The tech notes indicated:
1. checked filter relief valve, surge relief cooler bypass valve, filter, suction screen all good
2. When running head popping noise all hydraulics came back, then lost pressure
3. believe issue is transmission pump or transmission pump drive
4. Replaced hydraulic valves and shifting shaft and resealed with new gaskets and o rings
5. Rolled tractor together and filled with oil, working better but not fast enough
6. Removed hydraulic pump on front and found plastic spacers in crank were gone and plugged pump
7, Rebuilt pump and put together and turned up hydraulic pressure
Labor = $4,655 @ $90/hr
Parts =$ 836
Took about two months to repair
When I got tractor home I have concerns because (1) there is a slight knocking sound not sure if its coming from the engine or the front pump, (2) the service manager told me that the engine needs to be at about 2,000 rpm to have hydraulics working well, (3) the electrical warning light is constantly on. I never had the knocking sound before. I picked up a deck mower yesterday with the three point and did need to have the rpms at about 1,800 to pick it up, never had to do this before and the electrical warning light never turned off. Very very disappointed in JD service