Description
Overview:
This Tension Spring is a genuine Stihl spare part for professional chainsaws, designed to keep critical mechanisms working at the correct preload throughout use. Built from durable metal in a helical coil with looped ends, it replaces worn or fatigued springs to restore consistent performance. It helps maintain reliable operation under vibration and load, supporting safe and efficient cutting. Suitable for Stihl MS 651 and MS 661 series machines, it is a direct replacement for OEM No. 0000 997 5520 (MPN 0000 997 5520). Whether you are a tradesperson, arborist, or a DIY user maintaining your saw, this straightforward replacement part helps minimise downtime and extends the service life of surrounding components by holding the correct tension where specified.
Key Features:
- Genuine Stihl part for assured compatibility and fit
- Direct replacement for OEM No. 0000 997 5520 (MPN 0000 997 5520)
- Durable metal spring designed for repeated cycles under load
- Helps maintain correct system tension for consistent cutting performance
- Supports safe operation by reducing slack and unintended movement
- Like-for-like swap with the original spring using standard hand tools
- Stable performance under vibration typical of high-power chainsaws
- Helps reduce premature wear on related parts by keeping assemblies set correctly
Typical Applications:
Used during routine servicing or repair of Stihl MS 651/MS 661-series chainsaws to replace a stretched, broken, or weakened tension spring. Suitable for workshop rebuilds, field repairs, and preventative maintenance on saws used in forestry, arboriculture, construction sites, grounds maintenance, and firewood processing, where dependable running and quick turnaround are important.
Also known as:
Coil spring, helical spring, pull spring, traction spring, service spring for chainsaw mechanisms, return-type tension coil.
Fits Models:
MS 651, MS 661, MS 661 C, MS651, MS661, MS661C
Alternate Part Numbers:
0000-997-5520, 00009975520
Product Specifications
| L&S Part No. | 0000 997 5520 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 00009975520 |
| Unit of Sale | 1 |
| Applications | MS 651, MS 661, MS 661 C, MS651, MS661, MS661C |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Fits Models | MS651 | MS661, MS661C |
