{"id":1208,"date":"2026-06-26T06:01:07","date_gmt":"2026-06-26T06:01:07","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?p=1208"},"modified":"2026-06-26T06:01:07","modified_gmt":"2026-06-26T06:01:07","slug":"wheel-drive-planetary-gearbox-for-wheeled-excavators","status":"publish","type":"post","link":"https:\/\/planetary-gearboxes.com\/bs\/wheel-drive-planetary-gearbox-for-wheeled-excavators\/","title":{"rendered":"Planetarni mjenja\u010d s pogonom na kota\u010de za bagere na kota\u010dima"},"content":{"rendered":"
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\"Wheel<\/p>\n
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Korea Ever-Power \u00b7 Application Engineering \u00b7 Wheeled Excavators<\/p>\n

Planetarni mjenja\u010d s pogonom na kota\u010de za bagere na kota\u010dima<\/h1>\n

A wheeled excavator drives 20 km on the public highway at 37 km\/h, parks on a city street, lowers its outriggers, and excavates a utility trench 2 metres from a gas main. Then it raises the outriggers, drives 500 metres to the next dig point, and repeats \u2014 15 to 30 times per shift. The wheel drive must be a highway-legal axle and a precision jobsite positioning system in the same unit.<\/p>\n

Browse Wheel Drive Planetary Gearboxes \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Why Wheeled Excavators Exist \u2014 Road Mobility as the Primary Advantage<\/h2>\n

A tracked excavator must be transported to the jobsite on a low-loader \u2014 a process that takes 30 to 90 minutes per move and costs USD 200 to 800 per transport. A wheeled excavator drives itself to the jobsite on public roads at 20 to 40 km\/h \u2014 arriving in the same time as a truck, without a transport vehicle, without road permits, and without blocking traffic for loading and unloading. For urban utility work (gas, water, sewer, electricity, telecommunications), where the excavator moves between 5 to 30 dig points per day along a road corridor, the wheeled excavator saves 2 to 10 transport moves per day \u2014 USD 400 to 8,000 in daily transport costs.<\/p>\n

This road-mobility advantage places unique demands on the planetarni mjenja\u010d pogona na kota\u010de<\/a>. The drive must meet the same road-vehicle regulations as a truck (ECE R13 braking, noise limits, axle-weight limits, lighting and signalling) while also providing the low-speed precision needed to position a 20-tonne machine within 100 mm of a utility trench on a crowded city street. No other excavator type requires highway-legal compliance \u2014 and no other highway vehicle requires excavator-grade positioning precision.<\/p>\n

The wheeled excavator market is concentrated in Europe (where road regulations favour self-propelled machines over transported ones), Japan (where compact urban excavators dominate), and increasingly in North America and Australia for utility and road-maintenance applications. Machine weights range from 9 to 25 tonnes \u2014 with the 15 to 20-tonne class being the most common for urban utility work.<\/p>\n

The duty cycle is fundamentally different from a tracked excavator. A tracked excavator sits in one position and digs for hours \u2014 the undercarriage is loaded statically. A wheeled excavator moves between dig points 15 to 30 times per shift \u2014 spending 30 to 60% of its operating time driving and repositioning, and only 40 to 70% actually digging. The wheel drive therefore accumulates 800 to 1,500 driving hours per year \u2014 comparable to a delivery truck \u2014 while the digging mechanism accumulates 1,000 to 2,000 hours. The wheel drive is not an auxiliary system; it is a primary working component that is used as intensively as the digging arm.<\/p>\n

The superstructure slewing (360-degree upper-body rotation) adds a unique loading condition during road transfer. The excavator upper structure (cab, boom, engine) must be locked facing forward during road driving \u2014 because a side-facing upper structure shifts the vehicle CG laterally and changes the steering response. The slew lock must hold the upper structure against wind loads, road vibration, and cornering forces during highway transfer. If the slew lock fails during road driving, the upper structure rotates uncontrolled \u2014 shifting the CG and potentially causing the vehicle to veer or overturn. The wheel drive braking system must be capable of safely stopping the vehicle even with a laterally displaced CG from a slew-lock failure \u2014 an emergency scenario that the ECE R13 brake-system design must accommodate.<\/p>\n

