New here and need help. L3301 started blowing HST filter while running the bushhog. Correct me if I'm wrong. Hydraulic oil is pulled out of transmission (?) thru filter into pump. From there it goes to pressure relief valve and on to the different systems on the tractor. After going thru the radiator/cooler it comes back to the transmission (?) thru the filter on the left side. If this is correct then something is stopped up/not working after returning thru filter. I've checked relief valve and it seems to be working correctly. Oil level is right. Everything looks OK, but of course it's not. Thoughts?