Otis Gen2 Scratch May 2026

Do not guess. Use this systematic approach to diagnose the Otis Gen2 scratch.

| 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. |

Critical note: If the scratch is accompanied by a rhythmic thump or vibration, stop the elevator immediately. That indicates broken steel tension members inside the belt—a safety risk. otis gen2 scratch

Before you can clear the noise, you must identify the root cause. Below are the top five reasons for a mechanical scratch in the Otis Gen2 platform.

The sheave itself is not immune. Years of friction wear the grooves into a non-standard profile. Instead of a clean "U" or flat-bottom groove, the groove develops a "crown" or a rough, pitted surface. When a new belt rides on an old, scratched sheave, the sound returns almost immediately. Do not guess

If the brake rotor is scratched but not warped:

The Gen2 machine room-less (MRL) system relies on a steel belt coated in polyurethane. Over time, friction can create "scratching" – a symptom that may indicate: Left unaddressed, scratches can lead to belt failure,

Left unaddressed, scratches can lead to belt failure, uneven leveling, or controller faults (e.g., 2700 series encoder errors).