First, check whether the brake mechanism can be effectively opened when the service brake of 10T double-beam crane is started. If it is normal, check whether the series resistance of the crane running motor is short-circuited. If there is a short circuit, the running motors of the crane are connected in series, so it is difficult to start at a low level, so it can only be started at a high level. In the long run, the motor will continue to heat up, causing the motor to burn out. Wei Hua hoisting, hope to adopt!