My bostitch 6 gal compressor keeps running , and running , even goes into a higherpitch motor noise. can i check something ? or clean something to fix it ?

could be a possibility. Clanking or rattling: Loose internal mounts can cause rattling and clanking from the compressor. The sound probably means that the motor has come loose and is moving around inside the sealed compressor can

https://www.amazon.com/Bostitch-Regulator-Manifold-AB-9415883-Pressure/dp/B00877CU92

Sources of noise from craftsman oil free compressors (could be Made by Campbell Hausfeld or Porter Cable) include loose fan, failing bearing/s on the piston rod and housing, failing seal ring on piston, air filter intake and loose motor mounts. With the housing cover off, check the fan blade for cracks or loose screw. Turn motor by hand till the piston is at top of stroke. Examine the cylinder for scratches close to top. If scratched, air is leaking past vinyl ring making noise and causing longer fill time. If everything looks ok, suspect noise coming from bearings. Hard to tell if bearings are failing by looking at them. I have seen many failures of the piston bearing on the crank (fairly easy to change, I use alternator bearing from auto parts ) , however, the bearing in the housing just behind the crank bearing is much harder to replacable. Good luck with your fix-it project.

Some of the craftsmen compressors have pistons that are coated on the top of the dome. Once the coating wears off, they have severe loud piston slap. If you continue to run it the way it is, it will snap the connecting rod in half or break the piston and possibly the cylinder.

Either the compressor is bad,but more likely the connector went bad or broke.

I'd pull the cover off to expose top of cylinder head and have a look at any intake air filter. In parts diagram, It appears there is a small one that would likely clog during the texturing process.

how i can replace bostitch compressor belt

PRESSURE REDUCER valve

Do you have a pressure relief valve. Take off the cover, make sure all fittings are tight and their is no cylinder head leak

There is a pressure relief valve somewhere around the motor. Make sure it is closed. If the relief valve isnt leaking air while the compressor is running you probably have a loose hose on the line going from the compressor to the guages or the overpressure valve. Something under the motor/compressor cover.