Ist check your agitator shaft for looseness. the shaft you put the beater on. wiggle side to side. if tight no play. If in first its quiet but you can here a grumble under load but second gets louder. and third even louder. If the shaft is tight. your gears down there are warn. you can take that all off with the two nuts underneath. and check the grease on the gears but even with new grease on them it most likely stay loud. grease it with hobart grease from your loacal hobart for the A-200 planitary not the transmision they also fve grease for Trans. if you can take the noise run it that way if not decide which arm & leg you want to give hobart for new gears.