Doosan DX190W, Operation And Maintenance Manual

Page: 228 / 315

OP000530 Inspection, Maintenance and Adjustment
4-32
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.
4. 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 detrimental to belt performance.
5. Do not force the belts into the pulley grooves by prying with
a screwdriver or 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.
6. Belts on new machines and replacement belts lose their
tension as they seat into the pulley grooves. Check the
tension of new belts at 50 hour intervals until tension is
stabilized and thereafter, every 250 hours. If the tension
falls below the required minimum, the belt slips damaging
the belts and pulley grooves.
NOTE: When operating in abrasive conditions, check
tension every 100 hours.
OK
OK
HAAA4030
Figure 50
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.