{"id":820,"date":"2026-06-15T09:10:25","date_gmt":"2026-06-15T09:10:25","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=820"},"modified":"2026-06-16T01:05:55","modified_gmt":"2026-06-16T01:05:55","slug":"ep-se403t2-double-stage-track-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/fr\/produit\/ep-se403t2-double-stage-track-drive-planetary-gearbox\/","title":{"rendered":"EP-SE403T2 Double-Stage Track Drive Planetary Gearbox"},"content":{"rendered":"

<\/main><\/p>\n
\n

EP-SE403T2 \u2014 Double-Stage Track Drive Planetary Gearbox | 7,000 N\u00b7m, i=15.4\u201340.0, with 270 N\u00b7m Spring Brake<\/h2>\n
\n
\n

\"SE403T2<\/p>\n

\n
\n
7,000 N\u00b7m<\/div>\n
Rated torque<\/div>\n<\/div>\n
\n
270 N\u00b7m<\/div>\n
Spring brake<\/div>\n<\/div>\n
\n
i=15.4\u201340.0<\/div>\n
Double stage<\/div>\n<\/div>\n
\n
3,500 rpm<\/div>\n
Max input<\/div>\n<\/div>\n<\/div>\n
\u2190 Korea Ever-Power Track Drive Series<\/a><\/span><\/div>\n<\/div>\n
\n

Le EP-SE403T2<\/strong> is a double-stage track drive planetary gearbox for heavy crawler excavators, large drilling rigs, and tracked construction crane undercarriages in the 25\u201340 tonne operating class. It delivers 7,000 N\u00b7m at ratios from i=15.4 to i=40.0, with max 3,500 rpm input from high-speed axial piston hydraulic motors. The rotating outer housing drives the sprocket directly \u2014 same inverted epicyclic architecture as all SE series units. What distinguishes it from the EP-SE402T2 above is not just 40% more torque, but the integration of a spring brake that provides independent mechanical parking hold regardless of hydraulic system state.<\/p>\n

\n
\n
\ud83d\uded1 Integral Spring Brake<\/div>\n
270 N\u00b7m \u00d7 i=40 = 10,800 N\u00b7m effective hold. Holds 34 t at 15\u00b0 automatically on pressure loss.<\/div>\n<\/div>\n
\n
\u2699 Double-Stage Torque<\/div>\n
7,000 N\u00b7m in a compact nodular iron housing. Ratio selectable i=15.4\u201340.0 at order.<\/div>\n<\/div>\n
\n
\ud83d\udd12 Metal Face Seals<\/div>\n
Floating lapped metal rings. Deep mud, rock slurry, pressure wash \u2014 no rubber to degrade.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Technical Specifications<\/h2>\n

