Main Gear Upper for XRB SR Helicopters - Hirobo HI0301043  [HI0301043]

HIROBO 0301-043 XRB SR MAIN GEAR UPPER #0301043
Price:
£10.74
Brand:
Hirobo
Model:
HI0301043
GTIN:
4512895140489
Condition:
Brand New
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Main Upper Gear — XRB SR Fitment

The Hirobo HI0301043 upper main gear is an RC replacement component made for XRB SR helicopter platforms. It replaces the upper portion of the main transmission gear assembly to restore correct mechanical engagement when the original component is degraded.

Installation notes: check that the gear locates correctly on the main shaft, confirm axial and radial alignment before final tightening, inspect surrounding bearings and mating gear teeth, and use appropriate fastener torque when securing the part.

Maintenance and setup role: installing a fresh upper main gear corrects mesh errors and helps suppress vibration introduced by worn gear surfaces, making it a recommended service item during pre-flight checks on XRB SR helicopters.

How can I verify this is the correct part for my airframe?

Confirm HI0301043 against your parts list and compare the gear profile to the removed unit. Checking dimensions and engagement points on the bench helps ensure compatibility.

Are there any post-install checks to run?

After installation, verify mesh clearance and shaft runout, re-torque fasteners as required, and carry out a slow rotation test to confirm smooth operation before flight.

Should I replace associated bearings when I change the gear?

If bearings show play or roughness during inspection, replace them while the gearbox is open to avoid premature failure and to ensure correct mesh and alignment.

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