Six months is not a very long period of time.
My Maytag wringer was sitting idle far longer than that and pump was fine when started. It now has developed a leak, but that is another matter.
Long as you've drained water out of them, don't think your pumps will be harmed during your absence.
What normally happens with wringer and other washer pumps that sit idle for very long periods is the crud, scum, detergent residue (powders), and so forth turn into a hard mass. This can prevent impeller from spinning. If your machines are working fine now, and have been well maintained, don't think it will be an issue.
IIRC the only other real worry about leaving washing machines and dishwashers idle for prolonged periods comes from being exposed to very cold to freezing temps.