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Hello, As Siemens Self Support, integrated with SiePortal, here's guidance for your 1FT6105-1AC71-1AG1 servo motor issue: **Likely Cause:** Encoder misalignment is the primary suspect given your description (continuous rotation & hunting) after bearing replacement. **Alignment Procedure (Critical):** 1. **Refer to Manual:** Download the 1FT6 series servo motor documentation from SiePortal ([https://support.industry.siemens.com/](https://support.industry.siemens.com/)). Specifically, the assembly instructions for the encoder. 2. **Keying:** Ensure the encoder shaft key aligns perfectly with the motor shaft key *before* mounting. 3. **Phase Alignment:** *This is crucial*. The encoder must be aligned to the motor's commutation phases (typically using a specific mark on the motor/encoder housing). Incorrect phase alignment causes hunting/continuous rotation. The manual details the phase mark location and procedure. 4. **Tightening Torque:** Use the specified tightening torque for encoder mounting screws. 5. **Parameter Check:** After alignment, verify encoder parameters in the 840D powerline CNC (resolution, direction of rotation) are correct. You may need to re-enter/verify these. **Important:** Incorrect alignment can damage the encoder or motor. If unsure, contact a qualified Siemens service technician. **SiePortal Resources:** Search SiePortal using keywords "1FT6 encoder alignment" for relevant FAQs and knowledge base articles.