Precautions for Pulley Assembly

1. The final cleaning prior to assembly must be performed using gasoline to ensure that all components are clean and dry. This guarantees that mating surfaces fit tightly, are free of oil contamination, and possess sufficient friction.

2. The hex socket bolts used for assembly must also be cleaned with gasoline and allowed to dry before installation. Lubricating oil or grease must not be applied to the bolts or the threaded holes; this ensures that, once tightened, the bolts possess sufficient frictional self-locking capability.

3. As the three hex socket bolts are being seated, they must be tightened alternately to ensure that the tapered bushing is subjected to uniform axial force, thereby guaranteeing proper coaxial alignment between the pulley and the bushing.

4. Before installation, measure the length of the assembly bolts to ensure that, once tightened, they will bear against the bottom of the tapered bushing's blind holes. This guarantees a tight fit between the tapered surfaces and ensures that the bolts receive a counter-thrust from the bottom of the blind holes, thereby generating an anti-loosening effect analogous to the "double-nut" principle.

5. After the pulley has been secured, use a string line to inspect and adjust the relative positioning of the driving and driven pulleys, ensuring that both pulleys lie within the same plane and that the belt tension is appropriate.

6. The pulley guard must be intact and securely mounted to prevent major safety accidents—such as those caused by a belt snapping or a pulley becoming loose and disengaging—during operation.

7. The tapered bushing is a consumable component; after prolonged operation, its inner bore and keyway may sustain damage. It should be inspected prior to every assembly; if any defects are discovered, the component must be replaced immediately [1].