The Yokomo BM-504 drive gear supplied with a header card serves as a service replacement for B-MAX4 input shaft applications. Delivered as two pieces, it is intended to assist hobbyists performing wear inspections and scheduled gearbox servicing.
The gear transmits motion from the input shaft through the gearbox train and is provided for inventory control via the header card. Fitting the gear involves removing the transmission cover, extracting the worn gear, and seating the new unit while retaining any original spacing components to preserve alignment.
Keep this part on hand for wear-related replacements or to ensure matched spare gears are available when conducting regular maintenance cycles or preparing for extended running sessions.
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