\u2460 Core Parameters<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Param\u00e8tre<\/th>\nSp\u00e9cification<\/th>\n<\/tr>\n<\/thead>\n
Rated Output Torque<\/td>\n7,000 N\u00b7m<\/td>\n<\/tr>\n
Reduction Ratio Range (i)<\/td>\n15.4 \u2013 40.0 (Double Stage \u2014 specify at order)<\/td>\n<\/tr>\n
Number of Stages<\/td>\n2 (Double Stage \u2014 T2)<\/td>\n<\/tr>\n
Vitesse d'entr\u00e9e maximale<\/td>\n3,500 rpm (rated continuous)<\/td>\n<\/tr>\n
Output Speed at 3,500 rpm (at i=40.0)<\/td>\n~87.5 rpm<\/td>\n<\/tr>\n
Output Speed at 3,500 rpm (at i=15.4)<\/td>\n~227 rpm<\/td>\n<\/tr>\n
Integral Brake Torque<\/td>\n270 N\u00b7m (spring-applied \/ hydraulically released)<\/td>\n<\/tr>\n
Effective Output-Side Braking (at i=40)<\/td>\n~10,800 N\u00b7m per drive (270 \u00d7 40)<\/td>\n<\/tr>\n
Brake Release Pressure (pilot)<\/td>\n15\u201330 bar (confirm with Korea Ever-Power for exact circuit)<\/td>\n<\/tr>\n
Efficacit\u00e9<\/td>\n> 94% (two-stage: ~0.97\u00b2 per stage)<\/td>\n<\/tr>\n
Housing Material<\/td>\nNodular (spheroidal graphite) cast iron<\/td>\n<\/tr>\n
Mounting Type<\/td>\nRotating outer housing flange \u2014 direct sprocket mount<\/td>\n<\/tr>\n
Approximate Weight<\/td>\n~85 kg dry (varies by ratio and motor adapter)<\/td>\n<\/tr>\n
Lubrification<\/td>\nOil bath splash \u2014 API GL-5, ISO VG 150 (<+15\u00b0C) \/ VG 220 (>+15\u00b0C)<\/td>\n<\/tr>\n
Seal System<\/td>\nFloating mechanical face seals (metal-to-metal, duo-cone type)<\/td>\n<\/tr>\n
Plage de temp\u00e9ratures de fonctionnement<\/td>\n\u221225\u00b0C to +90\u00b0C<\/td>\n<\/tr>\n
Oil Change Intervals<\/td>\nFirst at 150 h (run-in); every 1,000 h or annually thereafter<\/td>\n<\/tr>\n
Applicable Motor Type<\/td>\nHigh-speed axial piston motors; hydraulic orbit motors<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u2461 Complete SE Series at a Glance<\/h3>\n
\n\n\n\n\n\n\n\n\n
Mod\u00e8le<\/th>\n\u00c9tapes<\/th>\nCouple<\/th>\nRapport<\/th>\nBrake<\/th>\nMachine class<\/th>\n<\/tr>\n<\/thead>\n
EP-SE400T1<\/td>\nT1 (single)<\/td>\n1,300 N\u00b7m<\/td>\n6.09<\/td>\n130 N\u00b7m<\/td>\n3\u20135 t<\/td>\n<\/tr>\n
EP-SE401T1<\/td>\nT1 (single)<\/td>\n2,000 N\u00b7m<\/td>\n6.2<\/td>\n270 N\u00b7m<\/td>\n6\u201312 t<\/td>\n<\/tr>\n
EP-SE402T2<\/td>\nT2 (double)<\/td>\n5,000 N\u00b7m<\/td>\n12.4\u201337.1<\/td>\nNone (std)<\/td>\n12\u201325 t<\/td>\n<\/tr>\n
EP-SE403T2 \u2605<\/td>\nT2 (double)<\/td>\n7,000 N\u00b7m<\/td>\n15.4\u201340.0<\/td>\n270 N\u00b7m \u2713<\/td>\n25\u201340 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Note: EP-SE402T2 and EP-SE403T2 are both double-stage T2 units. Key difference: EP-SE403T2 includes the integral spring brake as standard; EP-SE402T2 does not. This reflects the heavier machine class and steeper safety requirements at 7,000 N\u00b7m.<\/p>\n<\/section>\n

<\/p>\n

\n

Why EP-SE403T2 Has a Brake When EP-SE402T2 Does Not \u2014 The Engineering Reasoning<\/h2>\n

\"track<\/p>\n

Two double-stage T2 models, separated by one step in torque class, with a fundamental difference in standard configuration: the EP-SE402T2 (5,000 N\u00b7m) ships without an integral spring brake; the EP-SE403T2 (7,000 N\u00b7m) includes one as standard. This is not a product-line inconsistency \u2014 it reflects a genuine engineering boundary between machine weight classes and their respective parking safety requirements.<\/p>\n

\n
\n
EP-SE402T2 \u2014 5,000 N\u00b7m, No Standard Brake<\/div>\n

At the 12\u201325 tonne machine class, the travel circuit’s overcenter (counterbalance) valves provide adequate parking hold in standard operating conditions. These valves create a back-pressure that prevents motor rotation \u2014 and therefore chassis movement \u2014 even when the pump is in neutral. The hydraulic circuit provides the holding function, and the circuit is sized appropriately for this machine weight. An integral spring brake would add cost, weight, and a pilot circuit requirement to a unit where the hydraulic hold is sufficient. Korea Ever-Power offers the spring brake as a custom option on EP-SE402T2 for applications where a mechanical backup is specifically required by safety standards or machine design.<\/p>\n<\/div>\n

\n
EP-SE403T2 \u2014 7,000 N\u00b7m, Spring Brake Standard<\/div>\n

At the 25\u201340 tonne class, the situation changes. Heavier machines parked on steeper slopes impose larger static loads on the travel circuit. More importantly, many international machine safety regulations for excavators and cranes above certain weights mandate a positive mechanical parking hold independent of the hydraulic system \u2014 a requirement an overcenter valve cannot fulfil, because it is a hydraulic device. The spring brake satisfies this regulatory requirement directly. At ratio i=40, the 270 N\u00b7m spring force produces 10,800 N\u00b7m effective braking at the sprocket \u2014 a mathematically verified hold for a 34-tonne machine on a 15\u00b0 gradient. This is why the spring brake is standard on EP-SE403T2: the machines it serves require it by application and often by regulation.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\u00a0<\/p>\n

\n

The Spring Brake at i=40 \u2014 What 270 N\u00b7m at the Input Becomes at the Sprocket<\/h2>\n

