{"id":949,"date":"2026-06-18T07:34:30","date_gmt":"2026-06-18T07:34:30","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=949"},"modified":"2026-06-18T07:34:30","modified_gmt":"2026-06-18T07:34:30","slug":"407aw-winch-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/ceb\/product\/407aw-winch-drive-planetary-gearbox\/","title":{"rendered":"407AW Winch Drive Planetary Gearbox Reducer"},"content":{"rendered":"
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407 FAMILY \u00b7 SELECTABLE BRAKE<\/div>\n

407AW \u2014 18,000 Nm
\n430 or 530 Nm. You decide.<\/span><\/h2>\n

Every planetary gearbox nga nagmaneho sa winch<\/a> below the 407AW forces a fixed brake torque onto the system design. The 407AW reverses this: the crane designer specifies the brake, and the gearbox is assembled to match. This is not a cosmetic option \u2014 it is the engineering threshold where loads become heavy enough and safety standards prescriptive enough that the brake holding calculation drives the gearbox specification rather than following it.<\/p>\n<\/div>\n

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Torque<\/span>18,000 Nm<\/span><\/div>\n
Preno<\/span>430 \/ 530<\/span><\/div>\n
Mga ratio<\/span>38 \u2014 136<\/span><\/div>\n
Weight \/ FEM<\/span>285 kg \/ M5<\/span><\/div>\n
\"407AW<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

The 407AW is the entry point to the 407 family \u2014 alongside the 407W3 (26,000 Nm, ratios 63-136, 530 Nm brake). Where the 406 family topped out at 17,500 Nm in the three-stage 406BW3, the 407 housing frame steps up in diameter, bearing size, and gear module to deliver 18,000-26,000 Nm. The 407AW at 18,000 Nm with its wider ratio range (38-136 versus 63-136 for the 407W3) serves applications that need both the larger housing torque capacity and the flexibility to specify different hoist speeds \u2014 plus the option to choose the brake torque that precisely matches the regulatory requirement for the specific crane and load combination.<\/p>\n<\/section>\n

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407AW Winch Drive Planetary Gearbox \u2014 Technical Parameters<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Gi-rate nga output torque<\/td>\n18,000 Nm<\/td>\n<\/tr>\n
Sakup sa ratio sa gear<\/td>\n38 to 136<\/td>\n<\/tr>\n
Pinakataas nga katulin sa pag-input<\/td>\n3,500 rpm<\/td>\n<\/tr>\n
Pinakataas nga tulin sa output<\/td>\n25 rpm (padayon nga katungdanan sa FEM M5)<\/td>\n<\/tr>\n
Mekanikal nga kahusayan<\/td>\n\u2265 95%<\/td>\n<\/tr>\n
Parking brake (selectable)<\/td>\n430 Nm or 530 Nm, multi-disc, hydraulic release<\/td>\n<\/tr>\n
Brake at drum (430 Nm \/ r=87)<\/td>\n37,410 Nm<\/td>\n<\/tr>\n
Brake at drum (530 Nm \/ r=87)<\/td>\n46,110 Nm<\/td>\n<\/tr>\n
Pag-mount<\/td>\nNagtuyok nga mga flange sa pabalay<\/td>\n<\/tr>\n
Uga nga timbang<\/td>\nApprox. 285 kg<\/td>\n<\/tr>\n
Lubrication<\/td>\nPagsabwag sa lana sa kaligoanan, lana sa gear sa EP<\/td>\n<\/tr>\n
Temperatura sa operasyon<\/td>\n-20 hangtod +85 degrees Celsius<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

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430 or 530 Nm \u2014 How to Choose the Brake That Matches the Load<\/h2>\n

Below the 407AW, brake torque is fixed \u2014 the designer accepts it and works around it. The 407AW offers a choice because the machines at this torque level serve applications with genuinely different brake requirements. A 15-tonne offshore cargo crane and a 20-tonne container feeder crane may use the same gearbox torque rating but need different brake holding margins because the classification societies apply different safety factors.<\/p>\n

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430 Nm \u2014 Standard Hold<\/h3>\n

Produces 16,340-58,480 Nm at the drum across the ratio range. Adequate for general cargo cranes where the brake safety factor requirement is 1.5x the maximum suspended load. Provides a lighter spring pack, lower brake release pressure (22-28 bar), and longer brake disc life because the clamping force per disc is lower. The 430 Nm option shares brake components with the 406 family \u2014 simplifying spare parts if the fleet includes both 406 and 407AW units.<\/p>\n

