Not all changes came in that original box of bull gears, differential, tapered roller bearings on diff etc. After they still had bearing problems a new bearing package was introduced. I put in several to the same tractors I originally had put the update pkg in. The axles never did and still do not have tapered roller bearings. Flat roller bower bearing on inner and improved (with extra clearance for flexing axle) ball bearing on outer axle. The 656 has tapered roller pretty much all the way through and inner support on bull pinion shafts. Their bull gears are smaller in dia but much wider tooth profile. The latest lube tubes were not in the 560 original pkg either. That was an after thought. We had to drill holes in differential, bull pinion support housing when that tube was added.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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