jiggseob
Member
2008-ish Kubota L3540 HST with 723 loader. Theres a long back-story. Tractor came to us by a lock-stock&barrel purchase of some farm-land. It was sitting in the bush for at least the last 10 years, and the (5 years ago deceased) previous owner left the tractor in the corner of the yard because it died there. No manuals to be found. No idea why the tractor died, how bad it died, or what made owner decide to go to town and buy another rather than repair this one. And the bushes grew around it. We dragged it into the shop. Drained 10~ gals of normal-looking-smelling diesel fuel, to be discarded. Removed fuel filter, found that contents of fuel filter bowl contained not-diesel, but something that smelled almost like paint thinner; maybe thats what gasoline smells like after being blended with diesel and sits for 10+ years. Anyways, removed flushed tank and lines, refilled with clean fresh fuel, and it started right up and ran nice. Maybe the old-fellow was told that if one mistakenly puts gasoline in their diesel tractor, and runs it until it quits, the injection-pump is toast and a few thousand $$$ is required to make it better; and rather than that he just purchased another.
In the case of the Denso injection pumps on Kubota engines, they can withstand some mis-fuel event(s). As we have found with this one, at least one. Has the overall life of the injection pump been shortened by running on gasoline? Maybe, hard to know until the pump craters. But for now, it starts right up and runs nice. We have also changed hydraulic oil and filter, and engine oil and filter, and changed coolant.
Now to the reason for the post... After running for a minute at various engine speed, it seems to throttle itself down, down, down, and then die and refuse to restart. Set the hand-throttle back to idle and it starts up.
This tractor looks to have "Auto Throttle Advance". I have no idea what that does. There looks to be some sort of electrical thing, rotating position sensor or actuator on the injection pump shaft that the throttle cable rotates to speed-up or slow-down the throttle. Is this "Auto Throttle Advance" feature sensing the transmission in neutral, heel-toe-hst control at neutral, and then some gadget decides I don't want the engine running-fast and slows it down and stops it? What does this "Response" turn-button do?
If anyone knows where I can find .pdf operator and/or service manuals for this model, that would be great as well.
In the case of the Denso injection pumps on Kubota engines, they can withstand some mis-fuel event(s). As we have found with this one, at least one. Has the overall life of the injection pump been shortened by running on gasoline? Maybe, hard to know until the pump craters. But for now, it starts right up and runs nice. We have also changed hydraulic oil and filter, and engine oil and filter, and changed coolant.
Now to the reason for the post... After running for a minute at various engine speed, it seems to throttle itself down, down, down, and then die and refuse to restart. Set the hand-throttle back to idle and it starts up.
This tractor looks to have "Auto Throttle Advance". I have no idea what that does. There looks to be some sort of electrical thing, rotating position sensor or actuator on the injection pump shaft that the throttle cable rotates to speed-up or slow-down the throttle. Is this "Auto Throttle Advance" feature sensing the transmission in neutral, heel-toe-hst control at neutral, and then some gadget decides I don't want the engine running-fast and slows it down and stops it? What does this "Response" turn-button do?
If anyone knows where I can find .pdf operator and/or service manuals for this model, that would be great as well.
