The hydraulic pump gears are narrower than the cam gear. The remaining parts of the cam teeth are enough to keep the camshaft turning.
Excessive loading on the hydraulic pump can cause the damage you see in the picture. Most likely the pump gear is a steel cut gear and the cam gear a cast iron gear. A hydraulic system that stays on high pressure will end up with those results.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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