Overview
This aftermarket gearcase assembly is built to OEM specifications for string trimmers and brush cutters that rely on a geared lower drive. When the original gearbox develops excessive noise, heat, or lost motion, replacement is more practical than rebuilding the internal gears. This unit includes the housing, gears, and necessary bearings for a complete swap.
Key specifications
- Replacement gear head/gearbox assembly
- Includes housing, bevel gears, and bearings
- Pre-lubricated for immediate installation
- Direct-fit OEM-equivalent design
- Hardened steel gears for long service life
Compatibility
This gear assembly is designed for Homelite trimmers and brush cutters as specified above. Verify the shaft diameter, thread direction, and mounting style before ordering.
Installation notes
With the trimmer powered off, remove the bump head or blade from the lower gear housing. Unbolt and slide off the old gearbox, noting the shaft engagement. Mount the new assembly, secure it firmly, and reattach the cutting head. Spin by hand to confirm smooth engagement before starting the engine.
Common questions
Q: Will this gear housing assembly fit my Homelite UT33650B 26cc curved shaft trimmer, or is it only for the UT26CSL3VNM and UT26SSL3VNM models?
Yes, this gear housing assembly is compatible with the Homelite UT33650B 26cc curved shaft gas trimmer, and it also fits UT26CSL3VNM, UT26SSL3VNM, and UT33600B models. It is also used on the BLACK+DECKER/BLACKmax BM25SSAC 25cc curved shaft trimmer gear head setup, but it should be matched to those listed models rather than assumed to fit all 25cc trimmers.
Q: My BLACKmax BM25SSAC gear head is worn out and making grinding noises. Does this replacement come as the complete gear housing assembly, and do I need to grease it before using it?
This is a gear housing assembly, so it is intended to replace the worn gear head portion rather than individual internal gears. Before running the trimmer, it is a good idea to check that the gearbox has proper grease and add gear case grease if needed, since running it dry can quickly damage the new assembly.
Q: What should I check before installing this on a Homelite UT26SSL3VNM curved shaft trimmer?
First, confirm your exact model number from the trimmer data label and make sure the shaft style is curved, since this gear housing is for the listed curved shaft units. During installation, inspect the flex drive/cable end and the lower shaft for wear or rounding, because a damaged drive cable can keep the new gear head from turning correctly even after replacement.
