Just had a warranty engine replacement on my KX91 and after about 7 hours the machine will no longer do anything but low idle (around 700rpm).
Info:
The auto idle selection doesn't do anything
The idle low/high idle doesn't change anything.
Manually moving the throttle near fuel injectors actually causes the engine to die instead of rev up.
thought it may be the fuel filter, which is new, so I took it off but noticed nothing. I didn't cut it open but it looks clean.
I checked the injectors, slightly loosened and diesel came out as expected, so it's getting fuel there.
Next thought is that it's getting air in the line somehow. I've looked everywhere and the only suspect part is near the on/off water separator and the fuel on/off valve. The input and output fuel lines go into metal aluminum elbows that are loose. Both will come out with a light tug. The Kubota dealer says tht this type of thing is not unusual but they are not sure that would cause the problem.
To test, I bypassed the system all together. I then let the system fuel prime pump run for a while to make sure any air gaps were pushed out but no luck. Turned the engine on and it goes right to low idle and stays...
Unfortunately the excavator doesn't have enough power at 700rpm to load on the trailer, so I can't just take it in to the shop.
Any ideas?
Info:
The auto idle selection doesn't do anything
The idle low/high idle doesn't change anything.
Manually moving the throttle near fuel injectors actually causes the engine to die instead of rev up.
thought it may be the fuel filter, which is new, so I took it off but noticed nothing. I didn't cut it open but it looks clean.
I checked the injectors, slightly loosened and diesel came out as expected, so it's getting fuel there.
Next thought is that it's getting air in the line somehow. I've looked everywhere and the only suspect part is near the on/off water separator and the fuel on/off valve. The input and output fuel lines go into metal aluminum elbows that are loose. Both will come out with a light tug. The Kubota dealer says tht this type of thing is not unusual but they are not sure that would cause the problem.
To test, I bypassed the system all together. I then let the system fuel prime pump run for a while to make sure any air gaps were pushed out but no luck. Turned the engine on and it goes right to low idle and stays...
Unfortunately the excavator doesn't have enough power at 700rpm to load on the trailer, so I can't just take it in to the shop.
Any ideas?