JCB 3cx pwershift 2001?

hi ...
i have a problem in my jcb 3cx powershift 2001.the problem,
when i change from nutural to 1 0r 2.....5 forward or reward on the left inside tablo i listten a pip ((as attention))and the symbol((a gear inside it a tear of oil and a curser both sides of gear)) red lam this sound ((pip)) only one second when we shiftting from 1....5 what this mean?
only my problem with ((pip)) soundafter this no problem when jcb work. please help me if any one know and 10x
i forgot i think that the problem from filter or oil i changed all but the problem still