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I have a few questions about sickle sections for my AC 904 haybine. The back story is out of frugality I rebuilt the cutter bars in both my machines with aftermarket I-H guards because they were almost an exact match and cost 1/4 of AGCO guards. I just started a project in which I am grafting an Allis sickle head to a sickle for a JD 1209/1219 haybine I had laying around. This sickle is left over from a machine we had recently in which the sickle only had one years use but I trashed the head trying to pull the sickle one day so it got set aside for spare parts. The project is actually going quite well, but while doing so I noticed that my existing AC cutter bars have over serrated sections while the JD cutter bar (actually aftermarket from Fleet Farm) has under serrated sections. So far my machine has worked fine with the IH guards and AGCO over serrated sections. Unfortunately Fleet Farm only carries a riveted JD cutter bar with under serrated sections. The book lists an over serrated option but Fleet does not carry it. I also dug back in the family archives (corner of the sheds) since we had both 1209 and 1219 haybines and noticed over the years we have used both under and over serrated sickles in the JDs. It seems the newer JD sickles in the shed had under serrated sections though. Because of this I have the following questions.
1.) What are the general differences and opinions of over versus under serrated sections?
2.) Is there any specific difference in the design of the guards to accommodate over versus under serrated sections?
3.) Assuming not, is there any issue with mixing and matching types of sections on a cutter bar? All I have as far as replacement sections right now are AGCO over serrated. As sections wear on the modified JD cutter bar I might replace them with AGCO sections thus the mix and match.
I suppose if worse come to worse I could just go to the JD dealer and see how much they want for an over serrated sickle. Thank you as always fr the help. Mike
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