OP000599
Inspection, Maintenance and Adjustment
4-32
Check Engine Fan Belt Tension
1.
Inspect every 250 hours. (Inspect after first 50 hours of
operation.)
2.
With the engine shut off, check the tension of the fan belt
by pressing downwards on the belt, midway between the
fan pulley and alternator pulley. The belt should flex
approximately 10 mm (0.4 in). See Figure 46. To adjust the
belt, loosen the alternator adjustment plate bolts, adjust the
belt tension and retighten the bolts.
Check Engine Fan Belt Wear
1.
Replace badly worn, greasy or severely cracked belts
immediately. These conditions prevent proper belt
function. Visually inspect the belt. Check the belt for
intersecting cracks. Transverse (across the belt width)
cracks are acceptable. Longitudinal (direction 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.
2.
Before installing new belts, make sure all pulley grooves
are clean and not worn. Replace pulley, if damaged, or if
the grooves are worn.
3.
All pulley support bearings, shafts, and brackets must be in
working order.
Figure 46
FAN
ALTERNATOR
CRANKSHAFT
COMPRESSOR
10mm/10kg
FG000353
IMPORTANT
A loose fan belt can cause engine overheating, poor
charging, and/or premature belt wear. A belt that is too tight
can cause damage to the water pump, alternator bearing or
belt.
Figure 47
WARNING!
Keep clear of engine fan and fan drive belts when the
engine is running. Rotating fan and belt contact can cause
injury.
WARNING!
When checking, adjusting or replacing drive belts, care
must be taken to prevent accidental cranking of the engine.
Be sure the starter switch is in the "OFF" position and the
controls are tagged.
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