The counterweight on a wheeled excavator (2 to 5 tonnes of steel at the rear of the upper structure) provides digging stability but shifts the overall vehicle CG rearward \u2014 producing a rear-heavy weight distribution of 55 to 65% on the rear axle during road transfer. This uneven distribution means the rear wheel drives carry more weight, generate more braking force, and experience more bearing fatigue per kilometre than the front drives \u2014 and must be specified for the heavier duty even though the front and rear gearboxes are often the same part number for inventory simplicity.<\/p>\n<\/section>\n

\"Wheel<\/p>\n

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Jobsite Repositioning \u2014 Precision Driving in Urban Spaces<\/h2>\n
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The wheeled excavator must position itself within 100 to 200 mm of the dig point \u2014 which may be next to a gas main, a water pipe, or a fibre-optic cable. The positioning accuracy on a city street is constrained by parked cars, kerbs, pedestrians, traffic signs, and overhead wires \u2014 all of which limit the available manoeuvring space to corridors as narrow as 3 to 4 metres.<\/p>\n

All-wheel steering (front and rear axles steer) reduces the turning circle by 30 to 40% compared to front-steer-only configurations \u2014 allowing the 8 to 10-metre-long machine to turn in spaces that would require a multi-point turn with conventional steering. Some models offer crab steering (all wheels in the same direction) for lateral positioning \u2014 moving the machine sideways toward the kerb without turning. The wheel drive must support all steering modes with smooth, proportional torque at the 1 to 3 km\/h positioning speed \u2014 because any torque pulsation or hesitation at this speed produces jerky movement that is difficult to control in tight urban spaces.<\/p>\n

The transition from driving to digging involves the outrigger deployment sequence. The operator drives to the dig point, lowers the blade (rear stabiliser) and outriggers (side supports), and transfers the machine weight from the tyres to the stabilisers. During this transition, the planetarni mjenja\u010d pogona na kota\u010de<\/a> parking brake must hold the machine stationary \u2014 even if the street has a cross-slope or longitudinal grade of 5 to 10%. Once the outriggers are fully loaded, the wheels are partially or fully unloaded \u2014 and the wheel drive is effectively idle during the digging phase. This means the wheel drive alternates between intense driving duty (repositioning) and complete rest (digging) \u2014 a duty pattern that produces thermal cycling similar to the wheel loader V-cycle but at a lower frequency (15 to 30 transitions per shift versus 400 on a loader).<\/p>\n

The urban operating environment also introduces unique hazards for the wheel drive. City streets contain drainage grates, manhole covers, kerb edges, and utility access covers that the wheels must drive over during repositioning. Each of these surface features produces a momentary impact load on the wheel drive output bearing \u2014 and the cumulative impact from 500 to 2,000 surface-feature crossings per day adds to the bearing fatigue budget. The wheel drive must be rated for this urban-surface impact duty \u2014 which is different from both the smooth-road highway duty and the soft-ground off-road duty. Urban-surface impacts are sharp (5 to 15 ms duration), moderate-amplitude (2 to 5 g), and high-frequency (10 to 50 per hour) \u2014 a fatigue profile that standard construction-equipment bearing-life calculations do not capture because they assume either continuous smooth loading (highway) or infrequent heavy impacts (off-road).<\/p>\n<\/div>\n

\"ZL01<\/div>\n<\/div>\n<\/section>\n
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Highway Transfer \u2014 A Construction Machine That Must Be a Road Vehicle<\/h2>\n
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The highway transfer requirement transforms the wheel drive from a construction-equipment component into an automotive component. The wheeled excavator must comply with the same road-vehicle regulations as a truck: ECE R13 braking (deceleration of 5.0 m\/s2 from maximum speed), ECE R51 noise limits (80 dBA pass-by at 7.5 metres), axle-weight limits (typically 10 to 13 tonnes per axle), and lighting\/signalling requirements. The wheel drive must provide the braking capacity, the gear-mesh noise quality, and the axle-load compatibility to satisfy these regulations \u2014 which are more stringent than any construction-site standard.<\/p>\n

The maximum road speed varies by market: 20 km\/h in some European countries (registration as a mobile machine), 37 km\/h in Germany (registration as a self-propelled work machine), and 40 to 50 km\/h in some markets with full vehicle registration. At 37 km\/h and 20 tonnes, the braking energy is approximately 2.1 MJ \u2014 significantly less than an all-terrain crane at 80 km\/h but still requiring automotive-grade disc brakes and a dual-circuit brake system with load-sensing proportioning.<\/p>\n

