Overload
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| Application | Extended pin fitted to chain to carry an outboard roller. |
| Failure mode | Sudden shock overload has caused the pin to fail. |
| Diagnosis | The extended pin has failed due to overload or shock loading. The failure has initiated at the corner of the flat on the pin. The "river markings" flowing away from the crack initial point can be clearly seen. |
| Solution | Determine the reason for the shock / overload and either remove the cause or re-design the pin to carry the load. |