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I've always wondered what the wheel tightening noises are right before taxiing.

So it's the hydraulic equivalent of a buck/boost converter?

nicely put, but yeah.

More pleasant than the dying whale sound™ produced by some of the engines they use (PW1000G)

Do you mean the drill-like noises (reminds me of racing impact wrench)? I always assumed that was the cargo pay door securing itself.