looking for info on library bureau insulated cabinet with a yale dial and hdl to the left with # on it 7733and 38 below it any help would be appreciated

I am looking for instructions on how to change the combination on this dial.

Hello !
Im looking for a TRTL 30X6 ( THE BIGGER THE BETTER).

Thanks!
Nim. m. ohayon
Access lock & safe services ,inc.