Runs shuts off when it reaches max preasure won't release head preasure
The head pressure is released thru the needle unloader valve at the pressure switch. Notice a 1/4 inch plastic tube (or metal) running from the intank check valve to the pressure switch. After pressure switch reaches set pressure a small tang moves up and presses on the needle valve releasing the pressure. Only a small amount of air will be released. If however air continues to escape from the needle valve, then the check valve is bad.
SOURCE: hitachi ec89 will not shut off
IF it is building up to the correct pressure then the pressure switch has malfunctioned. The part number for a new switch is 160580.
Parts and owners manuals are located at this link near the bottom of the page;
Hitachi EC89
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