Komatsu PC78US-6 Operation & Maintenance Manual page 241

MAINTENANCE
NOTICE
Check each pulley for damage, wear of the V-groove, and wear of the
V-belt. In particular, be sure to check that the V-belt is not touching the
bottom of the V-groove.
If the belt is stretched and there is no allowance for adjustment, or if it
is cut or cracked, please contact your Komatsu distributor for
replacement.
MAINTENANCE PROCEDURE
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