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John Deere Tractors Discussion Forum
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JD400

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Larry

10-13-2003 17:02:50




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Recently bought a JD400 backhoe and am starting to fix it up. It has an engine miss at idle, #3 cylinder I think, as soon as you come up to half throttle it straightens out and runs fine (its a diesel). The guy I bought it from says---its in the pump (a Rosa Master)---he told me he bought an injector and put in the #3 cylinder and it continued to have the miss. Here is what I'm asking: What would be the most logical way to try and track down a problem like this? I appreciate an adivce you all can give me, and thanks in advance. I think it also has hydraulic problems, but I thought I'd get the engine running right as a first step. Its in pretty darn good shape for as old as it is, it starts, run (albeit with a miss at idle) the loader seems to work pretty good and the backhoe works...I'm really excited about getting it fixed up and using it. I was standing out in my drive way a while ago looking at it and thinking....JD sure did make things to last, didn't they!!! As I footnote, I don't know beans about a backhoe, never ever operated one, so this will be a learning experience all the way around--And let me tell you, I can't wait to get it up to par!

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jdemaris

10-13-2003 18:22:14




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 Re: JD400 in reply to Larry, 10-13-2003 17:02:50  
If it was me, I'd swap injectors, regardless of what you've been told. From what you describe, it sounds like an injector problem. I assume the engine runs okay otherwise, no excessive smoke or blowby? No telltale sounds of a valve leaking? It is possible that the pump is causing the problem, but I doubt it. That pump has only one actual high pressure pump inside of it that serves all of the cylinders. It is actuated by a ring with cam-lobes on it; one lobe for each cylinder. If one of those lobes is chipped, it could cause low fuel delivery to one cylinder without affecting the others. Seems, though, that it would affect that same cylinder throughout the RPM range. Perhaps the cylinder in question remains weak but you don't notice it at higher RPMs? Kinda' hard to tell from here.

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