Stanley Bostitch manufactures five tools that it identifies as nailers and a sixth that it calls a nailer/stapler. A knowledge base of answers to frequently asked questions on Bostitch's website includes several that enable owners of nailers to troubleshoot problems.
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Failure to Return
Sometimes the pin or driver remains in the nose of the nailer after driving a nail. If the driver does not return at all, Bostitch advises replacing the trigger valve assembly. If it returns partially, but not enough to allow advance of fasteners, any of three O-rings, the lower bumper or the check seal may be faulty.
Lack of Drive
A nailer/stapler that seems weak and no longer fully drives the fastener might indicate a problem with the piston stop. Other possibilities include a worn cylinder cap assembly, a worn cylinder sleeve, loosened driver threads in the piston and insufficient air pressure. A tune-up, Bostitch says, often resolves the problem.
When a pneumatic nailer bends nails instead of driving them straight, Bostich says, the cause is likely worn O-rings or insufficient lubrication. It recommends cleaning the nailer's interior, replacing the O-ring and trigger valve assembly and applying O-ring lubricant. A worn driver, loose driver threads or low air pressure could also result in bent nails.