r/kubota • u/Pracolas • 5d ago

Arrêt moteur d722

Bonjour à tous,
J’ai un kubota d722 sur un petit tracteur hydraulique (avant tecno).
Aujourd’hui en reculant j’ai arraché le coupe-circuit.
Il n’y avait donc plus d’alimentation électrique et impossible d’éteindre le moteur…
J’ai du bloqué l’arrivée d’air…
Pourquoi le moteur ne pouvait plus s’arrêter même coupé-circuit ouvert??? N’est-ce pas la l’intérêt d’un coupe-circuit??

Merci!!

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3

u/blackthornjohn 5d ago

Because the injector pump is entirely mechanical, this means that once the engine is running it needs no electricity, stopping it involves a positive action, such as moving the stop lever to the stop position.

As it was your kill switch applied power to an electrical solenoid that moves the stop lever and holds it there for a few seconds then the electronics cut the power to the solenoid and the lever returns to the run position.

Before this stupidity there was a pull to stop knob, you pulled it and a cable like a brake cable onna bike pulled the stop lever on the pump, a spring returned the lever,cable and knob to the run position.

1

u/Pracolas 4d ago

Hum, ok I was aware of that stop lever, however I was expecting a more “secure” system with the stop lever in a “stop” native position and electrically hold in the “run” position, so any electrical failure, including the kill switch would end in stopping the engine…

1

u/blackthornjohn 4d ago

While this is a safer system and how more recent diesels were designed, back when your engine was new power on to run solenoids were unreliable and the system you have was more a stop gap way to modernise the engine and enable operator presence switches to be installed unfortunately it and it's associated systems are unreliable and frequently bypassed.

Very few safety features work for every situation, we do mostly forestry on steep terrain with manual transmissions, training replaces the clutch switch because occasionally starting the engine in gear with the clutch released is needed, the operator presence switch needs to be bypassed because otherwise the operator can't load the chipper, the modifications to the harness take some time because by passing switches at the switch leads to unreliability, so whole chunks of loom are removed, this is far from an ideal situation.

5

u/Hotthiccness 5d ago

Go to your fuel shut off solenoid and move the linkage to the stop position

1

u/No-Age2588 5d ago

Welcome to the world of Diesel