Before beginning diagnosis, review the system description and operation in
order to familiarize yourself with the system functions. Refer to
Front Drive Axle Description and Operation
.
Noise Diagnosis
Any gear-driven unit produces a certain amount of noise that is normal and that
conventional repairs or adjustment cannot eliminate. Slight noise that is heard only
at a certain speed or under unusual or remote conditions is acceptable. For example,
this noise tends to reach a peak at speeds from 60-100 km/h (40-60 mph)
depending upon road and load conditions, or upon gear ratio and tire size. Noise of
this kind does not indicate trouble in the axle assembly.
When an axle is suspected of being noisy, make a thorough test in order to determine
whether the noise originates in the tires, road surface, wheel bearings, engine, transmission,
propeller shaft, or axle assembly.
Classifying the Symptom
Front Drive Axle symptoms can usually be classified into the following categories:
Leak and noise related symptoms are diagnosed with the Front Drive Axle section.
For vibration related symptoms, refer to
Diagnostic Starting Point - Vibration Diagnosis and Correction
in Vibration Diagnosis
and Correction for diagnosis.
Visual/Physical Inspection
• | Inspect the system for loose or missing fasteners. |
• | Inspect the system for loose or leaking components. |
• | Inspect the system for obvious damage or conditions which may cause
the symptom. |
Symptoms List
Refer to a symptom diagnostic procedure from the following list in order to
diagnose the symptom.