update on M6060 Kubota

Keith Molden

Well-known Member
I called the dealer yesterday and the mechanic said he had drained the fuel and had blown out the fuel lines but could find nothing. I told him I had also done that and had told the service manager when I brought it in. He said he was gonna hook it up to the dyno and see if he could make it loose rpms, Well this morning he said he had put it on for 20 minutes and it only dropped a couple hundred rpms and doesn't know what else to do with it cause he can't find anything wrong with it. I again talked with the service manager & told her that I'm pretty sure I'm not loosing my mind jokingly that it was doing that I said it was so what do I do now, come get it and use it for a yard ornament cause it sure isn't good for a tractor. They are gonna get in touch with the tech and they should have an answer for us. I do understand that sometimes problems like this are terribly hard to find till it does show up. I used to own a garage and wrecker service so I also know about dealing with customers too and I try to be as nice as I can to the poor guy working on it in 95 defree heat even with a fan it's miserable. Keith
 
That doesn't sound very encouraging. Although why did it lose the RPMs at one time when they had it hooked up? It seems like that would indicate something was wrong. Thanks for the update keep us posted on your findings.
 
I don't understand. Did mechanic mean it dropped couple hundred then came back or under full load it dropped couple hundred and held steady.
 
I'm not sure exactly what he meant by the drop. He really didn't sound too interested in truly finding an answer for me. I think, and I only think, he really does not think anything's wrong with it. I believe he thinks the tractor is OK and I'm the one who is wrong. We'll see what happens. Keith
 
You may have to go above the dealer to the area rep. I did that once on a new Case Farmall I bought. Boy stuff starts happening then.
 
Perhaps you should assume that it was a booger in the fuel line. A booger from the fuel tank.
Perhaps he has drained off the bad fuel. Did he replenish with fresh and clean fuel. And perhaps he was successful in blowing out a clog that you had only partial success with.

Sounds like you need to get it back in the field and working.
 
Well, I believe if that is an electronic controlled fuel system it should drop almost no rpm, unless extremely way over loaded out its horsepower range. The ECM will give it as much fuel as it can to maintain rpms. Does that engine have an EGR valve with a variable vane turbo? I would think that a fault there would make a code, but maybe not. Under a load, the EGR closes and the vanes shift to maintain turbocharger boost. If there is linkage involved, it could be loose or off perhaps, not making a code. I am unfamiliar with this particular engine, but I know that loosing boost is not always evident. You could have a leak in the turbo hoses, or charge air cooler. You need fuel to make boost, and the ECM has to read boost to send fuel. I have also seen a boost sender stuck on a low reading, causing a no power complaint. Mark.
 
If they had it on a dyno and had it running at rated PTO speed the horse power should be at or above the advertised HP since it is near new. On a dyno if running at rated RPM it should not change on it's own no matter how long you run it. So if it was set at a certain RPM and left to run for 20 minutes it still should be where you left it. Now you do have to maintain the oil in the dyno at a proper temperature and you control that with the amount of cooling water you let into the oil cooler. At least that is how the old M&W one I have is. Now you can crank'er down and bring it to it's knees with the adjustment wheel but that really won't tell you much other than the clutch is not slipping.
 
I replaced it with new fuel as did he. there was nothing in ther fuel and all my other equipment runs off that same fuel tank and nothing different from any of them. I really believe it's caused by something electronic or the turbo. I doubt they are going to find a ix for it so I'll probably go pick it up and try to get a mechanic out here when I start baling again next week. The bad part is that it takes about an hour to get here from the dealership. Keith
 
Keith: I will throw this out there. I have ran into tractors doing this. I found that to actually find the trouble you have to be in field conditions. Meaning moving around on different slopes. You could have some thing floating in the tank that only causes trouble when sloshed around.

I had a JD 4020 that was doing what your talking about. I flushed the tank and changed the filters several times. I changed the fuel transfer pump. I even tore the injection pump down to look for anything. Removed all the fuel lines and blew them out clean. I finally was so sick of the tractor I installed a small fuel tank along the frame. The tractor ran fine for a whole day doing hay work. I took the tank out of the frame and flushed it again. I caught everything that came out of the tank. Nothing that would restrict the fuel flow. So I took a nibbler and cut the tank in half. Found a bunch of straw looking weed stems in the tank. They would kind of float but would stick to the sides of the tank when you tried to flush them out. I asked the owner about it. He told me that until the winter, before his trouble, the fuel gauge did not work and he just stuck the tank with whatever was handy. ERGGGGGG!!!!!! He about had a heart attack when I showed him the hours of labor we had in finding his trouble. LOL.

So look for something in the tank. I do not know how the tank is shaped in the tractor your working on. One of those little cameras that you look into walls and such might let you look closer at the tank when drained.
 
Traditional farmer: It only takes one can of fuel with something in it to make problems.

Also to answer your question why this repair would NOT be covered under warranty. Contaminated fuel in the system IS not covered under warranty.

At the first dealership I worked at we had someone drop a couple of ping pong balls into several of the new tractors. They would get sucked down on the outlet and strive the fuel system to where the tractor would sometimes die or at least loose power. Then when it quit pulling fuel the ball would float back up. This would have been in the 55 series tractors. Most of them had baffles that keep you from being able to see in the fuel tank very well. Cost us quite a lot of labor that was not under warranty and we sure could not bill the customers as it happened at our store.
 
It sure hasn't been proven there is any problem with the fuel though,that's just a red herring by dealerships to get out of really finding what is wrong most times.If he has other tractors which I'm sure he does and they are using the same fuel with no problems that would rule out fuel being the issue.In the last 20 years I've burned a lot of diesel in a lot of different tractors and have never had the fuel be a problem.That said I only buy auto diesel from Sheetz from their pump don't fool with the off road stuff just file for the tax back on it, as I figure no fuel company is going to put 2nd rate fuel in a tank to be used by some fancy diesel cars(LOL)
 
Thanks JD, he pulled the tank and checked it. I'm wondering how the hand throttle control works. I know it is electronic so there has to be wires. Sitting here thinking , and I'm going to throw it at the mechanic this morning. When I bought the tractor I had them install another set of remotes. The hand throttle ins in the panel that has to be removed for that installation. Wondering if that may have a plug in loose. I guess it's time for the KISS method to start working. It has to be something simple. The engine does not labor, miss or sputter. It does not smoke any color smoke, just pretty much acts like you slid the hand throttle back and let the rpms drop gradually.
 
Isn't this tractor a Tier IV diesel with the exhaust filters and regeneration garbage? Everyone has addressed fuel delivery issues but if the exhaust is blocked, it won't run and the control computer should be "limping" it. (My experience is with the Dodge diesels doing this).
 
Traditional Farmer: The fellows we had trouble with where the custom fellows that had the farmer supply the fuel. So they were getting fuel from everyone. Also some weekend warrior types would not have a tank and used five gallon cans. These often are terrible for having/getting dirt in them.

Keith posted after we did that they had pulled the fuel tank and did not find anything. So my post was not relevant to his current issue.
 
I've never had any problem with ther regen. It has never gotten down to the point of limping. I am believing the problem is with the wiring somewhere. I'll check early in the morning when it's cooler. Right now it's 99F. degrees in the shade and my COPD just won't let me be out in this heat for more than a few minutes so the tractor will just have to wait. By the way all the checking and time he spent on it was just over 300. at the dealer. I paid it without a thought and I appreciated what he did for me. A ghost problem is the hardest thing to locate so I don't have any problem at all with that. keith
 

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