Drum/block brake clearance adjustment ensures the brake releases fully without dragging and engages quickly with predictable torque. While the exact method varies by model, the typical process involves setting equal clearance on both sides using adjustment bolts, eccentrics, or linkage settings, then verifying symmetrical contact when the brake applies. On cranes, always lock out power and secure the load before adjustment.
Too little clearance causes dragging, overheating, and rapid lining wear. Too much clearance causes delayed braking, reduced torque, and excessive actuator stroke, which can be dangerous during emergency stops. After adjustment, cycle the brake multiple times and re-check the gap because components may settle.
Also inspect mechanical joints—worn pins and bushings can make clearance “drift” quickly. For best results, document final settings and link them to your inspection schedule. A properly adjusted drum brake supports stable crane control, lower maintenance cost, and safer hoisting and travel performance.