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Is that the swing motor or gearbox? I would venture to say that has some to with the swing issue, but its odd that without a load, it operates fairly normal but under a load, it doesnt. May be more stuff chewed up.

@KN6KXR i think you may be on to something with the bearings being bad/corroded or congealed grease, but i would think even congealed grease, would be able to pushed through. when you are picking up a load and trying to rotate it, where are you picking the load from, directly off the back, 90*...