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 - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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