45-9
Servicing Vee Belts
EN
a. Use a spring balance to pull the belt down at
the centre of the span.
b. When the belt has been pulled down
[measure using a rule] by the deection
calculated in step 4, read o the force from
the spring balance.
Belt Tensioning Measurements
A - 16mm deection per metre (0.6in per 3ft).
B - Belt tension indicator applied to mid-span.
C - Centre to centre distance.
NOTICE
After the drive has been running for 15 to
20 minutes, the plant should be stopped
and the tension checked. If necessary, re-
adjusted to the basic setting force value by
repeating the above procedure from step
1.
[x1] BASIC SETTING FORCES
SPB BELT SECTION
Small Pulley Diameter:
112 to 160mm (4.4 to 6.3in) · · · · 4.0kgf (8.8lbf)
170 to 224mm (6.7 to 8.8in) · · · 5.1kgf (11.2lbf)
236 to 355mm (9.3 to 14.0in) · · 6.3kgf (13.9lbf)
Over 355mm (14in)· · · · · · · · 6.6kgf (14.6lbf)
SPC BELT SECTION
Small Pulley Diameter:
224 to 250mm (8.8 to 9.8in) · · · 7.1kgf (15.7lbf)
265 to 355mm (10.4 to 14in) · · · 9.4kgf (20.7lbf)
Over 375mm (14.8in)· · · · · · · 12kgf (26.5lbf)
[x1.25] BASIC SETTING FORCES
If recommended for new belts
SPB BELT SECTION
Small Pulley Diameter:
112 to 160mm (4.4 to 6.3in) · · · 5.1kgf (11.2lbf)
170 to 224mm (6.7 to 8.8in) · · · 6.3kgf (13.9lbf)
236 to 355mm (9.3 to 14.0in) · · 7.9kgf (17.4lbf)
Over 355mm (14in)· · · · · · · · 8.3kgf (18.3lbf)
SPC BELT SECTION
Small Pulley Diameter:
224 to 250mm (8.8 to 9.8in) · · · 8.9kgf (19.6lbf)
265 to 355mm (10.4 to 14in) · · · 11.8kgf (26lbf)
Over 375mm (14.8in)· · · · · · · 15kgf (33.1lbf)
6. If a belt tension indicator is not available:
7. If the measured force falls within the values
given, the drive should be satisfactory.
A measured force below the lower value
indicates under-tensioning. Some new drive
belts are tensioned to the x1.25 Setting Force
value to allow for the normal drop in tension
during the running-in period. This is not
recommended for all belts.
8. Replace all guards before start-up.
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