{"id":1601,"date":"2026-07-15T03:49:57","date_gmt":"2026-07-15T03:49:57","guid":{"rendered":"https:\/\/gearrack.top\/product\/internal-gears-for-tractors-and-cranes-mild-steel-moq10\/"},"modified":"2026-07-15T03:50:14","modified_gmt":"2026-07-15T03:50:14","slug":"internal-gears-for-tractors-and-cranes-mild-steel-moq10","status":"publish","type":"product","link":"https:\/\/gearrack.top\/fr\/product\/internal-gears-for-tractors-and-cranes-mild-steel-moq10\/","title":{"rendered":"Engrenages internes pour tracteurs et grues \u2013 Acier doux, MOQ10"},"content":{"rendered":"
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<\/p>\n

Product Overview<\/h2>\n
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\n \"Internal\n <\/div>\n
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Korea Ever-Power’s internal gears for tractors and cranes<\/strong> are premium-quality mild steel ring gears engineered for the two most demanding heavy-duty applications of internal ring gears: agricultural tractor final drives and crane hoisting planetary gearboxes. Both applications share the same fundamental requirement \u2014 a ring gear that can carry very high torque reliably over a long service life with infrequent maintenance access. Tractors work in dusty, wet, and vibrating field environments; cranes cycle repeatedly at rated load capacity. In both cases, the ring gear’s tooth hardness, material integrity, and dimensional accuracy are the primary determinants of the drive’s safe working life.<\/p>\n

Korea Ever-Power is a factory \u2014 not a trading company \u2014 manufacturing internal gears for tractors and cranes<\/a> with sincerity and hard work since 2007. MOQ 10 pieces. On-time delivery; production capacity available at any time. Box packing. Samples available. Quotation requires drawing (IGS, DWG, STEP, PDF) \u2014 design assistance provided if no drawing is available.<\/p>\n<\/p><\/div>\n<\/div>\n

Tractor wheel hub final drives and crane hoisting gearboxes are both planetary systems where the ring gear is the fixed element \u2014 held in the housing while the planet carrier rotates to drive the output shaft. In a tractor hub planetary final drive, the ring gear bolt-flanges directly to the axle housing; in a crane hoist planetary gearbox, the ring gear is the housing bore. In both cases, the ring gear simultaneously carries the full output torque of the planetary stage and provides the structural interface to the machine’s frame \u2014 making it one of the most mechanically critical components in the entire drivetrain.<\/p>\n

<\/p>\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Internal Gears for Tractors and Cranes \u2014 Product Specification<\/th>\n<\/tr>\n<\/thead>\n
Product Type<\/strong><\/td>\nGear parts \u2014 internal ring gear<\/td>\n<\/tr>\n
Application<\/strong><\/td>\nTractor and crane \u2014 and other heavy machinery planetary drives<\/td>\n<\/tr>\n
Mat\u00e9riel<\/strong><\/td>\nMild steel (standard) \u2014 customised grades available per drawing<\/td>\n<\/tr>\n
Shape<\/strong><\/td>\nRound \u2014 customisable profile, flange, and mounting features per drawing<\/td>\n<\/tr>\n
Packaging Type<\/strong><\/td>\nBox<\/td>\n<\/tr>\n
MOQ<\/strong><\/td>\n10 pieces<\/td>\n<\/tr>\n
Delivery Time<\/strong><\/td>\n14\u201330 days; on-time delivery guaranteed<\/td>\n<\/tr>\n
Production Capacity<\/strong><\/td>\nAvailable at any time \u2014 30 sets CNC, 15 sets CNC turning, 10 sets sheet metal fabrication in-house<\/td>\n<\/tr>\n
Drawing Formats<\/strong><\/td>\nIGS, DWG, STEP, PDF \u2014 design assistance if no drawing<\/td>\n<\/tr>\n
\u00c9chantillons<\/strong><\/td>\nAvailable at extra charge<\/td>\n<\/tr>\n
Shipping<\/strong><\/td>\nTNT, FedEx, UPS (small qty) \u2014 air or sea (large qty)<\/td>\n<\/tr>\n
Payment<\/strong><\/td>\n50% T\/T in advance; balance before shipment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Tractor Hub Planetary Final Drive \u2014 Ring Gear Role<\/h2>\n

