CAT C9.3 in Metso Locotrack LT106

A CAT C9.3 Tier 4 engine is installed on a Locotrack LT106 crusher. The problem is that the engine stops 5 seconds after starting. There are no errors, the fuel pressure is normal, and there is no other reason for the engine to stop. I suspect the engine is being stopped by the crusher's electronic system. We started fiddling with the wires in the electronics box, the engine started and ran for a couple of minutes, and then stopped for no apparent reason. There is no wiring diagram for this crusher. How does the engine stop system work? When the engine stops, the CAT ET maintains communication with the engine. I checked all the parameters and found nothing that could cause the engine to stop. What are your thoughts on this?

Deimos said: There is no wiring diagram for this crusher. Click to expand... Is the attached of any use.?

Thanks for the wiring diagram, Nige. It'll be useful. I see there's some kind of Engine Stop Solenoid. I'd like to know where it's located on the crusher and how it stops the engine. In CAT ET, when the engine stops, the Shatdown= OFF, Injection Disabled = OFF, and all pressures (oil and fuel) only begin to drop after the engine starts to stop. Power is also present at the engine ECM, and the CAT ET maintains communication with the engine after it's stopped.

I've never worked on one of these machines before but from what I know (and I may be wrong) is that if one or more E-Stop buttons are pressed then the engine will not start.

Nige said: I've never worked on one of these machines before but from what I know (and I may be wrong) is that if one or more E-Stop buttons are pressed then the engine will not start. Click to expand... Your not wrong

The emergency stop buttons were checked and they were not pressed.

The customer's electricians identified the problem and replaced a relay in the crusher's electrical panel. The engine starts and runs, but there's a low fuel rail pressure issue. All new injectors had been replaced, a new high-pressure fuel pump installed, a rail pressure sensor, and a rail relief valve installed, but the fuel rail pressure doesn't rise above 30,000 kPa at full speed. Before replacing the high-pressure pump, the fuel rail pressure never rose above 15,000 kPa. There's information that the customer installed and then removed the injectors themselves for inspection because they were unsure if they were working properly, even though they were new. The injector needle tubes were most likely reversed during reinstallation. Caterpillar instructions state that injector needle tubes should always be new or reused only with the same injector. Could fuel leaks occur if the injector needle tubes are installed incorrectly?

C9.3 prefix C9N

The problem was with the fuel rail relief valve. The valve would start leaking fuel when the engine started. The most interesting thing is that the valve was new; the customer installed it himself, taking it out of a box with a CAT label. It could be defective, or it could be counterfeit. But the point is, this valve was above suspicion.

It’s always worth remembering that “new” simply means “not tested in operation yet“.

Hello, I am new at forums but if you have issues with Metso machines you can ask from me since I live in Finland and also own some Lokotracks. For the future, these machines give Alarm 39 No connection to DCM module if push button E stop is pressed or wire is broken. Metso LCD display can tell all the faults and alarms caused shutdown except engine based, it has only yellow or red alarm for the engine and some regular faut codes like oilpress and temp alarm