My son in law has his late gps tractor and it had sat outside alot. We were moving equipment around with it and it lifted and held the 3pt dearborn 8'? disc and held it, but when we hooked up the 3pt dearborn 2 bottom plow it wouldn't lift it. I checked the dipstick in the rear end and it was above full and milky. I played with adjustment nut on the front of the pump to no avail. The pump looks exactly like the one in the owners manual so I assume it is the vane pump. I know I have to change the fluid but do you think thats why it won't lift the plow? Also the manual is not very user friendly on the lube chart. Is the dipstick for both the rear end and the hydraulics like the 8n. If it is for only the hyds then how do you check the rear end fluid. Thanks...Fred