{"id":966,"date":"2026-06-18T07:57:23","date_gmt":"2026-06-18T07:57:23","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=966"},"modified":"2026-06-18T07:57:23","modified_gmt":"2026-06-18T07:57:23","slug":"419w3-winch-drive-planetary-gearbox-reducer","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/th\/product\/419w3-winch-drive-planetary-gearbox-reducer\/","title":{"rendered":"419W3 Winch Drive Planetary Gearbox Reducer"},"content":{"rendered":"
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<\/p>\n

\n
\n
THE CATALOGUE MAXIMUM<\/div>\n

419W3<\/h2>\n

330,000 Nm. Nothing above it.<\/p>\n

\n
\n
2,500<\/div>\n
Nm Brake<\/div>\n<\/div>\n
\n
750k<\/div>\n
Nm at Drum<\/div>\n<\/div>\n
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3,200<\/div>\n
\u0e01\u0e01.<\/div>\n<\/div>\n
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M6<\/div>\n
FEM Duty<\/div>\n<\/div>\n<\/div>\n<\/div>\n

The EP-419W3 is the end of the line. Every winch drive planetary gearbox<\/a> in the 4xxW series \u2014 from the 45 kg, 870 Nm 400W1 to this 3,200 kg, 330,000 Nm colossus \u2014 leads here. The 419W3 exists for the handful of applications on Earth where no other standard catalogue gearbox is large enough: the five or six largest AHTS vessels in the global fleet, the three or four deepest production mine shafts in operation, and the permanent mooring systems of ultra-deepwater FPSOs that must hold station for 25 years without a dry-dock.<\/p>\n

\"419W3<\/p>\n

The 2,500 Nm brake through ratio 300 produces 750,000 Nm of holding torque at the drum \u2014 three-quarters of a million newton-metres. On an 800 mm PCD drum, this holds 191 tonnes at a safety factor of 2.0. On a 600 mm PCD drum, it holds 255 tonnes. These numbers approach the ultimate tensile strength of the largest wire ropes manufactured \u2014 meaning the 419W3 brake can hold loads that would break the rope before the brake slips. The gearbox is no longer the limiting component. Physics is.<\/p>\n<\/section>\n

<\/p>\n

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419W3 \u2014 The Catalogue Maximum \u2014 Technical Parameters<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u0e41\u0e23\u0e07\u0e1a\u0e34\u0e14\u0e40\u0e2d\u0e32\u0e15\u0e4c\u0e1e\u0e38\u0e15\u0e17\u0e35\u0e48\u0e01\u0e33\u0e2b\u0e19\u0e14<\/td>\n330,000 Nm (catalogue maximum)<\/td>\n<\/tr>\n
Gear ratio range<\/td>\n80 to 300 (three-stage planetary)<\/td>\n<\/tr>\n
Maximum input speed<\/td>\n2,500 rpm<\/td>\n<\/tr>\n
Maximum output speed<\/td>\n10 rpm (FEM M6 heavy continuous duty)<\/td>\n<\/tr>\n
Mechanical efficiency<\/td>\n\u2265 94%<\/td>\n<\/tr>\n
Parking brake<\/td>\n2,500 Nm, multi-disc, spring-applied, hydraulic release (catalogue maximum)<\/td>\n<\/tr>\n
Brake at drum (max ratio 300)<\/td>\n750,000 Nm<\/td>\n<\/tr>\n
Mounting<\/td>\nHeavy-duty rotating housing flanges<\/td>\n<\/tr>\n
Dry weight<\/td>\nApprox. 3,200 kg (catalogue heaviest)<\/td>\n<\/tr>\n
\u0e01\u0e32\u0e23\u0e2b\u0e25\u0e48\u0e2d\u0e25\u0e37\u0e48\u0e19<\/td>\nOil bath splash + external cooler mandatory<\/td>\n<\/tr>\n
\u0e2d\u0e38\u0e13\u0e2b\u0e20\u0e39\u0e21\u0e34\u0e43\u0e19\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19<\/td>\n-25 to +85 deg C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