The brake torque number in a track drive specification \u2014 270 N\u00b7m \u2014 is the spring force at the input side of the brake disc pack. The machine-holding capability is a function of this figure multiplied by the gear reduction ratio that follows it. For the EP-SE403T2, this has consequences worth understanding before selecting between this model and the EP-SE402T2.<\/p>\n

\n
\n
Effective Output-Side Braking<\/div>\n

At maximum ratio i=40: 270 \u00d7 40 = 10,800 N\u00b7m per drive<\/strong>
\nTwo drives combined: 21,600 N\u00b7m total sprocket-level braking<\/p>\n

At minimum ratio i=15.4: 270 \u00d7 15.4 = 4,158 N\u00b7m per drive<\/strong><\/p>\n

The same 270 N\u00b7m brake in EP-SE401T1 (i=6.2) produces only 1,674 N\u00b7m per drive at sprocket \u2014 6.5\u00d7 less than EP-SE403T2 at i=40. Same input brake torque; completely different machine-holding result.<\/div>\n<\/div>\n
\n
Parking Safety Calculation<\/div>\n

Machine parking hold requirement per drive:
\nT = W \u00d7 sin\u03b8 \u00d7 r \u00f7 2<\/code><\/p>\n

Example: 30-tonne machine (294,300 N), 15\u00b0 slope, 250 mm sprocket radius:
\nT = 294,300 \u00d7 sin15\u00b0 \u00d7 0.25 \u00f7 2 = 9,507 N\u00b7m per drive<\/strong><\/p>\n

EP-SE403T2 at i=40: 10,800 N\u00b7m \u2265 9,507 N\u00b7m required \u2192 \u2713 Holds at 1.14\u00d7 safety factor<\/strong>
\nEP-SE402T2 at i=37.1 (no brake): relies on overcenter valve only<\/div>\n<\/div>\n
\n
How the Brake Operates<\/div>\n

Spring-applied \/ hydraulically released.<\/strong> Heavy Belleville springs permanently clamp the multi-disc friction pack \u2014 brake is ON by default. Travel requires deliberate pilot pressure (15\u201330 bar) to compress the spring stack and release the discs. Releasing the travel control drops pilot pressure; springs re-engage within approximately one second.<\/p>\n

Power loss = automatic brake engagement. No electrical signal, no solenoid, no operator action required. Machine holds on slope at full spring force.<\/div>\n<\/div>\n<\/div>\n

\"EP-SE403T2<\/p>\n<\/section>\n

<\/p>\n

\n

Selecting Your Ratio \u2014 i=15.4 to 40.0<\/h2>\n

Like all double-stage SE models in the Korea Ever-Power track drive planetary gearbox series, the EP-SE403T2 requires a ratio specification at order. The wider range compared to EP-SE402T2 (which tops out at 37.1) extends to i=40.0 \u2014 a 7.9% higher maximum reduction that, combined with the 40% torque increase over EP-SE402T2, makes EP-SE403T2 the correct model for applications where a 30\u201340 tonne machine needs maximum drawbar pull at very low output speeds. The range from i=15.4 to i=40.0 also serves machines needing fast tramming (lower ratio, higher speed) alongside the same platform in a high-pull, slow-travel mode (higher ratio, maximum torque). Specifying the correct ratio for your application requires four inputs \u2014 all of which can be provided at the enquiry stage before any order commitment.<\/p>\n

\n\n\n\n\n\n\n\n\n
Ratio (i)<\/th>\nOutput speed at 3,500 rpm<\/th>\nBrake output-equivalent (\u00d7i)<\/th>\nTypical application<\/th>\n<\/tr>\n<\/thead>\n
i = 15.4<\/td>\n~227 rpm<\/td>\n4,158 N\u00b7m \/ drive<\/td>\nLarge tracked screeners, pipe-layers \u2014 3\u20135 km\/h tramming<\/td>\n<\/tr>\n
i \u2248 20\u201325<\/td>\n~140\u2013175 rpm<\/td>\n5,400\u20136,750 N\u00b7m \/ drive<\/td>\n25-t class excavators \u2014 2\u20133 km\/h balanced speed and torque<\/td>\n<\/tr>\n
i \u2248 30\u201335<\/td>\n~100\u2013117 rpm<\/td>\n8,100\u20139,450 N\u00b7m \/ drive<\/td>\nDrilling rigs, piling machines \u2014 1\u20132 km\/h controlled travel<\/td>\n<\/tr>\n
i = 40.0<\/td>\n~87.5 rpm<\/td>\n10,800 N\u00b7m \/ drive<\/td>\nCrawler cranes, foundation machines \u2014 <1 km\/h, max braking<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Ratio selection formula:<\/span>
\ni = n_motor \u00f7 n_output_required \u00a0|
\nn_output = Q \u00d7 1000 \u00f7 (V_motor \u00d7 \u03b7_v) \u00f7 i \u00a0|
\nParking: T_hold = W \u00d7 sin\u03b8 \u00d7 r \u00f7 2 \u2264 270 \u00d7 i per drive<\/div>\n

