Kubota XN12-8 Operation Manual page 125

Maintenance
After first 50h (For new machine only)
alternator (7) and adjust the tension of fan
belt (1).
Increase tension: Clockwise
Reduce tension: Counter-clockwise
3. Tighten bolt (5) and lock nut (4).
Note: After the replacement with new belt, run
the engine at low idling speed for
approximately 3~5min to run in new belt and
then adjust the tension.
Replacement of engine oil and filter
Refer to page 5-30"Replacement of engine oil
and filter ".
5-24