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Read the assembly notes carefully, particularly with regard to the elements you mentioned. It is important to note that the torque gears (14 and 15) are not connected to the drive shaft (17) - they just spin freely on the shaft. Their purpose is transfer torque (and reduce speed) between gears 10 and 30. The drive gear (16) DOES drive the drive shaft by engaging the enlarged key (20).
-dave
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Y = AX^2 + BX +C
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