The gear-mesh noise at highway speed must comply with the 80 dBA pass-by limit. At 37 km\/h, the wheel drive output shaft rotates at 150 to 250 rpm (depending on the tyre size and gear ratio) \u2014 producing a gear-mesh frequency of 3,000 to 7,500 Hz (output RPM x number of teeth). At these frequencies, gear-mesh noise radiates efficiently through the housing \u2014 and DIN Class 6 gears are the minimum quality for noise compliance. Class 8 gears can produce pass-by noise levels of 82 to 85 dBA \u2014 exceeding the legal limit and preventing the machine from obtaining road registration. The noise requirement is particularly challenging because the wheeled excavator housing is typically more compact (less wall thickness for weight saving) and less acoustically optimised (construction priority, not automotive priority) than a truck axle housing \u2014 meaning the noise per unit of gear quality is inherently higher than on a purpose-designed automotive axle. The gearbox manufacturer must therefore collaborate with the excavator OEM on the housing acoustic design \u2014 optimising the rib pattern, wall thickness, and mounting isolation to achieve the pass-by noise target at the specified gear quality level.<\/p>\n<\/div>\n

\"605L2<\/div>\n<\/div>\n<\/section>\n
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Three Failure Modes Specific to Wheeled Excavator Drives<\/h2>\n
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1<\/div>\n
Road-noise regulatory failure from gear-mesh noise exceeding 80 dBA<\/div>\n<\/div>\n

A wheeled excavator that fails the ECE R51 pass-by noise test cannot be registered for road use \u2014 eliminating its primary competitive advantage over tracked excavators. Gear-mesh noise is the dominant contributor to pass-by noise at highway speed: the mesh frequency (3,000 to 7,500 Hz) falls in the frequency range where the human ear is most sensitive and where the noise meter weighting (A-weighting) provides the least attenuation. A 2 dBA reduction at the gear mesh (achieved by upgrading from Class 8 to Class 6) can mean the difference between passing and failing the type-approval test \u2014 and the cost of the gear-quality upgrade (15 to 25% of the gearbox price) is trivial compared to the consequence of losing road registration for the entire machine model.<\/p>\n

Prevention: DIN Class 6 minimum gear quality. Housing acoustic optimization (ribbing pattern, wall thickness). Noise testing at prototype stage before type-approval submission.<\/div>\n<\/div>\n
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2<\/div>\n
Parking brake creep on sloped city streets during outrigger deployment<\/div>\n<\/div>\n

City streets have cross-slopes of 2 to 4% (for drainage) and longitudinal grades of up to 10 to 15% on hilly terrain. During the 30 to 60-second outrigger deployment sequence, the parking brake must hold the 20-tonne machine stationary against the gravity component \u2014 approximately 10 to 30 kN depending on the slope. If the brake pad is worn below 60% of its original thickness, the holding torque may be insufficient for the steepest slopes \u2014 and the machine creeps slowly downhill during outrigger deployment. On a city street with parked cars, pedestrians, and utility trenches, a creeping excavator during stabiliser setup is a serious safety hazard that can result in property damage, injury, or regulatory sanctions (loss of operating permit).<\/p>\n

Prevention: Spring-applied failsafe brake (engages on power loss). Brake-wear indicator with automatic warning at 40% remaining pad. Annual brake holding-torque test at 15% slope per the machine type-approval requirements.<\/div>\n<\/div>\n
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3<\/div>\n
Bearing standstill corrosion from alternating drive and idle periods during digging<\/div>\n<\/div>\n

During the digging phase (40 to 70% of operating time), the wheel drive is stationary with the wheels partially or fully unloaded (outriggers carrying the machine weight). The output bearing sits motionless with a reduced or zero load \u2014 and any moisture that has entered the gearbox (through breathing, seal weepage, or condensation) settles on the bearing surfaces and initiates standstill corrosion. Unlike seasonal machines that experience standstill during storage, the wheeled excavator experiences 20 to 40 standstill periods per day \u2014 each lasting 10 to 30 minutes. Over 2,000 hours of digging per year, the cumulative standstill time reaches 1,000 to 1,500 hours \u2014 long enough for standstill corrosion to initiate micro-pitting on bearings that are not protected by corrosion-inhibiting oil additives. The intermittent nature of the loading (drive-stop-drive-stop) is particularly damaging because each restart grinds the corrosion products into the raceway surface before the oil film can fully re-establish.<\/p>\n

