What are the links and levers of the windscreen wiper linkage?
These are parts that ensure the wiper blades move according to a required pattern. The links are interconnected by hinges and levers. The wiper arms with the blades are attached to them. When the actuator is switched on, the rotation of the electric motor is converted into reciprocating motion of the links. This drives the wiper arm pivot shafts and, accordingly, the wiper arms.
What are the signs of faulty links and levers of the windscreen wiper linkage?
Signs these components are defective include the wiper blades moving slowly or unevenly regardless of the operation mode, stopping spontaneously, and producing abnormal sounds during operation. The windscreen cleaning may be impaired. When you turn on the wipers, their arms remain stationary or fail to return to their original position when switched off.
What can cause failure of the links and levers of the windscreen wiper linkage?
The design of the wiper linkage has many moving parts which can be adversely affected by moisture, dirt, and lack of lubrication. These factors lead to corrosion and jamming of individual elements, and rapid abrasive wear which results in abnormal play. Sometimes an incorrectly adjusted linkage causes the wipers to malfunction. Damage to the links and levers can also be the result of switching on the wipers in sub-zero temperatures when the blades are frozen to the windscreen.