Product Description
Shimano 10J70 Idle Gear (BNT2152) | Level Wind Drive Component
The Shimano 10J70 Idle Gear is an essential internal transmission component responsible for the synchronization of the level wind system in your Shimano baitcasting or conventional reel. This nylon gear transfers rotational power from the main drive train to the worm shaft, ensuring that the line guide moves smoothly across the spool for an even line lay.
Designed as a "sacrificial" part, the 10J70 is engineered to strip its teeth if the level wind becomes jammed (by debris or a finger), protecting the more expensive metal gears in your reel from terminal damage. If your line guide has stopped moving or "skips" during the retrieve, replacing this idle gear is the standard repair procedure.
Product Specifications
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Part Name: Idle Gear / Level Wind Drive Gear
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Shimano Part Number: 10J70
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Alternate Part Number: BNT2152
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Material: High-Density Industrial Nylon
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Placement: Intermediate gear between the drive gear and worm shaft.
Compatible Reel Models
The 10J70/BNT2152 is a widely used part across several of Shimano's most popular round reel and trolling platforms. It fits the following series:
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Shimano Calcutta: CT200D, CT201D, CT300D, CT301D, CT400D, CT401D.
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Shimano Cardiff: CDF300, CDF300A, CDF400, CDF400A (including Left-Hand models).
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Shimano Corvalus: CVL300, CVL400.
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Shimano Tekota: TEK300, TEK500, TEK600 (Non-LC and LC models).
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Shimano Catala: Select 300 and 400 series models.
Technical Tip: Because this gear is critical for timing, always verify its position by downloading the specific PDF schematic for your model at www.reelschematic.com.
Maintenance & Lubrication Recommendation
Since the 10J70 is a nylon-based gear, it requires a lubricant that stays in place and does not degrade plastic components. For the best performance and gear longevity, we recommend Deuthlon Lubricants:
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For the Gear Teeth: Apply Deuthlon Reel Gear Grease. Its high-tack, low-friction formula is specifically designed to provide a smooth mesh between plastic and metal gears while resisting water wash-out.
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For the Shaft/Bushing: A drop of Deuthlon Power Cast Oil on the post where the idle gear sits will ensure it spins with zero resistance, reducing the load on your reel's handle.
Why Choose Genuine Shimano 10J70 Parts?
Using the original BNT2152 ensures the exact tooth pitch and diameter required for your reel's specific gear ratio.
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Safety First: Maintains the "break-away" protection that saves your main gear during a jam.
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Silent Operation: Precision molding eliminates the "whirring" noise often found in generic aftermarket gears.
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UV & Chemical Resistance: Genuine Shimano nylon is treated to resist the breakdown caused by modern braided line treatments and cleaning agents.
