TSURUGI SX 95T Main Gear for RC Helicopter Main Transmission - Hirobo HI0404512  [HI0404512]

TSURUGI SX 95T Replacement Main Gear

This Hirobo HI0404512 main gear is an aftermarket transmission replacement designed for TSURUGI SX helicopter models. It transfers motor output through the main gearbox to the rotor system and uses a 95T tooth count to set mesh and the drive ratio with your motor pinion.

Fitment and role: confirm the part matches TSURUGI SX main shaft dimensions and keeps the correct centre distance to the pinion; the 95T tooth count sets the intended tooth mesh and overall drive ratio for common TSURUGI SX configurations. Inspect the mating pinion, wave washers, and spacers for wear before final assembly.

Installation notes: dry-fit the gear first to verify backlash and alignment, rotate the drivetrain by hand to check for runout and smooth engagement, then secure retaining hardware to the helicopter maker's recommended torque values. After assembly, recheck gear mesh at static and idle rotor speeds and verify fasteners after the initial flights.

Tuning considerations: the 95T gear determines head speed and torque relative to pinion size, so altering pinion teeth or pitch will change rotor RPM and response; update throttle curves or governor settings as required and keep an eye on bearing temperatures and drivetrain noise during break-in runs.