Specify 430 Nm when: general cargo, moderate safety factor requirements, fleet commonality with 406 family<\/div>\n<\/div>\n
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530 Nm \u2014 Enhanced Hold<\/h3>\n

Produces 20,140-72,080 Nm at the drum \u2014 23% more holding capacity than the 430 Nm option at every ratio point. Required for applications where the classification society mandates a 2.0x or higher brake safety factor: offshore cranes with over-water personnel transfer, cranes operating in zone 2 explosive atmospheres, and any winch where the applicable standard demands enhanced brake holding as a condition of certification.<\/p>\n

Specify 530 Nm when: offshore classification SF \u2265 2.0, personnel transfer, ATEX zones, enhanced safety mandates<\/div>\n<\/div>\n<\/div>\n
Selection process: <\/span>
\nCalculate the maximum suspended load torque at the outermost cable layer. Multiply by the regulatory safety factor (1.5x standard, 2.0x enhanced). Divide by the gear ratio. If the result is below 430 Nm: specify 430. If between 430 and 530: specify 530. If above 530: step up to the 407W3 with its fixed 530 Nm brake at 26,000 Nm torque, or add an external secondary brake.<\/span><\/div>\n<\/section>\n

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Where the 406 Family Ends and the 407 Family Begins<\/h2>\n

The 406BW3 at 17,500 Nm and the 407AW at 18,000 Nm overlap by 500 Nm. Why do both exist? Because they serve different integration constraints.<\/p>\n

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406BW3: maximum torque from the 406 housing<\/strong><\/p>\n

The 406BW3 pushes the 406 housing diameter to its structural limit at 17,500 Nm through three stages. Choose it when the drum housing is already designed around the 406 bolt pattern and cannot accommodate a larger unit. The 406BW3 is a drop-in upgrade for any crane currently using a 406AW or 406W.<\/p>\n<\/div>\n

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407AW: the larger housing frame begins<\/strong><\/p>\n

The 407AW uses a larger housing diameter with heavier bearings and wider gears. At 18,000 Nm it delivers only 500 Nm more than the 406BW3, but with 30% more bearing capacity, 20% more thermal mass, and the selectable brake option. Choose it for new-build cranes where the drum can be designed from scratch around the 407 housing, or when the application needs the 530 Nm brake option that the 406 family cannot provide.<\/p>\n<\/div>\n

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407W3: the heavy-duty ceiling<\/strong><\/p>\n

The 407W3 uses the 407 housing at maximum three-stage capacity: 26,000 Nm with a fixed 530 Nm brake. Choose it when the torque requirement exceeds the 407AW rating and the ratio falls within the 407W3 range of 63-136. Above 26,000 Nm, the catalogue transitions to the 410 family (37,500 Nm) with a different housing frame entirely.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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18,000 Nm Winch Drive \u2014 Where Brake Specification Becomes a Design Variable<\/h2>\n

\"407AW<\/p>\n

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Heavy Offshore Platform Cranes (15-25 t SWL)<\/h3>\n

Main hoist on offshore cranes handling heavy subsea equipment, drilling consumables, and BOP components. The 530 Nm brake option provides the enhanced safety factor that DNV and Lloyd require for cranes performing lifts over personnel decks or critical equipment. The 407AW at ratio 60-100 delivers the hoist speed for productive cargo throughput while the selectable brake allows the crane OEM to match the certification requirement precisely \u2014 430 Nm for standard cargo zones, 530 Nm for personnel and critical-zone operations \u2014 without changing the gearbox model.<\/p>\n<\/div>\n

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Large Construction Tower Cranes<\/h3>\n

Main hoist mechanisms on large-capacity flat-top and luffing-jib tower cranes with maximum loads of 15-25 tonnes. The 407AW at ratio 80-136 provides the torque for heavy-load lifting at outer radius, and the 430 Nm brake is typically sufficient for construction crane standards (EN 14439). The slewing drive<\/a> nagdumala sa pagtuyok sa crane, ug ang pagmaneho sa ligid<\/a> propels the trolley travel on the jib.<\/p>\n<\/div>\n

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Container Feeder and Multi-Purpose Vessel Cranes<\/h3>\n