Prevention: Gear oil with standstill corrosion inhibitor (vapour-phase corrosion protection). Desiccant breather to minimise moisture ingress. Consider a brief wheel-drive engagement (10 seconds) at each startup to redistribute the oil film before driving.<\/div>\n<\/div>\n<\/div>\n<\/section>\n
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\u010cesto postavljana pitanja<\/h2>\n
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How does a wheeled excavator drive differ from a tracked excavator final drive?<\/h3>\n

Three fundamental differences: (1) the wheeled excavator drive must comply with road-vehicle regulations (ECE R13 braking, ECE R51 noise, axle-weight limits) that do not apply to tracked machines; (2) the drive alternates between highway transfer (20 to 40 km\/h, moderate torque) and jobsite positioning (1 to 3 km\/h, low torque) \u2014 a dual-mode duty that requires a wider speed range than a tracked final drive (which operates at 0 to 6 km\/h only); and (3) the drive experiences intermittent standstill during digging (wheels unloaded while outriggers carry the weight) \u2014 producing standstill-corrosion risk that tracked final drives (which remain loaded and stationary during digging) do not face.<\/p>\n<\/div>\n

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Koji je tipi\u010dan vijek trajanja?<\/h3>\n

8,000 to 12,000 hours for the planetary gearbox \u2014 equivalent to 5 to 8 years at 1,500 to 2,000 total machine hours per year (of which 800 to 1,500 are driving hours). Brake pads: 3,000 to 5,000 hours depending on the frequency of city-street slope parking. Seals: 4,000 to 6,000 hours in typical urban conditions. The annual vehicle inspection (required for road registration in most jurisdictions) includes brake-performance verification and noise-level testing \u2014 any deficiency prevents the machine from legal road use until corrected. The dual-life concept (driving hours + digging hours) means the total machine hours overstate the wheel drive duty: a machine at 10,000 total hours may have only 4,000 to 6,000 driving hours on the wheel drive. Maintenance scheduling should track driving hours separately from total machine hours for accurate wheel drive service intervals.<\/p>\n<\/div>\n

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What gear ratio is typical?<\/h3>\n

15:1 to 35:1 for the wheel-end planetary reduction (combined with a hydrostatic or powershift transmission for the full 0 to 40 km\/h speed range). The ratio must balance the highway-speed bearing temperature and noise (favouring lower ratios) with the low-speed positioning smoothness (favouring higher ratios). Most manufacturers settle on 20:1 to 25:1 as the optimal compromise for the 37 km\/h road-speed class.<\/p>\n<\/div>\n

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Does Korea Ever-Power supply wheel drives for wheeled excavators?<\/h3>\n

Yes. Korea Ever-Power manufactures wheel drive planetary gearboxes for wheeled excavators from 5,000 to 30,000 Nm with DIN Class 6 gears for ECE R51 noise compliance, automotive-grade ventilated disc brakes for ECE R13 braking, spring-applied failsafe parking brakes for city-street slope holding, all-steer-compatible output configurations, and standstill-corrosion-protected oil specifications. Provide the excavator manufacturer, model, maximum road speed, operating market (for the applicable road-vehicle regulations), and whether all-wheel steering or crab steering is required for a complete specification covering both the regulatory and the operational positioning requirements. Korea Ever-Power also supplies matched front and rear gearbox sets with verified speed-matching tolerance for all-wheel-drive configurations, ensuring consistent traction and braking performance across all driven axles during both highway transfer and urban repositioning.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Wheeled Excavator Drives \u2014 Road-Legal, Urban-Precise, Dig-Ready<\/div>\n

Korea Ever-Power provides wheeled excavator drives from 5,000 to 30,000 Nm with highway noise compliance, city-street braking, and all-steer urban positioning.<\/p>\n<\/div>\n

View Wheel Drive Range \u2192<\/a><\/p>\n
prodaja@planetarni-gearboxes.com<\/div>\n<\/div>\n<\/div>\n<\/section>\n

Urednik: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power \u00b7 Application Engineering \u00b7 Wheeled Excavators Wheel Drive Planetary Gearbox for Wheeled Excavators A wheeled excavator drives 20 km on the public highway at 37 km\/h, parks on a city street, lowers its outriggers, and excavates a utility trench 2 metres from a gas main. Then it raises the outriggers, drives 500 metres […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[965],"tags":[],"class_list":["post-1208","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts\/1208","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/comments?post=1208"}],"version-history":[{"count":2,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts\/1208\/revisions"}],"predecessor-version":[{"id":1212,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts\/1208\/revisions\/1212"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/media?parent=1208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/categories?post=1208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/tags?post=1208"}],"curies":[{"name":"radni list","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}