525D, 535D, 545D and 555D Wheel Skidders Symptom Troubleshooting Caterpillar

Use the following guidelines when troubleshooting a symptom.

Know the Machine

Understand the operation of the machine. Know if the symptom is a characteristic of normal operation or if the symptom is a failure.

Read the Systems Operation information to understand the systems of the machine. Understand the interaction of the machine systems.

Understand the Symptom

Speak with the operator about the symptom. Inspect the machine and look for problems. Notice any unusual odors in the air. Listen for unusual noises. Acquire the following Information:

• The performance of the machine prior to the failure.

• First occurrence of the symptom.

• The operating conditions at the time of the failure.

• The sequence of events prior to the failure (order of the occurrences).

• The troubleshooting steps that have been taken.

• The history of repairs of the machine.

• The preventive maintenance of the machine.

• Related service information about current problems that affect the serial number of the machine.

Perform the "Visual Inspection" steps.

Verify the Symptom

When possible, attempt to duplicate the symptom. Operate the machine and repeat the conditions that caused the failure. Check the gauges inside the cab. Notice any unusual odors in the air. Listen for unusual noises.

Determine if the ECM has detected any faults. A diagnostic code is used to specify each detected fault.

Determine Possible Causes

Use the information from the operator and your inspection. Attempt to identify a common cause if there is more than one symptom.

If the problem is not resolved after troubleshooting the diagnostic codes, continue troubleshooting using the "Symptom Troubleshooting" section of this manual. Identify the component that is the most probable cause of the symptom.

Test and Repair the System

Use the tests and procedures in this manual to verify the cause of the symptom. Once the cause has been identified, repair the failure. Test the system again to verify that the symptom is resolved.

Provide Feedback to AVSpare

Share your troubleshooting information with AVSpare. Use the form in "SIS" or "CBT" feedback to write a brief description about the symptom, testing, and repair. Include your phone number or e-mail address so that you can be contacted. This feedback information helps AVSpare improve service information.