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Description
4124 640 7300 STIHL Set of Pinions – Genuine OEM Part
The STIHL Set of Pinions (4124 640 7300) is a genuine OEM replacement gear component designed for use in the gear head assemblies of select STIHL brushcutters and trimmers. This pinion set plays a critical role in transmitting power from the drive shaft to the cutting attachment, ensuring smooth and efficient operation.
Manufactured to STIHL’s exact specifications, this OEM pinion set ensures proper fitment, reliable gear engagement, and long-lasting durability when replacing worn or damaged gearbox components.
Product Details
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OEM Part Number: 4124 640 7300
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Brand: STIHL (OEM)
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Part Type: Set of Pinions
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Application: Gear Head / Gearbox Assembly
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Condition: New Genuine OEM Part
Function
This set of pinions is designed to:
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Transfer engine power through the gear head system
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Support smooth gear engagement and cutting performance
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Replace worn, stripped, or damaged pinion gears
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Restore proper gearbox operation
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Maintain correct drive and torque transmission
⚠️ Damaged pinions may cause gear slipping, abnormal noise, or loss of cutting power.
Verify Fitment in 30 Seconds
Before ordering, confirm the following:
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OEM part number 4124 640 7300
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Part location: gear head / gearbox assembly
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Compatible STIHL model listed below
⚠️ Always verify fitment by OEM part number for best accuracy.
Compatibility
Fits STIHL equipment including:
Brushcutters / Trimmers (Gear Head Applications)
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FS 72 R (FS 76: Gear head, Drive tube assembly)
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FS 74 (FS 76: Gear head, Drive tube assembly)
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FS 76 (Gear head, Drive tube assembly)
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FS 81 (Gear head FS 81)
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FS 86 (Gear head FS 81)
⚠️ This list includes common applications — always confirm using your parts diagram or owner’s manual.
Installation / Usage
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Turn off engine and allow it to cool completely
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Remove the gear head housing carefully
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Disassemble gearbox components as needed
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Replace worn pinions with the new STIHL OEM set
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Reassemble gear head and refill grease if required
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Test operation before returning equipment to service
Maintenance Tips
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Inspect gear head components regularly for wear
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Keep gearbox properly greased to prevent premature damage
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Replace worn gears immediately to avoid further failure
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Clean debris from gear head area after heavy use
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Use only genuine STIHL replacement parts for best fit and reliability
