Old, as another poster said, check the hold down clamps and the gaps on the guards. Sometimes on worn guards and lots of grass in the bottom of the hay, the knife will pull the fine grass thru the gap in the guard and widen it. Inspect the guards and tap the tops down with a hammer to close the gap. On the older IH mowers all knives and guards were the same but later on in the 1960s IH released a triple knife for the out end and a stubby guard for the outer end that was supposed to prevent plugging and trailing on the swath board. IH also release a rock guard and a heavier serrated knife for farms that had small rocks. We had a IH C-28 3pt mower for many years and I cut many acres with it. Broke many knives, guards and a few pitman sticks.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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