Product Description
Daiwa B78-9501 Drive Gear | Main Gear Replacement
Part Name: Drive Gear (Main Gear) Part Number: B78-9501 Manufacturer: Daiwa
Product Overview
Restore the cranking power and smooth retrieval of your heavy-duty Daiwa spinning reel with the Daiwa B78-9501 Drive Gear. This genuine replacement part is the central engine of your reel, transferring handle rotation to the pinion gear and rotor.
Designed for the large-frame Regal and Procaster series (4500/5000 sizes), this main gear is precision-cut to withstand the high torque required for surf casting and heavy freshwater applications. If your reel feels "gear-y," grinds during retrieval, or slips under load, a worn drive gear teeth is the likely culprit.
Model Compatibility
This part is engineered for specific large-frame Daiwa spinning reels manufactured in the mid-to-late 1990s. It fits the following models:
- Daiwa EL Series:
- EL2600X
- EL4000X
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Daiwa Regal-Z Series (BL & T Models):
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RG-Z4500BL
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RG-Z5000BL
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RG-Z4500T
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RG-Z5000T
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Daiwa Regal-S Series:
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RG-S4500T
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RG-S5000T
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-
Daiwa Procaster Series:
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PS4000BL (Check schematic for specific sub-model compatibility)
-
-
Daiwa SK Series:
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SK4050 (Silver King) - Verify schematic as some production runs vary.
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Technical Specifications & Reference
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Material: Cast Alloy / Zinc
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Installation Location: Main Body (Gear Box)
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Function: Transmits handle force to the Pinion Gear and Oscillating Slider.
Alternate Part Numbers:
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mikesreelrepair.com: B78-9501
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Related Parts: Often replaced with the Pinion Gear (Check schematic, often L10-7701 or similar) and Drive Gear Washer (371-2824).
Technician's Note: Gear replacement is best done in sets. If your Drive Gear is worn, your Pinion Gear likely has matching wear patterns. Installing a new drive gear with an old pinion can result in noise and premature wear. Always apply a quality reel grease to the teeth during installation. For the exact part location, please consult the schematics at www.reelschematic.com.
