Jun-Air Compressor Fault

[jamesgates1000]

Thanks for the quick reply m_c sorry I only just had a chance to reply, got a replacement compressor and just left the other to get some rush jobs done. When I said it tries to start, it makes a noise, the light comes on but doesn't start the motor. My compressor doesn't have any of the top pieces that you mention, I have attached a couple of pictures,
think that the unloader valve might be inside the pressure switch.


And now I have problems with the tool changer not indexing either! I'm sure problems always come in threes so just waiting for another!

[m_c]

Ah, that looks like an old screw compressor.

Could be the start capacitor has packed in, so the motor isn't producing enough torque to get started. You would have to strip the compressor down enough to find the capacitor(s), then try changing them.

[jamesgates1000]

The motor will start when the compreasor is switched on with no air in the tank, just doesnt top up quick enough to stop the machine alarming out at low air presuure.

[magicniner]

Is the over-length nut that's part of the connection to the cylinder just a nut that's bigger than it needs to be or might it contain a one-way valve?