Komatsu PC18MR-3, Operation & Maintenance Manual

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MAINTENANCE PROCEDURES
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4.9.6.e CHECKING AND ADJUSTING THE FAN BELT TENSION
WARNING
q
Soon after the machine has been stopped, the engine is very hot and may cause burns; let the engine
cool down before carrying out any check.
q
To carry out this maintenance operation it is necessary to tilt the cab floor. Carefully follow the instruc-
tions given in paragraph "3.2.9 TILTING THE CAB FLOOR" or have this operation carried out by your Ko-
matsu Distributor.
CHECK
The fan belt can be reached after tilting the cab floor (see "3.2.9
TILTING THE CAB FLOOR").
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
q
Guards are installed in the area of the engine to protect
personnel from moving parts.
These guards should only be removed by a Komatsu serv-
ice engineer unless specific instructions are given in this
manual.
ADJUSTMENT
1. Lift the platform, see "3.2.9 TILTING THE CAB FLOOR".
2. Loosen the adjusting screw (2) and the alternator fastening
screws (3).
3. With a lever inserted between the alternator (1) and the
engine block, make the alternator slide.
4. Lock the adjusting screws and the alternator fastening
screws, then check again.
5. Close the cab floor, see "3.2.9 TILTING THE CAB FLOOR".
IMPORTANT
q
If the belt is worn, change it and check the tension again af-
ter a few hours of operation.