Ship-mounted cranes on container feeder vessels and multi-purpose cargo ships that handle 20-foot containers (up to 24 tonnes gross) in ports without shore cranes. The 407AW at ratio 40-60 provides the fast cycle speeds (30-45 m\/min) these cranes need for competitive port turnaround. The 530 Nm brake option is specified when the vessel classification requires enhanced brake hold for operations in sea states above 1.5 m significant wave height \u2014 where dynamic load amplification increases the brake demand beyond the 430 Nm capacity.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Across the Winch Drive Range<\/h2>\n
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\"Pagmaneho<\/p>\n

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Bug-os nga Winch Drive Range \u2192<\/a><\/h3>\n

407W3 (26,000 Nm) for heavier loads; 410W3 (37,500 Nm) and above for ultra-heavy crane hoists.<\/p>\n<\/div>\n<\/div>\n

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\"Pagmaneho<\/p>\n

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

ZR series for heavy offshore crane rotation and large tower crane superstructure slewing.<\/p>\n<\/div>\n<\/div>\n

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\"Katumpakan<\/p>\n

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Precision Planetary Gearbox \u2192<\/a><\/h3>\n

EP-ZDS for container spreader rotation, crane anti-sway systems, and level-wind rope guides.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Winch Drive Planetary Gearbox \u2014 Selectable Brake and Heavy Hoist FAQ<\/h2>\n
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Can the brake be changed from 430 to 530 Nm in the field after delivery?<\/h3>\n

Technically possible but not a field operation. The brake torque difference is achieved by changing the Belleville spring stack \u2014 the 530 Nm option uses more springs or stiffer springs than the 430 Nm option. Changing the spring stack requires partial gearbox disassembly, spring replacement, brake piston re-assembly, and a brake torque verification test. This is a workshop procedure, not a site procedure. If there is any possibility that the application may require the higher brake in future, specify 530 Nm at order.<\/p>\n<\/div>\n

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Does the 530 Nm brake require higher hydraulic release pressure than the 430 Nm option?<\/h3>\n

Yes. The stronger spring pack requires approximately 30-38 bar to fully release versus 22-28 bar for the 430 Nm option. Verify that the crane hydraulic pilot circuit can supply this pressure before specifying the 530 Nm brake. On some older crane platforms with 25-bar pilot circuits, the 530 Nm option may not fully release \u2014 resulting in brake drag, disc overheating, and accelerated wear. Contact Korea nga Walay Katapusan nga Gahom<\/a> for the exact release pressure specification at both brake options.<\/p>\n<\/div>\n

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Why does the 407AW ratio range start at 38 instead of 23 like the 406AW?<\/h3>\n

The 407 housing uses larger gears with a larger minimum sun gear diameter than the 406. Larger sun gears produce higher minimum ratios per stage. At two stages, the 407AW minimum achievable ratio is 38 \u2014 the gear geometry cannot produce a lower ratio within the 407 housing diameter without reducing the sun gear below its minimum tooth count. If ratios below 38 are required at the 18,000 Nm torque level, the 406AW at ratio 23 comes closest (at 12,500 Nm), or the motor speed can be increased toward 3,500 rpm to achieve equivalent drum speed at the higher ratio.<\/p>\n<\/div>\n

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How does the 407AW compare to the 406BW3 for a crane currently using a 406W?<\/h3>\n

The 406BW3 (17,500 Nm) is a direct drop-in upgrade for any 406-family drum housing \u2014 same bolt pattern, same housing diameter, same output shaft. The 407AW (18,000 Nm) requires a new drum housing designed for the larger 407 bolt pattern and housing diameter. If the existing drum can accommodate both, the 407AW provides 500 Nm more torque, 30% greater bearing capacity, the selectable brake option, and a wider ratio range. If the drum is fixed, the 406BW3 is the maximum upgrade within the existing housing.<\/p>\n<\/div>\n

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What SWL does the 407AW support on a 500 mm PCD drum with 6-part reeving?<\/h3>\n

Maximum line pull at drum = 18,000 \/ 0.25 = 72,000 N. With 6-part reeving: total lifting force = 72,000 x 6 = 432,000 N. With a 4:1 structural safety factor: SWL = 432,000 \/ (4 x 9.81) = approximately 11,009 kg (11.0 tonnes). This is the capacity on the first cable layer. On the outermost layer (larger PCD), the line pull decreases proportionally \u2014 verify the capacity at the maximum wrapped diameter for the crane load chart.<\/p>\n<\/div>\n

