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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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