Husqvarna 545004301 Crankshaft Seal Oem

Product Description

The HUSQVARNA 545004301 is a genuine OEM crankshaft seal designed to maintain a positive oil-tight barrier at the crankshaft journal of small displacement two-stroke and four-stroke engines found in Husqvarna outdoor power equipment. The seal prevents oil migration past the crankshaft, protecting the ignition system, carburetor side, and surrounding components from contamination. Installation of the correct OEM seal is critical to maintaining proper crankcase pressure in two-stroke applications, which directly affects fuel-air mixture and combustion efficiency. This part is sourced directly from the manufacturer and meets original engineering tolerances.

This crankshaft seal is a service part suited for equipment maintenance and engine rebuild scenarios. It is commonly replaced during crankshaft service, PTO-side or flywheel-side seal replacement, or whenever oil leakage at the crankshaft is detected. Typical applications include Husqvarna chainsaws, trimmers, and similar handheld power equipment where this seal is specified by part number 545004301. Technicians performing engine teardowns should replace both crankshaft seals as a set regardless of visible wear on the second seal.

Key Features

• Genuine OEM part manufactured to original engineering tolerances
• Seals the crankshaft journal to prevent oil leakage and crankcase pressure loss
• Protects ignition and carburetor components from oil contamination
• Direct fit replacement — no modification required during installation
• Appropriate for use in two-stroke crankcase-pressure-sensitive engine applications

Compatibility

Designed as a genuine OEM-specified crankshaft seal replacement for Husqvarna power equipment where part number 545004301 is called out in the manufacturer service documentation.

Installation Notes

Crankshaft seal replacement is typically performed by a qualified small-engine technician and requires partial or full engine disassembly depending on seal location. Disable the ignition and drain all fluids before beginning any crankshaft service. Use a proper seal driver or appropriately sized socket to press the seal in squarely without distorting the lip — never drive a seal in with a hammer directly on the seal face. Inspect the crankshaft journal surface for scoring before installation, as a damaged journal will compromise the new seal.

Technical Specifications

• Part Type: Crankshaft Seal
• OEM Status: Genuine OEM Replacement

Standard Information

• Brand: HUSQVARNA
• Manufacturer Part Number: 545004301