Tractor during running transportation. Especially when driving on bumpy roads, although the brake pedal is not stepped on, the trailer wheels suddenly get stuck and there is a long-distance tire drag on the road surface; or when the brake pedal is pressed to stop, when the system is released When the pedal is pressed and you want to continue driving, the wheels do not turn. This phenomenon is called the wheel "a daze." First, the cause of the wheel "dawn" is mainly due to: 1. As the trailer's brake pin shaft and the brake shoe pin shaft hole between the serious wear, the gap becomes larger, the brake shoe positioning in the brake drum instability, when When the car bumps violently, the friction pad on the brake shoe partially comes into contact with the brake shoe. The resulting frictional resistance causes the wheel to "stare." 2. The lack of strength of the return spring of the moving hoof is insufficient. When the seesaw is released, after the brake cam is returned, the friction plate is still in the braking position, and the tire is in a braking state, resulting in a “dawn†of the wheel. 3. When installing and adjusting the friction plate, the clearance between the friction plate and the brake drum is too small or there is no clearance, and the wheels are in a semi-brake state. Wheels will also produce "a daze." Second, the wheel's "daze" exclusion 1. In the transport operation, the wheel appears "a daze", you can stop the car, step on a few brake pedals, or knock the brake drum. Loosen the car backwards. The dice may turn. 2. If it is due to insufficient elasticity of the return spring, the axle will become "a daze." Replace the return spring and the bearing. 3. If the brake pin shaft and the pin hole are worn out, replace the parts, or add a bushing after rounding the worn shaft and hole. In addition, the gap between the friction plate and the brake drum should be adjusted to normal. The tightness of the nut outside the bearing should be tightened in the end to allow the bearing to have no clearance, but it can be rotated flexibly.
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