JD 490 Excessive Hydraulic Temperature

I have a 409E with about 8,000 hours which suddenly went slow in all modes. The problem was no more than 2,000 PSI from main pump. Removed main pump for internal inspection by hydraulics shop, no issue found. During 4 months of searching, Replaced:

1. Main Pump solenoids.
2. Angle sensor
3. DP Sensor
4. Fuel filter
5. Cleaned hydraulic filters, air filters
6. Replaced PVC
7. Cleaned all connections
8. Service Tech finally showed up and found a broken spring in one of the main pump...

JD 490 Excessive Hydraulic Temperature

JD 490 Excessive Hydraulic Temperature