Description
Overview:
This oil pump worm is the drive gear that powers the chain oiler on Stihl petrol chainsaws. It transfers rotation to the pump so bar and chain oil is delivered consistently during cutting. Made from a durable, wear‐resistant polymer, it is designed for dependable service in demanding forestry and site work. This is a Genuine Stihl part (MPN 1144 640 7101) for accurate fit and long life. It is a direct replacement for the original worm in Stihl MS 651 and MS 661 models, maintaining correct lubrication rates and helping to protect the guide bar, chain and clutch from premature wear. Suitable for professional users and DIY owners who want reliable lubrication performance with straightforward maintenance.
Key Features:
- Genuine Stihl component for assured fit and quality (MPN 1144 640 7101)
- Robust polymer gear for excellent wear resistance and reliable service life
- Maintains correct oil flow to bar and chain to reduce friction and heat build-up
- Direct-fit replacement for MS 651 / MS 661 / MS 661 C with no modification required
- Stable performance across a wide temperature range and cutting conditions
- Helps cure poor oiling caused by a worn or stripped original worm drive
- Smooth, efficient drive to the pump for consistent lubrication output
- Supports proper chain lubrication to extend bar and chain lifespan
- Compact, lightweight part that is straightforward to install with basic tools
- OEM geometry for accurate engagement with the pump and clutch assembly
Typical Applications:
Routine maintenance or repair of the chain oiling system on Stihl MS 651 and MS 661 saws. Ideal when the chain is running dry, oil output is low or intermittent, or after clutch-side servicing. Suited to forestry, tree surgery, firewood processing, construction site use and general land management.
Also known as:
Oil pump gear, oiler drive gear, pump drive worm, lubrication worm gear, chain oiler worm drive, oiling worm.
Fits Models:
MS 651, MS 661, MS 661 C, MS651, MS661, MS661C
Alternate Part Numbers:
1144-640-7101, 11446407101
Product Specifications
| L&S Part No. | 1144 640 7101 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11446407101 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl part ensures accurate fit (MPN 1144 640 7101) - Durable polymer construction for wear resistance - Direct replacement for MS 651 and MS 661 models - Maintains correct oil flow to bar and chain - Supports consistent lubrication in varied conditions |
| Fits Models | MS651 | MS661, MS661C |
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