HYDRAULIC TROUBLESHOOTING 2023

air Ingested________________ is a common cause of erratic actuator movement. slow Reduced flow due to a worn pump can result in ______________________ actuator speed. fixed-gear A fault in a relief valve when used with a(n) ______________________ pump can create a fast actuator speed fault. misadjustment A major cause of incorrect deceleration is ______________________ of the components used to control the actuator. case drain A worn motor that is causing a slow actuator speed fault will have increased______________________ flow. decelerate A cylinder cushion is used to ______________________ the cylinder rod. control The ______________________ portion of the hydraulic circuit is the most common cause of a machine sequence fault in which the actuator will not move. sequence An actuator that moves out of ______________________ is most often caused by a faulty sensor or the PLC. relief A(n) ______________________ valve malfunction or a failure of the DCV to shift are possible causes of a pressure change fault. Speed ______________________ change problems are a result of either the flow being incorrect or the flow not changing. DCV Most multiple pressure circuits use a(n) ______________________ to vent the remote port of a relief valve. indicators If an actuator moves out of sequence, compare the sequence of the PLC's ______________________ to the program sequence. zero A(n) ______________________ system pressure fault occurs when a component fails in such ways that flow from the pump stops or resistance to the flow stops. low A(n) ______________________ system pressure fault occurs when a component fails in such ways that flow to the system is reduced or fluid is being leaked to the reservoir. high An increase in flow to the system can create a(n) ______________________ system pressure fault. heater The ______________________ on a hydraulic system should be turned off in the summer to avoid overheating the hydraulic fluid. vibration Hydraulic piping must be adequately supported to avoid ______________________. sequence An actuator that does not move indicates a machine ______________________ related fault. symptom and cause The ______________________ method of troubleshooting tests the components that are known to cause the symptoms observed. causes A flowchart typically guides the troubleshooter through a list of ______________________ for each symptom. decision, A branching, or ______________________, element is represented by a diamond and asks a question to the troubleshooter. logical Flowcharts provide a(n) ______________________ path to follow. PLC If the PLC's output indicator is on, but the output device does not function, the problem is in the output device or the wires between the output device and the ______________________. outlet A blocked drain port on the pressure- reducing valve will result in a(n) ______________________ pressure that is too high.