CAT 320 D having problem of hydraulic operation slow after working for 10-15 mins. when the problem starts found the power shift pressure remains constant at 515 psi and no changes even change the rpm /while taking load. when the machine off and start again the problem will disappear and will comes after 10 minutes of operation. No error code appears. Engine RPM shows ok. PRV voltage is 24v. Do you think problem is in MCU?? Thanks
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