6.6. V-belts
(1) Change the V-belts if necessary
If in the case of a multiple belt drive, wear or differing tensions are found, always replace
the complete set of belts.
(2) Checking condition
Check V-belts for cracks, oil, overheating and wear.
(3) Testing by hand
•
V-belt
The tension is correct if the V-belts can
be pressed in by about the thickness of
the V-belt. (no more midway between
the belt pulleys)
A more precise check of the V-belt
tension is possible only by using a V-
belt tension tester.
•
Poly belt
Poly belt will be properly tensioned if
the deflection force “F” is applied mid-
way between the belt’s tangent points
with the pulley.
T = 0.015 x S (about 1.5mm per 100mm)
T = 0.015 x *S (mm)
(T : Deflection, S : Span )
*S = C
2
- (mm)
- 172 -
MAINTENANCE OF MAJOR COMPONENTS
(D-d)
2
2
C : Distance of pulleys (mm),
D : Large pulley diameter (mm),
d : Small pulley diameter (mm)
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