The model you are using is only rated for 120 psi that could be part of the problem, at 140 psi you have all ready exceded the max load on the psi regulator. You can adjust the regulator so it will turn off at 120 psi and then it would not put a strain on the compressor.
SOURCE: low air pressure
Take the compreessor apart and clean the reeds with a piece of emory cloth, this shoud help.
SOURCE: air compressor not working
If your motor is running and not the pump, the malfunction is either in the pump or the coupling between the motor and the pump.
Some of these compressors are manufactured so cheap now that there can be just a set screw that is loose and the motor shaft is spinning free inside of the crankshaft.
If you drain the oil out of the pump and take off the pump crankcase cover, you should be able to see the problem.
SOURCE: No psi
A louder motor usually means that it is running at a higher rpm. The most likely problem is bad seals around the compressor pistons. Once there is enough resistance to the seals they will begin to fail. As for a manual the best place to check is a CH authorized repair shop. Sometimes your local lawn mower shop will be able to assist you with parts help
SOURCE: Air compressor motor stalls under pressure
this sounds like a bad pressure switch.if the unit is not shutting off at the same pressure each time this would be the cause.2 if the pressure is not unloading the air pressure on the compressor side of the unit it will cause the unit to struggle when it starts a cycle because the piston is under a load .how this works is say the unit starts from 0 psi when it get to the desired pressure you have it set on the unit kicks off . the other adjustment most units have on them is what pressure to cycle back on.so when the unit reaches say 100 pounds ,it kicks off and bleeds the air off the compressor side so when it starts back up it wont start up with pressure on the piston.
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