Dewalt Mk246 won't run. , It's Brand Nu was

SOURCE: I have a campbell hausfeld 2 gallon 135 max psi

No Fuse However this model is known for having the switch go bad. You can check it with a meter or Continunity tester with the unit unplugged

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SOURCE: Dewalt/Emglo D55155 compressor screeching and breaker blown

Sounds like it isn't getting oil on the bearings. Take it apart yourself,after you get a diagram of it and find a parts source.

SOURCE: I have an older electric air compressor that says

depending on the compressor you might have a bad inlet or outlet valve. some have reed valves and also spring loaded disc valves. you could try un hooking head line to tank and put your finger or a peice of thin wood over the line ande see if you have pressure coming out of the line. if not, could b e valves or unloader, or belt slipping from motor to compressor pulley .

SOURCE: 33 gallon verticle, very seldom used, I would call it brand new! Pump won't turn on.

with the power off clean the contacts on the pressure switch

SOURCE: Have a 919.167240 that won't go over 60psi. No leaks, the check valve is working. Motor keeps running and I need to shut it down manually.I removed the compressor and checked the head and housing,

If all is well where you say it is the next thing I'd check is the condition of the piston & cylinder then the valve plate. On oilless compressors it's common for the ring on the piston to get worn or have peices come off. It may or may not damage the cylinder but it will be able to compress air until the pressure is too high for the leak past the piston to overcome. Also if the valve plate got overly hot the reed valves may warp or break off, again letting the pump compress air only to a point then the internal leak will prevent it from getting high enough for the motor to stop and cool down.