Lifetime Warranty
[Lifetime Warranty] 99944200903 Speed-Feed 450 Trimmer Head (2026 Upgraded) - Pack of 2
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99944200903 Speed-Feed 450 Trimmer Head (2026 Upgraded) - 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.
-
FIX TRIMMER'S SYMPTOMS
Stuck/Tangled/ Broken trimmer head, The trimmer does not spin, The threads are stripping, Uneven Trimming, Excessive Vibration -
SAVING SOLUTION
Enjoy the great feeling when your trimmer is repaired and works like before - BlueStars brings DIY solutions to help you deal with any trouble -
MAINTENANCE TIPS
Regular Cleaning. Inspect the Trimmer Line & Keep surplus trimmer line around. Check the Air Filter & Fuel/Oil. Store Trimmer Appropriately -
IMPORTANT NOTE
This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility
EASY INSTALLATION
1. Bump the bottom of the trimmer head against the ground; 2. Align arrows on top of the knob with openings in eyelets; 3. Push the line an equal distance of about 5in (13 cm); 4. Turning the top disc until tight. Test running for 5 mins to ensure proper operation.
| Brand | Model Number |
|---|---|
| Replace part number | Echo string trimmer 99944200903, X047000940, Shindaiwa string trimmer 28820-08000, 78890-21001 X047000580, 55-265, 385-288 |
| Echo | SRM-266 S/N: T41913001001 - T41913999999 ; T42011001001 - T42011999999 SRM-266 S/N: T42112001001 - T42112999999; T42211001001 - T42211999999 SRM-266S S/N: T42312001001 - T42312999999; T43313001001 - T43313999999 SRM-266S (T42211001001-T42211999999) Steel Drive Shaft Trimmer SRM-266S (T42312001001-T42312999999) Steel Drive Shaft Trimmer SRM-266S (T43313001001-T43313999999) Steel Drive Shaft Trimmer |
| Echo | SRM-266U 25.4cc Straight Shaft Trimmer/Brushcutter, SRM-266U (T42712001001 - T42712999999) Straight Shaft Trimmer/Brushcutter, SRM-266U (T43513001001-T43513999999) Straight Shaft Trimmer/Brushcutter SRM-266T S/N: T42411001001-T42411999999 SRM-266T S/N: T42512001001-T42512999999, SRM-266T S/N: T43413001001 - T43413999999, SRM-266T (T42411001001-T42411999999) High Torque Trimmer, SRM-266T (T42512001001-T42512999999) High Torque Trimmer, SRM-266T (T43413001001-T43413999999) High Torque Trimmer |
| Echo | SRM-266U S/N: T42712001001 - T42712999999, SRM-266U S/N: T43513001001 - T43513999999, SRM-280 S/N: S66511001001 - S66511999999, SRM-280 S/N: S74012001001 - S74012999999, SRM-280 S/N: S81513001001 - S81513999999, SRM-280S S/N: S66611001001 - S66611999999, SRM-280S S/N: S74112001001 - S74112999999 |
| Echo | SRM-280T S/N: S66711001001 - S66711999999, SRM-280T S/N: S74212001001 - S74212999999 SRM-280T S/N: S81713001001 - S81713999999, SRM-280U S/N: S67511001001 - S67511999999, SRM-280U S/N: S75012001001 - S75012999999, SRM-280U S/N: S82513001001 - S82513999999 |