AILEETE trimmer gear head 4137-640-0100 in box ready for replacement
Close-up of AILEETE gear head assembly showing gears and components
AILEETE trimmer gear head on a Stihl FS series machine
AILEETE gear head with thrust washer and rider plate for alignment
AILEETE gear head includes collar nut for secure installation

AILEETE

AILEETE Trimmer Gear Head 4137 640 0100 for Stihl: FS55, FS90, FS130 & More

High-performance patio lawn and garden made for confident daily results

$35.87

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Why customers choose PatioZora Garden

Elevate your Stihl trimmer with the AILEETE Gear Head 4137 640 0100

Replace worn gear heads with a complete, ready-to-install assembly designed for reliable yard work. The AILEETE Trimmer Gear Head 4137 640 0100 includes gears, thrust washer, rider plate, and a collar nut, all arranged for smooth operation and easy maintenance.

This replacement part is designed to align with several OEM numbers (4137 640 0100, 4130 640 0100, 4130 641 0300) and fits a broad range of Stihl backpack and handheld units. If your trimmer experiences inconsistent line feeding, gear backlash, or gear wear, this head offers a practical option to refresh performance without a full tool replacement.

What’s included

  • Replacement Trimmer Gearbox Head Assembly
  • Gears, Thrust Washer, Rider Plate, Collar Nut
  • Ready-to-install unit that replaces the OEM part numbers

Compatibility and fit

  • Fits Stihl models across the FS and FR series (e.g., FS25-4 through FS90R, FS94, FS100R, FS130R, FS200, FS240, FS250)
  • Designed for backpack, handheld, Kombi tools, and pole saw configurations

Real-world use scenarios include seasonal lawn maintenance, edging along sidewalks, and clearing dense undergrowth in small to medium yards. The gear head’s gear train provides a balance of strength and speed, while the included components help ensure proper alignment and secure attachment during operation. While performance can vary with setup, many users report smoother operation and easier maintenance after replacing worn parts with this kit.

Buying with confidence

When choosing a replacement, the AILEETE kit offers a comprehensive solution: a complete gear head and the essential hardware to reassemble your trimmer quickly, with parts sourced to align with common OEM numbers. Consider this option if you want a single, compatible upgrade for multiple Stihl models.

FAQ

Q: Which Stihl models is the AILEETE Trimmer Gear Head 4137 640 0100 compatible with?

A: Compatible models include many in the FS and FR series listed in the description for broad coverage.

Q: What parts are included with this gear head kit?

A: The kit includes the gear head with gears, thrust washer, rider plate, and collar nut for a ready-to-install replacement.

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