Install a simple pulley system above the cable tray. Tie the new cable to the string and pull (or push) the string through the pulleys. Efficient, cost-effective cutting, measuring and winding of cables and wires, steel cables, pipes, hoses and profiles requires high-performing but. nt forces being exerted on the system. Outside tests have shown that if the pulley tread diameter is doubled, cable bending life can incr it rests along the pulley's groove. Understanding their construction and functionality is crucial for optimal usage. The cable tray pulleys are. Motion Control Technologies specializes in pulley system engineering. We manufacture custom-designed, optimally sized pulleys for every type of application so that you always have the right-sized part to ensure the safety, durability, and peak performance of every project.