Description
99944200903 Speed-Feed 450 Trimmer Head
Key Features
- Features a rapid-loading system for trimmer line refills.
- Bump-feed mechanism advances line with a simple tap on the ground.
- Holds up to 20 ft. of 0.095 in. diameter trimmer line.
- Constructed with a durable, high-impact housing.
Replaces / Cross-Reference Part Numbers
- Direct OEM replacement for part number 99944200903.
Compatibility & Fitment
- Fits various ECHO straight-shaft grass trimmers and brushcutters.
- Commonly used on models such as the ECHO SRM266.
- Requires a 10 mm x 1.25 mm left-hand (LH) threaded arbor for installation.
When to Replace
- The outer housing is cracked, broken, or excessively worn.
- The bump knob fails to advance the trimmer line upon tapping.
- Internal components are worn and can no longer grip or feed the line properly.
- Line eyelets are damaged, causing the line to fray or break frequently.
Installation Tips
- Disconnect the spark plug before beginning installation for safety.
- Lock the gearbox to prevent the head from rotating during removal.
- Unscrew the old head by turning it clockwise (it is reverse-threaded).
- Secure the new head by threading it on counter-clockwise until snug.
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