English 
how to recalibrate speedometer
During the calibration test of the speedometer, first let the instrument rotate freely, then put it on the test bench, run at different speeds, and compare the readings of the standard pointer on the speedometer and the test bench. Operate the speedometer on the test bench and pay attention to the noise. The noise shall be lower than the required standard.
The test time should be to run the speedometer to record a number of miles. Except for a few rotating digital wheels, all digital wheels shall be arranged evenly. A simpler method is to stop when the pointer is above zero to see if it is aligned. If there is too much grease on the meter, wipe it clean. The flexible shaft and cover should also be cleaned. Some speedometers have lubricating felt or felt line on the axle. Modern speedometers generally do not need lubrication.When lubricating the flexible shaft of the speedometer, just add a little special lubricating oil. Too much oil will flow from the flexible shaft to the head of the speedometer. The accuracy of speedometer the accuracy of speedometer and odometer is related to tire size, rear axle pinion ratio and the gear driving the speedometer. Changing the size of tires and adopting different rear axle speed ratios will change the accuracy of speedometer and odometer. In order to ensure high accuracy, automobile manufacturers have equipped speedometers with drive gears of different specifications.
The adjustment method of speedometer varies according to different models. It is recommended to go to the 4S store for professionals to operate. The speedometer is used to check the driving speed of the vehicle. It supports two units: mile per hour or kilometer per hour. The speed measurement is realized through the speed sensor. The driving speed of the vehicle is closely related to the radius of the wheel and the rotating shaft structure. There are two main reasons why the speed displayed by the automobile speedometer is larger than the actual speed: for safety reasons and errors in the calculation process. China's roads have the highest speed limit, which is specified according to the number of accidents and road conditions. In order to avoid speeding and prevent car owners from overtaking. In addition, the speed measuring device on the vehicle may have delay. In order to avoid excessive instantaneous speed, when the displayed value is greater than the actual value, it can prevent the danger caused by sudden acceleration of the vehicle.
Get a Quote / Info