\"types<\/p>\n

The tractor’s wheel hub planetary final drive is the last reduction stage between the differential and the driven wheel. It is a single-stage planetary system with the ring gear fixed to the axle housing and the planet carrier bolted to the wheel hub. The final drive ratio is typically 4:1 to 6:1 \u2014 multiplying the axle shaft torque (already reduced by the transmission and differential) by a further 4\u20136\u00d7, producing the very high wheel torque that allows the tractor to work at low ground speed against heavy draught loads.<\/p>\n

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Full Output Torque Load<\/h3>\n

The ring gear in the tractor hub planetary carries the full wheel torque reaction \u2014 the torque that is trying to rotate the ring gear against the axle housing flange. At 5:1 final drive ratio, a 500 Nm axle shaft torque produces 2,500 Nm of reaction torque at the ring gear flange. This is the highest torque point in the entire tractor drivetrain, which is why the ring gear’s tooth surface hardness, material grade, and flange bolt pattern are all critical to the hub’s safe working life.<\/p>\n<\/p><\/div>\n

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Shock Load Resistance<\/h3>\n

Agricultural field operation subjects the tractor hub ring gear to shock loads every time the wheel hits a rock, rut, or soil discontinuity. These shock events produce instantaneous torque spikes several times the rated torque \u2014 the ring gear’s tooth core toughness (resistance to tooth fracture under impact) is the critical property for this duty. Korea Ever-Power’s heat treatment process controls not just the tooth surface hardness but also the core hardness and toughness, to withstand the field shock loading that agricultural ring gears must survive.<\/p>\n<\/p><\/div>\n

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Wet Environment Sealing<\/h3>\n

The tractor hub runs in oil \u2014 the hub ring gear is submerged in gear oil within the sealed hub housing. The ring gear’s surface condition inside the oil environment determines the oil’s contamination rate: a poorly finished ring gear sheds metallic particles into the oil, accelerating bearing and planet gear wear. Korea Ever-Power’s finished ring gears have controlled surface roughness on the bore and tooth flanks, minimising particle generation in the hub oil throughout the service interval.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Crane Hoisting Planetary Gearbox \u2014 Ring Gear Role<\/h2>\n

\"types<\/p>\n

The crane hoisting gearbox is a multi-stage planetary reducer between the electric hoist motor and the wire rope drum. A typical crane hoist gearbox uses two or three planetary stages to achieve a total ratio of 20:1 to 100:1 \u2014 reducing the motor speed from 1,000\u20131,500 rpm to 10\u201375 rpm at the drum, while multiplying the motor torque by 20\u2013100\u00d7. The ring gear in each planetary stage is the fixed element, bolted or pressed into the gearbox housing. In the final (output) stage, the ring gear carries the full hoisting torque \u2014 which, for a 10-tonne crane with a 100:1 ratio and a drum radius of 0.2 m, is 200,000 Nm.<\/p>\n

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Rated Load Every Cycle<\/h3>\n

Unlike a tractor where the maximum torque is reached occasionally under heavy draught, a crane’s ring gear may experience near-rated load on every single lift cycle. Over a 20-year service life at 50 lifts per day, a crane hoist ring gear may accumulate 350,000 full-load cycles \u2014 a very high cycle count that demands the maximum achievable tooth fatigue life from the ring gear material and surface treatment specification.<\/p>\n<\/p><\/div>\n

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Safety-Critical Classification<\/h3>\n

Crane hoisting gearboxes are safety-critical components under FEM (European Materials Handling Federation) and ISO 4301 crane classification standards. The ring gear is the most structurally loaded element in the hoist \u2014 any ring gear tooth fracture during a loaded lift results in dropped load, which is a life safety event. This safety-critical classification drives the material, heat treatment, and inspection requirements for crane planetary ring gears that Korea Ever-Power’s quality process addresses.<\/p>\n<\/p><\/div>\n

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Dimensional Accuracy for Tight Housing Fit<\/h3>\n

