Mine had the same problem. One of the reed valves in the head had broken off due to metal fatigue. Take off black plastic housing with 5 screws along the bottom and one bolt under the handle (the front only). Unscrew the four allen headed screws on top of the compressor. Unscrew the discharge line from the head. You'll need part # AB-A640050 which is the valve plate assy. and possibly AB-9007012 which is the intake valve located in the top of the piston (if damaged). About $18 including shipping from Bostitch.
Had the same extact problem with my compressor. It would get as far as 80 psi and not go up any further and the motor kept running. LaMojoe was correct. The metal was erroded on the valve plate assembly and thus allowing air to flow through.Had the same extact problem with my compressor. It would get as far as 80 psi and not go up any further and the motor kept running. LaMojoe was correct. The metal was erroded on the valve plate assembly and thus allowing air to flow through.
Turn the gauge up to allow more air or try checking the drain plug on bottom of tank to see if it tight. If these 2 don't fix it check all connections for leaks.
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Mine had the same problem.
One of the reed valves in the head had broken off due to metal fatigue. Take off black plastic housing with 5 screws along the bottom and one bolt under the handle (the front only). Unscrew the four allen headed screws on top of the compressor. Unscrew the discharge line from the head. You'll need part # AB-A640050 which is the valve plate assy. and possibly AB-9007012 which is the intake valve located in the top of the piston (if damaged). About $18 including shipping from Bostitch.
Had the same extact problem with my compressor. It would get as far as 80 psi and not go up any further and the motor kept running. LaMojoe was correct. The metal was erroded on the valve plate assembly and thus allowing air to flow through.
Turn the gauge up to allow more air or try checking the drain plug on bottom of tank to see if it tight.
If these 2 don't fix it check all connections for leaks.