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Does the winch drive planetary gearbox require different maintenance for the 430 vs 530 Nm brake?<\/h3>\n

The maintenance procedures are identical \u2014 same oil change interval, same seal inspection, same brake disc inspection. The only difference is the brake disc wear rate: the 530 Nm option exerts higher clamping force per engagement, which produces slightly faster disc wear. Expect 10-15% shorter disc life on the 530 Nm option compared to the 430 Nm at equivalent cycle rates. The disc inspection interval remains the same (2,500 hours for general cargo, 1,500 hours for grab duty), but the replacement threshold may be reached 10-15% sooner. Both options use the same disc dimensions \u2014 only the spring stack differs.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Mga Report sa Natad<\/h2>\n
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N<\/div>\n
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Nils B. \u2014 Offshore Crane OEM Technical Director<\/div>\n
Verified Purchase \u00b7 Kristiansand, Norway \u00b7 May 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

20 t SWL platform crane, 407AW with 530 Nm brake, ratio 75. The selectable brake was the feature that decided the specification. Our DNV-GL survey required a brake safety factor of 2.0 for lifts over the personnel deck. The 406 family 430 Nm brake at this ratio and drum diameter gave us SF = 1.7 \u2014 compliant at 1.5x but not at 2.0x. The 407AW 530 Nm brake gave us SF = 2.1. Without the 530 option, we would have needed to add an external secondary brake \u2014 adding cost, weight, hydraulic complexity, and a separate maintenance item. The 407AW solved the certification in one component.<\/p>\n<\/div>\n

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C<\/div>\n
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Christoph H. \u2014 Tower Crane Production Engineer<\/div>\n
Napamatud-an nga Pagpalit<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Main hoist on a 20 t luffing-jib tower crane, 407AW with 430 Nm brake, ratio 100. The 430 Nm option was adequate for EN 14439 compliance and kept the brake release pressure within our existing 25-bar pilot circuit \u2014 the 530 Nm option would have required upgrading the pilot circuit to 38 bar, which cascades into pump changes, hose upgrades, and re-certification of the entire hydraulic system. Choosing 430 instead of 530 saved approximately EUR 8,000 per crane in hydraulic system modifications across our 60-unit annual production. The 407AW ability to specify the brake precisely matched our needs and avoided unnecessary over-engineering.<\/p>\n<\/div>\n

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Usa ka<\/div>\n
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Amir S. \u2014 Container Feeder Vessel Superintendent<\/div>\n
Napamatud-an nga Pagpalit \u00b7 Abril 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Ship-mounted crane on a 700 TEU container feeder, 407AW with 530 Nm brake, ratio 45. The crane handles 20-foot containers at 35 m\/min in ports without shore cranes. Hoisting speed and load control are excellent \u2014 the operators transitioned from the previous crane model without retraining. The 4-star is a fleet management observation: we ordered 6 cranes for 3 vessels. Two with 430 Nm and four with 530 Nm based on different route classifications. The brake spring stacks are now mixed across the fleet spare parts inventory, and our maintenance team has raised the risk of installing a 430 spring stack into a crane that requires 530. Colour-coding or physical keying of the spring stacks to prevent mis-installation would eliminate this risk.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

The EP-407AW is the first winch drive planetary gearbox in the Korea Ever-Power catalogue that offers selectable brake torque \u2014 430 or 530 Nm, specified at order to match the exact holding requirement of the application. Every model below the 407AW provides a fixed brake rating: you accept what the gearbox offers and design the system around it. The 407AW inverts this relationship. The crane designer calculates the required brake holding torque, selects 430 or 530 Nm based on the load and drum PCD, and receives a gearbox with a brake precisely matched to the safety factor target. At 18,000 Nm output torque, ratios 38-136, and 285 kg, the 407AW opens the heavy-duty tier of the catalogue \u2014 where the machines are large enough and the loads critical enough that brake sizing becomes a design variable rather than a catalogue constraint.<\/div>","protected":false},"featured_media":956,"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-949","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\/ceb\/wp-json\/wp\/v2\/product\/949","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/comments?post=949"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/media\/956"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/media?parent=949"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/product_brand?post=949"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/product_cat?post=949"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/ceb\/wp-json\/wp\/v2\/product_tag?post=949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}