Description
Overview:
This is a Genuine Husqvarna crankshaft sealing (544 25 12-01 / 544251201) for petrol chainsaws. It is a metal-cased, oil‐resistant elastomer radial shaft seal designed to control crankcase pressure and stop oil or fuel mist escaping around the crankshaft. By maintaining an airtight seal between the crankshaft and crankcase, it helps prevent air leaks that lead to lean running, poor acceleration, or hard starting. Built for the heat, vibration and contamination found in chainsaw use, it supports stable idle and consistent performance over time. Sized to the original housing and shaft, it provides a precise interference fit and a controlled lip preload, typically aided by an internal spring. Suitable for Husqvarna models including the 135 and 140 series, plus the 435 and 440 ranges.
Key Features:
- Genuine Husqvarna part for correct fit and reliable sealing
- Metal-cased, oil-resistant elastomer construction for durability in harsh conditions
- Helps prevent air leaks that can cause lean running and loss of power
- Reduces oil seepage to keep the engine and clutch area cleaner
- Supports smooth starting, stable idle and consistent carburettor tuning
- Designed for the OEM crankcase bore and crankshaft diameter for a secure fit
- Suitable for routine servicing or full engine rebuilds
- Resistant to heat, fuel and chain oil exposure common in chainsaw operation
- Straightforward to install with appropriate pressing tools; no modifications required
Typical Applications:
Used when servicing or rebuilding Husqvarna chainsaws to restore crankcase sealing, especially where there are symptoms such as erratic idle, rising revs, or oil residue near the crankshaft. Common during bearing replacement, after high hours, or when diagnosing vacuum/pressure test failures. Helps maintain engine efficiency and prolongs service life in regular domestic, arborist, and light professional use.
Also known as:
Crank seal, engine seal, oil seal, crankcase seal, radial shaft seal, crankshaft oil seal, primary shaft seal.
Fits Models:
135, 135E, 140, 140E, 435, 435E, 435EII, 435II, 440, 440E, 440EII, 440II
Alternate Part Numbers:
544 25 12-01, 544251201
Product Specifications
| L&S Part No. | 544 25 12 01 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Husqvarna |
| OEM No. | 544251201 |
| Unit of Sale | 1 |
| Applications | 135, 135E, 140, 140E, 435, 435E, 435EII, 435II, 440, 440E, 440EII, 440II |
| Machine Type | Chainsaws |
| Fits Models | 135 | 135E | 140E | 435 | 435E | 435EII | 435II | 440E | 440EII | 440II |
