The reasons why electric sweepers cannot move forward can be attributed to the following aspects:

　　1. Battery and power supply issues

　　Low battery: Electric sweeping vehicles rely on batteries for power. If the battery is fully drained or low, the vehicle will not be able to move forward. At this time, it is necessary to check the battery level and charge it in a timely manner.

　　Battery connection issue: There may be a problem with the connection between the battery and the sweeper, such as loose or damaged battery cables, which prevents the current from being transmitted. It is necessary to check the battery connection to ensure that it is tight and undamaged.

　　II. Motor and drive system issues

　　Motor failure: The motor is a crucial component that drives the sweeper forward. If the motor experiences a failure, such as damage or overheating, it will prevent the vehicle from moving forward. It is necessary to inspect the working condition of the motor and, if necessary, replace it.

　　Damage to the drive system: The drive system comprises components such as gears, chains, and bearings. If any of these components are damaged, it will affect the forward movement of the sweeper. It is necessary to inspect the wear and tear of these components and promptly replace any damaged ones.

　　III. Control system issues

　　Controller fault: The controller is responsible for receiving commands and controlling the movement of the sweeper. If the controller malfunctions, it will be unable to send correct commands to the motor, resulting in the vehicle being unable to move forward. It is necessary to check the working status of the controller and, if necessary, replace it.

　　IV. Issues with the walking mechanism

　　Wheel damage: The wheel is the part of the sweeper that comes into contact with the ground. If the wheel is damaged or severely worn, it will prevent the sweeper from moving forward. It is necessary to check the wear condition of the wheels and replace damaged wheels in a timely manner.

　　Bearing damage: If the wheel bearing is damaged, it will cause the wheel to rotate inflexibly, thereby affecting the forward movement of the street sweeper. It is necessary to check the wear condition of the bearing and replace the damaged bearing in a timely manner.

　　V. Other factors

　　Improper operation: If the operator fails to start and operate the sweeper according to the correct operating procedures, it may also result in the sweeper being unable to move forward. It is necessary to carefully read the operation manual and ensure that the correct operating procedures are followed.

　　External environmental factors: External environmental factors such as excessively wet and slippery, uneven, or obstructed floors may also affect the normal operation of the sweeping vehicle. It is necessary to choose a flat and dry floor for driving and remove any obstacles.