Products Description
Brush Cutter FS90/FS110/FS130 Gear Case 25.4 x 4T – Direct Replacement Gearbox Assembly
Complete Gearbox Head for STIHL FS90, FS110, FS130 & Compatible Brushcutters
This gear case is a direct replacement gearbox assembly for STIHL FS90, FS110, FS130, and a wide range of compatible brushcutters and trimmers. The gearbox is the critical component that transfers power from the driveshaft to the cutting attachment, featuring a 25.4mm (1 inch) tube diameter and a 4-spline square drive shaft for secure attachment and efficient power transmission. Over time, gearboxes can suffer from wear, damaged gears, or bearing failure, leading to noisy operation, vibration, or complete loss of drive. This replacement assembly restores full cutting function and smooth operation, making it an essential component for professional landscaping and grounds maintenance equipment.
Technical Profiles & Materials
OEM-Spec Replacement Fitment – This gearbox assembly is a direct replacement for STIHL genuine part number 4137 640 0100. It is designed to meet original equipment specifications, ensuring perfect fitment and reliable performance on compatible models.
25.4mm Drive Tube Diameter – The 25.4mm (1 inch) tube diameter is the standard size for this class of STIHL brushcutter, ensuring proper fitment with the drive shaft assembly.
25.4 x 4T Square Drive Shaft – Features a square drive shaft measuring 25.4mm with 4 splines (4T) for secure engagement with the cutting attachment. This configuration ensures positive power transfer and reduces the risk of slippage during heavy-duty cutting.
M10 x 1.0 Left-Hand Thread Output – The output shaft features an M10 x 1.0 left-hand thread, which is the standard specification for many STIHL brushcutters. The left-hand thread is designed to self-tighten during operation, preventing the cutting attachment from loosening.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Drive Tube Diameter | 25.4 mm (1 inch) |
| 2 | Drive Shaft Type | Square, 4 spline (4T) |
| 3 | Output Thread | M10 x 1.0 Left-Hand Thread |
| 4 | OEM Part Number | 4137 640 0100 |
| 5 | Alternative OEM Ref. | 4180 640 0114 (later models) |
| 6 | Weight (Typical) | Approx. 0.71 – 0.75 kg |
| 7 | Material | Durable cast metal housing |
| 8 | Unit of Sale | 1 complete gearbox assembly |
| 9 | Fitment Note | Check your machine's drive tube diameter and serial number for compatibility |
Products Application
Brushcutter Gearbox Replacement
Direct replacement when the original gearbox becomes worn, noisy, or fails to transfer power to the cutting attachment. Common symptoms include grinding noises, excessive vibration, or the cutting head not rotating. This gearbox restores full cutting function on FS90, FS110, FS130, and compatible models used in professional landscaping and grounds maintenance.
Preventative Maintenance for Commercial Fleets
For landscaping contractors and grounds maintenance crews operating multiple STIHL brushcutters, keeping a replacement gearbox on hand minimizes downtime. The pre-assembled unit allows for quick field replacement, ensuring equipment is back in service with minimal interruption.
Workshop & Repair Service
For repair centres servicing STIHL brushcutters, this gearbox assembly simplifies repairs by providing a complete drop-in replacement. This eliminates the need to rebuild individual gear components, reducing service time and ensuring consistent repair quality.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm this gear case fits my FS90, FS110, or FS130?
A:Check your machine's drive tube diameter (25.4mm) and the OEM part number on your existing gearbox. This gearbox replaces OEM number 4137 640 0100 and fits an extensive range of STIHL models, including FS90, FS110, FS130, FS80, FS85, FS100, FS120, FS200, FS240, FS250, and many others. For later models (e.g., FS94 after serial no. 514309587), the alternative OEM number 4180 640 0114 may be required.
Q: What is the difference between the 25.4mm and other drive tube sizes?
A: The 25.4mm (1 inch) drive tube diameter is the standard size for the FS90/FS110/FS130 class of STIHL brushcutters. Some smaller or older models may use a different tube diameter. Always measure your existing drive tube to confirm 25.4mm compatibility before ordering.
Q: Does the gearbox come with the output shaft nut and washers?
A: Typically, the complete gearbox assembly includes the gear housing, internal gears, bearings, thrust washer, support plate, and ring nut. However, it is recommended to check the specific product listing for exact contents. Some suppliers may sell the gearbox as a bare unit without the output nut.
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