HOIST/TROLLEY UNITS Hoists utilize state of the art technology providing safe, proven and quiet designs meeting CMAA's design standards. Units are designed based on a modular principle to allow easy maintenance access. Hoist/Trolley frames are precision fabricated steel weldments. An adjustable upper and lower hook elevation limit switch is standard. Additionally, a self tensioning rope cable guide is standard. This feature insures that the hoisting cable tension is maintained during hoisting and lowering, thereby greatly increasing the wire rope life. Hoist alloy steel gearing is triple reduction helical or spur gearing running in oil bath lubrication. All bearings are anti-friction type. Convenient oil level dip sticks or check ports are provided. Hoist drums are fabricated from steel tubing with full depth machined grooving supported by large roller bearings. The hook block is semi-enclosed with the bottom sheave assemblies adequately sized for long rope life. The hook is supported by a thrust bearing allowing 360-degree rotation of lifted loads. Crane hooks are forged steel and are equipped with a spring-loaded safety latch. Trolley drive consists of 50% of wheels driven via a totally enclosed motor and reducer. Hoist motors are squirrel cage type with class F insulation. Hoist motors are designed for high performance and feature TEFC construction with cast aluminum housings. The bearings are double-shielded ball type, regreasable without disassembly. The hoist motor brake is an asbestos free self-adjusting AC disc brake or rotor pull type motor brake rated at 150% of full load motor torque. The brake is spring set and electrically released.