Kenmore spraymate lack of suction

[2011hoover700]

Good day I have a kenmore power spray and the spraymate attachment is not got the suction I want at the rug. If anyone has any tips on restoring suction which the power spray has plenty of suction so its probably leaking somewhere in the spraymate I'd be grateful.
Thanks.

 

[vacuumkid47]

There possibly might be a crack in the head's channel or in the inlet where the extension tube connects to the head. Some cracks can be visible, but I experienced it where they are not visible to the naked eye. If that's not the case, make sure all of the tubings are clear, clean all of the filters, and make sure there is good airflow in every channel.