Overview
A failing gear head announces itself with excess vibration, grease leaks, and rough operation. This replacement gear head and blade is machined to OEM dimensions and arrives pre-greased, ready to bolt onto your trimmer shaft. A cutting blade is included, making this a complete kit for brush-clearing tasks. It is a straightforward fix that restores smooth, quiet cutting.
Key specifications
- Type: aftermarket replacement gear head
- Pre-greased: yes
- Material: die-cast aluminum housing with steel gears
- Includes: brush-cutting blade
Compatibility
This gear head fits Echo SRM-225 SRM-225i SRM-2620 SRM-3020 SRM-266 SRM-280 and similar models that share the same shaft interface. Always verify your trimmer’s model and part number against the full compatibility list to make sure the housing mount and drive splines align.
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 kit fit my Echo SRM-225i, and does it also work on the regular SRM-225?
Yes, this heavy-duty replacement kit is made for both the Echo SRM-225i and the standard SRM-225, along with the SRM-2620, SRM-3020, SRM-266, and SRM-280. Before installing, it’s still smart to compare your original gear head part numbers P021008182 or P021046670 and confirm your shaft and tube setup match your existing unit.
Q: Does the included 7” chainsaw tooth brush cutter blade work well for thick weeds and small saplings on an SRM-3020?
Yes, the 7-inch chainsaw tooth blade is intended for heavier brush work than standard trimmer line, so it’s a good choice for thick weeds, vines, and light woody growth on an SRM-3020. It’s best used with the proper guard and hardware installed, and you should avoid rocks or fencing since that can dull or damage the teeth quickly.
Q: What should I check during installation and maintenance of this replacement gear head on an Echo SRM-266?
When installing it on an SRM-266, make sure the gear head seats fully on the drive shaft and that all mounting hardware is tightened to the same alignment as the original unit. For maintenance, keep the gearbox properly greased, inspect the blade and fasteners before each use, and check for vibration after installation since that usually points to loose hardware or an improperly seated blade.
