4.9 Motor Installation Couplings, drive belts, chains or other mounted devices must be in proper alignment, balanced and secure for safe motor operation. 4.9.1 Mounting This motor must be securely mounted. Sufficient ventilation must be provided to insure proper operation. 4.9.2 Install Sheaves And 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 A B C
should have a slight sag at bottom of sheaves. Belt (D) is properly adjusted. Belt (E) is too loose. Belt (F) is too tight.
F
D E
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