Fransgard SV-2500SE, Manual, Page: 6 / 12

4
Fitting the belt drive
The pulleys must be flush, and the shafts must be parallel.
After approx. 10
– 20 min. driving, the V-belt must be retightened, the belts must max.
could be pressed 15mm per meter in span. If the belt is defective it must be replaced. If
the belt is new, you must retighten sometimes, this can contribute to the belt lasting longer
and you avoid downtime.
The strap must be tightened so much that it feels
“alive” when it is set in oscillations with
one finger. Tightening the belt destroys the cord and causes unnecessarily high bearing
load.
If a closer check of the belt tension is desired, this can be done as follows: The span is
measured as shown in the sketch. In the middle of the span, a force K, perpendicular to
the span, is placed sufficient to deflect the belt 15 mm per 1 m span. The deflection force
for each V-belt should be within the minimum and maximum force given in the schedule.
The schedule applies to the classics.
Correct in-correct
Deflection
Span
Deflection K (per belt)
Belt profile