如果經過檢查發現電路和油路都沒有問題，那么就有可能是發動機產生的機械故障。
一般柴油發動機發生機械故障的幾率比較低，但是一旦發生機械故障就面臨著要大修發動機了，常見的發動機機械故障有拉缸、燒瓦、搗缸等等，一般情況下發動機發生機械故障都是有前兆的，比如在正常作業中發動機突然運轉無力，或是總冒黑煙以及運轉過程有異響等等。
4、大修發動機
機械故障多是在發動機工作時發生的，冷車啟動時發生機械故障幾率較低，而且一般挖掘機的發動機發生機械故障都需要吊裝發動機進行拆解維修，建議找部門或是發動機維修人員進行維修。
總結：
冷車打不著車是很常見的現象，一般都發生在挖掘機停止作業好幾天甚至更久之后，這種情況下打不著車的原因主要是電路故障和油路故障，具備一些檢修的基礎知識能在挖掘機的經營過程中方便許多。
1、機油壓力傳感器壓力與輸出電壓成線性，壓力從 0 到 10 bar，輸出電壓從 0.5 到 4.5伏。
判定故障方法：先點火開關打到“OFF” ，拔下機油壓力傳感器線束插頭，再將點火開關打到“ON” ，測定其插頭的 3腳(A24)與搭鐵間電壓是否為輸入電壓(大約為 4.5~5V),4腳(A44)與搭鐵間的電壓是否為零。
如果測量結果偏差較大，則說明線束狀態有問題，或是 ECU 的輸出電壓有問題。
We will also focus on some of our standard products such as Hydraulic Head And Rotor assembly, fuel injector nozzle, feed pumps, common rail diesel and many more. That is why we would like to invite you to come over to have a look at our great booth. It is the perfect opportunity 8AUGK to get to know each other better and learn more about what we have to offer you.
Your presence will do us great honor and we are looking forward to seeing you.
On behalf of China Lutong Machinery Works Co,.Ltd., we sincerely invite you and your company representatives to visit our booth at Automechanika Istanbul 2023 from 8th to 11th of June 2023. Our information about this event is as follows,
China-Lutong is one of the professional Chinese companies in the distribution and manufacturing of parts, components and equipment for diesel fuel injection systems. Based on the principle of honesty, credibility and mutual benefit, our company always adheres to promote mutual advantage through joint efforts.
If you're participating, we'd love to see you there. Visit us at our Booth C170 in Hall 11A at the Tüyap Fair Convention & Congress Center. We hope to establish a long-term business relationship between our two companies.
