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I purchased a kit from professor foam on ebay and installed it. The nail gun is still shooting air out of the tip where the nails come out. Dewalt D5188 type 1

I did find one shredded o-ring when I took the gun apart. With the kit I got it doesnt seem the the gun is getting a good seal around the bulkhead /cylinder spacer. I have a type 1 dewalt D51844. The plastic bag the kit came in does have my model number on it. Only one of the only rings that go under (inside) the bulkhead is the clearer color. Both of the ones I removed were clearer. Also I seem to have one o ring left over. Maybe that is because one of the other models or types takes an extra one ring. Please advise. The only other option I can think of is to pull the trigger out and check those o rings. Im just not finding info online that would indicate those o rings as the problem I am having. The gun does shoot nails but they only drive in half way 5do to the loss of air out of the nose of the gun.

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Posted on Jan 02, 2017

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SOURCE: Dewalt Nail Gun D51844. Same problem as other guy

Dewalt uses about 4 or 5 orings within the gun made of semi clear urethane that fail (turn gummy and breake apart). Two are under the bulkhead and at least two in the trigger valve. To remove the bulkhead pull up on the white housing. With housing and cylinder assembly out, push down on the black retainer at the very bottom and remove the oring(take a picture of the assembly after each stage so that you can re-assemble the spring and checkvalve correctly). You will find two large orings under the bulkhead against the cylinder that need to be replaced (also the orings in the trigger, or replace the trigger valve ).

Posted on Oct 06, 2011


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