{"id":891,"date":"2026-06-18T01:43:29","date_gmt":"2026-06-18T01:43:29","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=891"},"modified":"2026-06-18T01:43:29","modified_gmt":"2026-06-18T01:43:29","slug":"603l2a-planetary-wheel-drive-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/cs\/produkt\/603l2a-planetary-wheel-drive-gearbox\/","title":{"rendered":"603L2A Planetary Wheel Drive Gearbox Reducer \u2014 2-Stage"},"content":{"rendered":"
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EP-603 Series \u00b7 Two-Stage Planetary Wheel Drive<\/div>\n

603L2A \u2014 Four Ratios, One Housing, Zero Compromise<\/h2>\n

The jump from a single-stage to a two-stage planetary wheel drive gearbox<\/a> is not simply about more torque. It is about giving the vehicle designer a set of gear ratios that span the gap between highway-speed roading and low-speed, high-traction earthmoving \u2014 all within the same wheel hub envelope. The EP-603L2A does this with four discrete ratios (19, 23, 32, and 40) that cover a 2:1 speed-to-torque trade-off range, matching the requirements of mid-weight wheeled machines from 5 to 8 tonnes.<\/p>\n

At 4,000 Nm maximum output torque and 3,000 rpm input speed, the 603L2A accepts both high-speed axial piston motors for variable-displacement hydrostatic circuits and fixed-displacement gear motors for simpler open-loop systems. The integral 210 Nm parking brake and manual declutch carry forward from the 601 series, maintaining the field-serviceability and towing safety that operators expect from a professional-grade wheel drive.<\/p>\n<\/div>\n

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V\u00fdstupn\u00ed to\u010div\u00fd moment<\/span>4,000 Nm<\/span><\/div>\n
Ratios Available<\/span>19 \/ 23 \/ 32 \/ 40<\/span><\/div>\n
Maxim\u00e1ln\u00ed vstupn\u00ed rychlost<\/span>3,000 rpm<\/span><\/div>\n
\u00da\u010dinnost<\/span>> 95%<\/span><\/div>\n
IP Class Sealed<\/span>
\n85 kg<\/span>
\nDeclutch<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

\"603L2A<\/p>\n

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603L2A Wheel Drive Gearbox \u2014 Technical Parameters<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Output torque (rated max)<\/td>\n4,000 Nm<\/td>\n<\/tr>\n
P\u0159evodov\u00e9 pom\u011bry<\/td>\n19 : 1 \u00a0|\u00a0 23 : 1 \u00a0|\u00a0 32 : 1 \u00a0|\u00a0 40 : 1<\/td>\n<\/tr>\n
Planetary stages<\/td>\n2<\/td>\n<\/tr>\n
Maximum input speed<\/td>\n3,000 rpm<\/td>\n<\/tr>\n
Mechanical efficiency<\/td>\n\u2265 95%<\/td>\n<\/tr>\n
Parking brake<\/td>\n210 Nm, spring-applied, hydraulic release<\/td>\n<\/tr>\n
Emergency towing<\/td>\nManual declutch (free-wheel disconnect)<\/td>\n<\/tr>\n
Wheel mounting<\/td>\nRotating flange, SAE\/ISO bolt circle compatible<\/td>\n<\/tr>\n
Dry weight<\/td>\nApprox. 85 kg<\/td>\n<\/tr>\n
Maz\u00e1n\u00ed<\/td>\nOil bath splash, API GL-5 EP gear oil<\/td>\n<\/tr>\n
Provozn\u00ed teplota<\/td>\n-20 to +85 deg C<\/td>\n<\/tr>\n
Materi\u00e1l ozuben\u00e9ho kola<\/td>\nCarburised alloy steel, CNC ground, HRC 58-62<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

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Choosing the Right Ratio \u2014 Speed Versus Tractive Force<\/h2>\n

The four ratios in the 603L2A represent four distinct operating profiles for the same vehicle platform. Selecting the wrong ratio means either a machine that cannot climb the grade it needs to (ratio too low) or one that crawls on the flat when it should be roading at 20 km\/h (ratio too high). The table below maps each ratio to its ground speed and tractive force at a reference motor speed of 2,500 rpm with a 500 mm tyre rolling radius.<\/p>\n

