320C and 322C Excavators Attachment Hydraulic System – Initial Troubleshooting Procedure

Tool Control System

The monitor and the ECM are the main components of the electronic tool control system. The monitor and the ECM have a self-diagnostic function. The monitor will display any active warnings to the operator. When a machine has a problem, the first troubleshooting step is checking for diagnostic codes. You should use the monitor and the “Service Mode” function in order to determine if any system failures are detected in the electronic system.

If there are any diagnostic codes, follow the procedure for the diagnostic code. The diagnostic code procedures that pertain to the engine and pump controller for the machines that are listed in this manual are located in Testing and Adjusting, RENR3814, “Troubleshooting Diagnostic Codes”. The diagnostic code procedures that pertain to the ECM are located in this manual. Refer to Troubleshooting, “Diagnostic Code List” for the Tool Control System. Always eliminate any applicable diagnostic codes before continuing with troubleshooting.

If the problem is not electronic and if the problem is related only to the hydraulics, follow the procedures that are described in the “Testing And Adjusting” section of the service manual for the Hydraulic System. Compare the results of the operational tests with the specifications in order to determine the extent of the problem. You should determine whether the hydraulic force is adequate or whether the implement speed is a problem when you use an operational test. These problems can involve the entire machine or the problem can affect only a specific operation. The overall performance of the machine will be decreased if any failures occur in the following components: circuits of the main pump, pilot pumps and control valves. This type of problem in the hydraulic system is not detected by self-diagnostics of the control system. To detect such a problem, it is necessary to check the flow characteristics of the pumps, the main relief pressure, and the pilot pressure.