Hitachi Air Tools & Compressors - Answered Questions & Fixed Issues
How do I remove the cover on my Hitachi air compressor
First, you have to determine how it is attached usually they are screwed or bolted into place or simply held into place by clips or pressure. But there are many different models so please post the model of your machine so it can be identified or even a photo.
9/21/2022 5:19:13 PM •
Hitachi Air...
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Answered
on Sep 21, 2022
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454 views
Why won't my ec12 air compressor won't start
Check the circuit breaker reset located under the shroud above the dipstick.
If the unit hums but won't turn, first drain the air completely and then try it (If it starts, your problem is most likely the check valve located on the tank)
2) Unplug it and carefully use a thin screwdriver to turn the fan blade - if it spins and is not bound then try it again.
If it still doesn't start I would look at the start capacitor located under the shroud
3/3/2021 2:21:22 PM •
Hitachi EC12...
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Answered
on Mar 03, 2021
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506 views
How do you remove piston cylinder to change o ring
Easy to remove the cylinder and piston/driver. Remove four head bolts and lightly tap head to release gasket. Push out driver by inserting rod thru nose then remove spring retainer holding the cylinder in place.. With retainer removed the cylinder should pop out. Sometimes the retainer will cause a bur to form on the body of the mailer making it s bit more difficult to remove. Good luck
Ec 12 Hitachi air compresser not building up air pressure
So the first (most obvious but sometimes overlooked) thing - check to make sure the tank drains are closed.
Listen for a leak at the pressure switch - it will continue to leak after the compressor shuts off. If this is the case then you need a check valve (Part # 53A on the breakdown)
If it builds pressure but not enough to shut off and there are no leaks I would look at the valves located in the head (Part # 14 on the breakdown) - piston rings are not a normal failure part on this model but could also cause this.
2/2/2019 6:12:21 PM •
Hitachi Air...
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Answered
on Feb 02, 2019
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846 views
Compressor not releaving 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.
1/21/2019 4:32:10 PM •
Hitachi EC12...
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Answered
on Jan 21, 2019
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477 views
Air pressure on my air compressor
This problem is usually caused by reed valves or blown gasket between head and valve plate. Easy to check. After the compressor reaches 45 to 50 psi, with compressor still running, remove the air filter and feel for good suction at the intake port. If the air seems to be blowing out of the intake, then valves are bad. If you feel good suction at the intake, then air is leaking from the discharge tubing or other fittings. Good luck
1/21/2019 4:26:22 PM •
Hitachi Air...
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Answered
on Jan 21, 2019
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302 views
How do i replace pressure reducer of a hitachi ec119sa air compressor?
The pressure regulator can easily be replaced by removing the large plastic decorative cover. The manifold behind the cover is the part where the regulator , gauges, and quick connects are attached. The manifold is fed air from the pump via a plastic hose connected to the pressure switch. The regulator sells for about fifty dollars. This part usually fails in two ways. It leaks air from the knob or no air pressure will reach the quick connects. If your problem is no air at the quick connect, you can do a temp repair by removing the safety valve and installing a tee fitting at the port. On the tee fitting reinstall the safety valve and a quick connect on the other fitting. This will give you tank pressure . Good luck.
Where is the.reset button
The reset button is located under the cover visible from the dipstick side of the pump, however, if there is no visible button, then the reset is incorporated within the windings of the motor. The reset hidden in the windings does fail and can be eliminated with much effort. If the motor is cutting out for no apparent reason and comes back on after it cools or if the unit will not power on and all components test good, then suspect internal reset. The internal reset fails if the motor has been overheated many times by low power, or too long of an extension cord or powered by generator.
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