Your height setting may be incorrect. Adjust the height setting to the type of surface you’re cleaning. Use a higher setting for carpets and a lower setting for bare floors. You can adjust the setting using the dial on the base of the vacuum.
If your vacuum is still difficult to push, please take your it to a technician. You can find your nearest BISSELL® Authorized Service Center by clicking http://www.bissell.com/support/product-support/service-centers/ or by calling 1-800-237-7691, available 24 hours a day.