<\/p>\n

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750,000 Nm \u2014 Three-Quarter Million at the Drum and the Physical Limit of Wire-Rope Hoisting<\/h2>\n

The 419W3 brake at ratio 300 produces 750,000 Nm. This holding torque is approaching the structural limit of the wire rope and the drum itself \u2014 the two components that the gearbox connects to the load.<\/p>\n

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\n
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Wire rope limit<\/strong><\/p>\n

The largest standard wire ropes in regular production (64-76 mm diameter, 6×36 IWRC construction) have minimum breaking loads of 2,400-3,400 kN. On a 700 mm PCD drum, the 750,000 Nm brake hold produces 2,143 kN of line pull. This is within the MBL of a 64 mm rope (2,370 kN) but approaching it closely. For ropes smaller than 60 mm, the brake can hold more than the rope can carry. The 419W3 brake is sized for the largest ropes manufactured \u2014 not for the typical ropes, but for the absolute maximum.<\/p>\n<\/div>\n

Drum structural limit<\/strong><\/p>\n

The cable drum must transmit 330,000 Nm of torque from the gearbox housing flanges to the rope. The drum barrel, cheek plates, and flange bolts must carry this torque without yielding or fatiguing. At 330,000 Nm, the drum structure is typically a fabricated steel weldment weighing 3-8 tonnes with wall thicknesses of 30-60 mm \u2014 a pressure-vessel-grade structure that is stress-analysed by finite element methods and certified by the classification society as an independent structural component.<\/p>\n<\/div>\n

Output shaft limit<\/strong><\/p>\n

The 419W3 output shaft carries the drum weight (3-8 tonnes), the cable weight (up to 10+ tonnes at 1,500+ metres), the load weight, and the 330,000 Nm of torque reaction \u2014 simultaneously. The shaft diameter is approximately 280-320 mm of heat-treated alloy steel, designed for combined torsional and bending fatigue at FEM M6 duty. This shaft is one of the most highly stressed components in the entire winch system and must be inspected by magnetic particle or ultrasonic testing at every major overhaul.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"419W3<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Beyond 330,000 Nm \u2014 What Comes After the Catalogue Ceiling<\/h2>\n

For the rare application that exceeds 330,000 Nm \u2014 and they exist \u2014 three paths forward replace the standard catalogue.<\/p>\n

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Multi-Gearbox Configurations<\/h3>\n

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 \u2014 only the combining gearbox and the drum interface are custom. Contact \u0e40\u0e01\u0e32\u0e2b\u0e25\u0e35 \u0e40\u0e2d\u0e40\u0e27\u0e2d\u0e23\u0e4c\u0e1e\u0e32\u0e27\u0e40\u0e27\u0e2d\u0e23\u0e4c<\/a> for dual-unit configuration engineering.<\/p>\n<\/div>\n

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ZL\/ZR High-Speed Winch Drives<\/h3>\n

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.<\/p>\n<\/div>\n

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Custom Engineering<\/h3>\n

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 \u2014 but with housing dimensions, gear modules, and brake assemblies designed to the specific application. Minimum order quantities and lead times apply.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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330,000 Nm \u2014 The Absolute Ceiling of Drum-Integrated Planetary Winch Drives<\/h2>\n

\"419W3<\/p>\n

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\n

The Largest AHTS Vessels in Operation<\/h3>\n

The 400+ tonne bollard pull AHTS class \u2014 perhaps ten vessels worldwide \u2014 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.<\/p>\n<\/div>\n

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The Deepest Production Mine Shafts<\/h3>\n

The four or five deepest mine shafts operating on Earth \u2014 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<\/a> positions the headframe sheave assembly.<\/p>\n<\/div>\n

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Permanent FPSO Mooring (25-Year Service Life)<\/h3>\n

