It cranks good and runs good till the compresssor builds up pressure then it just shuts down.
SOURCE: coleman compressor no build up of pressure
your correct either the valves are worn or maybe just need cleaning as for the gaskets,idont know what part of the world your in but check out coleman on the internet or failing that ,i have maid these from gasket material suuplied from my local bearing supplier
SOURCE: Gas air compressor shuts down
IS IT BUILDING TO THE UNLOAD PRESSURE AND THEN STALLING OR JUST SHUTTING DOWN ANYTIME. IS THE UNIT SITTING AT AN ANGLE?
DOES IT WORK FINE WITH THE LOW OIL SWITCH UNPLUGGED? UNPLUG SWITCH AND LEAVE IT UNPLUGGED FOREVER.THEY'RE ALL P.O.S.
SOURCE: air compressor fills, but slows down as the pressure builds
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
SOURCE: Mastercraft 2.0 hp air compressor will not build up over 25 psi
sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs
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