Description
Overview:
This Bearing C/Case is a genuine Stihl crankcase bearing designed for the MS 311 and MS 391 chainsaws. It supports the crankshaft within the crankcase, reducing friction and ensuring smooth, concentric rotation under high engine speeds. Manufactured from high‐grade steel with precision‐ground races, it is built to handle heat, vibration, and the oil/fuel environment typical of two‐stroke engines. By maintaining correct crankshaft alignment, it helps preserve cutting performance and reliability in demanding work. Identified by OEM number 9523 003 4304, this bearing offers an accurate fit and dependable service life for users who need their saws to perform day in, day out, whether on site or in the garden.
Key Features:
- Genuine Stihl part for assured fit and performance (OEM 9523 003 4304)
- Direct replacement for worn or damaged crankcase/main bearings
- Precision tolerances to maintain correct crankshaft alignment and smooth running
- Robust steel construction for durability in high‐RPM two‐stroke engines
- Helps reduce vibration and wear on adjacent components (flywheel, clutch side)
- Stable performance in hot, oily operating conditions
- Consistent, low‐friction rotation to support power delivery and throttle response
- Straightforward installation using standard workshop tools and procedures
- Suitable for heavy‐duty, frequent use across forestry, arborist, and landscaping tasks
- Clearly marked part number for easy identification and reordering
Typical Applications:
Used during engine overhauls or repairs when there is crankshaft play, roughness when spinning, or noise from the main bearings. Ideal for restoring smooth operation after high hours, heavy cutting, or exposure to contamination. Supports reliable running for firewood processing, estate maintenance, felling, and general site work.
Also known as:
Crankcase bearing, main bearing, crankshaft main bearing, engine main bearing, chainsaw crank bearing, crank bearing for Stihl, MS311/MS391 main bearing.
Fits Models:
MS 311, MS 391, MS311, MS391
Alternate Part Numbers:
9523-003-4304, 95230034304
Product Specifications
| L&S Part No. | 9523 003 4304 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 95230034304 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl part for MS 311 and MS 391 chainsaws - Precision-ground races ensure smooth, concentric rotation - High-grade steel construction for durability in two-stroke engines - Reduces vibration and wear on adjacent components - OEM number 9523 003 4304 for accurate fit and identification |
| Fits Models | MS311 | MS391 |
