Belt tension should be checked initially between the first 20 to 40 hours of engine operation.
After the initial check, the belt tension should be checked at every oil change.
To maximize the engine performance, inspect the belts for wear and for cracking. Replace belts that are worn or damaged.
For applications that require multiple drive belts, replace the belts in matched sets. Replacing only one belt of a matched set will cause the new belt to carry more load because the older belt is stretched. The additional load on the new belt could cause the new belt to break.
If the belts are too loose, vibration causes unnecessary wear on the belts and pulleys. Loose belts may slip enough to cause overheating.
If the belts are too tight, unnecessary stresses are placed on the pulley bearings and on the belts. This stress may shorten the service life of the components.
Remove the belt guard, if equipped. Inspect the condition and adjustment of the alternator belts and accessory drive belts (if equipped).
If the belt does not require replacement or adjustment, install the belt guard. If the belt requires adjustment or replacement, follow the procedure below.
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| Illustration 1 | g02533519 |
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(1) Adjusting nuts
(2) Mounting bolts | |
- Slightly loosen the mounting bolts and the adjusting nuts.
- To check the belt tension on v-belts, apply
110 N (25 lb ft) of force midway between the pulleys. A correctly adjusted belt will deflect9 mm (0.35 inch) to15 mm (0.59 inch) . - If necessary, tighten or loosen the adjustment nuts to adjust the belt tension.
- If necessary, remove the belt guard and replace the belts.
Note: Always replace v-belts in sets. Never replace one belt from a set.
- Tighten adjusting the nuts and the mounting bolts. Refer to the Specifications Manual, SENR3130, "Torque Specifications" topic.
- If new belts are installed, check the belt tension after 30 minutes of engine operation at the rated rpm.
- Install the belt guard.