Under the rectangular plate is the PTO drive gear and it turns all the time engine does with independent PTO. T shaped plate is also PTO drive parts and that's about all you can inspect trough the hole. Noise won't stop when clutch is depressed. If the noise changes speed when t/a handle is pulled back would check constant mesh gears or the reverse idler in the transmission. That's the only two gears in mesh with transmission in neutral. If noise stops with t/a lever back maybe t/a pressure plat damage or the retaining nut came loose for the t/a clutch carrier. May not stop noise anyway with some problems. You can look in the top of center housing at t/a clutch and part of t/a. If it has a belt pulley gear box cover plate you can remove it and probably see if it's in the transmission side. Also can remove gear box if equipped but not simple on the 300. With t/a lever ahead and transmission in neutral gear noise I would lean to transmission side or output gear of t/a. Or transmission main shaft pilot bearing.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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