419W3 Winch Drive Planetary Gearbox Reducer

Multi-Gearbox Configurations

Two 419W3 units driving one drum through a torque-combining gearbox, producing up to 660,000 Nm of drum torque. The combining gearbox synchronises the two input shafts and distributes the load evenly. This doubles the available torque within the catalogue product range without custom engineering of the planetary stages themselves — only the combining gearbox and the drum interface are custom. Contact Korea nga Walay Katapusan nga Gahom for dual-unit configuration engineering.

ZL/ZR High-Speed Winch Drives

The ZL winch drive series (27,000-175,000 Nm, 1-5 stages, up to 5,000 rpm input) and the ZR series (55,000-175,000 Nm, right-angle configuration) provide an alternative architecture optimised for high-speed electric motors rather than the low-speed hydraulic motors that the 4xxW series was designed around. For new-build applications transitioning to electric drive, the ZL/ZR series may provide the torque requirement through a different motor-gearbox combination.

Custom Engineering

For torque requirements exceeding 660,000 Nm (dual 419W3) or for applications with unique constraints (extreme temperatures, unusual mounting geometries, non-standard duty cycles), Korea Ever-Power provides custom planetary gearbox engineering. The custom programme uses the same carburised alloy steel gear technology, the same bearing suppliers, and the same manufacturing processes as the standard catalogue — but with housing dimensions, gear modules, and brake assemblies designed to the specific application. Minimum order quantities and lead times apply.

The Largest AHTS Vessels in Operation

The 400+ tonne bollard pull AHTS class — perhaps ten vessels worldwide — handling the anchor systems for ultra-deepwater platforms at water depths exceeding 2,500 metres. Individual anchor chain assemblies weigh 250-350 tonnes at these depths. The 419W3 at ratio 250-300 provides the drum torque, and the 2,500 Nm brake holds the full chain at maximum depth with safety factors that satisfy the most demanding classification societies without any supplementary braking requirement.

The Deepest Production Mine Shafts

The four or five deepest mine shafts operating on Earth — South African gold mines at 2,000-3,500 metres depth. The combined weight of the skip, ore, and 3,000+ metres of heavy-gauge rope reaches 150-200 tonnes at full depth. The 419W3 at ratio 280-300 provides the drum torque for production winding, and the 2,500 Nm brake holds the loaded skip at any point in the shaft. At these depths, the slewing drive positions the headframe sheave assembly.

Permanent FPSO Mooring (25-Year Service Life)

Mooring winches on permanently moored FPSOs that must maintain station for the entire field life — 20-30 years without dry-dock — in ultra-deepwater environments where each mooring leg carries 200-300 tonnes of line tension during extreme weather. The 419W3 FEM M6 duty rating and the 3,200 kg housing mass provide the thermal capacity and fatigue resistance for decades of continuous service. The auxiliary winch drives and the wheel drives handle the smaller deck equipment on the same FPSO.

Why does the 4xxW series stop at 330,000 Nm?

The constraint is not the gears — it is the housing. At 330,000 Nm, the housing casting has reached its maximum practical diameter for drum integration. Larger housings would not fit inside the cable drums of the machines the 419W3 serves. The gear technology could produce more torque in a larger housing, but the housing cannot grow larger without the drum growing proportionally — and the drum is constrained by the vessel stern structure or the mine headframe. The 330,000 Nm ceiling is an integration limit, not a gear strength limit.

What motor configuration does the 419W3 require?

At ratio 200, the motor input torque is 1,650 Nm. For electric drive: a single 1,200-1,800 kW AC motor with VFD is the most common configuration on new-build installations. For hydraulic drive: quad or quintuple axial piston motors through a multi-way combiner. Electric drive dominates at this tier because the power density, efficiency, and control sophistication of modern VFDs outperform the hydraulic equivalent. The hydraulic option remains relevant for vessels and mines with existing hydraulic infrastructure where the cost of electrical conversion would exceed the project budget.

What crane capacity is needed to handle a 3,200 kg winch drive?

