Hoist Gearbox
A hoist gearbox is a heavy-duty reducer for the lifting mechanism of a crane or winch, where it carries the full suspended load through every start, stop and lowering cycle and must hold or controllably lower that load safely. It is usually a multi-stage helical or planetary drive whose gears, shafts and bearings are sized to a high service factor, because main-hoist and auxiliary-hoist duty is among the most severe in AGMA's load-class tables. Load-holding — through a backstop, mechanical load brake or external brake — is integral to the design, not an afterthought.
AGMA service factors for hoisting are high, commonly around 2.5 for main hoist and 2.5-3.0 for auxiliary hoist, while FEM/ISO mechanism classes M5-M8 set the working intensity. Ratios span roughly 10:1 to over 100:1 across multiple stages, torque into the hundreds of thousands of Nm, and helical efficiency near 97% per pass (lower for high-ratio planetary). Rating follows AGMA 2101/ISO 6336 with AGMA 6010 enclosed-drive practice and ISO 1328 / AGMA 2015 gear quality.
Gears are case-hardened, ground alloy steel (18CrNiMo7-6) in rigid housings on heavy bearings, with a backstop or load brake, and seals suited to indoor or outdoor exposure.
Integration covers motor flange or coupling, a hollow or solid output to the drum or rope sheave, mounting brakes, and synthetic PAO ISO VG 220/320 lubrication, with service factor and brake selection set to the hoist duty class and safety requirement.
Himalay's MSME partners manufacture hoist gear drives with gear-rating to AGMA/ISO 6336, ISO 9001 quality systems, load and efficiency test reports and traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) coordinated as part of the standard order flow.
