Have a leak from the small hole in the relief valve?

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Hitachi Air Compressor EC12

The Hitachi Air Compressor EC12 is a portable, lightweight device that supplies compressed air for small home, shop, and hobbyist uses. This page provides repair and detailed information about its 1.5 HP pump, 11-gallon twin stack air tank, and its ability to deliver 5.0 SCFM at 90 PSI.

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west40texas @west40texas

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게시됨: 2025년 4월 24일

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Have a leak from the small hole in the relief valve?

I have an Hitachi EC12 compressor & I am having an issue with a blow out of pressure before it reaches completion of its cycle! I thought it was the blow back valve & replaced, but now found that it is leaking from the relief valve that connects to the back of the pressure switch and then has a hose that runs to the non return valve.

Thank you for your time

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jayeff @jayeff 평판: 522.1k 11 398 1.5k · Answer 1 · 2025-04-25T01:11:09-07:00

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jayeff @jayeff

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Hi @west40texas

The hose is part ID #52 Hitachi part # 881-675 (supplier example only to show part) as seen in the parts list for the compressor, which shows that it goes to "A", but there's no other indication where "A" connects to.

I think it may be part ID #64 Hitachi part # 881-493 (supplier example only to show part)

If you think that it may be the one, search online for Hitachi 881-493 to find suppliers that suit you best.

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Hitachi Air Compressor EC12

Have a leak from the small hole in the relief valve?

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