Winch Drive Series — Mobile Crane & Construction Lifting Equipment
Winch Drive Planetary Gearbox for Truck-Mounted Crane
Truck-mounted cranes — from 25-tonne city cranes to 1,000-tonne all-terrain behemoths — share a common mechanical challenge: the main and auxiliary hoist winch gearboxes must fit within the boom head and the crane superstructure while delivering the high reduction ratios and fail-safe holding brakes required by EN 13000 and ASME B30.5 crane safety standards. The планетарни мењач погона витла must handle the shock loads of dynamic lifts, the sustained loads of long picks, and the rapid duty cycles of construction crane work — all in an outdoor environment from arctic to tropical.
EN 13000 / ASME B30.5 compliant
Dual SAHR brake for man-riding
-40°C to +55°C operating range
Truck-mounted and all-terrain mobile cranes are among the most versatile and widely used lifting machines in construction, industrial plant maintenance, and infrastructure work. From a 25-tonne rough terrain crane erecting precast concrete panels on a housing site to a 1,000-tonne all-terrain crane assembling offshore wind turbine nacelles, the hoist winch drive gearbox is the component that translates engine or electric power into controlled, precise wire rope motion — and in doing so must meet the crane safety standards that classify these machines as life-safety equipment. Korea Ever-Power supplies planetary winch drive gearboxes for truck-mounted crane applications covering the full capacity range, with EN 13000 and ASME B30.5 design compliance, dual independent brake capability, and the wide temperature range and outdoor environmental resistance that construction site deployment demands across every climate zone.
Mobile Crane Hoist Applications: Rough Terrain to All-Terrain
Rough Terrain Cranes — 25 to 120 Tonne (2,000–12,000 Nm): Rubber-tyred cranes designed for off-road travel and short-radius lifting on construction sites. Single-drum main hoist with maximum line pull of 40 to 120 kN at minimum drum layer. These machines work in intermittent duty — multiple short picks per hour during structural steel or precast erection — with the hoist drum accumulating 200 to 400 complete cycles per day. The gearbox operates in the outdoor construction environment with dust, cement slurry, and temperature variation from pre-dawn cold to afternoon heat. EN 13000 requires the crane design to prevent uncontrolled load descent under all failure conditions — the gearbox SAHR brake must hold the rated single-line pull statically with the motor de-energised and must re-engage within the time specified by the crane control system on operator release of the hoist lever.
All-Terrain Cranes — 100 to 500 Tonne (8,000–35,000 Nm): Multi-axle highway-capable cranes that combine road travel performance with off-road capability. Two or three hoist drums — main hoist, auxiliary hoist, and (on larger units) a separate luffing winch for the fly jib — each with independent gearbox and motor. Main hoist maximum line pull of 100 to 350 kN. These cranes perform complex lifts — tandem lifts with multiple cranes, picks with long booms at maximum radius, and critical infrastructure lifts that may take 6 to 12 hours — requiring the hoist gearbox to hold sustained loads at rated capacity for extended periods while the rigging crew works the load into position.
Crawler Crane Conversions and Large Capacity Units — 200 to 1,000 Tonne (15,000–50,000 Nm): The largest truck-mounted and self-propelled wheeled cranes approach the capacity of small crawler cranes and are used for heavy industrial lifting — plant and pressure vessel installation, offshore load-out operations, and modular construction. Main hoist maximum line pull up to 500 kN. The gearbox torque requirement at this capacity level demands three or four planetary stages with output torques up to 50,000 Nm. At these sizes, the gearbox weight and envelope become critical constraints — the hoist gearbox must be transportable as part of the crane within the standard transport permit weights and widths, placing a premium on the torque density advantage of the planetary architecture over parallel-shaft alternatives.
EN 13000 and ASME B30.5: Crane Hoist Gearbox Safety Requirements
Brake Design Factor — EN 13000
EN 13000 Clause 5.3.3 requires that the hoist brake be capable of holding 1.5 times the maximum rated line pull statically with the motor de-energised. This 1.5 times factor accounts for dynamic load amplification during sudden stop and the possibility of load distribution variation in multi-part reeving systems. Korea Ever-Power mobile crane hoist gearbox SAHR brakes are sized to hold 1.5 times maximum rated line pull at the brake disc diameter, with the spring force selected to maintain this holding torque across the full spring working life of 200,000 engagement cycles — the crane inspection interval used by most major rental fleets.
Load Holding Under Power Failure
ASME B30.5 Section 5-1.9.2 requires that the hoist brake automatically engage and hold the load whenever the operator releases the hoist control, whenever control power is lost, and whenever the crane engine or electric drive shuts down. The SAHR brake in Korea Ever-Power mobile crane gearboxes satisfies this requirement through the spring-applied design — the brake is always engaged unless an active hydraulic or electrical signal holds it open. Any power loss immediately releases the brake control signal and the springs close the brake within the specified response time.
Design Factor 2.0 on Structural Components
EN 13000 specifies a minimum design factor of 2.0 on the yield strength of structural components (gears, shafts, carriers) at the rated working load. Korea Ever-Power truck crane hoist gearboxes verify this design factor through FEA of each critical component at the maximum rated single-line pull, with the calculated maximum stress compared to the 0.2% proof stress of the material (not ultimate tensile strength) — a more conservative basis that provides additional margin for the dynamic load variations that real crane lifts generate.
Duty Classification M3 to M5
ISO 4301 defines crane duty classifications from M1 (light, infrequent) to M8 (heavy, continuous). Truck-mounted cranes in construction and industrial service typically fall in classifications M3 to M5, depending on the lifting frequency and average load ratio. Korea Ever-Power truck crane gearbox gear tooth fatigue life calculations are performed at the M4 duty classification as the standard specification, with M5 available for cranes used in high-frequency rental service. The gear fatigue life at M4 corresponds to approximately 3.2 million load cycles over the crane design life of 10 to 20 years.
