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- 4138 640 7303 STIHL Set of Pinions 1.27 – Genuine OEM Part
Description
4138 640 7303 STIHL Set of Pinions 1.27 – Genuine OEM Part
The STIHL Set of Pinions 1.27 (4138 640 7303) is a genuine OEM replacement gear set designed for use in the gear head assemblies of select STIHL HT-series pole pruners and HT-KM pole pruner attachments. This pinion set plays a critical role in transferring power through the gear head for smooth, efficient cutting performance.
Manufactured to STIHL’s exact factory specifications, this OEM pinion set ensures proper fitment, reliable gear engagement, and long-lasting durability when replacing worn or damaged internal gear components.
Product Details
OEM Part Number: 4138 640 7303
Brand: STIHL (Genuine OEM)
Part Type: Set of Pinions (Gear Set)
Specification: 1.27
Application: Gear Head / Drive Tube Assembly
Condition: New Genuine OEM Part
Function
This pinion set is designed to:
Transfer power efficiently through the gear head assembly
Maintain smooth gear engagement and reliable cutting performance
Replace worn, stripped, or damaged pinion gears
Restore proper drive function in pole pruner gear heads
Support long-lasting professional equipment performance
⚠️ Worn pinions may cause slipping, grinding, or loss of drive to the cutting chain.
Verify Fitment in 30 Seconds
Before ordering, confirm the following:
OEM part number 4138 640 7303
Pinion specification 1.27
Your STIHL model is listed below
Part location matches your gear head diagram
⚠️ Always verify fitment by OEM part number for best accuracy.
Compatibility
Fits select STIHL pole pruners and attachments, including:
Pole Pruners / Long-Reach Units
HT 70 (Gear Head / Drive Tube Assembly HT 75)
HT 75 (Gear Head / Drive Tube Assembly HT 75)
HT 100 (Gear Head – 11.2005)
HT-KM Pole Pruner (Gear Head – 42.2005)
HT (Gear Head – 42.2005)
HT-KM (Gear Head – 42.2005)
⚠️ This list includes common applications — always confirm using your parts diagram or owner’s manual.
Installation / Usage
Turn off engine before servicing
Disassemble the gear head assembly carefully
Remove worn or damaged pinions
Install STIHL OEM set of pinions 4138 640 7303
Reassemble gear head and ensure correct lubrication
Test operation before use
⚠️ Gear head service may require mechanical experience — professional installation is recommended if unsure.
Maintenance Tips
Keep gear head properly lubricated with recommended grease
Inspect gears regularly for wear or damage
Replace pinions immediately if slipping or grinding occurs
Use only genuine STIHL OEM internal gear parts for best reliability
