Anti-two block system for Terex machinery

The anti-two block system, part number 706A8816, serves as a safety device for Terex cranes. Its function is to detect when the hook block or overhaul ball approaches the boom tip or jib, preventing a two-blocking event. By monitoring this clearance, the system helps avoid structural damage to the crane, such as cable breakage or boom deformation, that can occur if the hook makes contact with the boom head.

This component is designed for use across various Terex mobile and crawler crane models. The system typically includes a limit switch installed at the boom tip and a sensor or weight assembly attached to the hoist line. When the hook block reaches a pre-set proximity, the sensor triggers the limit switch, which interrupts the crane's hoist and boom extension functions to stop movement before a collision occurs. Regular inspection of these sensors and switches is necessary to maintain proper operation of the crane's safety systems.