When multiple ratios appear to satisfy your kinematic requirement, Korea Ever-Power recommends selecting the higher ratio (slower output speed) over the lower ratio for the following reason: a higher ratio gives the same travel speed at a lower motor input speed, which extends motor bearing life and reduces hydraulic circuit heat generation. Only select the lower ratio if the output speed is a hard requirement (for example, a specified machine travel speed class that the higher ratio cannot achieve at your pump’s maximum flow). The 270 N\u00b7m spring brake adequacy calculation also changes with ratio \u2014 verify the brake hold is sufficient at the ratio you select before finalising the specification, particularly for applications at i=15.4 where the output-side brake equivalent is 4,158 N\u00b7m per drive.<\/p>\n<\/section>\n

\"track<\/p>\n

\n

Where 7,000 N\u00b7m with Spring Brake Is Required<\/h2>\n

The following applications represent the primary market for EP-SE403T2 \u2014 machines where the combination of 7,000 N\u00b7m torque et<\/em> a mechanical spring brake is specified as a safety requirement, not just a convenience.<\/p>\n

\n
\n

Heavy Crawler Excavators \u2014 20\u201340 Tonne Class<\/h3>\n

Standard 20\u201330 tonne excavators represent the largest and highest-volume application for EP-SE403T2. Machines in this class working on 25\u00b0 gradient slopes in road construction and hillside development require the spring brake as a safety requirement independent of the hydraulic system state. Many markets and machine safety standards for excavators above 20 tonnes mandate an independent mechanical hold independent of hydraulic circuit integrity \u2014 a requirement that overcenter valves, which are hydraulic devices, cannot fulfil. The EP-SE403T2 satisfies this at i values from 25\u201335, giving the machine a mechanical parking hold that engages automatically within one second of losing pilot pressure, regardless of whether the hydraulic pump is running. This means the machine holds its position on a steep embankment even if the engine is shut down mid-cycle, a scenario common during operator shift changes and refuelling stops on hillside construction sites. The EP-SE403T2 simultaneously delivers the 7,000 N\u00b7m tractive capacity the heavier 25-tonne machine demands during travel \u2014 a capacity the EP-SE402T2’s 5,000 N\u00b7m ceiling cannot cover with adequate safety margin on hard clay or compacted gravel slopes.<\/p>\n<\/div>\n

\n

Large Tracked Drilling Rigs<\/h3>\n

Drilling rigs in the 25\u201350 tonne chassis class \u2014 carrying the full weight of the mast, rotary head, kelly bar, and drill pipe \u2014 are parked on sloped terrain between bore locations for extended periods, often with the engine shut down. The spring brake ensures the machine cannot roll during these idle periods even with zero hydraulic pressure. At i=40.0 (slowest ratio, highest brake effectiveness), the spring brake holds a 34-tonne rig on a 15\u00b0 slope \u2014 providing the safety margin required when crew work is being performed near a stationary machine on a gradient.<\/p>\n<\/div>\n

\n

Crawler Cranes \u2014 Undercarriage Travel<\/h3>\n

Compact crawler cranes in the 30\u201360 tonne lifting class use EP-SE403T2 for travel undercarriage drives. Travel between lift positions is slow \u2014 typically under 1 km\/h \u2014 requiring high ratios in the i=35\u201340 range to generate sufficient tractive force to move the machine under partial counterweight configuration across compacted site ground. The spring brake is critical during stationary crane operations: when the crane is mid-lift with a suspended load, the tracks must remain absolutely stationary. Any chassis travel \u2014 even a few millimetres \u2014 repositions the crane’s center of gravity relative to the load radius and can exceed the rated capacity margin. The spring brake prevents this movement entirely and independently of whether the travel hydraulic circuit is pressurised, closed, or in any other state. Crane operators performing a long lift sequence with the boom at full radius rely on the EP-SE403T2’s spring brake to hold the undercarriage position throughout the lift cycle without needing to maintain any hydraulic circuit condition in the travel system.<\/p>\n<\/div>\n

\n

Heavy Foundation Piling Equipment<\/h3>\n

Tracked piling rigs positioning large-diameter cast-in-place piles require precise slow-speed travel on stabilised ground with significant superstructure weight. The combination of high ratio (max torque at slow output speed) and spring brake (hold position while the pile is being driven, between moves) matches exactly the EP-SE403T2’s design intent. The high-speed axial piston motor input (3,500 rpm rated) allows the rig’s high-flow pump to serve both travel and rotary head functions without separate low-flow circuit design.<\/p>\n<\/div>\n

