Diagnosis and Treatment of Common Diseases of Tractor Brake
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One, Brake Failure
If the friction plate is severely worn or has become too thin, it can increase the brake clearance and reduce braking efficiency. To address this, adjust the thickness of the adjustment gasket on the brake cover to ensure it meets the required clearance specifications. If mud or oil gets inside the brake assembly, it can lower the friction coefficient and cause braking issues. In such cases, replace the oil seal and rubber seal, clean all brake components with gasoline, and allow them to dry before reassembling and using the system.
If the brake fails due to a faulty return spring or a jammed steel ball, disassemble the brake mechanism and inspect the components. Replace the damaged return spring, and use fine emery cloth to polish the brake platen groove and steel ball. After cleaning the surfaces thoroughly, reinstall the parts properly.
Additionally, if the free travel of the brake pedal is too large, it may lead to improper braking or failure. Release the interlocking piece of the brake pedal and adjust the free travel on both the left and right pedals according to the manufacturer's specifications. Once adjusted, reinstall and test the system.
Second, Brake Overheating
If the brake pedal clearance is too small, the tractor might experience unintended braking while in motion, which can cause excessive heat buildup. Adjust the free travel of the brake pedal so that both the left and right pedals have a clearance of 90–120 mm.
If the splined hole and spline shaft are too tight, causing the friction plate to drag and generate heat, repair the splines to ensure the friction plate moves freely along the shaft.
If the pressure plate return spring is faulty and prevents the pressure plate from returning to its original position, the brake may remain partially engaged, leading to overheating. Replace the faulty return spring.
If a steel ball becomes stuck in the groove, causing the brake to overheat, clean the ball and groove with gasoline, then use fine emery cloth to smooth both surfaces. Apply a small amount of grease to the groove before reassembling and using the brake again.
Third, Tractor Drifting
If the left and right brake pedals do not have equal free travel, readjust them so that both sides operate consistently. If one side of the brake slips, identify the cause—this could be due to dirt, worn seals, or misalignment. Clean the internal components, replace any damaged oil seals or rubber seals, and reassemble the brake for reuse.
If the tractor drifts due to uneven braking during field operations, it may indicate severe wear on the friction linings on one side. In such cases, replace the worn friction linings to restore proper braking performance and prevent further drifting.