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I'm nursing along an old 93A backhoe attachment for my JD 450 track loader. Of course it leaks hydraulic fluid from multiple locations but the worst culprit are some little round things located on one or two of the control valves between the two hose connections. this photo shows the overall...

I've got a JD 450 track loader that runs just fine when first started but, after a while, starts running somewhat ragged. If it was a gas engine, I'd say it was running too rich, causing it to miss occasionally, etc. But it's a diesel, the 202 cu in 4-cylinder engine that JD used in these...