imported animation wont play when physics bodies is added to it, but plays when physics bodies are removed?

Hi
have an issue with playing animation with physics bodies added, and when removing physics bodies the animation plays normally, its a wheeled loader, i imported animations from blender, when i add physics bodies to the bucket the animation plays but the bucket stays on the ground and doesnt move with the animation, when i remove the physics bodies then it plays the animation normally, any idea what could be wrong?