Overview
The gear head is the business end of your trimmer, and when it goes bad the whole tool becomes useless. This gear head provides a factory-spec replacement at a fraction of dealer cost. It ships pre-packed with lubricant so you can install and go.
Key specifications
- Type: aftermarket replacement gear head
- Pre-greased: yes
- Material: die-cast aluminum housing with steel gears
Compatibility
Compatible with Echo SRM-225 SRM-225i SRM-2620 SRM-3020 SRM-225U SRM-266U SRM-280U and other trimmers sharing identical drive-shaft geometry. Cross-reference the OEM part number listed in your owner’s manual with the compatibility table to confirm this gear head will work on your machine.
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 P021046670 gear head fit my Echo SRM-225, or is it only for the later SRM-2620 and SRM-3020 models?
Yes, this gear head is made to fit the Echo models listed here, including SRM-225, SRM-225i, SRM-2620, SRM-3020, SRM-225U, SRM-266U, and SRM-280U. It is used as a replacement for part number P021008182, so the safest check is to match your original gear head or parts diagram to that number before installing.
Q: I have an Echo SRM-266U brushcutter. Does this replacement come as the complete gear head housing, and can I reuse my existing blade or trimmer attachment?
This replacement is for the gear head assembly itself, so in most cases you will transfer over your existing cutting attachment hardware if it is still in good condition. As long as your SRM-266U uses the matching P021008182-style gear head setup, your original blade or trimmer head should reinstall normally with the correct mounting parts.
Q: What maintenance should I do after installing this gear head on my SRM-225U or SRM-280U?
After installation, make sure the gear head is aligned properly on the shaft, all fasteners are tightened to spec, and the cutting head spins smoothly without wobble. It is also a good idea to keep the gearbox properly greased at the recommended service intervals, because low grease is one of the main causes of premature gear head wear.