\n

Large Tracked Agricultural Machinery<\/h3>\n

Large-frame tracked combines, high-capacity tracked sugarcane harvesters, and orchard tractors exceeding 25 tonnes operating weight require EP-SE403T2 when the EP-SE402T2’s 5,000 N\u00b7m capacity is exceeded. In paddy field and wetland harvest conditions, the floating mechanical face seals withstand continuous mud submersion. The downstream agricultural multi-output gearboxes<\/a> for cutting platforms and grain elevators operate independently on PTO circuits separate from the EP-SE403T2 travel drives.<\/p>\n<\/div>\n

\n

Tracked Utility Platforms \u2014 Arctic and Desert<\/h3>\n

The EP-SE403T2 track drive planetary gearbox operating range from \u221225\u00b0C to +90\u00b0C covers arctic construction and middle-eastern desert grading simultaneously. At \u221225\u00b0C, the ISO VG 150 oil remains pumpable under splash lubrication, and the spring brake Belleville stack retains adequate force without becoming brittle. In desert environments, the nodular iron housing and 94%+ efficiency limit heat build-up compared to less efficient drives. Separate winch and tensioner drives on the same platforms \u2014 for pipeline tensioning or cable pulling work \u2014 use worm gear reducers<\/a> for their self-locking holding function alongside the EP-SE403T2 travel drives.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\"track<\/p>\n

Quality Benchmarks and Dimensional Interchange<\/h2>\n
\n
\n

The EP-SE403T2 is engineered to match the mounting flange bolt circle, spindle bore, drum OD, motor interface, and hydraulic port positions of equivalent Rexroth GFT and Bonfiglioli 700C models in the 7,000 N\u00b7m double-stage class. This enables field replacement of a legacy track drive without chassis modification, welding, or hydraulic rerouting \u2014 a critical consideration when a drive fails on a live construction site and machine downtime directly costs project revenue. Korea Ever-Power confirms the specific dimensional match against the incumbent model number before order placement \u2014 same-day cross-reference at no charge. When the spring brake configuration of the legacy drive differs from the EP-SE403T2 standard (for example, if the incumbent uses a different pilot pressure range), Korea Ever-Power flags this in the cross-reference document and advises on any pilot circuit adjustment required. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.<\/em><\/p>\n

\n
\n
Gear Metallurgy<\/div>\n

EP-SE403T2:<\/strong> High-alloy steel, deep carburised, precision CNC ground \u2014 deep case hardness resists pitting and tooth shear under the impulse loads of a 30-tonne excavator hitting rock.
\nLow-cost alternative:<\/strong> Shallow induction hardening on standard carbon steel \u2014 adequate for light loads, insufficient for sustained heavy shock.<\/p>\n<\/div>\n

\n
Brake Disc Pack<\/div>\n

EP-SE403T2:<\/strong> High-friction sintered multi-disc pack \u2014 270 N\u00b7m consistent hold, fade-resistant under repeated engage\/release cycles, releases cleanly at 15\u201330 bar pilot pressure.
\nLow-cost alternative:<\/strong> Unground or lapped steel plates \u2014 warp under thermal cycling, develop parasitic drag, and lose holding torque progressively.<\/p>\n<\/div>\n

\n
Housing and Bearings<\/div>\n

EP-SE403T2:<\/strong> Nodular iron housing (crack-arresting ductile iron) with oversized taper roller bearings \u2014 handles 85 kg unit weight plus the full machine side load and track tension simultaneously.
\nLow-cost alternative:<\/strong> Grey iron brittle under vibration; undersized ball bearings collapse under machine static weight combined with dynamic travel shock.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n
\n

DIMENSIONAL CROSS-REFERENCE<\/p>\n

Rexroth GFT-equivalent \u2713
\nBonfiglioli 700C-equivalent \u2713
\nSpindle bore confirmed
\nDrum OD confirmed
\nMotor interface confirmed
\nBolt circle confirmed
\nBrake pilot port confirmed<\/div>\n
Confirmation provided before order \u2014 same-day, no charge, no commitment required.<\/div>\n<\/div>\n
\n

Spare Parts Coverage<\/p>\n

Seal kits \u00b7 Taper bearing sets (per stage) \u00b7 Brake disc packs \u00b7 Sun\/planet gear assemblies \u00b7 Housing O-rings. Both stages stocked independently \u2014 failure in stage 1 does not require stage 2 parts.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Why Korea Ever-Power<\/h2>\n
\n
\n
\ud83d\udcd0<\/div>\n

