SX Damper Collar Replacement Hirobo HI0404506  [HI0404506]

Component Details

The Hirobo HI0404506 damper collar serves as the retaining ring that positions the damper shaft within the shock unit on Eagle, Freya, EX and SX helicopters. Its primary purpose is to keep the shaft aligned so the damper delivers repeatable response in flight.

Inspect this mechanical collar for burrs, wear, and correct seating rather than any electrical traits. When refitting, make sure the collar bears evenly on the housing, the shaft runs true, and the original retention method is reapplied to avoid loosening during use.

From a durability standpoint, replacing a worn collar restores predictable compression and rebound behaviour, making oil and spring preload changes more consistent. Keeping spare collars in your toolbox reduces downtime at flying sessions.