mm 30 mitsubishi

hey guys, i picked up this mini a while ago so its new to me,i was told it is the same as a cat 302.5,i replace top roll from cat and it fit great,it hard to find any info about these,now it will start and run but when you use hyd or try to move it wants to stall out,it sounds to me it could be hyd pump coupling like EK701 had,thanks Stan