Hirobo HI0404316 5MM Miter Gear Replacement for Eagle, Freya, EX, SX Helicopters  [HI0404316]

Precision 5mm miter gear for helicopter drivetrains

This Hirobo HI0404316 5MM miter gear is an RC-scale replacement listed for Eagle, Freya, EX and SX helicopter families. It is used as a service item where a 90-degree gear interface is required, matching the 5mm gear dimension shown in the part name.

Installation emphasizes correct alignment and mesh instead of torque settings. Remove the worn gear, inspect adjacent bearings and shafts for wear, fit the new miter gear to preserve straight shaft geometry, then tighten the mounting fasteners. Hand-rotate the assembly to confirm freedom of movement before applying power, and complete a low-speed run to check for binding or excessive backlash.

During setup and routine checks the miter gear impacts drivetrain smoothness and vibration. Correct mesh and healthy bearings reduce noise and premature wear, so include this gear in inspections and replace it if you find scoring, chipped teeth, or uneven meshing on bench tests.