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Table 1: Belt Tensioning Forces
Force required to deflect belt 16 mm per meter of span
Deflection Force
(N)
Belt Section
Small Pulley Diameter Range
(mm)
Min. Max
SPZ
56 ~ 95
100 ~ 140
13
20
20
25
SPA
80 ~ 132
140 ~ 200
25
35
35
45
SPB
112 ~ 224
236 ~ 315
45
65
65
85
SPC
224 ~ 355
375 ~ 560
85
115
115
150
WARNING: Improper pulley alignment and belt tension are the most frequent causes of excessive
vibration as well as shortened belt and bearing life. It is important to install the pulleys
as close as practical to the bearing.
CAUTION: Do not over tighten the belts or the bearings, they may become damaged.
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