PLUNGER AS 8D8809 - Caterpillar

Gather Information
Interview the operator about the problem before you begin troubleshooting, when possible. Verify the Problem
Attempt to duplicate the problem. Try to duplicate the operating conditions, when possible. Verify that the complaint is not due to normal engine operation.Diagnostic Codes
Check for any logged diagnostic codes.
Determine if the logged diagnostic codes correlate to probable causes.
Determine if the logged diagnostic codes occur at the same time as the symptoms.
Determine if the logged diagnostic codes are logged repeatedly.Repair all active diagnostic codes. Refer to Troubleshooting, "Diagnostic Trouble Codes" for the correct troubleshooting procedure.Connectors and Wiring
Check the wiring and the connectors for the following problems:
Damage
Abrasion
Corrosion
Incorrect attachmentFollow the Procedures
If these inspections do not reveal any problems, use the procedure that best describes the symptoms. The procedures in this manual provide the most efficient way to determine the root cause of the problem.Provide Feedback to Caterpillar
After the correct repair has been performed on the engine, provide brief, detailed information to Caterpillar about the repair. This information helps Caterpillar better serve the dealer and the customer.If a customer performed the repair, provide the information for the repair to the local Caterpillar dealership. The dealership will ensure that the information is recorded in the engine history file.