Question about Hitachi EC12 Portable Electric 2hp Air Compressor, Oil Lubricated
The machine builds pressure fine, but when it reaches max (125 psi), it releases all but about 10 psi. I initially thought that the spring loaded pressure relief valve had went bad, but the air comes out of the small hole in the brass fitting below and to the side of the relief valve. I am not sure if this is a pressure sensor or not, but it has a small air hose from the tank the pressure switch. Any ideas?
The non-return valve is sticking and it's an easy fix. First, for safety, unplug the electric power to the unit and release any pressure in the tanks. Then unscrew the cap of the non-return valve (between the compressor and the tanks). Inside you should find a tapered rubber plug which is probably sticking in the valve housing. Sand down the diameter of the large end of the plug, being careful not to damage the flat face at the narrow end (which is the sealing surface). For sanding try 400 or 600 grade wet-or-dry paper and sand until the plug just moves freely in the housing. Reassemble and the compressor should work. Incidentally it's an oil-type unit, and quite durable. Make sure it has enough oil.
Posted on Nov 14, 2008
Thanks for the solution! Worked like a charm!
Posted on Mar 12, 2009
This was a great find, been having this problem for a while, but your suggestion worked. Thanks so much.
Posted on Nov 22, 2008
ACORDING TO THE MANUFACTURES SPECS ON THIS MODEL COMPRESSOR IT HAS AN OIL SPLASH SYSTEM AND I KEEP SEEING IT REFERED AS A CHEAP OILESS COMPRESSOR...IM TRYING TO DECIDE WHAT ONE TO BUY BUT NOBODY SEEMS TO KNOW WHATS WHAT AND NOW NOT SURE IF I WANT ONE OF THESE...
Posted on Oct 08, 2008
Yes, this is normal.
It is a safety valve.
Someone turned up the max pressure adjustment past the 125 psi limit.
Readjust back down to about 110 psi.
If it releases all the pressure after it kicks off (after building max pressure), then this is quite a common symptom of cheap oil-less compressors.
From your description you have a cheap oil-less compressor.
Posted on Oct 07, 2008
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Posted on Jan 02, 2017
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