Question about Hitachi Air Tools & Compressors
-My air compressor runs and sounds great, but it only-builds air to 25 psi but no more. I checked the cylinder, piston, and rings and everything looks perfect. The only thing I noticed was that when the compressor is running air blows out a small hole located at the top of the oil fill plug, which I believe is done by design. The compressor will maintain 25 psi on the gauge overnight with no bleed down and it does not shut down since it doesn't ever build up enough pressure. Therefore, it runs continuously until I shut it down manually.
Your max pressure switch is faulty, and shutting off the power early. replace switch, check owners manual for location(should be near power wires)
Posted on Jun 14, 2009
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Posted on Jan 02, 2017
sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs
Posted on Mar 23, 2009
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