DeWalt D51823 nailer leaks air and shoots continusously
Common problem with dewalt due to vinyl orings. Simple tests to determine if trigger valve may work before re-installing. With trigger valve in hand, depress the trigger pin and hold. The bottom of the inner spool is visable in the opposite side from trigger pin and should move inward slightly with little effort when you push it (spool should have almost no movement inward before making contact with body of valve ). If the spool moves inward 1/16 to 1/8 inch, most likely the oring is too worn and not making contact with body of valve (when under pressure, this spool is held against body of valve (closed), and will open when pin is depressed (firing pin pushes on the spring and spring pushes open the valve) ). Next take valve apart and pull out the spool (spool should be difficult to remove from lower body of valve). With spool in hand push upper part of spool into the cap, should fit snuggly. trigger pin has two orings. The upper oring should fit snuggly into cap and lower oring snuggly into spool. The two orings on the pin are made of vinyl and fail. Notice that the spool has a small hole at the bottom. If the pin oring s bad air will leak past pin. Replace with 2mmx1.5mm black oring. After replacing the two pin orings, make sure the pin fits snuggle in the cap and spool, if not , replace the whold valve. The spring is usually good, but if rusty, replace the whole valve unless you happen to have the exact spring in good condition. The two outer orings on the body of the valve do not have to be replaced unless cut. Good luck
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