Introduction
If you are having issues with overall suction from the floor brush it may be a belt issue. Overtime the belt can become loose or broken down. Often they need to be replaced after a lot of use. The belt to the Moosoo XL-618A is a small flexible band that helps spin the floor brush. It also connects the brush to the motor, which makes the brush rotate. Here is a guide to replacing it and fixing it.
Tools
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            Remove the two 9 mm screws with the Phillips #1 screwdriver and pull the plastic piece off of the motor. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.