Not sure if this will help but I had a similar steering issue on my sons Tonka Dumptruck, very hard for him to turn or make turns. I add these and it made a difference not sure what your exact issue is but can't hurt.

https://www.amazon.com/dp/B0192SOXN0/ref=cm_sw_r_cp_apa_fabc_.W43FbYABHZJW?_encoding=UTF8&psc=1