This is a pretty common problem with the C super C, 200, and 230. I have a C and two Supers, and they have all been done at least once, and the C about three times. You don't have to work them all that heavily to break the axle, just a lot of hours. What got the C, I am sure was snowplowing and rough mowing. When doing either of these things, you are constantly shuttling back and forth, and each shift torques the axle a little bit, sort of like twisting a wire back and forth to break it. There are a lot of places that have used parts for sale, the axle is heavy enough that close is better to save on shipping. Many of the used ones will have had the outer end hacked off, this is perfectly okay, unless you need to set the wheels out to maximum width, or want show quality. There are two types of retainer for the bull gear, the early models use a plate with two bolts to hold it on, the later models are grooved for a retaining ring, make sure you get the hardware if the new axle is different than the old. While you have the axle out take a very close look at the bearings and seals, now is the time to replace them if necessary, just be sitting down when you ask the price. Now is the time to get a shop manual if you don't already have one. That and a parts book will answer many questions for you. If your interest runs that way, this might also be the time to start looking for a parts tractor. If you find one you can switch the whole axle and housing, and save yourself some work. beside that, if you are going to use the tractor you will eventually need other parts.
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