hi guys, I have a 843 with a perkins in it. my problem is that I was using out in the field and unit made a noise and bang i had no hydraulics at all. no forward reverse up , down ,tilt.. nothing. so drug unit into garage started to tear into it and found coupler between engine and motors was totally stripped out.. $600 dollars later and a few dirty words i had a new coupler in.. After a few hours of figuring out where the hoses all connected to on the oil block i was ready to start.. well i started unit and now all i have is bucket up&down , tilt up&down, and auxillary hyd. If I raise the engine rpms. I can get the unit to move sometimes. Mainly with the left side wheels. right side is very weak or non existent. It does seem as if I take and move right stick rapidly back and forth to auxillary bypass i can get the right side to charge up and move erraticly.. To me it seems like air in the system..but the bucket functions flawlessly. I did notice that the hydraulic oil seems to be frothing somewhat. Ive checked hose routing several times but the manual is pretty vauge. Do i have to pre charge hydrauilc motors? i lost about all the oil when i was doing repair.. Any help would be appreciated..I now have a $3800 boat anchor im my shop.. Thanks, Phmteck