5.4 Every Six Months 5.4.1 Check Fan Belts 1. The fan sheave (A) and motor sheave (B) must be in axial alignment. Shafts must be parallel in both vertical and horizontal planes. 2. The sheaves must be in radial alignment. When sheaves are of equal width, align with a straightedge (C). When sheaves are of unequal width, align center of sheaves. 3. Check fan belts for proper tension and for signs of wear. Belt should have a slight sag at bottom of sheaves. Belt (D) is properly adjusted. Belt (E) is too loose. Belt (F) is too tight.
A
C
B
F
D E
5.5 Every Year 5.5.1 Inspect Motor Verify that cooling air to motor has not been diverted or blocked by dirty guards or other obstacles. 5.5.2 Inspect Fan Wheel Inspect fan wheel for buildup of material, which may cause an unbalanced fan wheel. An unbalanced fan wheel may lead to premature failure of the fan wheel, bearings and belt. Clean material buildup as necessary.
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