Crane planetary ring gears are typically interference-fitted or close-clearance fitted into the gearbox housing bore. The ring gear’s OD tolerance, roundness, and cylindricity must be controlled tightly to ensure the housing bore retains the ring gear against the full reaction torque without slipping. Korea Ever-Power’s CNC turning of the ring gear OD and face to close tolerance is confirmed by CMM measurement before the gear is accepted for gear tooth cutting.<\/p>\n<\/p><\/div>\n<\/div>\n

\"measuring<\/p>\n

<\/p>\n

Why Choose Korea Ever-Power<\/h2>\n

\"Ever-Power<\/p>\n

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We Are a Factory<\/h3>\n

Korea Ever-Power is a factory \u2014 all production steps for tractor and crane internal ring gears are handled in one location. CNC gear shaping, CNC turning of OD and bore, heat treatment, and quality inspection are all in-house. No sub-contracting means no quality handoff risk and no communication delays between production steps. The factory’s equipment \u2014 30 sets CNC, 15 sets CNC turning, 10 sets sheet metal fabrication \u2014 provides the capacity for both prototype samples and production batches at any time.<\/p>\n<\/p><\/div>\n

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On-Time Delivery<\/h3>\n

Korea Ever-Power guarantees on-time delivery for tractor and crane internal gears. The computerised production management system logs every step from order receipt through shipment \u2014 delivery date commitments are tracked against actual production progress. Customers can follow every step in real time. If a delay risk is identified during production, Korea Ever-Power notifies the customer immediately \u2014 not at the scheduled delivery date when it is too late to act.<\/p>\n<\/p><\/div>\n

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Production Capacity Available Any Time<\/h3>\n

Korea Ever-Power’s production capacity is available at any time for tractor and crane ring gear orders. There is no minimum booking lead time for the production facility. Orders placed today are scheduled immediately \u2014 the 14\u201330 day delivery window reflects the actual machining, heat treatment, and quality inspection time, not a queue wait. This production flexibility is important for agricultural customers who need gears for seasonal field maintenance windows.<\/p>\n<\/p><\/div>\n

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CNC Machining Since 2007<\/h3>\n

Korea Ever-Power has focused on CNC machining since 2007 \u2014 18+ years of accumulated experience in precision internal gear production. This experience covers the specific challenges of large-diameter internal gear shaping (chip clearance, cutter deflection, fixturing for uniform tooth depth), heat treatment of large ring gear blanks (distortion control, case depth uniformity), and post-heat-treatment correction of ring gear bore distortion \u2014 all critical for tractor hub and crane hoist ring gears.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Applications<\/h2>\n

\"Ever-Power<\/p>\n

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<\/div>\n

Tractor Wheel Hub Final Drive<\/h3>\n

Internal ring gears for the planetary final drive in tractor rear axle hub assemblies. Mild steel with induction hardening \u2014 standard for compact utility to large row-crop tractors. Customisable bolt-flange configuration, bore diameter, and face width per tractor make and model. MOQ 10 suits parts distributor stocking requirements.<\/p>\n<\/p><\/div>\n

\n
\ufe0f<\/div>\n

Crane Hoist Planetary Gearbox<\/h3>\n

Internal ring gears for multi-stage planetary hoist gearboxes on overhead travelling cranes, jib cranes, and port cranes. OD tolerance controlled for interference or close-clearance fit in the gearbox housing. Full material certificate and dimensional inspection report available for crane safety file documentation.<\/p>\n<\/p><\/div>\n

\n
\u2693<\/div>\n

Winch and Windlass Drives<\/h3>\n

Internal ring gears for marine winch planetary gearboxes and anchor windlass planetary stages. The customisable material option (mild steel standard; alloy steel or stainless for marine environments) suits the range of corrosion requirements from inland crane gearboxes to offshore vessel winch drives.<\/p>\n<\/p><\/div>\n

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<\/div>\n

Agricultural Machinery<\/h3>\n

Internal ring gears for combine harvester planetary main drives, self-propelled sprayer wheel motor planetary stages, and baler drive planetary gearboxes. Agricultural machinery shares the tractor’s demanding duty profile \u2014 high shock loads, seasonal use, and field maintenance \u2014 requiring the same premium internal ring gear specification.<\/p>\n<\/p><\/div>\n