Ratio + Brake Specification Same Day<\/h3>\n

Provide target travel speed, motor displacement, pump flow rate, machine gross weight, and steepest parking gradient. Korea Ever-Power returns: the ratio selection from the i=15.4\u201340.0 range based on your kinematic requirement; a brake adequacy calculation confirming that 270 N\u00b7m \u00d7 selected ratio exceeds your required output-side holding torque at the specified parking condition; and an explicit dimensional match against your incumbent drive model \u2014 spindle bore, drum OD, sprocket bolt circle, motor interface, and brake pilot port. All of this is provided same business day. No order commitment, no fee, and no obligation to purchase. If any standard ratio does not match your requirement precisely, Korea Ever-Power will advise on alternative configurations or custom options at the same time.<\/p>\n<\/div>\n

\n
\ud83d\udd29<\/div>\n

Pre-Assembled Drive + Valves, Ready to Mount<\/h3>\n

EP-SE403T2 is available as a pre-assembled, tested package: gearbox + high-speed axial piston motor + overcenter valve + pressure relief valve, brake function verified. All fasteners torqued, oil filled, brake release confirmed at 15\u201330 bar. Arrives at machine assembly ready for chassis mounting and hydraulic connection.<\/p>\n<\/div>\n

\n
\ud83c\udf21\ufe0f<\/div>\n

\u221225\u00b0C to +90\u00b0C \u2014 Full Climate Coverage<\/h3>\n

Widest temperature range in the SE series. The nodular iron housing provides superior thermal mass, dissipating heat more effectively at high ambient than equivalent steel housings \u2014 this is one reason the EP-SE403T2 can operate to +90\u00b0C while the EP-SE401T1 (lighter housing, single stage) is rated to +85\u00b0C. At the low end, ISO VG 150 GL-5 oil maintains adequate viscosity at \u221225\u00b0C for splash lubrication to reach both gear stages without pump-driven pre-circulation. The spring brake Belleville spring stack retains its design clamping force at \u221225\u00b0C without any special preheating procedure \u2014 important for machines parked outdoors in arctic construction conditions where the hydraulic system is completely cold and unpressurised at start of day. The floating mechanical face seals maintain their spring-loaded face contact at \u221225\u00b0C and provide the same sealing behaviour as at ambient temperature, without any change in cold-start procedure.<\/p>\n<\/div>\n

\n
\ud83d\udccb<\/div>\n

12-Month Commissioning \/ 18-Month Ship Warranty<\/h3>\n

Manufacturing and material defects covered for 12 months from commissioning or 18 months from shipment. Warranty covers both planetary stages and the spring brake assembly. Warranty replacement parts can be dispatched independently \u2014 a brake disc pack failure, for example, is resolved with a brake pack kit, not a full unit replacement.<\/p>\n<\/div>\n

\n
\u23f1\ufe0f<\/div>\n

7\u201314 Day Stock \/ 30\u201345 Days Custom<\/h3>\n

Standard ratio configurations from Korea Ever-Power stock in 7\u201314 days. Custom ratio and pre-assembled motor packages: 30\u201345 days. For machine-down emergencies, contact Korea Ever-Power with the incumbent drive model, required ratio, and ship-to location \u2014 same-day lead time confirmation.<\/p>\n<\/div>\n

\n
\ud83c\udfed<\/div>\n

Dedicated R\u00e9ducteur plan\u00e9taire<\/a> Manufacturer<\/h3>\n

Korea Ever-Power manufactures exclusively planetary gearboxes \u2014 from compact EP-TM servo units to EP-SE track drives to large-capacity winch and slewing drives. Specialisation means the engineering team, tooling, quality control, and spare parts cataloguing are all focused on one product family rather than split across multiple gear types.<\/p>\n<\/div>\n<\/div>\n

\"Korea<\/p>\n<\/section>\n

<\/p>\n

\n

Field Reviews<\/h2>\n
\n
\n
\n
G<\/div>\n
\n
G. Papadopoulos \u2014 Crawler Excavator OEM Engineer<\/div>\n
Verified Purchase \u00b7 Athens, Greece<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

EP-SE403T2 at i=28 on our 25-tonne crawler excavator range. We specified this over EP-SE402T2 specifically because Greek construction regulations for excavators over 20 tonnes operating on public road embankments require a positive mechanical hold independent of the hydraulic circuit \u2014 the spring brake satisfies this. Korea Ever-Power confirmed dimensional fit to our existing legacy drives within the same day. At 2,800 hours of mixed rock and clay excavation, both drives are clean on oil samples. The brake releases without delay at our 22 bar pilot setting and engages immediately when the travel spool centres.<\/p>\n

