Symptom
Cassette won't freewheel or won't stop ratcheting. Pawls stuck in resin/dried grease.
3 methods
- WD-40 bath after removing from hub, 30 min, then degreaser + light grease refill
- Hairdryer at 60-80°C if freehub won't release from hub, then WD-40
- Full disassembly with Shimano TL-FH16 tool (15-25€) — or replace freehub (30-80€)
Ask the AI mechanic — share your hub model, the AI tells you if the freehub is serviceable and which tool to use.




