Komatsu WA800-3E0 Series Operation & Maintenance Manual page 264

SERVICE PROCEDURE
ADJUSTMENT
1. Install adjustment bolt (1) and locknut (2) to yoke (3).
2. Tighten adjustment bolt (1) until the clearance between pin
(6) of the tension pulley (5) and the end face of the oblong
hole of yoke (3) is 0 mm, then tighten a further 6 turns.
Lock securely with locknut (2).
After operating for 1 hour, if there is a gap between pin (6)
of tension pulley (5) and the oblong hole of yoke (3), repeat
the procedure in Step 2 to adjust again.
If there is any squealing from the fan belt, adjust in the
same way.
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MAINTENANCE