EP-SE403T2, i=28 \u00b7 25-t excavator \u00b7 2,800 h, brake compliance confirmed, clean oil samples<\/div>\n<\/div>\n
\n
\n
S<\/div>\n
\n
S. Iversen \u2014 Arctic Construction Equipment Manager<\/div>\n
Verified Purchase \u00b7 Troms\u00f8, Norway<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We run tracked utility machines at up to \u221225\u00b0C on Arctic Circle infrastructure projects. The spring brake was a non-negotiable specification \u2014 our machines park on 15\u00b0 snow-covered slopes with the engine off overnight. At \u221225\u00b0C, hydraulic systems are cold and unpressurised; we cannot rely on overcenter valves for parking hold. The EP-SE403T2 spring brake holds without hydraulic support. GL-5 VG 150 oil cold-start behaviour at \u221225\u00b0C was excellent \u2014 no resistance on first travel engagement. We also replaced our old Rexroth GFT drives 1:1 without any chassis modification. Seal performance through two Norwegian winters has been flawless.<\/p>\n

EP-SE403T2 \u00b7 Arctic utility crawler \u00b7 \u221225\u00b0C spring brake hold confirmed, 2 winters<\/div>\n<\/div>\n
\n
\n
T<\/div>\n
\n
T. Al-Rashidi \u2014 Infrastructure Plant Manager<\/div>\n
Verified Purchase \u00b7 Riyadh, Saudi Arabia<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We operate a fleet of 22\u201328 tonne crawler excavators on highway cut and fill work in the Riyadh region \u2014 ambient temperature peaks at +48\u00b0C for 3\u20134 months per year. Our previous track drives ran housing temperatures exceeding +90\u00b0C in sustained travel on steep embankments and required forced air cooling shrouds as a workaround. The EP-SE403T2 housing temperature peaks at approximately 82\u00b0C in our worst-case duty cycle \u2014 comfortably within the +90\u00b0C specification \u2014 without any additional cooling. The >94% efficiency at this torque class means approximately 6% of the transmitted power becomes heat instead of the 8\u201310% typical of alternative drives in this class, which translates directly into lower housing and hydraulic oil temperature in sustained operation. The fine desert silica (sub-30 micron particles that penetrate standard rubber lip seals in hours) has made no impact whatsoever on the floating metal face seals after 3,500 hours across six units in our fleet. We sample oil at every 500-hour interval \u2014 silica particle count has remained at baseline since commissioning. ROI versus our previous European supplier across these six units: dramatic, and the procurement cycle time of 7\u201314 days from Korea Ever-Power stock (versus 8\u201312 weeks from our legacy supplier) has eliminated the spare unit inventory we previously had to carry.<\/p>\n

EP-SE403T2 \u00b7 22\u201328 t crawler excavator \u00b7 +48\u00b0C ambient, 3,500 h, zero seal failure vs 600 h previously<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Korea Ever-Power \u2014 Complete Drive Portfolio<\/h2>\n

EP-SE403T2 is one product within a wider range of heavy-duty and precision drive solutions from Korea Ever-Power.<\/p>\n

\n
\"Korea<\/div>\n
\n
\n

Track Drive Planetary Gearboxes \u2014 Full SE Series<\/h3>\n

EP-SE400T1 (1,300 N\u00b7m) \u00b7 EP-SE401T1 (2,000 N\u00b7m) \u00b7 EP-SE402T2 (5,000 N\u00b7m, no brake) \u00b7 EP-SE403T2 (7,000 N\u00b7m, with brake, this model). Higher-capacity multi-stage models available to 450,000 N\u00b7m for large mining excavators and tunnel boring machines.<\/p>\n<\/div>\n

\n

High Precision Planetary Gearboxes \u2014 Servo & CNC<\/a><\/h3>\n

P0 \u22641 arcmin to P2 grade. EP-TM, EP-TNF, EP-TEG, EP-TMR series. Servo motor, CNC rotary axis, robot joint, semiconductor handling. The opposite end of the Korea Ever-Power planetary gearbox range from EP-SE track drives.<\/p>\n<\/div>\n

\n

Winch, Slewing, and Wheel Drives<\/h3>\n

Winch drive planetary gearboxes for marine cranes and offshore hoists; slewing drives for excavator swing and yaw drives; wheel drive units for aerial work platforms and wheeled heavy vehicles. Contact Korea Ever-Power for the complete selection guide.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Technical FAQ<\/h2>\n
\n
\n

Q<\/span>Is the spring brake adequate for all parking scenarios, or should overcenter valves be used alongside it?<\/h3>\n

