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
Compatible with Stihl FS94C-E FS120R FS120 FS130 FS130R FS200 FS240CE 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 gear head fit my Stihl FS94C-E or is it only for the larger FS120/FS130/FS250 models?
Yes, this replacement gear head is listed to fit the Stihl FS94C-E as well as FS120R, FS120, FS130, FS130R, FS200, FS240CE, FS250, FR85, FR85T, and FR130T models. It is intended as a replacement for part number 4137 640 0100, so the best way to confirm fitment is to match your original part number and compare the mounting style on your machine.
Q: I’m replacing the gear head on my FS130R—do I need to add grease before using it, and how often should it be maintained?
Yes, it’s a good idea to check the gearbox grease before first use and add the correct gear grease if needed rather than assuming it is fully packed. For normal use, inspect and regrease it periodically, especially if the trimmer runs hot, gets noisy at the head, or is used heavily for brush cutting.
Q: My FR130T brushcutter has a worn-out head with vibration and noise—will replacing the gear head solve that, and is installation straightforward?
If the gears or bearings in the original head are worn, replacing the gear head often fixes grinding noise, excess vibration, and poor blade or trimmer head rotation. Installation is usually straightforward for someone familiar with Stihl brushcutter service: remove the cutting attachment, take off the old gear head, transfer any needed hardware, and make sure the new unit is aligned and secured properly before operation.
