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Posted by william on Wednesday, July 23, 2008:
I have a 94' Caterpillar 939 track loader. The engine is lugging when it gets all the way heated up, and the oil pressure drops. I changed the fuel filter, emptied the water seperator, and checked the oil. The engine will drop in revs. and then pick back up when I stop putting a load on the engine. Could it be bad oil, oil pump, or crankshaft bearings?
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