The belt for the Bissell 6594 is part number 203-1093 if you purchase the belt directly from Bissell. The belt is also available at general merchandise stores that sell the Bissell vacuums, because it fits six styles of Bissell’s variety of vacuum cleaners. When looking at the package, it will refer to the style number of the vacuum, which is related to its filtration system. The Bissell 6594 is style 10.
The cost of the replacement belt varies, but generally is under $5 for the package of two belts. Bissell suggests purchasing genuine Bissell parts and accessories to ensure your vacuum runs at its best. Retailers of the parts and vacuums vary based on geographical areas.
Replace the belt by disassembling the brush cover under the unit. Ensure the vacuum is unplugged when you replace it. The belt attaches to the floor brush and motor pulley, and requires stretching the floor brush from the pulley to ensure the floor brush is securely in place. After replacing the belt and reassembling the brush cover, turn on the vacuum and use it on an area of carpet to ensure it is working properly.
Although the belt may require replacing it from general use of the vacuum, performing routine maintenance will extend the life of it and its parts. Remove debris from the rotating brush that can affect the belt and the rotating brush’s ability to spin properly, which often results in the belt breaking or sliding. Replace and clean other parts such as filters and canisters routinely.