Description
Overview:
This Spur Gear / Chain Adjusting Screw Kit is a Genuine Stihl OEM replacement for the chain tensioning mechanism on a range of Stihl chainsaws, including the MS311 and MS391. Supplied under MPN 1127 007 1003, the kit includes a durable polymer spur gear and a robust steel adjusting screw that work together to move the guide bar for precise chain tension. Correct tension helps reduce bar, sprocket and chain wear, improves cutting accuracy, and supports safe operation. Designed to fit the factory tensioner housing on compatible models, the parts integrate cleanly with existing hardware for reliable performance. Ideal for restoring smooth, positive adjustment when original components are worn or stripped, keeping your saw ready for regular forestry, farm, landscaping, and property maintenance tasks.
Key Features:
- Genuine Stihl OEM kit for assured fit and function
- Includes spur gear and adjusting screw for the complete tensioning drive
- Hard-wearing polymer gear and corrosion-resistant steel screw for long service life
- Positive, smooth engagement for accurate chain tension settings
- Helps prevent chain slippage and excessive wear on bar and drive components
- Maintains consistent performance during heavy-duty cutting work
- Direct replacement for worn or damaged parts to restore adjustment range
- Compatible with a wide group of mid-range Stihl saws (see model list)
- Simple to fit with standard workshop tools
- Suitable for routine maintenance schedules and preventative repairs
Typical Applications:
Used to refurbish the chain tensioning system on Stihl chainsaws that see regular service in forestry, tree surgery, landscaping, estate management, agriculture, firewood processing, and construction site duties. Replacing the spur gear and screw restores smooth bar movement and precise chain tension, supporting cleaner cuts, reduced vibration, and dependable day-to-day operation.
Also known as:
Chain tensioner set, bar adjuster kit, worm gear and screw, chain tension worm, tensioning gear and screw assembly, chain bar adjuster, side tensioner kit, chain tension drive, chain adjust screw and gear.
Fits Models:
029, 030, 031, 039, MS 271, MS 271 C, MS 290, MS 291, MS 291 C, MS 310, MS 311, MS 390, MS 391
Alternate Part Numbers:
1127-007-1003, 11270071003
Product Specifications
| L&S Part No. | 1127 007 1003 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11270071003 |
| Unit of Sale | 1 |
| Applications | 029, 030, 031, 039, MS 271, MS 271 C, MS 290, MS 291, MS 291 C, MS 310, MS 311, MS 390, MS 391, MS271, MS271C, MS290, MS291, MS291C, MS310, MS311, MS390, MS391 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Fits Models | MS290, MS310, MS390 | 030, 031 | 029, 039 | MS271, MS271C, MS291, MS291C | MS311 | MS391 |
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