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(2) Checking and adjusting radiator fan V-belt
When there is not enough tension in the V-belt, the V-belt
will slip making it impossible for the alternator to generate
power and cooling water pump and cooling fan will not
work causing the engine to overheat.
Check and adjust the V-belt tension (deflection) in the
following manner.
1) Press the V-belt with your thumb [approx.
98N(10kgf)] at the middle of the V-belt span to check
the tension (deflection).
Available positions to check and adjust the V-belt
tension (deflection) are at the A, B or C direction as
shown in the illustration right.
You may choose a position whichever you can easily
carry out the check and adjustment on the machine
unit.
"New V-belt" refers to a V-belt, which has been used less than 5 minutes on a running engine.
"Used V-belt" refers to a V-belt, which has been used on a running engine for 5 minutes or more.
The specified deflection to be measured at each position should be as follows.
(Unit: mm)
Direction
A
B
C
For used V-belt
10 14
7 10
9 13
For new V-belt
8 12
5 8
7 11
2) If necessary, adjust the V-belt tension
(deflection). To adjust the V-belt tension, loosen
the set bolt and move the alternator to tighten the
V-belt.
After replacing with a new V-belt and adjusting it,
run the engine for 5 minutes and readjust the
deflection to the value in the table above.
3) Visually check the V-belt for cracks, oiliness or
wear. If any, replace the V-belt with new one.