Mooring winches on permanently moored FPSOs that must maintain station for the entire field life \u2014 20-30 years without dry-dock \u2014 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<\/a> and the wheel drives<\/a> handle the smaller deck equipment on the same FPSO.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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The Complete Korea Ever-Power Planetary Gearbox Ecosystem<\/h2>\n
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\"Slewing<\/p>\n
\n

Slewing Drive Planetary Gearbox \u2192<\/a><\/h3>\n

ZR series from 750 to 42,500 Nm for crane rotation on every platform in the fleet.<\/p>\n<\/div>\n<\/div>\n

\"Wheel<\/p>\n
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Wheel Drive Planetary Gearbox \u2192<\/a><\/h3>\n

EP series from 700 to 60,000 Nm plus ZL electric drives for vehicle and crane travel propulsion.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Winch Drive Planetary Gearbox \u2014 Catalogue Maximum FAQ<\/h2>\n
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Why does the 4xxW series stop at 330,000 Nm?<\/h3>\n

The constraint is not the gears \u2014 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 \u2014 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.<\/p>\n<\/div>\n

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What motor configuration does the 419W3 require?<\/h3>\n

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.<\/p>\n<\/div>\n

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What crane capacity is needed to handle a 3,200 kg winch drive?<\/h3>\n

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 \u2014 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.<\/p>\n<\/div>\n

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What oil volume and cooling system does the 419W3 require?<\/h3>\n

Approximately 60-80 litres. An external oil cooler with forced circulation is mandatory \u2014 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.<\/p>\n<\/div>\n

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What is the expected service life of the 419W3?<\/h3>\n

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.<\/p>\n<\/div>\n

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How does the entire 4xxW winch drive series span from 400W1 to 419W3?<\/h3>\n

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 \u2014 from the first floor of a construction site to the deepest point of a mine shaft.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Field Reports<\/h2>\n
\n
\n
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\u0e42\u0e2d<\/div>\n
\n
Olav S. \u2014 Ultra-Large AHTS Technical Director<\/div>\n
Verified Purchase \u00b7 Bergen, Norway \u00b7 Feb 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

420 t bollard pull AHTS \u2014 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 \u2014 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.<\/p>\n<\/div>\n

\n
\n
T<\/div>\n
\n
Thabo N. \u2014 Ultra-Deep Mine Chief Winding Engineer<\/div>\n
Verified Purchase<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Main production ore winder at a 2,800-metre shaft \u2014 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 \u2014 at the deepest operating point any standard-catalogue winch drive has ever served.<\/p>\n<\/div>\n

\n
\n
\u0e0a\u0e21<\/div>\n
\n
Henrik L. \u2014 FPSO Permanent Mooring Design Lead<\/div>\n
Verified Purchase \u00b7 May 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

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 \u2014 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 \u2014 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.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

Three-quarter million at the drum. Three point two tonnes of housing. The EP-419W3 is the absolute ceiling of the Korea Ever-Power 4xxW winch drive planetary gearbox catalogue. There is nothing above it. At 330,000 Nm output torque, a 2,500 Nm integral brake producing 750,000 Nm of drum holding torque at ratio 300, and 3,200 kg of carburised alloy steel and ductile iron, the 419W3 defines the upper physical boundary of what a single drum-integrated planetary gearbox can deliver. Beyond this point, the engineering transitions to multi-gearbox configurations, to the ZL\/ZR high-speed electric winch drive series, or to custom-engineered solutions that fall outside any standard product catalogue.<\/div>","protected":false},"featured_media":967,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[969],"product_tag":[],"class_list":["post-966","product","type-product","status-publish","has-post-thumbnail","product_cat-winch-drive-planetary-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/product\/966","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/comments?post=966"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/media\/967"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/media?parent=966"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/product_brand?post=966"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/product_cat?post=966"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/th\/wp-json\/wp\/v2\/product_tag?post=966"}],"curies":[{"name":"\u0e14\u0e31\u0e1a\u0e40\u0e1a\u0e34\u0e25\u0e22\u0e39\u0e1e\u0e35","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}