Guy at the local diesel shop had a 740 D24 in when I was down there - apparently it had sat for years. When they started it up, it revved up fine, but would not fall - apparently there was something in the pump that had siezed so would not reduce the fuel supply on letting the accelerator off. Luckily it only hung around 3,500rpm.
Did you take your pump apart in any way? I've heard if the governer doesn't go back together correctly it can do the same when there is no load on the engine.
Would be interested to see the pics - don't imagine they are too pretty though!
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