4.Cleaning.
Before you install any hydraulic parts, make sure to clean them with kerosene or diesel and wipe them dry. If you've test-fitted the metal pipes, take them off and clean off any rust with acid, neutralize them with an alkaline wash, then rinse with water. After that, dry them and oil them up before you go ahead with the actual installation.
After you set up the system, clean it well before testing. Fill the oil tank with 60% to 70% working oil and put a temporary filter on the return line. Then, disconnect the hoses from the actuators and connect them with temporary pipes.