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<\/div>\n

Industrial Lifting Equipment<\/h3>\n

Internal ring gears for industrial hoist planetary gearboxes in workshop hoists, construction material lifts, and maintenance platform drives. The tractor\/crane specification covers a range of lifting applications where the ring gear duty is similar to the crane hoist \u2014 repeated lifting cycles at significant load fractions.<\/p>\n<\/p><\/div>\n

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<\/div>\n

OEM and Aftermarket Replacement<\/h3>\n

OEM production and aftermarket replacement internal ring gears for major tractor and crane gearbox brands. Korea Ever-Power produces from the customer’s drawing with the customer’s part number marking. Delivery time 14\u201330 days from drawing confirmation; MOQ 10 pieces suits both OEM programme minimums and distributor aftermarket stocking levels.<\/p>\n<\/p><\/div>\n<\/div>\n

<\/p>\n

Frequently Asked Questions<\/h2>\n
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How do I get a quotation for a tractor or crane internal ring gear?<\/p>\n

Send the drawing in IGS, DWG, STEP, or PDF format, together with a detailed PDF if available. Specify the material requirement, surface treatment, accuracy grade, and quantity. Korea Ever-Power will provide professional advice on material selection and heat treatment specification for the specific tractor or crane application if required. If no drawing is available, Korea Ever-Power will send a sample drawing for reference or design the ring gear from the application requirements \u2014 OD, bore, module, tooth count, face width, and mounting interface.<\/p>\n<\/div>\n

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What is the delivery time and how is it guaranteed?<\/p>\n

Standard delivery time is 14\u201330 days from drawing confirmation and order placement. On-time delivery is guaranteed \u2014 Korea Ever-Power’s computerised production system logs every step and tracks delivery date commitments. If a delay risk is identified during production, the customer is notified immediately so they can adjust their maintenance or construction schedule. For urgent requirements (pre-harvest tractor maintenance, crane inspection deadline), contact Korea Ever-Power with the required date and we will confirm if an accelerated schedule is possible.<\/p>\n<\/div>\n

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What payment terms apply to tractor and crane ring gear orders?<\/p>\n

Standard payment terms are 50% T\/T in advance and the balance (50%) before shipment. The advance payment covers material procurement; the balance is due after production is confirmed complete and the goods pass final inspection. For established regular customers with a track record of orders, extended payment terms may be available \u2014 contact Korea Ever-Power to discuss. Wire transfer is the standard method; other arrangements can be discussed on enquiry.<\/p>\n<\/div>\n

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What shipping method is used for tractor and crane ring gears?<\/p>\n

For small quantities (MOQ 10 pieces, which typically weighs under 50 kg), Korea Ever-Power uses TNT, FedEx, or UPS express courier \u2014 fast, trackable, and the most practical for small to medium batches. For large quantities where the weight exceeds the economical limit for express freight, air cargo or sea freight is available and will be quoted at the order stage. Korea Ever-Power packs tractor and crane ring gears in export-standard boxes with appropriate cushioning for the gear’s weight and surface quality protection. Contact our team<\/a> for a freight quote to your destination.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Customer Reviews<\/h2>\n
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\n

“We are a tractor parts distributor and stock Korea Ever-Power’s internal ring gears for tractor hub final drives. MOQ 10 matches our minimum stocking order perfectly. Delivery within 18 days across three reorder cycles \u2014 consistently within the 14\u201330 day window. The computerised production tracking means we can give our workshop customers a reliable parts ETA, which we couldn’t do with our previous supplier.”<\/p>\n

Kim Bong-cheol<\/strong>  |  Agricultural Parts Distribution Manager, Incheon Farm Equipment Parts Co.  ·  Q1 2026<\/em><\/p>\n<\/div>\n

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“We rebuild crane hoisting gearboxes and source internal ring gears for cranes<\/a> from Korea Ever-Power. The OD tolerance on the ring gear confirmed on our incoming CMM measurement \u2014 within the H7 fit tolerance for interference fit in our gearbox housing. Material certificate included with delivery for our crane safety file. FedEx delivery to Busan in 3 days from shipment notice.”<\/p>\n

Lee Hyung-jun<\/strong>  |  Crane Gearbox Overhaul Engineer, Gyeonggi Crane Service Co.  ·  Q4 2025<\/em><\/p>\n<\/div>\n

