This lower rotor head assembly is an RC-scale replacement part designated by Hirobo as HI0301041 and identified for use with XRB SR series helicopters at length L=125. It functions as the lower hub where blade grips and the lower swash linkage engage, so wear or play here can degrade rotor tracking and cyclic precision.
Installation guidance: confirm the part fits the existing upper and lower linkage geometry before final assembly, align blade grips to the original orientation, and inspect adjacent ball bearings and link pins for signs of wear. Adhere to the helicopter manufacturer’s recommended torque settings and use a medium-strength threadlocker on fasteners if appropriate.
Tuning role: renewing the lower rotor head often reduces slack in the rotor train and delivers crisper pitch response, which supports finer trim and cyclic tuning during flight checks. After fitting, perform static blade tracking and a cautious hover test at low throttle to ensure correct setup and balance.
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