B-MAX4 Diff Ring Gear Pair for Differential Rebuilds - Yokomo BM-503  [BM-503]

Yokomo BM-503 Diff. Ring Gear for B-Max4
Price:
£2.54
Brand:
Yokomo
Model:
BM-503
GTIN:
3888
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Ring Gear BM-503 Overview for B-MAX4

The Yokomo BM-503 is a direct replacement diff ring gear intended for use in B-MAX4 RC differential assemblies. This item is supplied as two ring gears and is designed for scale model differential rebuilds and routine maintenance rather than any real vehicle application.

Replacing a worn ring gear on a B-MAX4 helps restore correct gear engagement and reduces drivetrain noise. The BM-503 pair is suitable for maintenance cycles and when components are serviced or upgraded.

Installation notes: confirm flush seating of the ring gear on the diff case, adjust pinion-to-ring mesh using appropriate shims for your spur and pinion, and check the assembly spins freely before final assembly. Use OEM-spec bearings and hardware for the B-MAX4 to ensure correct fit.

Packing includes

  • Diff Ring Gear x 2 pcs
Remark :
Due to limited stock availability, please notice that some Yokomo items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

How often should I replace the ring gear on a B-MAX4?

Replacement interval depends on use and loads; inspect for pitting, uneven wear, or chipped teeth and replace when wear affects mesh or noise increases.

What are signs the BM-503 was not installed correctly?

Signs include rough rotation, excessive backlash, abnormal noise under load, or visible gaps between the ring gear and diff housing; if observed, disassemble and check seating and fastener torque.

Can I reuse the original bearings when fitting these gears?

If the bearings are in good condition with no play or roughness they can be reused, but replacing bearings during a rebuild is recommended to ensure reliable long term performance.

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