Initial Inspection and Diagnostic Overview
Accessory DriveInspection and Verification
1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical damage.
Visual Inspection Chart:
Visual Inspection Chart
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
NOTE: Up to 15 cracks in a rib over a distance of 100 mm (3.93 inch) can be considered acceptable. If damage exceeds the acceptable limit or any chunks are found to be missing from the ribs, a new belt must be installed.
Under no circumstances should the belt or tensioner be lubricated as potential damage to the belt material construction and tensioner damping mechanism can occur.
4. The condition of the drive belt should be compared against the illustration and appropriate action taken.
1. Small scattered deposits of rubber material. This is not a concern, therefore, installation of a new belt is not required.
2. Longer deposit areas building up to 50 percent of the rib height. This is not considered a concern but it can result in excessive noise. If noise is apparent, install a new belt.
3. Heavy deposits building up along the grooves resulting in a possible noise and belt stability concern. If heavy deposits are apparent, install a new belt.
5. Check the belt for cracks. Up to 15 cracks in a rib over a distance of 100 mm (3.93 inch) can be considered acceptable. If cracks exceed this standard, install a new belt.
6. There should be no chunks missing from the belt ribs. If the belt shows any evidence of this, install a new belt.
7. If the concern is not visually evident, verify the symptom and GO to Symptom Chart. Symptom Related Diagnostic Procedures