\n\n\n\n\n\n\n\n\n
Pom\u011br<\/th>\nOutput Speed (rpm)<\/th>\nGround Speed<\/th>\nForce at Wheel (N)<\/th>\nNejlep\u0161\u00ed pro<\/th>\n<\/tr>\n<\/thead>\n
19<\/td>\n131.6<\/td>\n24.8 km\/h<\/td>\n8,000<\/td>\nRoad travel, site-to-site transit<\/td>\n<\/tr>\n
23<\/td>\n108.7<\/td>\n20.5 km\/h<\/td>\n8,000<\/td>\nMixed road\/site work<\/td>\n<\/tr>\n
32<\/td>\n78.1<\/td>\n14.7 km\/h<\/td>\n8,000<\/td>\nMostly off-road, moderate grades<\/td>\n<\/tr>\n
40<\/td>\n62.5<\/td>\n11.8 km\/h<\/td>\n8,000<\/td>\nHeavy traction, steep terrain<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Ground speed calculated at 2,500 rpm motor input, 500 mm tyre rolling radius, zero slip. Force at wheel = output torque \/ tyre radius = 4,000 \/ 0.5 = 8,000 N per wheel at rated torque (constant across all ratios). The ratio determines how fast you reach that torque threshold, not how much force is available. At ratio 40, the motor reaches the gearbox torque limit at a lower hydraulic pressure than at ratio 19, meaning the hydraulic system operates at lower pressure for the same tractive output \u2014 reducing pump wear and oil temperature.<\/p>\n<\/section>\n

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Wheel Rim Mounting \u2014 What to Verify Before You Order<\/h2>\n
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A planetary wheel drive gearbox bolts directly to the wheel rim \u2014 there are no axle shafts, no hubs, no intermediate bearings between the gearbox output flange and the tyre. This means the bolt circle diameter (BCD), stud size, centering spigot diameter, and flange offset must match between the gearbox and the rim to within tenths of a millimetre. A mismatch in any of these dimensions creates either a drive that cannot be assembled or, worse, one that assembles but concentrates load on a subset of the bolts.<\/p>\n

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Bolt Circle Diameter<\/strong><\/p>\n

Provide the rim BCD (centre-to-centre distance across bolt pattern). The 603L2A output flange accommodates standard SAE and ISO patterns. Non-standard patterns require a custom flange plate \u2014 lead time approximately 2 weeks additional.<\/p>\n<\/div>\n

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Centering Spigot<\/strong><\/p>\n

The centering spigot ensures concentricity between the gearbox and the rim. Provide the spigot bore diameter and depth from the rim drawing. A loose spigot fit causes vibration; an interference fit prevents assembly without heating the rim.<\/p>\n<\/div>\n

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Flange Offset<\/strong><\/p>\n

The distance from the gearbox mounting face to the wheel centreline determines tyre clearance to the chassis. Submit the required offset dimension and we verify that the 603L2A housing clears the rim well and tyre sidewall at full steering lock.<\/p>\n<\/div>\n

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Stud Torque Specification<\/strong><\/p>\n

Wheel mounting studs must be torqued to specification using a calibrated torque wrench. Re-torque after the first 50 operating hours and then at every scheduled service. Under-torqued studs work loose; over-torqued studs stretch and fatigue-crack.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"Planetary<\/div>\n<\/div>\n<\/section>\n

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Hydraulic Wheel Drive Applications in the 5-8 Tonne Class<\/h2>\n
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Telehandlers and Rough-Terrain Forklifts<\/h3>\n

Telehandlers in the 6-8 tonne class need both the speed to road between job sites at 20+ km\/h and the traction to climb loaded ramps at 15-25% gradient. The 603L2A at ratio 23 is the sweet spot for most telehandler applications: fast enough for productive site transit, geared low enough to handle typical construction site grades without stalling the hydrostatic circuit. The 3,000 rpm input speed matches the common 63-80 cc\/rev axial piston motors used in telehandler hydrostatic transmissions.<\/p>\n<\/div>\n

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Backhoe Loaders and Compact Wheel Excavators<\/h3>\n

