DD15 Worn Belts Troubleshooting

Check as follows:‪

1. Check belt conditions for the fan and water pump belts.
   1. If the belts are not in good conditions, replace them.
   2. If the belts are OK, go to the next step.
2. Check the condition of the tensioner springs.
   1. If the springs are not in good conditions, replace the tensioner.
   2. If the springs are OK, go to the next step
3. Check the condition of the idler and accessory drive pulleys. Replace and repair as necessary.
4. Start and run the engine.
5. Run the engine through its operating range with no-load for approximately five minutes, allowing the engine coolant to reach normal operating range.
   1. If the engine coolant temperature is 88-96°C (190-210°F), no further troubleshooting is required. Shut down the engine.
   2. If the engine coolant temperature is not 88-96°C (190-210°F), shut down the engine. Check thermo-modulated fan; refer to “11.6 Inoperative Thermo-Modulated Fan” .