4137 640 0100 Gear Box For Stihl FS44 FS65 FS72 FS74 FS75 FS76 FS80

Product Overview

This gear box is a direct replacement drive head for STIHL FS-series trimmers and brushcutters. It transfers engine power to the cutting attachment, ensuring reliable operation in demanding yard work.

Key Features & Performance

• Constructed from high-strength aluminum and steel for durability
• Precision-ground gears reduce noise and improve efficiency
• Sealed design keeps out dirt and grass clippings
• Easy bolt-on installation using existing hardware
• OEM-equivalent quality for seamless performance

Fitment & Compatibility

• STIHL FS44
• STIHL FS65
• STIHL FS72
• STIHL FS74
• STIHL FS75
• STIHL FS76
• STIHL FS80

Common Uses

• Replacing worn or damaged gear boxes on STIHL string trimmers
• Restoring cutting performance in residential and commercial lawn care
• Maintaining brushcutters for heavy vegetation clearing
• Upgrading older equipment with a factory-spec component

Technical Specifications

• Part Number(s): 4137 640 0100
• Material: Aluminum housing with steel gears
• Weight: Approx. 0.5 lbs

Frequently Asked Questions

Q: Will this gear box fit my STIHL FS55? A: This gear box is specifically designed for FS44, FS65, FS72, FS74, FS75, FS76, and FS80 models; other models may require different part numbers.

Q: Does the gear box come pre-greased? A: Yes, it is factory-packed with lubricant and ready for installation.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.