Backhoe loaders spend roughly equal time travelling between dig locations and working at the trench. The 603L2A at ratio 19 maximises roading speed for machines that cover long distances on paved roads between sites, while ratio 32 suits machines that work predominantly off-road on soft soils. Many OEMs offer the same backhoe model with two wheel drive ratio options \u2014 one for road-heavy utility work and one for off-road earthmoving \u2014 using the same 603L2A housing.<\/p>\n<\/div>\n

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Agricultural Sprayers and Self-Propelled Harvesters<\/h3>\n

Self-propelled crop sprayers and small harvesters require controlled low-speed field travel (5-12 km\/h) with precise speed regulation from the hydrostatic wheel drive system<\/a>. The 603L2A at ratio 40 delivers this speed range at motor speeds of 1,000-2,500 rpm, keeping the hydrostatic pump and motor in their most efficient operating band. The sealed oil-bath housing prevents crop chemical and fertiliser contact with the gear set \u2014 a common failure mode with chain-drive alternatives in agricultural applications.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"Planetary<\/p>\n

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Explore the Full Planetary Gearbox Range<\/h2>\n
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\"ZR24<\/p>\n

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

For the upper-structure swing mechanism on the same backhoe loaders and compact excavators that use the 603L2A for wheel propulsion.<\/p>\n<\/div>\n<\/div>\n

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\"SE400T1<\/p>\n

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

Building the tracked variant of your platform? EP-SE track drives cover the same torque range as the 603 wheel drive series for rubber-track undercarriages.<\/p>\n<\/div>\n<\/div>\n

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\"EP-ZDS<\/p>\n

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

EP-ZDS series for telehandler boom luffing servo drives, steering mechanisms, and auxiliary rotation systems requiring sub-arcminute positioning.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Wheel Drive Planetary Gearbox \u2014 Technical Questions Answered<\/h2>\n
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Why is the 603L2A brake torque (210 Nm) lower than the 601L1A (450-600 Nm)?<\/h3>\n

The 210 Nm brake on the 603L2A is an input-side brake that acts through the gear ratio. Its effective holding torque at the wheel is 210 Nm multiplied by the gear ratio \u2014 for example, 210 x 23 = 4,830 Nm at ratio 23, or 210 x 40 = 8,400 Nm at ratio 40. This is substantially higher than the 601L1A output-side brake. The input-side placement reduces the brake disc diameter and weight, which is important at 85 kg total unit weight. The trade-off is that the brake cannot hold if the gearbox internal gears are damaged \u2014 in that unlikely event, the vehicle requires external wheel chocks.<\/p>\n<\/div>\n

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Can I change the gear ratio in the field, or is it fixed at the factory?<\/h3>\n

The ratio is fixed at the factory. The sun gears and ring gears are matched sets that determine the ratio; swapping them requires complete disassembly, precision measurement, and re-assembly with the correct bearing preload. It is not a field-changeable parameter. If your vehicle platform needs to offer two speed ranges (for example, ratio 19 for road models and ratio 32 for off-road models), order both variants separately and install the appropriate one during vehicle assembly.<\/p>\n<\/div>\n

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What size hydraulic motor pairs best with the 603L2A wheel drive?<\/h3>\n

That depends on the target ground speed and the available hydraulic flow. For a machine requiring 20 km\/h at ratio 23 with a 500 mm tyre: the required output speed is 106 rpm, so the motor speed is 106 x 23 = 2,438 rpm. If your pump delivers 100 L\/min, the motor displacement should be approximately 100,000 \/ 2,438 = 41 cc\/rev. Common pairings are 45-80 cc\/rev variable-displacement motors at 200-350 bar, driven by load-sensing pumps. Contact Korea Ever-Power<\/a> with your pump flow and target speed for a verified motor-gearbox match.<\/p>\n<\/div>\n

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How does a two-stage planetary wheel drive compare to a hub reduction axle?<\/h3>\n

A conventional hub reduction axle uses a central differential, half-shafts, and a planetary hub reducer at each wheel. The total system weight is typically 2-3 times higher than a pair of wheel drive gearboxes for the same torque class, and the differential introduces a mechanical complexity (limited-slip or locking mechanism) that the independent hydrostatic wheel drive eliminates entirely. Each wheel drive is independently controlled through its own hydraulic motor, giving the vehicle inherent differential steering capability without any mechanical differential. The trade-off is that the hydrostatic system must be designed to handle the full flow for independent wheel speed control, which increases the hydraulic component cost compared to a single-pump axle drive.<\/p>\n<\/div>\n

