What are the symptoms of a faulty plain bearing?

[BryceDella]

Here are the symptoms of a faulty plain bearing: 1. When turning the steering wheel while stationary or at low speeds, a "squeak... squeak" sound may be heard, and in severe cases, vibration in the steering wheel can be felt. 2. When driving on bumpy roads or over speed bumps, a "thud... thud" sound may be heard. 3. Tire noise becomes noticeably louder during driving, and in severe cases, a "hum... hum" sound may be present. 4. The vehicle may pull to one side. Here is a detailed introduction to plain bearings: 1. Plain bearings use high-precision cylindrical rollers (needle rollers) to increase contact length, allowing these bearings to achieve high load capacity and stiffness in a very compact space. 2. DF plain needle roller bearings and plain cylindrical roller bearings feature profiled surfaces on their needle rollers and cylindrical rollers, which reduce edge stress and improve service life.