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MAINTENANCE PROCEDURES
4.9.6.e
CHECKING AND ADJUSTING THE FAN BELT TENSION
Soon after the machine has been stopped, the engine is very hot and may cause burns; let the engine
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cool down before carrying out any check.
To carry out this maintenance operation it is necessary to tilt the cab floor. Carefully follow the instruc-
q
tions given in paragraph "3.2.9 TILTING THE CAB FLOOR (machines with canopy)" or have this opera-
tion carried out by your Komatsu Distributor.
CHECK
The fan belt can be reached after tilting the cab floor (see "3.2.9
TILTING THE CAB FLOOR (machines with canopy)").
1.
The check is manual: press the belt with a thumb on the
intermediate point between the drive shaft pulley and the fan
pulley with a force equal to 98 Nm (10 kg); the resulting
deflection must be approximately 9-13 mm..
2.
If the deflection exceeds this value, adjust by proceeding as
indicated below.
IMPORTANT
Guards are installed in the area of the engine to protect
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personnel from moving parts.
These guards should only be removed by a Komatsu ser-
vice engineer unless specific instructions are given in this
manual.
ADJUSTMENT
1.
Loosen the adjusting screw (2) and the alternator fastening
screws (3).
2.
With a lever inserted between the alternator (1) and the
engine block, make the alternator slide.
3.
Lock the adjusting screws and the alternator fastening
screws, then check again.
IMPORTANT
If the belt is worn, change it and check the tension again af-
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ter a few hours of operation.
232
WARNING
WEAM012405
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