What should I do if the SB-1664FN fails to cycle?
Check for an air supply restriction, ensure the tool is properly lubricated with Bostitch Air Tool Lubricant, and inspect for worn head valve O-rings or a broken cylinder cap spring. Additional causes include a stuck head valve in the cap, which may require disassembly, checking, and lubrication.
From the official Bostitch SB 1664fn manual, page 12
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