1, this situation generally appears in vehicles with mechanical and hydraulic power steering, which is a very common steering power-assisted way in the past, abbreviated as HPS in English, with mature and reliable technology and low cost. This steering assist mode converts part of the engine's power output into hydraulic pump pressure, and applies auxiliary force to the steering system, thus steering the tires. When the steering wheel is not turned, the pressures in the chambers on both sides of the piston are consistent and in a balanced state. When the steering wheel rotates, the mechanical control valve connected to the steering column will be opened or closed accordingly, and the oil on one side will directly flow back to the oil storage tank without passing through the hydraulic cylinder, and the oil on the other side will continue to be injected into the hydraulic cylinder, resulting in the pressure difference between the two sides of the piston, which will be pushed under the action of hydraulic pressure, thus generating auxiliary force. At this time, we will feel that turning the steering wheel is not so laborious.

2. The steering pump drives the belt to slip. The steering pump is driven by a belt. If the friction between the belt and the pulley is too small, the belt will slip on the pulley, and then it will make a squeaking sound. The possible reasons are that the belt adjustment is too loose, the pulley groove is too worn, or the new belt is not well matched with the old pulley. It can be judged by a simple method. When there is noise, pour some water on the belt. If the noise disappears, the belt is slipping. At this point, first adjust the tension of the belt. If it still rings after adjustment, it can take a period of time for the belt and pulley to fully cooperate, and then see if it still rings. If it still rings, replace the pulley.

What if the steering wheel is abnormal?

1, the sound of the rebound clip behind the turn signal

2, the direction column dust cover noise

No matter where and when you drive, you will hear the sound coming from under the steering wheel, so check the steering column dust cover. Once the steering column dust cover lacks lubrication, it will produce the sound of dry friction. As long as you put some butter on the dust cover, this sound will disappear.