Inspection of the cause of mechanical failure of the brake drum

First of all, the brake drum with the hot phenomenon is supported by a jack, the air pressure is charged to more than 8 kg, step on the brake, and then release the brake. If the brake adjustment arm of the brake drum cannot return to position in time, it can be judged that it is the cause of mechanical failure; then check the return of the brake adjustment arm by pulling the handbrake and letting go of the handbrake.The following factors can cause the brake adjustment arm to not return to position or slow return to position：

1. Camshaft bending or camshaft bracket deformation；

2. The two ends of the camshaft bracket have not been lubricated for a long time, causing rust, stagnation, and difficulty in rotation.；

3. The return spring of the brake shoe is broken, or it loses elasticity after high temperature.；

4. The axle shaft tube is bent, which makes it difficult for the camshaft to rotate.；

5. The deformation of the brake shoe bracket causes it to not return to position, or the shoe is always in contact with the brake drum.；

6. After replacing the brake shoes, improper adjustment of the brake gap will also cause the brake drum to heat up.For example, for a two-axle car, the brake clearance of three brake drums is adjusted just right, but the brake clearance of one brake drum is too small, then during driving, the brake drum with a small brake clearance may have a high temperature; another example is that the bearing clearance is too small, then the hot part should be on the hub.

In short, the brake drum is hot due to mechanical failure, and it is relatively easy to check the cause of the failure. As long as it is checked and verified step by step, the cause of the failure and the solution can be found.

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