SEBU7899-05 67 Maintenance Section Belts - Inspect/Adjust/Replace Alternator Belt Adjustment 1. Turn the start switch to the OFF position. Turn the ignition switch (if equipped) to the OFF position and remove the key and all electrical loads. 2. Disconnect the negative battery terminal at the battery that goes to the start switch. Ensure that the cable cannot contact the terminal. When four 12 volt batteries are involved, the negative side of two batteries must be disconnected. 3. Tape the leads in order to help prevent accidental starting. 4. Proceed with necessary system repairs. Reverse the steps in order to reconnect all of the cables.
g00788814 Illustration 34 i02042962 Belts - Inspect/Adjust/Replace 1. Remove the belt guard. SMCS Code: 1357-025; 1357-040; 1357-510 2. Loosen mounting bolts (1) and adjusting bolt (2). Inspection 3. Move the assembly in order to increase or decrease the belt tension. Inspect the alternator belt and the fan drive belts for wear and for cracking. Replace the belts if the belts are not in good condition. 4. Tighten adjusting bolt (2). Tighten mounting bolts (1). Check the belt tension according to the information in the Service Manual, “Specifications”. 5. Reinstall the belt guard.
If new drive belts are installed, check the drive belt tension again after 30 minutes of engine operation at the rated rpm. Slippage of loose belts can reduce the efficiency of the driven components. Vibration of loose belts can cause unnecessary wear on the following components: Adjustment of the Fan Drive Belt Belts 1. Remove the belt guard. Pulleys 2. Loosen the mounting bolt for the pulley. Bearings 3. Loosen the adjusting nut for the pulley. If the belts are too tight, unnecessary stress is placed on the components. This reduces the service life of the components. 4. Move the pulley in order to adjust the belt tension. 5. Tighten the adjusting nut. Replacement 6.
Tighten the mounting bolt. 7. Reinstall the belt guard. For applications that require multiple drive belts, replace the drive belts in matched sets. Replacing one drive belt of a matched set will cause the new drive belt to carry more load because the older drive belts are stretched. The additional load on the new drive belt could cause the new drive belt to fail. If new drive belts are installed, check the drive belt tension again after 30 minutes of engine operation at the rated rpm.