larger is 74.4mm x 3.1mm). The two rings on the trigger stem are 2mm x 1.5mm . If you do not have a source for orings then just replace the trigger valve. You also might try setting the depth adjustment all the way down. Good luck.
Dewalt nailers have some vinyl orings that fail. Usually found within the trigger valve, headvalve, and between the cylinder and cylinder spacer (white plastic piece). A dewalt nailer with failing orings may not leak air however. The vinyl orings tend to start to crumble and the tacky-crumbling pieces tend to create a seal. Easy way to check condition of the vinyl seals in a Dewalt is to remove the trigger valve and look at the orings on the firing pin/stem (2mmx1.5mm orings). If these two orings are soft and sticky, then orings inside of gun most likely the same. Check band on the outside of the cylinder (part # 390159-00) is what causes piston to return to top. But also check to too tight or too loose piston oring, bent shaft of driver and worn/ broken lower bumper. If all is well with internal parts and piston does not return to top, too much air is leaking past nose of gun. Oring kit sold by dewalt will contain most of the orings needed. The kit may not have orings for the trigger. You will at need two orings (2mm x 1.5mm) for the trigger valve stem or just replace the valve. Use white grease or silicone paste lube on all the orings. Good luck.
If your gun is over a year old, you may have failing orings. Dewalt used vinyl orings (yellow to gold in color instead of black rubber) in the gun that fail. The vinyl orings are installed around the cylinder and inside the trigger valve. The gun may not leak air, however will not fire. The repair kit has all necessary orings, however may not include the trigger valve. Good luck
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
Generally when the trigger makes a pop sound when you fire the gun and driver does not activate is indication of failed orings. There are two orings on the trigger firing pin and two orings on the cylinder that are made of vinyl and fail. All the other orings in the gun are black rubber like compound and last for a very long time. The two orings that fail within the gun are included in the repair kit and the trigger valve will most likely need to be replaced, or you could remove the valve and change out the two small orings (2 x 1.5 mm). If you would like to attempt repairs, email and I will give you detailed instructions. Main problem is that the replacement orings will be vinyl also and will not last very long. Good luck
Yes your problem right about lubericatoin try putting lite oil in it hopefuly you didn,t taer one of the seals but if you did just standard o rings and you can get them at a hardware store and the gun is easy to rebuild
Generally, when you attempt to fire and only get an air sound at the trigger, the problem is air leaking past the orings in the head valve. Here are a few things to check and a simple test.
Remove the trigger from the gun so that you can have access to the trigger pin. Remove the nails from the gun. After removing the trigger and the nails, reconnect the air supply (check for 100psi) Place the nose of the gun against wood and with a very quick ****, depress the trigger pin all the way in. If the gun fires then the safety foot is not allowing the trigger to depress the pin all the way in. Make adjustments to safety and check for worn trigger and trigger retainer pin. If the gun does not fire, remove the head. Place the head on table and depress the headvalve all the way in with your thumbs then place a finger over the small vent-hole on the gasket surface and release thumb pressure. The headvalve should remain depressed due to vacuum in the valve and will pop up when you remove your finger on vent hole. If the headvalve does not stay in, air is leaking past the orings. Remove headvalve parts and use magnify lens to find small scratches on the surface where orings contact. Remove scratches with very fine sandpaper (300 - 400 grit) Make sure all the orings are not cut (use magnify lens) and fit snuggly. Lube with "Danco silicone grease" available at lowes in the plumbing department. It is used to lubricate orings in faucets. After re-assembly, do vacuum test as described above. If you have vacuum, head is ok. Make sure that the gasket seals around the vent hole where the head mates against the body. You should be good to go. Good Luck and email if you have other questions.