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The crane transmission is a key component of construction machinery; by using a cantilevered transmission, it is possible to change the gear ratio and thus the rotation speed of the engine crankshaft, in order to meet the varying requirements for traction on the drive wheels and for vehicle speed under different driving conditions such as starting, accelerating, driving, and overcoming various road obstacles. The operating conditions for construction machinery are extremely complex and variable; such machinery is highly mobile, and the engine load changes significantly during operation, as does the speed at which the machinery moves. To ensure that construction machinery can operate efficiently while saving energy and moving quickly, it is necessary to continuously adjust its gear levels. The braking system is an important component that ensures the safe and proper operation of the crane. In lifting operations, the braking device is used to prevent the suspended items or boom from falling, as well as to stop the turntable or crane from sliding under the effect of wind forces or component forces from slopes ； Or reduce the speed of a running mechanism and bring it to a stop ； Cantilever cranes can also operate by gripping heavy objects as required for the task ； In special cases, the speed of motion is adjusted by controlling the balance between power and gravity. When the coupling sleeve is engaged with the high-speed ring gear of the auxiliary transmission, the crane’s planetary gear shaft, output shaft, inner ring gear of the planetary gears, and the input shaft gear of the auxiliary transmission are fixed together and rotate synchronously; as a result, the auxiliary transmission is shifted into high gear (direct gear), and the five gear ratios of the main transmission correspond respectively to the five smaller gear ratios of the combined transmission. Since two gear ratios are very close to each other, one of them is omitted to form a 9-speed transmission. Cantilever crane braking devices are divided into brakes and stoppers. The stopper allows the shaft to rotate freely in only one direction; it cannot absorb kinetic energy and can only keep the object stationary. Brakes should generally be installed on the working mechanisms of cranes; brakes may be omitted only in the following situations: 1. The mechanism is driven by a cylinder that moves in a straight line, and the oil circuit can be locked using a ground-based stopping mechanism. 2. The manual operating mechanism of a bridge crane, not affected by wind force or component forces from slopes.