The Factory Pro FP-O-AP0006 main idle gear is a 28T replacement intended for O-AP0004 and Tamiya T3-01 configurations in 1/10 scale RC models. It serves as the central idle gear that supports the spur and maintains correct mesh when the motor is not driving the spur directly.
Made with a precision-machined tooth profile, the component is suitable for scheduled maintenance and part swaps. When replacing the idle gear check the adjacent bearings and spur for wear, verify axial alignment, and set mesh and shims so the gear spins freely without binding.
From a setup standpoint this idle gear affects drivetrain neutrality and coast noise, so include backlash and bearing fit checks when tuning. Install it as a direct swap for worn or damaged idle gears matched to O-AP0004 mounting and the T3-01 gear train layout.
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