Caterpillar 3406 — Inspect and Adjust Alternator and Fan Drive Belts
Maintenance
For the Caterpillar 3406, from the Caterpillar operator's manual.
Applies to: Caterpillar 3406
Parts for this job
Part numbers from the service-parts list for Caterpillar 3406. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Inspect the condition and the adjustment of the alternator belts and the fan drive belts.
- Replace the belts in sets if either belt is frayed or cracked.
- Apply 25 lb. (110 N) force midway between the pulleys. Deflection should be 2 inch (1 cm).
- To adjust fan drive belts: loosen the mounting bolts and adjust with the adjusting bolt; then tighten the mounting bolts.
- To adjust alternator belts: loosen the mounting bolt and the locknut; adjust by tightening or loosening the adjusting nut; then tighten the locknut and the mounting bolt.
Specs & values
- Apply 25 lb. (110 N) force midway between the pulleys.
- Deflection should be 2 inch (1 cm).
Full service-parts list: Caterpillar 3406 →
Source: Caterpillar operator'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.