EX140US-5のエンジンが切れない件について (Regarding the engine not turning off)

HITACHIのEX140US-5ですが、キーがオフになったためエンジンが切れてしまいました。 キーをオンにしてオフにするとアクセルモーターはシャットオフ側に動くので、エンジン回転時はオルタネーターの発電電流が走り続けてMCがキーオフを検知できていないものと思われます もしかしたらリストの故障かかと思われますが、この部分はパーツにも載っていないので部品番号も不明なので、取り出し確認後、現場でそのまま汎用のランダムで修理したいと思います。 何かの物を準備したらいいですか？ 場所はどこに配置されているでしょうか？ 交換/補修した方は無いですか？ アドバイスを差し上げます。 写真や図面があれば尚嬉しいです。

Translated to English Regarding the Hitachi EX140US-5: the engine shut down because the key was turned to the OFF position. When the key is cycled from ON to OFF, the throttle motor moves to the shut-off position; however, since the alternator continues to generate current while the engine is running, it appears the Machine Controller (MC) is failing to detect the key-off signal. I suspect the fault lies with the relay, but since this component isn't listed in the parts catalog and the part number is unknown, I plan to remove and inspect it, then perform an on-site repair using a generic replacement. Is there anything specific I should prepare? Where is this component located? Has anyone here performed a replacement or repair on this part? I would appreciate any advice. Photos or diagrams would be especially helpful.

Thank you, Old Syko for providing that translation. To yamasurume, welcome to Heavy Equipment Forums. One of our Forum Rules is that English is the official language of Heavy Equipment Forums. In the future please abide by that rule. Best of luck in finding a solution to your problem.

yamasurume said: HITACHIのEX140US-5ですが、キーがオフになったためエンジンが切れてしまいました。 キーをオンにしてオフにするとアクセルモーターはシャットオフ側に動くので、エンジン回転時はオルタネーターの発電電流が走り続けてMCがキーオフを検知できていないものと思われます もしかしたらリストの故障かかと思われますが、この部分はパーツにも載っていないので部品番号も不明なので、取り出し確認後、現場でそのまま汎用のランダムで修理したいと思います。 何かの物を準備したらいいですか？ 場所はどこに配置されているでしょうか？ 交換/補修した方は無いですか？ アドバイスを差し上げます。 写真や図面があれば尚嬉しいです。 Click to expand... Yep, battery relay stuck closed. Generic 24V will get you going. Good luck

ありがとうございます。日本語で入力したため、翻訳が少しずれてしまったようです。EX140US-5についてです。キーをオフにしてもアクセルモーターが停止側に動かず、エンジンが停止しません。エンジンをかけずにキーをオンオフするとアクセルモーターは停止側に動くので、エンジン作動中はMCがキーオフを認識していないのではないかと思います。考えられるのは、逆流防止ダイオードが破損し、オルタネーターからの電流が図の端子5に逆流しているのではないかということです。しかし、ダイオードは部品リストや配線図に記載されていないため、どこを確認すればよいのか、どのような部品を用意すればよいのか分かりません。フォーラムでシートの後ろのパネルにあると読んだので、明日開けてみようと思いますが、経験のある方からのアドバイスをいただけると大変助かります。

まず、オルタネーターのカップリングを取り外して、エンジンが正常に停止するかどうかを確認したいです。もしダイオードの故障が見つかったら、自分で修理したいと思っています。3Aのダイオードを用意しても大丈夫でしょうか？

yamasurume, you need to do your own translation and post in English as required. Thank you. It seems the translation was slightly off because I originally typed in Japanese; I am referring to the EX140US-5. When I turn the key off, the throttle motor does not move to the stop position, and the engine fails to shut down. However, if I toggle the key on and off without starting the engine, the throttle motor does move to the stop position, which leads me to suspect that the MC (Machine Controller) isn't recognizing the key-off signal while the engine is running. One possibility is that a backflow prevention diode has failed, allowing current from the alternator to flow back into terminal 5 (as shown in the diagram). However, since this diode isn't listed in the parts list or wiring diagram, I’m unsure where to check or what replacement part to get. I read on a forum that it might be located in the panel behind the seat, so I plan to open that up tomorrow, but I would greatly appreciate any advice from those with experience.

yamasurume said: まず、オルタネーターのカップリングを取り外して、エンジンが正常に停止するかどうかを確認したいです。もしダイオードの故障が見つかったら、自分で修理したいと思っています。3Aのダイオードを用意しても大丈夫でしょうか？ Click to expand... First, I would like to remove the alternator coupling and check if the engine stops correctly. If I find a faulty diode, I plan to repair it myself. Would it be okay to use a 3A diode?

Old Syko said: yamasurume, you need to do your own translation and post in English as required. Click to expand... It's actually the first rule: Standard English is the official language of Heavy Equipment Forums, all posts must be made in English. Posts appearing in a language other than English will be removed from the Board.

EX120-5のものですが、姉妹機種なので同じものだと思います。

digger242j said: これは実は第一のルールです。 重機フォーラムの公式言語は標準英語です。すべての投稿は英語で行ってください。英語以外の言語で投稿された内容は掲示板から削除されます。 Click to expand... 英語で再投稿しました。これでよろしいでしょうか？

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Old Syko said: First, I would like to remove the alternator coupling and check if the engine stops correctly. If I find a faulty diode, I plan to repair it myself. Would it be okay to use a 3A diode? Click to expand... Is it possible you could tell him in Japanese he has to use English on the forum? He's just a guy trying to fix his excavator.

Either way Dave everyone has to use a translater including the OP on this post. The OP has been mentioned by a moderater. Kia kaha.

Yeah, sorry about that

Welder Dave said: Is it possible you could tell him in Japanese he has to use English on the forum? He's just a guy trying to fix his excavator. Click to expand... Dave he has access to the translator just as we all do as he has proven with his last post. You also have access to this. Use of the translator gives us all access to more repair info and even parts that are made elsewhere no matter which language you and your provider speak. Do a quick search for the translator and you can use it between multiple different languages but the results aren't always perfect. From the schematics yamasurme posted I would say he is on the right track but I have no experience with his particular machine so someone else needs to pitch in.

Old Syko said: Dave he has access to the translator just as we all do as he has proven with his last post. You also have access to this. Use of the translator gives us all access to more repair info and even parts that are made elsewhere no matter which language you and your provider speak. Do a quick search for the translator and you can use it between multiple different languages but the results aren't always perfect. Click to expand... We all have quick and easy access to a translator - that's not the point. HEF is an English speaking forum and ALL posts are required to be in English. The official rule says the posts not in English will be removed. There is leeway being shown here.

CM1995 said: We all have quick and easy access to a translator - that's not the point. HEF is an English speaking forum and ALL posts are required to be in English. The official rule says the posts not in English will be removed. There is leeway being shown here. Click to expand... I'm well aware of this which is why I posted as I did. Personally I have posted on other foreign sites where I made the the translation to their language and as soon as I posted it was changed back to English. Don't know if that is what took place here or not but it does happen. I've lost access to 2 other sites because of this so yes it can happen. BTW I'm possibly as redneck English as anyone else you know.

Just trying to help someone out. Looks like it has been resolved.