Korea Ever-Power Mobile Crane Hoist Drive Selection Guide
| Модел | Излазни обртни момент | Фазе | Распон односа | Crane Application | Duty Class | Brake Config |
|---|---|---|---|---|---|---|
| ZR75 | 1,500 – 6,000 Nm | 2–5 | 5.1 – 4,884 | RT crane 25–50 t, auxiliary hoist | M3–M4 | Single SAHR |
| 407AW | 3,000 – 10,000 Nm | 2–3 | 50 – 1,200 | AT crane 100 t main hoist | M4 | Single / Dual SAHR |
| 414W3 | 8,000 – 22,000 Nm | 3 | 100 – 2,500 | AT crane 200–300 t main hoist | M4–M5 | Dual SAHR |
| 417W3 | 15,000 – 35,000 Nm | 3 | 100 – 2,500 | AT crane 400–600 t main hoist | M4–M5 | Dual SAHR |
| 419W3 | 25,000 – 50,000 Nm | 3–4 | 200 – 5,000 | AT crane 600–1,000 t main hoist | M4–M5 | Dual SAHR |
Dynamic Lifting: Load Spectrum, Dynamic Factor, and Gearbox Fatigue Life
Hydraulic and Electric Drive Integration for Mobile Crane Hoists
Hydraulic Drive (Standard for Diesel-Powered Mobile Cranes): The vast majority of truck-mounted and all-terrain cranes use hydraulic hoist drives — the crane engine drives a variable-displacement pump that feeds piston motors on the hoist winch gearbox input. Variable-displacement motor control provides proportional speed control from creep to full hoisting speed. Load-sensing circuits maintain the motor pressure proportional to the load, providing inherent overload protection and smooth speed control across the full load range. Korea Ever-Power crane hoist gearboxes are available with SAE B, C, and D flange inputs for all hydraulic motor sizes used in the mobile crane market, with case drain isolation as standard to prevent cross-contamination of hydraulic and gear oil circuits.
Electric Drive (Growing on Hybrid and Electric Cranes): Hybrid and fully electric mobile cranes — driven by battery packs or grid connection at urban construction sites — use electric hoist motors rather than hydraulic. The electric drive eliminates hydraulic oil fire risk on critical lifts and provides precise speed control at all load levels. Korea Ever-Power crane gearboxes for electric drive cranes include IEC B5 flanges in frames IEC 160 to IEC 315 for the high-torque servo and induction motors used in crane hoist service, with regenerative braking compatibility — the gearbox transmits equal torque in hoisting and lowering directions without de-rating, enabling energy recovery during lowering of heavy loads.
Free-Fall Hoist Provision: Some crane operations — particularly clamshell bucket earthmoving and demolition work — require free-fall hoisting, where the drum is released to spin freely under gravity rather than being driven by the motor. Free-fall operation requires the gearbox to disconnect from the motor while the drum rotates freely, then re-engage smoothly as the brake is applied and the motor reconnects. Korea Ever-Power crane hoist gearboxes for free-fall operation include a wet clutch disengagement provision on the input side of the first planetary stage, enabling smooth free-fall engagement and controlled re-engagement as specified by the crane control system.
Testing, Certification, and Crane Manufacturer Approval
Common Mobile Crane Hoist Gearbox Failures and Prevention
| Режим квара | Основни узрок | Detection | Prevention |
|---|---|---|---|
| Brake spring fatigue — holding failure | High-cycle brake use in rental fleet service — spring preload loss after 200,000 engagement cycles without inspection | Load movement under static hold with motor de-energised; brake holding test failure at annual crane inspection | Replace spring pack at 200,000 cycles or 5-year interval; annual brake holding test at 1.5x rated load |
| Gear tooth fatigue — overloaded picks | Repeated operation above rated line pull — overloaded hooks or suspended load heavier than documented | Gear noise increase after campaign of heavy lifts; micro-pitting visible at tooth flank on annual inspection | Fit rated load limiter on crane control system; enforce slinging weight recording before any lift |
| Water ingress — outdoor storage | Thermal cycling during outdoor overnight storage drawing moisture through breather — condensation corrosion on gear and bearing surfaces | Rust-stained oil at drain plug; elevated iron in annual oil sample | Fit marine-grade desiccant breather; annual oil change and gear surface inspection at crane recertification |
| Planet bearing seizure — cold start | Mineral oil at -30°C too viscous to circulate to planet bearings within first 2 minutes of morning operation | Bearing noise after winter campaigns; metallic debris at drain plug inspection | Specify PAO synthetic oil pour point below -45°C for cranes operating below -20°C; 3-minute no-load warm-up before first lift |
| Housing paint corrosion — coastal sites | Standard industrial paint without marine-grade zinc primer — substrate corrosion progressing to housing wall thinning at bolt bosses | Visible rust at housing ribs; bolt boss corrosion reducing thread engagement depth at inspection | Specify C5-M three-coat paint system for cranes used within 10 km of coast; annual touch-up of any paint damage before rust initiation |
Why Mobile Crane Manufacturers and Rental Fleets Choose Korea Ever-Power
Source Your Truck-Mounted Crane Winch Drive Planetary Gearbox
Whether you are specifying hoist gearboxes for a new crane build programme, sourcing replacement units for a rental fleet recertification, or upgrading existing crane hoists to current EN 13000 or ASME B30.5 requirements — Korea Ever-Power delivers design-factor-verified, EN-compliant planetary winch drive gearboxes with the crane manufacturer documentation package. Send us your rated capacity, maximum line pull, duty classification, and drive type for a free EN 13000 compliance review and gearbox proposal within 48 hours.
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