Precor TRM10/GEN06 Service Manual page 125

5 Tighten the take up roller mounting bolts alternately in order to
evenly tighten the running belt. Tighten bolts until the gauges read
.55%, which is five and 1/2 lines past the number 3.
6 Remove both gauges from the running belt.
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Figure 58: Running Belt Gauge_55%
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