A winch is the cable-driven hoisting mechanism that raises, lowers, and holds loads on cranes, rotating telehandlers, and certain excavator attachments. It consists of a motor-driven drum, a wire rope, a gear reduction unit, and a brake system that holds the load when drive power is removed. On mobile and tower cranes, winches are the primary load-handling component; on rotating telehandlers and excavators, they serve as an auxiliary attachment for specific lifting tasks.
Winch Types
Main hoist winch: handles the rated maximum load of the machine and is dimensioned for the highest line pull and largest rope diameter on the unit.
Auxiliary winch (whip line): mounted alongside the main hoist, used for lighter, faster lifts such as placing rebar cages or small components; typically rated at a fraction of main hoist capacity with higher line speed.
Secondary winch: a separate unit for a distinct function, for example luffing jib operation, boom extension assistance, or — on telehandlers and excavators — for lifting steel bundles or operating man baskets as an attachment rather than a built-in structural element.
Technical Parameters
Key specification values vary by machine class and application:
- Rated single-line pull: typically 20–250 kN on mobile and crawler crane main hoists, lower (10–60 kN) on auxiliary winches
- Wire rope diameter: commonly 16–22 mm on main hoists, construction 6x36 or 8x19 depending on rope manufacturer
- Drum capacity: multiple rope layers (up to 5–6), with line pull and line speed decreasing as layers increase due to growing effective drum diameter
- Line speed: up to 100–120 m/min unloaded (empty hook), substantially reduced under rated load
- Brake type: multi-disc, spring-applied and hydraulically released, holding rated load without power supply
Safety Systems
Winch control on modern cranes is integrated with load moment limiters and boom angle sensors. Redundant measurement systems are used so that a single sensor or hydraulic fault does not result in uncontrolled load lowering; winch control algorithms are designed to prevent load drops even if hydraulic pressure is lost. Wind monitoring systems can automatically reduce permissible working radius, which indirectly affects permissible winch loads at extended boom lengths.
Application in Rotating Telehandlers
On 360° rotating telehandlers, a winch is one of several interchangeable attachments alongside forks and man baskets. These functions are used sequentially: an operator switches between fork, winch, and basket via quick-attach systems, changing the active tool in a matter of minutes rather than operating multiple functions at the same time. The winch attachment in this configuration is typically used for lifting steel bundles or similar bundled materials rather than bulk palletised loads.
Winches in BauMaschinenMarkt Coverage
In the technical analysis of Liebherr crane technology, winch control is discussed as part of the broader safety architecture: advanced winch control algorithms are engineered to prevent load drops even during hydraulic system failures, working alongside boom angle sensors and load moment limiters with redundant measurement systems (Liebherr Crane Technology: Technical Analysis of the Innovation Strategy). The report on rotating telehandlers describes the winch as one of three interchangeable tools — alongside forks and a man basket — fitted via quick-attach systems such as Manitou's Easy-Connect, allowing an operator to lift steel bundles with the winch without swapping the base machine (Rotating Telehandlers: How 360° Turrets Combine Crane, Forklift and Aerial Work).
