Crane Duty Gearbox
A crane-duty gearbox is a heavy-duty enclosed drive built for the intermittent, reversing and shock-loaded service of crane travel, slewing and hoisting mechanisms, and is selected against FEM/ISO mechanism duty classes (M5-M8) and AGMA crane load classes rather than steady-load ratings. It is typically a parallel-shaft or right-angle helical/bevel-helical reducer whose gears, shafts and bearings are oversized so that frequent starts, plugging reversals and impact loads do not fatigue the train. Because crane duty is defined by the whole mechanism — hoist, brake, structure and control — the gearbox is rated to a high service factor to cover that severity.
Reported AGMA service factors for crane work are high: transfer and travel drives around 1.25-1.5, slewing and boom-hoist drives 2.5-3.0, and traction drives up to 3.0, with FEM classes M5-M8 setting the working-intensity band. Ratios commonly span 8:1 to over 100:1 across two to four stages, torque into the hundreds of thousands of Nm, and efficiency near 97% per helical pass. 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 roller bearings, with backstops where load-holding is needed and seals suited to outdoor exposure.
Integration covers motor coupling or flange, solid or hollow output with shrink disc, foot or shaft mounting, integral or mounted brakes, and synthetic PAO ISO VG 220/320 lubrication, with service factor set to the FEM duty class and shock profile.
Himalay's MSME partners manufacture crane-duty 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.
