SOURCE: BostitchCAP60-OF won't pressure up past 95lb and keeps running
This comperssor is oiless thus has a vinyl piston ring that wears quite fast depending on use and conditions at the work site. Slow pressure build or cycle never completes indicates a worn cylinder and piston ring. I would replace the cylinder, piston ring, valve plate, and intake valve. These parts are not expensive and available at www.bostitch.com. enjoy
SOURCE: bostitch air compressor cap 60p-of
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.
SOURCE: Problem with Bostitch air compressor Rilsan tube? Low pressure!
THE PRESSURE SWITCH HAS A RELIEF VALVE ON IT THAT DRAINS THE PRESSURE WHEN IT ELECTRICALLY SHUTS OFF. IT HAS A LEVER STICKING OUT THAT HITS A "SCHRADER" VALVE. COMMONLY KNOWN AS A "TIRE STEM" IN ANY VALVE STEM IN THE TIRE ON YOUR CAR. THIS VALVE COULD BE BAD OR THE LEVER STICKING OUT COULD BE BENT PRESSING ON IT ALL THE TIME. I WOULD REPLACE THE PRESSURE SWITCH, IT WILL FIX BOTH OF THESE PROBLEMS. TAKE YOUR SWITCH WITH YOU TO ENSURE YOU GET THE SAME THING (SIZE, PSI RATING, ETC) HOPE THIS HELPS. JODY
SOURCE: I have a Bostitch CAP2000P-OF 6 gal compressor.
Something is wrong with your "unloader" I should think. That is the device that removes the pressure from the cylinder so the machine does not have to start up against its full air pressure
There will be a narrow air pipe connecting the compressor to the switch assembly which bleeds off the air when the power is off. That hiss you get when you turn it off or it turns itself off.
I think you will find a leak there or possibly the non return valve that stops all the air escaping when the unloader valve is open has failed or got a foreign body stuck in its seating.
SOURCE: Bostitch 6 gal compressor regulator knob is broken
Call Bostitch At 800-556-6696 and they will send you a free redesign part #27. It was a bad design part and I just did it a minute ago.
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