If hard to push, only a few things to check:
(1) Rear wheels will get hair or thread wrapped around axles, dust, etc. and be hard to turn. Make sure each wheel turns easily.
(2) Small wheels on newer models (since about 1997-98) toward front are worn, missing or have same problem as item 1.
(3) Brush roll not turning. The brush roll actually helps pull this unit along the floor, as it rotates in the "forward" direction. If the belt broke, and you do not realize it, it may suddenly seem harder to push.
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