I am helping a blacksmith who purchased a Rand 4000 (RA5E6VA). He uses it quite frequently for long periods of time. The plastic tube that goes to the pressure switch from the inlet to the tank melts. What can be done to prevent this?

SOURCE: Air Compressor, low pressure

does the compressor keep running all the time but never gets above 40 or does it turn off at 40?
if it is turning off at 40 I would try using another gauge just to be sure it is 40psi, and if that is the case then you probably have a faulty pressure switch, if the compressor is constantly runnign but won't get past the 40psi then you may have a worn out compressor, check the oil for either a low level or if the oil is dirty, if it is you may just need to drain and refill but if that doesn't fix the issue then you will need to rebuild the compressor

SOURCE: Ingesoll Rand 4000

http://air.ingersollrand.com/manuals/Default.aspx

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thanks

SOURCE: I have an Ingersoll Rand compressor (RA5E6VA) 5 HP

that is just a compression fitting. Sometimes just replacing the tubing is enough to get a bit on it. If not you should be able to get another fitting from an indstrial supplier.