Hi all, newbie here M8200 with no oil pressure. have searched 100 pgs and used the info to diagnose my prob. tore apart tractor yest. first time taking off quick change loader.*@#*&! didnt go so well. got tractor tore down and found 4 screws missing out of the oil pump cover. didnt catch that one on forum. when i took off the inj pump cover noticed lot of little dings where it digested what I found later to be missing screws of oil pump cover. would 4 screws missing be enough to cause less than 5lb oil pressure? and I,m hoping the remnants are in the oilpan. how to get driveshaft off to get at oilpan?