Overview
Replace your trimmer’s worn gearbox with this aftermarket gear head to eliminate wobble and restore efficient power transfer to the cutting attachment. Manufactured to match factory tolerances, it drops right onto the drive shaft without modifications.
Key specifications
- Type: aftermarket replacement gear head
- Pre-greased: yes
- Material: die-cast aluminum housing with steel gears
Compatibility
Engineered for Echo SRM-225 SRM-225i SRM-2620 SRM-3020 SRM-225U SRM-266U SRM-280U trimmers and brushcutters with the same shaft diameter and spline count. Confirm your model number against the compatibility listing before ordering, as gear-head bolt patterns can differ across production runs.
Installation notes
Remove the cutting attachment and unbolt the old gear head from the shaft tube. Inspect the drive shaft splines for damage before installing the new head. Slide the replacement onto the shaft, ensuring the splines engage fully, and secure the clamp bolts. Mount your preferred cutting attachment, start the trimmer at low RPM, and check for unusual vibration or noise.
Common questions
Q: Will this gear head fit my Echo SRM-225 or SRM-225i straight shaft trimmer, and does it replace part number P021008182?
Yes, this gear head replacement is made for the Echo SRM-225, SRM-225i, SRM-2620, SRM-3020, SRM-225U, SRM-266U, and SRM-280U, and it matches replacement part number P021008182. If your machine is one of those listed models and uses that part number, it should be the correct fit for the lower gear head assembly.
Q: I have an Echo SRM-266U brushcutter—can I use this gear head with both a trimmer head and a brush blade?
On the SRM-266U, this type of gear head is intended for the brushcutter setup, but you should confirm your guard, flange, and mounting hardware match your current configuration before switching between a line head and blade. The safest approach is to compare your original gear head and hardware layout to ensure the output shaft and attachment setup are the same.
Q: What maintenance should I do after installing this gear head on an Echo SRM-3020 or SRM-280U?
After installation, make sure the gear head is fully seated on the shaft, the mounting fasteners are tightened evenly, and the head spins smoothly without wobble. It’s also good practice to grease the gear head at the recommended service intervals and check for heat, noise, or leaking grease after the first few uses.
