How can I set up hector navigation on my custom Robot?

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Hi, I'm the new user of ROS. I've use using 'hector slam' open source from hector team. I could make cost map with using Lidar and when I set a goal point, the path is created. I have a prototype robot which is small and when I applied hector navigation code to my robot, it worked well. My final purpose is apply the hector navigation code to my big robot. But when I used hector navigation code, the robot size could not be reflected in the path. So that, the robot crash the obstacle all the time. I checked the configure file and set the robot footprint variable properly, but the path was still same. How can I apply hector navigation code to my big custom robot properly?