Now, when ya get to that belt, you'll find a 13/16" tappet wrench will come in real handy for turning that "nut" on the shaft just in front of the bracket. But you'll also find that that ain't a common size for a tappet wrench, in which case you need to use, get, borrow (and RETURN!) or otherwise acquire one of them narrow-jawed adjustables for the job. I think Craftsman calls them beak-jaws.
It's a clever setup. The slot on the back of the mounting bracket should hold the big nut in place while you turn the "nut" on the shaft to loosen and tighten the adjustment. A square nut would work best in that situation and that's what my BN has. Only trick is after it's out a little, you have to keep a little forward tension on the pulley to keep the face of the nut bound against the sides of the channel.
Don't know what your FC has back there, but my SuperC has a hex nut on the back end that doesn't quite bind up in that channel the way it should. It holds well enough for loosening it up, but I usually have to snake a wrench onto it to get it to hold when tightening back up. Just for giggles, I checked the parts book, thinkin' it might have been replaced somewhere along the line, but nope. The parts book lists just a regular 5/8" NF hex nut, not oversize or anything special or exotic. I'm thinkin' I may just try to put a square head on it next time I have to fiddle with it and see how that works.
You'll have to decide which pain-in-the-neck way to go at it. You can remove the fan and pulleys all the way, or you can just loosen the whole rig and let it slide to the bottom, so that you can slip the new belt over the fan and under the fan belt. Either way should provide a good opportunity to exercise and refresh the colorful side of your vocabulary.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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