Compatible with TSURUGI SX: 95T Main Gear HI0404512 by Hirobo  [HI0404512]

95T Main Gearspec for TSURUGI SX

The Hirobo HI0404512 main gear is supplied as an RC transmission replacement for TSURUGI SX helicopter platforms. It conveys motor torque through the main gearbox to the rotor head, and the 95T tooth count governs the mesh and ratio relationship with the chosen pinion.

Fitment and role: confirm the replacement matches the TSURUGI SX main shaft dimensions and keeps the correct centre distance to the pinion; the 95T tooth count determines the intended tooth engagement and drive ratio for common TSURUGI SX arrangements. Check the mating pinion, wave washers and spacers for wear prior to final fitment.

Installation notes: fit the gear dry to check backlash and alignment, rotate the drivetrain by hand to detect runout and smooth engagement, then tighten retaining hardware to the helicopter manufacturer's torque recommendations. After fitting, verify gear mesh at idle rotor speed and recheck all fasteners after initial flights.

Tuning considerations: the 95T gear establishes the base drive ratio, so altering pinion tooth count or position will change head speed and torque under load; adjust governor or throttle settings where fitted and watch bearing temperatures and drivetrain noise during the run-in period.