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The number one issue is bad fuel - even if you just purchased it, turn the cell over and check the date stamped on the bottom (often stores don't rotate their stock)
If the fan starts when the nose is depressed but there is no spark then I would investigate the spark wire (make sure there are no nicks or cuts that may short to ground) and the ESU (Electronic Spark Unit).

Hitachi Tools &... | Answered on Feb 02, 2019


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.

Hitachi Air... | Answered on Feb 02, 2019


learnhowtousethatspacebar

Hitachi... | Answered on Jan 28, 2019


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.

Hitachi EC12... | Answered on Jan 21, 2019


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

Hitachi Air... | Answered on Jan 21, 2019


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.

Hitachi EC119SA... | Answered on Jan 21, 2019


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.

Hitachi Reset... | Answered on Jan 21, 2019


Try unplugging it and wait a bit before plugging it in. Plug directly to wall instead of surge protector. If all this fails it may be toast as was mine but contact Hitachi before recycling it.

Hitachi... | Answered on Jan 20, 2019


8 ounces of Synthetic Oil SAE15W40

Hitachi Air... | Answered on Jan 19, 2019


If its not an bad soldering or an passive component , beware almost all brands wenn ordering an electric part for a charger its almost always more expensive then a complete (new charger ) the latest years there are more and more remplacement options to the customer , if there are defect components that are not made for ordering on marketing technical reasons and safety and more reasons. mosnfets (passive component almost sometimes fuse resistors but smd components to repair is not meaningfull . when termical defects are hidden.

Hitachi Drills | Answered on Jan 18, 2019


If you wish to get some details; visit the sites linked here. Pull up older posts.
https://electronicshelponline.blogspot.com/
http://homenol.blogspot.com/

Hitachi... | Answered on Jan 13, 2019


tell me the model

Hitachi... | Answered on Jan 11, 2019


Most devices have drivers for Windows and Microsoft is supposed to plug and play them for detected devices. If your operating system is not Windows, you can usually find driver files at the manufacturer's website under SUPPORT and DOWNLOADS

Hitachi Office... | Answered on Jan 02, 2019

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