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“We supply tractor hub assemblies to OEM assembly lines. No drawing for our hub ring gear \u2014 Korea Ever-Power provided a reference sample drawing for approval, incorporated our modifications, and produced the first batch in 22 days from drawing sign-off. 50% advance payment process was smooth. All ring gears passed our incoming gauge check and hub assembly fit verification.”<\/p>\n

Park Dong-cheol<\/strong>  |  Tractor Hub Assembly Engineer, Busan Agricultural Equipment Co.  ·  Q2 2026<\/em><\/p>\n<\/div>\n

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“We import tractor and crane ring gears for distribution in Australia. Sea freight from Hangzhou to Melbourne: 22 days. Korea Ever-Power’s production capacity ‘available at any time’ claim proved accurate \u2014 we placed an urgent pre-harvest order outside our normal schedule and Korea Ever-Power accommodated it within the standard 14\u201330 day window. No delay, no premium charge.”<\/p>\n

Choi Hyeon-woo<\/strong>  |  Heavy Equipment Parts Import Manager, Daejeon Pacific Supply Co.  ·  Q3 2025<\/em><\/p>\n<\/div>\n

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“We needed internal ring gears for a new 20-tonne crane hoist design \u2014 no existing drawing. Korea Ever-Power’s design team proposed the module, tooth count combination, and material specification from our torque and speed requirements, produced the drawing, and confirmed the interference condition check. Sample in 20 days. Hoist gearbox passed rated load test without issue. Production order placed.”<\/p>\n

Yoon Cheol-soo<\/strong>  |  Crane Design Engineer, Ulsan Industrial Crane Systems Co.  ·  Q1 2025<\/em><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Related Products<\/h2>\n
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\n \"Flywheel
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Ring Gears<\/h3>\n

Full ring gear range including flywheel ring gears for agricultural tractors, planetary ring gears, industrial internal gears, and more \u2014 all tractor and crane related specifications.<\/p>\n

Browse Ring Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

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Helical Gears<\/h3>\n

Industrial helical gears for parallel shaft drives in tractor transmission and crane auxiliary drives \u2014 the external gear complement to tractor and crane internal ring gear planetary assemblies.<\/p>\n

Browse Helical Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

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\n \"Engrenages
\n <\/a><\/p>\n
\n

Engrenages coniques<\/h3>\n

Forged bevel gears for right-angle drives in tractor differentials, crane swing mechanisms, and agricultural equipment direction-change drives \u2014 intersecting-shaft complement to internal ring gear planetary stages.<\/p>\n

Browse Bevel Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n

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\n \"Engrenages
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Spur Gears<\/h3>\n

Tractor spur gears for gearbox and PTO drive stages \u2014 the external sun and planet gear complement to tractor hub planetary internal ring gear assemblies.<\/p>\n

Browse Spur Gears \u2192<\/a>\n <\/div>\n<\/p><\/div>\n<\/div>\n

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Request a Quotation for Tractor and Crane Internal Gears<\/h3>\n

Mild steel, custom specifications, MOQ 10. Send drawing (IGS\/DWG\/STEP\/PDF) or specify application, OD, bore, module, tooth count, and quantity. On-time delivery. 14\u201330 days. 50% T\/T advance. TNT\/FedEx\/UPS or air\/sea.<\/p>\n

Get a Quote Now<\/a>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power internal gears for tractors and cranes are mild steel ring gears for heavy-duty agricultural and lifting machinery \u2014 round, customisable, box packing. MOQ 10 pieces. On-time delivery; production capacity available at any time. Shipping: TNT, FedEx, UPS (small qty); air or sea (large qty). Payment: 50% T\/T advance, balance before shipment. Samples at extra charge. Drawing formats: IGS, DWG, STEP, PDF. Delivery 14\u201330 days.<\/p>","protected":false},"featured_media":1602,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[4560],"product_tag":[],"class_list":["post-1601","product","type-product","status-publish","has-post-thumbnail","product_cat-ring-gear","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product\/1601","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/comments?post=1601"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/media\/1602"}],"wp:attachment":[{"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/media?parent=1601"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product_brand?post=1601"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product_cat?post=1601"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearrack.top\/fr\/wp-json\/wp\/v2\/product_tag?post=1601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}