STARTED COMPRESSOR UP...PRESSURE BUILT TO AROUND 70PSI, THEN COMPRESSOR SOUND CHANGE AND PRESSURE WOULD BUILD NO MORE PRESSURE. ONCE THE PRESSURE WAS RELEASED NO MORE PRESSURE WOULD BUILD. AIR SEEMS TO BE RELEASED THROUGH THE BREATHER.
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Re: WILL NOT BUILD PRESSURE
Many craftsman compressor are built by champbell hausfeld using a dry type of cylinder and piston (no oil, no crankcase). If dry type, check for worn cylinder and piston ring. Pieces of the vinyl ring can jamb between the reed valves in the head causing air to escape from the intake. If your compressor has a crankcase and oil, check for broken reed valves in head. Spray soap solution on hoses, checkvalve, drainvalve, and fittings to check for leaks. Most likely problem is reed valves broken or open. Parts are available from sears or match parts to chpower.com. enjoy
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I can not find a Craftsman compressor with that model number anywhere so here are a couple things to look into. If the compressor fills to 70psi and keeps on running check the valve plate and piston/cylinder assemblies. Check that the valve reeds on the valve plate are not bent, broken or warped from heat. Then check that the wiper (oil less) or pistion rings (oil splash) are not damaged and that the cylinder wall is not scarred up. Any of these will let the compressor fill up to the point where the air pressure leaks past the valves or piston and won't fill any further. If the compressor fills to 70psi then shuts off the problem is in the pressure switch. Some have an adjustment screw or bolt to control when it turns on and shuts off. If you had a drop from 100 to 70 the springs may be weak or broke and you'll have to replace the switch.
First take off the head on the air pump and check the reed valves on the valve plate. If they got hot and warped or cracked they'll work to a point then no more pressure can be built up. Next check the pistion ring and cylinder wall. If either is damaged you'll only get so much pressure build-up then it will leak past the piston.
It sounds like the problem that you are having is with the unloader if there is only 30 to 40 pounds of air pressure in the tank it would probably start,but if the pressure is around 90 pounds it would be starting underload, the unloader should exhaust the air from the compressor so it does not have to start underload the unloader does two things it works the magnetic switch to turn the compressor on at probably around 90 pounds and off at about 120 it usually uses 120 V to work your magnetic breaker that uses 240 V I hope this helps.
Sounds like the pressure regulator has gone bad. That controls how much PSI your system is aloud to have. If this fails it will not fill to max capacity. I would replace that and all will work just fine.
sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you