IH 430 chain tightening

I’m new to farming started this year. I picked up a baler and swather for dirt cheap. The baler works good and I’ve already done 200 bales this first cutting anyway I just noticed that the chains both top and bottom are loose the bottom isn’t too bad but the top is worse I oil them and it runs fine. I have probably 400 more bales to go for this season but was wondering how to tighten these chains up? Will it mess up my timing? What should I do? Should I wait till I’m done for the season? Thanks in advance

IH 430 chain tightening