SHAFT 9W3377 - Caterpillar

Use the following guidelines as you troubleshoot 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. 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 machineVerify 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. If there is more than one symptom, attempt to identify a common cause.If you troubleshoot diagnostic codes and the problem is not resolved, continue troubleshooting the problem using the procedures found in the 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 Caterpillar
Share your troubleshooting information. 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 Caterpillar improve service information.