Cat 988b tranfer gear oil leak please help

Hi guys im new here i want thank for accept me in this forum, now i explain my problem.

i have a 988b and have a very strong oil leak in front of transmission, (under cabin) y already changed more times than i can remember brake acumulator, it fix the problem for few days but later again i have the leak, now i changed again the acumulator, and leak is now behind the round cover used to be, i changed again acumulator and same problem what else i can do my brain doesnt work anymore please i aprecciate your help