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- 4138 640 1704 STIHL Chain Sprocket Cover – Genuine OEM Replacement
Description
4138 640 1704 STIHL Chain Sprocket Cover – Genuine OEM Replacement
The STIHL Chain Sprocket Cover (4138 640 1704) is a genuine OEM replacement cover designed for use on select STIHL HT-series pole pruners. This cover protects the chain sprocket and associated drive components from debris, impacts, and wear, ensuring smooth operation and long service life.
Manufactured to STIHL’s exact factory specifications, this OEM chain sprocket cover provides correct fitment, durable construction, and dependable protection when replacing worn, cracked, or missing covers.
Product Details
OEM Part Number: 4138 640 1704
Brand: STIHL (Genuine OEM)
Part Type: Chain Sprocket Cover
Application: Pole Pruner Gear Head / Drive Tube Assembly
Condition: New Genuine OEM Replacement Part
Function
This chain sprocket cover is designed to:
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Shield the chain sprocket and drive components from debris and impact
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Prevent premature wear of internal parts
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Maintain smooth, reliable cutting performance
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Replace worn, cracked, or missing covers
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Restore proper protection and prolong equipment life
⚠️ A damaged or missing cover can allow debris to enter and accelerate wear or cause component failure.
Verify Fitment in 30 Seconds
Before ordering, confirm the following:
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OEM part number 4138 640 1704
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Your STIHL model is listed below
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Part location matches your gear head / sprocket cover area diagram
⚠️ Always verify fitment by OEM part number for best accuracy.
Compatibility
Fits the following STIHL pole pruner models:
HT 56 C-E
HT 101
HT 131
HT 250
⚠️ This list includes common applications — always confirm using your parts diagram or owner’s manual.
Installation / Usage
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Turn off engine before servicing
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Remove the old or damaged chain sprocket cover
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Clean the area of debris before installing the new cover
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Install STIHL OEM chain sprocket cover 4138 640 1704
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Secure all fasteners and check alignment
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Test safe operation before use
⚠️ Professional installation is recommended if unsure.
Maintenance Tips
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Inspect the chain sprocket cover regularly for cracks or damage
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Clean debris buildup to prevent abrasion
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Replace worn covers immediately to protect internal components
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Use only genuine STIHL OEM parts for best reliability

