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Description
4180 640 0105 Gear Head | Genuine STIHL OEM Replacement
The 4180 640 0105 Gear Head is a genuine STIHL OEM replacement component designed for compatible STIHL lawn edgers and KombiSystem attachments. The gear head transfers rotational power from the drive shaft to the cutting attachment while maintaining the proper gearing and alignment required for efficient edging.
This gear head is used across several FC, FCA, and FCB-KM models.
Features That Make a Difference
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Genuine STIHL OEM replacement part
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Part Number: 4180 640 0105
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Alternate Part Number: 41806400105
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Product Type: Gear Head
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Designed for compatible STIHL edgers and KombiSystem attachments.
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Transfers rotational power from the drive shaft to the cutting attachment.
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Helps maintain proper cutting-head alignment.
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Designed to work with the applicable drive-tube assembly.
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OEM construction provides proper fit and reliable operation.
Benefits
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Replaces a worn, damaged, or malfunctioning gear head.
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Helps restore power transmission to the cutting attachment.
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Supports smooth and consistent cutting performance.
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Helps maintain proper drive-shaft and cutting-head alignment.
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Genuine STIHL design helps ensure correct fit.
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Ideal for professional equipment repair and maintenance.
Specifications
| Specification | Details |
|---|---|
| Part Number | 4180 640 0105 |
| Alternate Part Number | 41806400105 |
| Product Type | Gear Head |
| Brand | STIHL |
| System | Drive Tube / Gear Head |
| Applications | FC / FCA / FCB-KM |
| Function | Power Transmission |
| Use | Repair / Replacement |
| Part Type | Genuine OEM Replacement |
Compatibility
The 4180 640 0105 Gear Head is listed for:
FC Series Edgers
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FC 56 C-E — Drive tube assembly, loop handle, gear head
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FC 70 — Drive tube assembly, loop handle, gear head
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FC 70 C-E — Drive tube assembly, loop handle, gear head
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FC 90 — Drive tube assembly, gear head
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FC 91 — Drive tube assembly, gear head
FCA Attachments
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FCA 80.0 — Drive tube assembly, gear head, deflector
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FCA 135 — Drive tube assembly, gear head, deflector
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FCA 135.0 — Drive tube assembly, gear head, deflector
KombiSystem
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FCB-KM 4180 — FCB-KM gear head
Always verify your exact STIHL model, serial number, attachment configuration, and original gear-head part number before ordering to ensure compatibility.
How the Gear Head Works
The gear head is positioned at the end of the drive tube and connects the rotating drive shaft to the cutting attachment.
The drive shaft delivers rotational power into the gear head, where the internal gears transfer that power to the cutting head at the required speed and direction. This allows the cutting attachment to operate efficiently while maintaining the correct alignment.
Signs of a Worn Gear Head
A gear head may require inspection or replacement if you notice:
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Grinding or unusual mechanical noise.
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Excessive vibration at the cutting head.
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Reduced power reaching the cutting attachment.
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Excessive play in the cutting head.
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Difficulty rotating the cutting attachment.
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Gear oil leakage or visible damage.
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Abnormal wear in the drive assembly.
Why Replace the Gear Head?
The gear head is a critical part of the power-transmission system. Internal gears and bearings can wear over time, particularly with heavy professional use or insufficient lubrication.
Replacing a damaged gear head with the correct STIHL OEM component helps restore reliable power transmission and proper cutting-head operation.
Important: Gear-head installation should follow the applicable STIHL service procedure, including correct lubrication and torque specifications.
Why Buy from Barry’s Power Equipment?
Barry’s Power Equipment provides quality OEM and replacement parts for lawn, garden, and outdoor power equipment.
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Genuine OEM replacement parts
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Quality products for residential and commercial equipment
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Competitive Pricing
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Fast Shipping
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Expert Customer Support
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Reliable parts for professional equipment repair and maintenance
Restore the power-transmission system of your compatible STIHL edger or KombiSystem attachment with the STIHL 4180 640 0105 Gear Head, a genuine OEM replacement for select FC, FCA, and FCB-KM applications.






