Belt jumping/skipping?

So I haven’t had a chance to power my machine on yet, but when I gently move the Z and Y axis the belts pop or jump or skip? Not sure how to explain it exactly.

Is this because they are not tight enough, or because I am moving them by hand and it doesn’t like that and I should just power it on to test?

You shouldn’t push the machine around – it generates current.

The difficulty you describe is likely insufficient belt tension and uneven tension on the Y-axis.

See http://www.shapeoko.com/wiki/index.php/Belts_and_Pulleys#Proper_Tension and http://www.shapeoko.com/wiki/index.php/Shapeoko_3#Belts

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the assembly guide literally has you pushing the machine around haha, but yes I know it’s not something you want to do a bunch of. I will check the belt tension as I agree that that is most likely the culprit