Is there pressure in the tank already? The reset is usually on the end of the motor.
The pressure switch, a diaphragm pushes against an adjustable tension spring. Less spring tension cuts the motor out at lower pressure, more tension at a higher pressure. Has this adjustment been used? It may have a second adjustment, either nut or screw, that adjusts the pressure differential between cut in and cut out.
SOURCE: need help wiring new pressure switch for craftsman air compressor
Assuming that you are wiring for 115v. Lets start with the ground. The cord that attaches to the wall outlet will have three wires, green, black , and white. Insert the cord thru one of the openings of the pressure switch and attach the green wire to the ground screw. Next look very closely at the contacts and notice that they are arrainged in pairs. There is a small brass bar with two contacts that completes the circuit for each line. Start with L1 and attach white wire from cord, then attach white wire from motor to the screw terminal that small brass bar bridges to (should be T1). Next attach black wire from cord to L2 and black wire from motor to remining screw. Remember that the small brass bar with two contacts is the bridge and simply connects white to white and black to black. Enjoy
SOURCE: 1 HP 3 Gallon Air Compressor does not build up pressure.
it sounds like the regulator is out of whack turning down increases air pressure. make sure there is no leaks
SOURCE: How do I Reset the pressure switch to kick in
the pressure switch is generally set from the factory, but if you are brave and have some free time it can be done
Take the cover off of the pressure switch, and you will see the contacts. What you will have to do is loosen the nuts on the threaded shafts equally a little at a time until you reach the pressure that you want.
Not something i recommend, but it can be done and done safely. REMEBER TO UNPLUG IT SO YOU DON'T ZAPP YOURSELF!!!!!
SOURCE: I have 12 gal.1hp craftsman mod.921-166400 won,t
I would have to say if you are blowing oil out the crankcase that you have a piston or rings problem
SOURCE: motor runs pressure stays around 25psi
if they are oilless compressors then the rings are worn
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