Belt Deflection Adjustment
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Loosen the 7/16 in. jam nut on the belt width adjuster screw.
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Using a 1/8 in. Allen wrench, turn the set screw inward (clockwise) to increase the distance between the sheaves (increase deflection) or outward (counter-clockwise) to decrease the distance (decrease deflection).
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Tighten the jam nut while holding the set screw stationary.