This is a manufacturer sourced replacement part designed for use with Senco staplers. This is one of the seals for the valve. Over time it will shrink, become brittle and crack allowing for air leaks. At that time it should be replaced. It is made out of rubber material and it is sold individually. Replacing this item you would need hex key/allen wrench and pliers to replace this item.
Removed the four top cap allen screws, blew all the pieces of old retainer from nailer body, replaced seals and retainer not using any tools, then reassembled nailer.
Using a 5mm hex wrench, remove the four screws from top of the nail gun. Be a little careful, as there is a spring in the assembly that will push the top of the gun off. I used a schematic I printed from the Senco website to identify the broken parts and determine the correct reassembly order. Otherwise, just remove one o-ring or seal at
... Read morea time and replace with the one from the kit. It seems that this kit is designed for multiple tool models so you will have a few parts left over. The challenge in the reassembly was figuring out that large outer seal on the aluminum chamber had to be installed in the gun body and the tube the installed.
Disassembled nailer. Replaced all the broken parts. Replaced the o-rings, found that 2 of the o-rings were the wrong size from the kit. Got the correct o-rings. reassembled the nailer and it failed to work. I did follow the instructions in the kit. Still have the nailer on the bench working on the 3rd tear down.
1) Removed the 4 X 5mm Allen screws on the top.
2) Removed the piston, it had 2 seals cracked.
3) Replaced them with new ones.
4) Assembled back the piston.
5) Closed up the top with the 4 Allen screws.
Removed the end cap of the gun, pulled up the piston/driver and replaced the seal on it. The replaced the seal on the valve. Oiled the inside of the gun. Then reattached the top cap. No more leaks.
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_WW_1.gif "Part Location Diagram of LB3505 Senco Seal")
_WW_1.gif "Part Location Diagram of LB3505 Senco Seal")
