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How does electro-hydraulic thruster oil leakage or low oil level affect crane brake performance?
On overhead and gantry cranes, electro-hydraulic thrusters are often used to release drum (block) brakes against spring force. If the thruster leaks …
Read moreWhat risks occur if an electro-hydraulic thruster stroke is insufficient?
Insufficient thruster stroke means the brake may not fully release, partially release, or fail to achieve the intended clearance. The most immediate …
Read moreIf the brake releases slowly, is it an actuator problem or mechanical binding?
It can be either, and the fastest way to diagnose is to separate “power delivery” from “mechanical movement.” First, verify the actuator’s input: …
Read moreWhat are symptoms of a brake not fully releasing (dragging) on cranes?
A dragging brake creates continuous friction during motion, causing heat and rapid wear. Typical symptoms include unusually hot brake housings or …
Read moreWhat are common causes of load slipping (“creep”) after the hoist brake applies?
Load slipping after brake application indicates insufficient holding torque or unstable friction. Common causes include worn or glazed linings, …
Read moreHow should “zero-speed brake set” be configured on a VFD hoist to prevent load drift?
To prevent load drift (creep) on a VFD-controlled hoist, the brake must set only when the motor is truly producing zero speed and sufficient holding …
Read moreIf a crane uses a VFD, why is a mechanical brake still required?
A VFD can provide controlled deceleration and even regenerative braking, but it cannot replace the safety function of a mechanical brake. In hoisting, …
Read moreWhy do some cranes require dual brakes on the hoisting mechanism?
Dual brakes (redundant braking) are used when the risk level is high and a single brake is not considered sufficient for safety. On many …
Read moreHow do I select a crane brake using motor power, speed, and gear ratio?
Motor power and speed are useful starting points, but you must translate them into torque at the brake location. First compute motor torque from power …
Read moreIs the safety factor for travel brakes the same as for hoist brakes?
Usually not. Hoist brakes face gravity-driven risk and must prevent load drop, so their safety requirements are typically stricter. Travel brakes …
Read moreWhat safety factor should be used when selecting a crane hoist brake?
Safety factor is the margin between the brake’s rated torque and the maximum torque your hoist may demand in real conditions. For overhead and gantry …
Read moreHow do I calculate required hoist brake torque for an overhead/gantry crane?
Hoist brake torque must be sufficient to safely hold the maximum load and handle the worst-case stopping scenario. Start by determining the load …
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