Komatsu PW130ES-6K Operation & Maintenance Manual page 213

SERVICE PROCEDURE MAINTENANCE.
All pulley support bearings, shafts and brackets must be in work-
ing order.
When replacing belts and pulleys, pulley alignment must be
checked with belts tensioned and brackets securely clamped. A
misalignment that can be detected by the naked eye is detrimen-
tal to belt performance.
During belt installation, do not force the belts into the pulley
grooves by prying with a screwdriver on pry bar. This will damage
the belt side cords which will cause the belts to turn and result in
complete destruction of the belts in operation.
Belts on new machines and replacement belts lose their tension
as they seat into the pulley grooves. Check the tension of new
belts at 20 hour intervals until tension is stabilized and thereafter,
every 250 hours. If the tension falls below the required minimum,
the belt slips, and damages the belts and pulley grooves.
REMARK
When operating in abrasive conditions, check tension every
100 hours.
Visually inspect the belts for intersecting cracks. Transverse
(across the belt width) cracks are acceptable. Longitudinal (direc-
tion of belt length) cracks that intersect with transverse cracks are
not acceptable. Replace the belt if it is frayed or has pieces of
material missing.
CHECK FAN BELT TENSION, ADJUST CHECKING
TENSION
The engine is equipped with an automatic belt tensioner that
maintains correct tension on the drive belt. To check belt tension
a Gates type gauge must be used because of the wide drive belt.
Proper tension should be 355 to 455 N.m gauge value.
If a Gates type gauge is not available, tension may be checked by
belt deflection. Press the belt with your finger at the longest span
and measure the deflection. Maximum deflection 9.5 to 12.7 mm.
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