I suggest testing fuel supply pressure, you just might be surprised by the result, then consider fluid dynamic cavitation affects on fuel injection components. It leads to low power and misfire after a length of time running under considerable load. Injector replacement won't correct low/no fuel supply pressure to the high pressure pump and resulting fluid dynamic cavitation.
Thanks. I sent you a pm asking that you give me the details over email. I appreciate all the help.
If this works, I owe you a steak dinner! I doubt my luck could be that good but it is certainly worth a try.
But replacing faulty injectors at no cost as called out in the bulletin an and has fixed the identified problem. The OP can jack around trying to diagnose it himself or he can let a qualified dealer hook up his Diagmaster and run the proscribed tests and checks to verify the faulty injectors.
The Diagmaster will not measure fuel supply pressure to the high pressure pump. The more information the tractor owner has about what causes low power after extended use at or near rated power, the better he will be equipped to discuss the problem with the technical people at his dealership. When that information comes from someone that provides engineering based test data about the problem on the same model tractor, it is a benefit to the tractor owner that has posted on this site to get to the bottom of the problem he is having. Replacing the injectors may just be a temporary repair, my input to the owner is intended to help him get to the root cause of the problem. That is how true diagnostic testing is done.
We don't require our customers to diagnose documented problems covered under warranty beyond normal maintenance items and in this case visually verifying flow to the high pressure fuel pump. Beyond that it's our job to complete the diagnosis and make repairs so the customer can get back in service. The OP can follow all your advise if he wishes, I don't really care. As I said, the information provided follows a known pattern for this particular fuel injector installed in this model tractor. There is no pattern of low pressure in the common rail associated with this failure. Low fuel supply volume would lead directly to low rail pressure IF it were the cause of the OP's symptoms. There would be stored codes for low rail pressure discovered in the dealer's diagnostic process.
You are incorrect, you can have a negative suction head pressure to the electric supply pump, there will be no codes set, no loss of fuel rail pressure until that negative pressure gets so great that the high pressure pump is starved for fuel. I have measured this.
Oh, I am not questioning that the injectors can have a problem. You are missing my point, the root cause of the problem needs to be determined. I offered advice to the tractor owner so that he can get to the cause of the problem. Just for the fun of it, what is the fuel pressure spec for the M7060 measured at the fuel filter inlet or the outlet for that matter? What is the flow rate vs pressure for that little electric fuel pump? What is the total fuel flow in that system, fuel consumed plus fuel returned? I bet you don't know that!
