BELT TENSIONING INSTRUCTIONS
Tensioning Forces
Belt Section
Force required to deflect belt 16mm per metre of span
Small Pulley Diameter
Kilogram Force
SPZ
56-95 mm
1.3-2.0 kg
100-140 mm
2.0-2.5 kg
SPA
80-132 mm
2.5-3.6 kg
140-200 mm
3.6-4.6 kg
SPB
112-224 mm
4.6-6.6 kg
236-315 mm
6.6-8.7 kg
SPC
224-355 mm
8.7-11.7 kg
375-560 mm
11.7-15.3 kg
Belt Tensioning Procedure Using A Belt Tension Indicator
Span
Force
Deflection 16mm
per metre of span.
Calculate the deflection distance in mm on a basis of 16mm per metre of
centre distance.
Set the lower marker ring at the deflection distance required in mm on the
lower scale.
Set the upper marker ring against the bottom edge of the tube.
Place the belt tension indicator on top of the belt at the centre of the span, and
apply a force at the right angles to the belt deflecting it to the point where the
lower marker ring is level with the top of the adjacent belt.
Read off the force value indicated by the top edge of the marker ring.
Compare this force to the kgf value in the table above.
If a Belt Tension Indicator is not available, a spring balance and rule will
suffice.
Important
AFTER THE DRIVE HAS BEEN RUNNING FOR APPROXIMATELY 30 MINUTES,
THE TENSION SHOULD BE CHECKED AND RE-ADJUSTED TO THE HIGHER
VALUE, IF NECESSARY.
