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Old 04-03-2011, 03:31 PM   #1
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Bostich air stapler T50S4 won't fire


I have a lightly used T50S4 that won't fire. When aired up, and safety depressed, the trigger only makes a popping noise with no driver action. I have it apart, none of the parts appear to be broken or worn. I had it rebuilt once at a shop, and now it is back up to the same problems. Unfortunately I don't recall what repair the shop performed. Any suggestions, like buy Hitachi, etc.

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Old 04-03-2011, 11:02 PM   #2
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Bostich air stapler T50S4 won't fire


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Originally Posted by packrod4wt View Post
I have a lightly used T50S4 that won't fire. When aired up, and safety depressed, the trigger only makes a popping noise with no driver action. I have it apart, none of the parts appear to be broken or worn. I had it rebuilt once at a shop, and now it is back up to the same problems. Unfortunately I don't recall what repair the shop performed. Any suggestions, like buy Hitachi, etc.
If you try another air gun, does it work?
Do you have an independent device to measure the air pressure coming out of the compressor?
Ron

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Old 04-05-2011, 10:50 AM   #3
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Bostich air stapler T50S4 won't fire


maybe putting some light oil in the gun may help....
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Old 04-05-2011, 10:57 AM   #4
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Bostich air stapler T50S4 won't fire


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Originally Posted by fybountyhunter View Post
maybe putting some light oil in the gun may help....
It would need to be pneumatic tool oil.
Ron
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Old 04-05-2011, 10:20 PM   #5
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Bostich air stapler T50S4 won't fire


Thanks for the reply, air pressure was adequate, in fact I tried it with two different compressors. I'm just being cheap, don't want to invest $ in an older gun if the problem keeps repeating. It is a 16 ga., 1/2" crown construction stapler, most new construction staplers I believe have gone to 7/16" crown and the staples are cheaper as they are more common.
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Old 04-05-2011, 10:27 PM   #6
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Bostich air stapler T50S4 won't fire


Thanks Ron. I did oil the stapler (I used Senco gun oil, not sure if this is a problem), and when I took the gun apart all the sliding parts seemed to be well lubricated. I'll go lube it again and re-assemble it...I just don't want to throw parts ($) in it when I don't understand the problem yet.
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Old 04-21-2011, 11:59 AM   #7
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Bostich air stapler T50S4 won't fire


The trigger valve may need to be rebuilt with the correct internal o-ring (flat on one side and beveled on the other) if you can find one or just replace the entire valve with a new one. I tried rebuilding mine with a 25 cents o-ring because the OEM o-ring seal is not available. It stopped the leak but is exhibiting the same symptoms as yours. It looks like I will have to replace the entire valve (about $20).

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