99944200903 Speed-Feed 450 Trimmer Head - Pack of 2
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99944200903 Speed-Feed 450 Trimmer Head - Pack of 2
Key Features
- Quantity: 2 trimmer heads
- Type: Bump-feed, fast-reloading head
- Diameter: 4.5 inches
- Line Capacity: Holds up to 20 ft of 0.095-inch trimmer line
- Arbor Size: 10mm x 1.25mm Left-Hand Thread (LH)
Replaces / Cross-Reference Part Numbers
- Echo: 99944200903, X047000940
- Shindaiwa: 28820-08000, 78890-21001
Compatibility & Fitment
- Designed for Echo and Shindaiwa straight shaft trimmers.
- Fits Echo models including: SRM-225, SRM-266, SRM-266S, SRM-266T, and SRM-266U.
- Verify your equipment requires a 10mm x 1.25mm LH arbor before purchasing.
When to Replace
- Housing is cracked, broken, or exhibits excessive wear.
- Bump knob is worn through, preventing line feed.
- Line consistently fails to advance or jams inside the head.
- Head causes excessive vibration or wobbles during operation.
Installation Tips
- Turn off the engine and disconnect the spark plug for safety.
- Lock the trimmer's gearbox to prevent rotation while removing the old head.
- Clean any debris from the arbor threads before installation.
- Thread the new head on counter-clockwise until firmly seated.