Scratch [upd] - Otis Gen2

| Step | Action | What you listen for | | :--- | :--- | :--- | | 1 | Run the car empty at contract speed. | Scratch frequency: A scratch per belt rotation indicates a localized belt defect. | | 2 | Run the car with partial load (50% capacity). | Worse with load = belt slippage or sheave groove wear. | | 3 | Visually inspect belts stopped. | Look for "shine" (polyurethane dust) or visible steel cables. | | 4 | Check the sheave grooves. | Use a flashlight. Any pitting, rust, or glazing indicates a problem. | | 5 | Measure belt tension (Otis spec: 250-350Hz). | Uneven tension causes belts to "walk" sideways, creating a scratch. |

: Unlike traditional round ropes, the Gen2 uses flat, polyurethane-coated steel belts. otis gen2 scratch