Minimum 7,000 kg at the working radius. The 419W3 plus drum, cable, and motor assembly can total 15-25 tonnes. Installation and removal require a dedicated heavy-lift operation — either the vessel construction crane during building or dry-dock, or a dedicated overhead hoist permanently installed in the mine headframe winder house. The 419W3 cannot be manoeuvred manually under any circumstances. A purpose-built lifting frame, rigging plan, and lift study are mandatory for every installation and removal event.

What oil volume and cooling system does the 419W3 require?

Approximately 60-80 litres. An external oil cooler with forced circulation is mandatory — not recommended, mandatory. At 330,000 Nm and 10 rpm (346 kW throughput), the gearbox dissipates approximately 21 kW as heat at 94% efficiency. The oil-bath convection capacity of even the 3,200 kg housing cannot absorb 21 kW continuously without exceeding 85 deg C. Size the external cooler for 25 kW minimum (21 kW heat load + 20% safety margin) with a circulation pump rated at 10-15 L/min. Oil changes every 1,000 hours. Sampling every 500 hours.

What is the expected service life of the 419W3?

The FEM M6 design target is 2 million load cycles. At 300 cycles per day: approximately 18 years. At 500 cycles per day: approximately 11 years. With full maintenance compliance, the 419W3 gear set and housing are designed for 25,000-30,000 hours between overhauls. Brake disc replacement at 8,000-12,000 hours. Seal replacement at 8,000-10,000 hours. Bearing inspection at 15,000 hours. The output shaft should be inspected by NDT at every major overhaul. Overhaul cost: 30-40% of new unit price. Turnaround: 10-14 weeks from factory receipt.

How does the entire 4xxW winch drive series span from 400W1 to 419W3?

From the smallest to the largest: 870 Nm to 330,000 Nm (379:1 torque range). From 45 kg to 3,200 kg (71:1 weight range). From 130 Nm brake to 2,500 Nm brake (19:1 brake range). From 792 Nm drum hold to 750,000 Nm drum hold (947:1 holding torque range). From a personnel hoist lifting two people to a mining winder cycling 25-tonne ore skips through 3-kilometre shafts. One product family, one engineering philosophy, one supplier — from the first floor of a construction site to the deepest point of a mine shaft.

420 t bollard pull AHTS — the largest in our fleet. 419W3 at ratio 250, dual 1,200 kW AC motors. The vessel completed an anchor deployment for a semi-submersible at 2,400 metres in offshore Brazil — the deepest operation this vessel has performed. The combined chain and wire weight at full depth was approximately 310 tonnes. The 2,500 Nm brake held this load during a 9-hour weather standby while we waited for the sea state to subside for the final anchor setting. Zero chain counter drift across 9 hours. The 419W3 is the reason this vessel can operate at these depths without dual-winch or chain-locker ballast systems that our competitors require. One winch, one gearbox, one brake. Sufficient.

Main production ore winder at a 2,800-metre shaft — one of the three deepest operating mine shafts in the world. 419W3 at ratio 300, single 1,500 kW AC motor with VFD. The skip carries 18 tonnes of ore; the 64 mm rope at full depth weighs 12,800 kg. Total suspended load at the deepest point: 30,800 kg. Brake SF at drum = 750,000 / (30,800 x 9.81 x 0.4) = 6.2. The mine inspector commented that this is the highest brake safety factor he has certified on any production winder in his career. After 7 months of 3-shift winding at 280 cycles per day, all condition monitoring parameters are nominal. The 419W3 is performing as designed — at the deepest operating point any standard-catalogue winch drive has ever served.

Permanent mooring system on a turret-moored FPSO, 3,000-metre water depth, 16 mooring legs, one 419W3 per leg. The field life is 25 years. The 419W3 FEM M6 design life exceeds the field requirement with margin — the gears and bearings are rated for conditions more severe than mooring tension adjustment cycles. After 14 months of continuous station-keeping, all 16 units are performing identically. The 4-star is forward-looking: at 25-year field life, we will need to overhaul each 419W3 at least twice during the FPSO operational period. Each overhaul requires removing the 3,200 kg unit from the turret — a major marine operation. If Ever-Power could offer a condition-based monitoring package (vibration, oil quality, brake torque trending with remote data transmission) that extends the time between overhauls based on actual condition rather than fixed intervals, the total cost of ownership over 25 years could be reduced significantly.