>they told me in this case (maybe the correct expression
>instead of "unloaded" is "without payload")

Yeah, I can live with either expression as meaning the same thing in this
context.

>the cooling of the pump itself will be insufficient
>and the bearing of the pump becomes hot and therefore
>damaged. This is what they want to avoid.

OK, that explains a lot of things about "why" you want to do it.

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