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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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