DD15 Troubleshooting – Section 13.2 Belt Noise

Section 13.2
Belt Noise

Excessive belt noise can mean changing the belt drive tensioner or idler pulley or the poly-V belts. First inspect the belt drive tensioner system for wear and tear.‪

Section 13.2.1
Inspection of the Belt Drive Tensioner System

Check as follows:‪

1. Inspect the belt contacts surface for chips, flaking, cracks and discoloration.

   ABRASION ‪ ‪	CHUNK-OUT ‪ ‪
   IMPROPER INSTALL ‪ ‪	CRACKING ‪ ‪
   PILLING ‪ ‪	UNEVEN RIB WEAR ‪ ‪
   MISALIGNMENT ‪ ‪	GRAVEL PENETRATION ‪ ‪
2. Inspect the bearings by rotating the pulleys to look for bearing slop or choppy feeling bearings.
3. Inspect the springs on the tensioner. If the rubber is damaged or if the spring is damaged, change the assembly.
4. Inspect the pulleys for damage and excessive wear. If pulleys or the belts are damaged, change the damaged pulley and the belt.
   
5. Check the belt wear pattern on all idler pulleys.
   1. If the belt wear pattern is incorrect (A), change the pulley and bracket assembly.
   2. If the belt wear pattern is correct (B), the idler and bracket can be reused.