 I don't want to sound like I am lecturing you but, I suggest that you get either an IT manual or a Case DC Service manual, as they both give detailed instructions. OK,the process is to remove the rear transmission housing, this requires opening the clutch inspection plate on the bell housing and removing the snap ring on the PTO drive shaft for 1952 and newer models. Also, it is a much easier job if you take off the transmission top cover. Then losten the nuts on left and right axel housings. They are designed to slide on the gasket, but after 50+ years, anything can happen, if they tear, there is always silicon, or you can also cut a new set. Anyway, tighten the two square bolt heads on either side of the bull gears on the side of the transmission housing until there is 1" of up and down movement of the chain 1/2 way between the two sprockets. This is almost impossible to check if you don't remove the top plate. I strongly recommend you take time to adjust the chains as I have seen several DC's with chains so loose they were wearing groves in the bottom of the transmission case.
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