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Re: air leaks from top of nailer
Is this broken o ring about the size of the cylinder? If so that would probably be your air leak. You can go to Stanleybostitch.com and look at a breakdown and also order parts. If youu give me the model number I will help you with numbers. While you are at it how is the piston o ring, does the piston stay where you move it to or fall down without any pressure. If it does you might want to think about all new o rings for the tool. Let me know
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Air leak through the top head exhaust port. • Nothing ... head valve or the seal located on the top of the cylinder (the part the driver ... Look to see if the piston top of the driver is aligned in the ... Solution: Remove and replace trigger valve (if.Missing: question
Keep your framing nailer in top working condition and save time and money with a ...O-rings that cause air leaks, a trigger valve that won't fire, or a leaking cylinder seal ...then replace the rings one at a time, matching each one to its replacement. Install the new bumpers, piston seals and piston stops and reinstall the cap.
The Check valve in top cover of nailer is in most cases the problem by this. remove this part and make fully clean if magnesium topcover use steel wool if its not smood and after that use a base silicon lubrication like Dow Corning dc4, OKS 1110 or Silubrin Kluber also this to protect the moving o-rings (because of heat and wear ) by oilless nailers use it but also by nailers with oil lubrication always in the top this valve on top must move easy and freely this part has also a little spring or a special spring element behind so to clean it inside it must allways be removed be carefully. the cilinder should have also a sealing ring that is maybe not tight enough on the top or is broken , remember that if its the first problem after a long time then use a complete service kit to service the nailer, thats better and you learn that the difference in old o-rings and new o-rings you will feel it because the old rings are hard and the new rings are soft in difference, and if kevlar piston is used its a oilless model , but is a normal o-ring there on the driver (piston)also there must be tacker oil pneumolube be used. the base lubrication is not enough for the nailer its going to be to hot on the cilinderrings inside.
But there are also little tackers with a muffler exhaust most behind there can be much close down of dirt.
Or the nailer is fully worn on the body because of a long time used without lubrication.
Leak out the head vent is usually caused by fine scratches on head valve (white plastic part in the head) and wear/ scratches on the surface where large oring of the headvalve makes contact with aluminum. Use fine sandpaper to remove scratches on aluminum head and replace the headvalve (white plastic part in the head). If the head has deep wear groove, replace head or sand and use oversize oring (or use Teflon tape under oring). Good luck
Edge with slots goes against the cylinder and the smooth top edge of the seal goes against the headvalve. Remove the headvalve and lube with white grease. You can save some money by using Ridgid seal #07902001013. Same part less money. Good luck
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.
The slp20 uses a firing valve part # ba0119 black plastic w/rubber boots. This valve is what prevents air from leaking thru top of gun. If pin hole has developed, or oring # lb0012 is not in place under the firing valve or if the retainer # bf0149 does not fit snugly on cylinder or has cracks, the gun will leak. Assuming oring is in place and retainer is good, suspect firing valve. Good luck
Your nailer has worn or broken o-rings in the top end. You need a rebuild kit (Senco part number YK0360) to get your gun going again. They are available through most online, after market parts stores. When you get it, remove and replace each seal and o-ring one at a time so you get them all back in their proper place and use all of the grease to lube the o-rings. Use all of the parts in the kit, if one o-ring or seal is damaged the others are not far from failing.
Air leaks from the bottom of nailers are due to leaking oring /s that seal cylinder to body of gun and/or leaking thru seal at top of cylinder where headvalve seats. Remove head and examine sealing surfaces of headvalve and top of cylinder. Must be smooth, then pull out cylinder and check oring/s that contact body of gun. Remove any fine scratches on inner body with fine paper (400 grit). Lube with silicone paste. Good Luck!
The most common problem with this nailer is the plastic seal that sits on top of the cylinder. This seal (ususlly white, yellow or black in color ) will cause the nailer to leak lots of air out top of gun. Examine seal for cracks and replace as necessary; the part number is 402725 and is available at www.toolpartsdirect.com This should stop the rapid air leak. After installing the new seal, if you have a very small constant leak out top of the gun then remove the screw holding the headvalve in place and check for small scratches where the orings contact headvalve. Use very fine sandpaper (300 to 400 grit) to remove scratches. Clean and re-use the same orings using silicone grease instead of oil and re-assemble. This should stop all leaks. Silicone grease is available at Lowes lumber in the plumbing department. It is used to lube orings in faucets. If you have more questions about this gun please email, Good Luck
Generally, air leaking from the nose of the gun is caused by the vinyl headvalve/cylinder seal. It is installed on the headvalve and snugs against the cylinder. I would also check the cylinder ring supporting the cylinder that is visable when the head is removed. The cylinder ring is made of white plastic and has an oring on outside edge and seals against the cylinder with another oring. The ring tends to crack allowing air out nose. Some cylinder rings were made of metal, which is better and do not fail. Metal or plastic, check the orings there. Not to worry, these parts are not expensive and available at www.bostitch.com. enjoy