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Is the 603L2A wheel drive gearbox suitable for road-registered vehicles?<\/h3>\n

Yes, in jurisdictions that permit hydrostatic-drive vehicles on public roads (most countries allow this for agricultural and construction vehicles under 40 km\/h). At ratio 19, the 603L2A achieves 25+ km\/h ground speed which meets the minimum travel speed requirements for most road registrations. The parking brake satisfies the requirement for an independent holding brake on gradients. Verify local regulations for braking performance, lighting, and speed limiter requirements specific to your vehicle class and region.<\/p>\n<\/div>\n

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What is the difference between the 603L2A and the 603L2B wheel drive gearbox reducer<\/a> variant?<\/h3>\n

The 603L2A and 603L2B share the same 4,000 Nm torque rating, the same four ratios (19, 23, 32, 40), and the same two-stage planetary architecture. The difference is in the motor input flange and the housing configuration: the L2A uses a lighter housing (85 kg) optimised for standard SAE motor flanges, while the L2B (95 kg) includes a heavier-duty housing with additional mounting provisions for specific motor adapter configurations and higher radial bearing capacity. If your application involves high side-loading on the wheel (large tyres, aggressive cornering, uneven terrain), the L2B may be the better choice. For standard applications, the L2A provides the same performance at lower weight and cost.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Field Reports<\/h2>\n
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M<\/div>\n
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Mark H. \u2014 Telehandler Product Manager<\/div>\n
Verified Purchase \u00b7 Midlands, UK \u00b7 May 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We evaluated the 603L2A ratio 23 against two European competitors for our 7-tonne telehandler platform. The Ever-Power unit matched the performance envelope at a price point that allowed us to hit our target production cost. We have 28 machines in the field now across UK rental fleets. The feedback from operators is that roading speed feels responsive and the machine handles 20% ramp grades with a loaded pallet without any hesitation from the hydrostatic circuit.<\/p>\n<\/div>\n

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R<\/div>\n
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Ravi P. \u2014 Agricultural Equipment Integrator<\/div>\n
Verified Purchase<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Self-propelled sprayer, ratio 40. The machine needs to crawl at 6-8 km\/h through standing crops with precise speed control. Previously used chain drives that stretched every season and threw lubrication into the crop canopy. The sealed wheel drive eliminated both problems. After three spray seasons the seals are holding up well against the herbicide and fertiliser exposure. We ordered the same units for a second sprayer build.<\/p>\n<\/div>\n

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J<\/div>\n
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Jason C. \u2014 Workshop Foreman<\/div>\n
Verified Purchase \u00b7 Jan 2026<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Backhoe loader fleet, ratio 19 for road-heavy utility work. The drives perform fine and the roading speed is good for moving between job sites. The 4-star rating is a practical gripe: the oil drain plug on the 603L2A is positioned so that on our particular backhoe chassis, you have to jack the machine to get a drain pan underneath. An extended drain fitting or a relocated drain port would save 30 minutes per oil change across a fleet. Product quality and reliability are solid though.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

The 603L2A gives machine designers what the single-stage 601 series cannot: a choice between high ground speed and maximum drawbar pull without changing the hydraulic motor. Four ratios in a single housing. At ratio 19, a standard 80 cc\/rev motor at 3,000 rpm pushes a backhoe loader to 25+ km\/h roading speed. Flip the same frame to ratio 40, and that loader crawls up a 30% grade with double the tractive force at half the speed. The two-stage planetary reduction inside this 85 kg wheel drive planetary gearbox makes that range possible.<\/div>","protected":false},"featured_media":899,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[968],"product_tag":[],"class_list":["post-891","product","type-product","status-publish","has-post-thumbnail","product_cat-wheel-drive-planetary-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/product\/891","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/comments?post=891"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/media\/899"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/media?parent=891"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/product_brand?post=891"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/product_cat?post=891"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/cs\/wp-json\/wp\/v2\/product_tag?post=891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}