Humanoid animation issue

Hi, I have a problem with my Humanoid character which was modeled and rigged in Maya. The animations created in Maya are not working propely when imported to Unity. However they works fine in legacy and generic animation types. The animations which I downloaded from asset store are working properly in my character in Humanoid animation type. When I replaced my character's avatar with the "dude avatar" (default character avatar in unity), all animations we done in maya works fine. But after that the animations downloaded from asset store doesnt seems to work with dude avatar. I tried my animations with other humanoid characters downloaded from asset store, still the same problem exists. Please help.