Hirobo HI0402593 Shuttle SE drive pulley 20T  [HI0402593]

Drive pulley for Shuttle SE

This Hirobo drive pulley is an RC-scale replacement part specified by the product code HI0402593 and intended for Shuttle SE helicopter drive systems. The 20T designation refers to its tooth count and defines its role in gear ratio and mesh setup rather than a material grade or load rating.

In practice the pulley serves in the drivetrain to transfer torque between mating gears; when replacing it check gear mesh, bearing condition, and shaft alignment on the Shuttle SE platform. Work methodically: remove the original component, inspect surrounding gears and bearings for wear, fit the new pulley with correct alignment, and verify free rotation before power-up.

Use this part when performing routine maintenance or when restoring drive precision after extended use. Keeping the pulley and its mating gears within correct mesh tolerances helps reduce vibration and uneven wear in the RC helicopter’s drivetrain, and supports predictable tuning adjustments.