Any ideas would be appreciated. Cat tech was at a loss. Front pump loses psi(right track, boom & bucket). Rear pump works perfect(left track, stick & swing) Tech said front pump loses signal pressure. Takes 20 min to start having issues. If front pump & rear pump used together works fine. Have not heard from tech been a week.
Sounds like you have a problem in the main valve bank
Thanks for the reply I don't understand why it builds PSI to a point Like 2500 psi then drops signal pressure.