Early 560 came with a bull gear that would interchange with a M. But after that the teeth pattern was changed more than once on 560 tractors and also on early ones that got the full updates installed. IH had a update program. Updated bull gears or 560 tractors built after updates were factory installed don't mesh right with a M bull pinion gear. Axle spline size still the M size. Know of some that have ground the part of M clamp that goes in the keyway off and used them on a one keyway axle. Good chance they could fail at maximum pull and traction. M clamp used four 3/4 inch diameter bolts. 560 clamps used four 7/8 diameter bolts. IH did make a wheel for M type rims with axle clamps just like a 560 and a steel axle key. Came out about 1955 and looks just like a M wheel except in the clamp area. Used as a replacement wheel for previous tractors with 2.75 axles. At 560 serial number 13814 up axles were changed from alloy steel to a carbon steel and method of hardening changed from furnace hardening to induction hardening to increase the strength of axle.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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