Cat SX2 Differential Loosen

[aramos]

Hi,
í´m from Portugal and I have a Cat SX2.
Every time I walk the diferential loosening or starts to slip.
Previously had a Sx1 Cat and the same was not true.
Already checked the assembly with your manuel over again and everything is ok.
Can you help me in solving this problem?
I do not know what to do ....
Tank's.
Best Regards
Andrew