Ok ill try to help Hydraulic system pump valve cylinders flow back to tank. Try one cylinder first to see what's. NOt doing its job. Test pump psi because contamination can heat the pump weaken if psi is good the lines connect by the manual the valve is a switch gate like train station Don't guess alot people can help even the dealer but ask for technical department not service you will be. Charged.check vale in the wrong way is a headache grab a hydraulic schematic your on your way good ??