Dieseldirt - 6/19/2018 14:45

Hi, I'm trying to figure out a hydraulic problem on a John Deere 4630 tractor powershift. With about 10000 hrs.
I have low transmission lube pressure. At 2000rpm and 100 degree oil. 20 psi.
Clutch psi is 170
It takes about 30 seconds for oil to come to after starting tractor.
Psi is ok with cold oil but slowly gets worse as it warms up. With warm oil I have to keep rpms up or else I will loose all hydraulics, no clutch, no shifting, no brakes, no steering.
I have replaced filters and suction screen. With no obvious issues.
I have destroked main pump and lube psi is still low.
I have looked in plug hole at rear of transmission no oil is spraying around in there except a small drip every second towards the right edge of the hole. Seems to be normal.
Pto engagement and shifting through all gears , brakes, and diff lock, and clutch does no change to lube psi.
I am wondering were this oil is going. Or were possible pressure could be going.
If I press clutch pedal should there be or not be, any lube psi change.
Thanks for your time and advice.