What are the main contents of the wheel inspection when the maintenance vehicle is inspected?

The general inspection items of tire inspection include: outer edge size, tensile strength, elongation at break, tear deformation, abrasion (Akron), hardness, durability, high-speed performance, appearance quality, tire lug rubber bending test, sidewall rubber ozone aging test, tensile strength of the traveler, air tightness, tubeless tire detachment resistance, adhesive strength, sinking amount, sinking rate, grounding coefficient, static load performance, absolute value of tensile strength change rate after aging. The tire is one of the important parts of the car, which is in direct contact with the road surface, and the car suspension works together to alleviate the impact of the car when driving, and ensure that the car has good ride comfort and driving smoothness; Ensure that the wheels and the road surface have good adhesion, and improve the traction, braking and passability of the car; Bearing the weight of the car, the important role played by tires in the car is becoming more and more important.

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Check the tire wear, whether there is obvious damage to the tire surface, whether the tire pressure is normal, check the wear of the brake pads, etc.

Tire pressure, wheel hubs, tire wear, and tire dynamics

Check two places, the wheel bearing and the inner and outer ball joints of the steering machine, and knock the tire or break the wheel to check whether there is a gap in these two places. Under normal circumstances, there is no gap between the bearing and the ball head, if there is a gap, it means that the bearing or ball head is damaged and needs to be replaced. There is no specific standard for how much space must be replaced, and it is generally recommended to replace it if there is space.

If the amount of space is very small, and you don't usually drive vigorously, then you don't feel abnormal, and you can drive normally for a while. If the amount of clearance is large, it must be replaced, otherwise it will affect the driving stability. The wheels swing from side to side during driving, and it is unsafe even if the driving is not fast.

Precautions for secondary maintenance of automobiles 1: engine; Automotive Level 2 maintenance needs to check the condition of the engine at idle, medium and high speeds, as well as whether the cylinder pressure and vacuum level meet the standards. And whether the indicators of the engine after passing the three cleaning and three filtration operations meet the specifications.

The inspection of this item is more delicate than the level 1 maintenance. Precautions for secondary maintenance of automobiles 2: clutch; This project is to test the convenience, smoothness and reliability of the clutch operation, to ensure that the clutch is convenient to use, no clothing length, and there is no oil leakage in the hydraulic system.

Let the driver use the clutch better. Precautions for secondary maintenance of automobiles 3: tires; Check whether the tire pressure is normal, and whether the tire texture is mixed with impurities such as gravel that are easy to hurt the tire, and detect whether the tire is aging and bubbling.

It is also necessary to check whether the tires are rubbing against the chassis floor during normal operation. Precautions for secondary maintenance of automobiles 4: vehicle inspection; This project is to inspect the overall condition of the car, such as cracks in the frame, loose screws, lighting activation, and abnormal noises when driving.

If found, it is immediately checked, adjusted and eliminated. Make sure the vehicle is running properly. Except for Level 1 maintenance operations.

It is mainly to inspect and adjust the safety components such as steering knuckles, steering rocker arms, brake shoes, and suspensions that are easy to wear or deform after a certain period of time, and disassemble and inspect tires, carry out tire transposition, check and adjust the working conditions of the engine and exhaust pollution control devices, etc., and the maintenance company is responsible for the vehicle maintenance operations.

Outer edge size, tensile strength, elongation at break, permanent tear deformation, abrasion (Akron), hardness, durability, high-speed performance, appearance quality, lug rubber flexural resistance test, sidewall rubber ozone aging test, tensile strength of the traveler, air tightness, tubeless tire detachment resistance, adhesive strength, sinking amount, sinking rate, grounding coefficient, static load performance, absolute value of tensile strength change rate after aging.