The easiest way to see if the PTO/hydraulic pump drive shaft is to pressurize the PTO clutches. This will lock up the clutches. If the PTO shaft turns, something in the shaft/shafts going to the flywheel is broke. There are 3 lines on the pto. Standing at the rear of the tractor, pressurize the hole to the right of the 3rd link. Just use a rubber tip blow gun. The top hole is for PTO brake, and the one on the left is for PTO lube. This is the way we determined where the issue was on our 2-155. There are 3 shafts from the flywheel coupled together. It has splines in the flywheel hub, then goes to short shaft. Then it couples to another shaft at the rear of the over/under. Then that shaft couples inside the hydraulic pump drive gear with the shaft from the PTO. Most likely the dry splines in the flywheel is what is worn out. You have no choice but to pull the engine if that is the case. There is charge pump behind the hydraulic pump to feed the filter then the pump. I assume you have no charge pressure either. There is a sensor right below the cab door that you could pull out. As mentioned before, a suction line to the charge pump or from may have come loose. I can't remember, exactly, but there is at least 1 line that bolts to the inside of the transmission case behind the hydraulic filter. Ours, the one bolt was loose on when I had it apart, but could have become an issue. One other thing I learned is that the keyway for the gerotor charge pump wears in the shaft and can eventually shear off when it gets too thin. You'll have to remove the hydraulic pump to check this. White did an update to this for that issue. The suction tube to the charge pump can be accessed by removing the big plug under the trans housing on the left. You will need to drain the rear before removing. The other end of the suction tube is behind the hydaulic pump. Let us know what you find. If you have any questions, email me. Hope this isn't overwhelming. I do have a factory manual if you need pics or something.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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