Caterpillar — Alternator and Fan Belts - Inspect/Adjust/Replace
Adjustments
From a Caterpillar owner's manual covering: 3054E, 3056E, C12. Check it applies to your exact model before use.
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Before you start
- Replace belts that are worn or damaged.
- For multiple drive belts, replace the belts in matched sets.
Procedure
- Loosen mounting bolts (2) and adjusting bolt (1).
- Move the alternator in order to increase or decrease the belt tension.
- Tighten adjusting bolt (1). Tighten mounting bolts (2).
Specs & values
- Apply 45 N (10 lb ft) of force midway between the pulleys.
- A correctly adjusted belt will deflect 10 mm (0.39 inch).
- If new belts are installed, check the belt tension again after 20 hours of engine operation.
Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.