The 270 N\u00b7m spring brake, acting through the gear reduction ratio, provides substantial static parking hold \u2014 at i=40, approximately 10,800 N\u00b7m per drive, sufficient to hold approximately 34 tonnes stationary on a 15\u00b0 slope (two drives combined). However, there are two important distinctions to understand. First, the spring brake is designed for static parking hold \u2014 it clamps the gear train stationary when pilot pressure drops to zero. It is not designed for dynamic braking during active travel (where motor inertia and load inertia act against the brake). For machines requiring controlled deceleration on downhill travel or on very steep grades during movement, overcenter (counterbalance) valves in the motor circuit are the engineering-correct solution for dynamic hold. Second, for steep gradients beyond the spring brake capacity at lower ratios (for example, at i=15.4, the effective output-side hold is only 4,158 N\u00b7m per drive \u2014 adequate for approximately 13 tonnes at 15\u00b0), additional overcenter valve back-pressure provides supplementary dynamic hold during active travel. Korea Ever-Power can specify both the overcenter valve setting and confirm spring brake adequacy for your specific machine weight, slope, and ratio combination \u2014 provide these parameters at enquiry.<\/p>\n<\/div>\n

\n

Q<\/span>Why does the EP-SE402T2 have no standard spring brake but the EP-SE403T2 does?<\/h3>\n

Both EP-SE402T2 and EP-SE403T2 are double-stage T2 units, but at different torque levels targeting different machine weight classes. At the EP-SE402T2 torque and weight class (5,000 N\u00b7m, 12\u201325 tonne machines), the industry standard is hydraulic parking hold via overcenter valves \u2014 adequate for this machine class. At the EP-SE403T2 torque and weight class (7,000 N\u00b7m, 25\u201340 tonne machines), the higher machine weight and steeper gradient requirements in many markets and machine safety standards require a positive mechanical brake independent of the hydraulic circuit. The spring brake is added at this model precisely because the application demands it \u2014 not as a differentiation feature, but as a functional engineering requirement for the heavier machine class. EP-SE402T2 can also be ordered with an optional integrated brake on custom order; EP-SE403T2 includes it as standard.<\/p>\n<\/div>\n

\n

Q<\/span>Can EP-SE403T2 replace Rexroth GFT or Bonfiglioli 700C units at this torque class?<\/h3>\n

For units in the 7,000 N\u00b7m double-stage class with matching ratio, the EP-SE403T2 mounting flange bolt circle, spindle bore, drum OD, and motor interface dimensions match the equivalent Rexroth GFT and Bonfiglioli 700C models. Korea Ever-Power provides an explicit dimensional cross-reference document against the specific legacy model number before order placement. The ratio must also match \u2014 both the legacy drive and EP-SE403T2 offer multiple ratio options within the same housing class, so confirm the incumbent ratio before ordering. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.<\/em><\/p>\n<\/div>\n

\n

Q<\/span>What gear oil volume and service schedule applies?<\/h3>\n

API GL-5 gear oil: ISO VG 150 for ambient below +15\u00b0C, VG 220 above +15\u00b0C. The EP-SE403T2 double-stage housing contains approximately 3.0\u20134.5 litres depending on ratio and motor adapter \u2014 confirm exact fill volume on the Korea Ever-Power dimensional drawing for your specific configuration. Fill through the topmost port in operating orientation; check level at the side port. First oil change at 150 operating hours to flush run-in particles from both stages; every 1,000 hours or annually thereafter. The larger oil volume at this torque class provides better thermal buffering than smaller single-stage units.<\/p>\n<\/div>\n

\n

Q<\/span>Can Korea Ever-Power supply the hydraulic motor with the gearbox?<\/h3>\n

Yes. EP-SE403T2 is available pre-assembled with a matched high-speed axial piston motor, integrated overcenter valve, and pressure relief valve as a single tested assembly. Specify your pump flow rate, system pressure, and required travel speed \u2014 Korea Ever-Power selects the motor displacement, sets the overcenter valve to the correct back-pressure for your machine and gradient, verifies brake function, and ships the assembly oil-filled and function-tested.<\/p>\n<\/div>\n

\n

Q<\/span>What is the recommended oil fill procedure for a double-stage unit, and does the brake require separate lubrication?<\/h3>\n

For the EP-SE403T2, the entire internal housing \u2014 including both planetary stages and the brake disc pack \u2014 is filled from the same oil fill port. The multi-disc brake discs are oil-bathed (wet brake design), which provides the following advantages: the oil film prevents dry friction heat spikes that warp brake plates; the oil carries away any brake dust generated during engage\/release cycles; and the brake engagement force remains consistent because the oil viscosity at operating temperature provides a predictable separation film between the discs when the brake releases. Fill through the topmost port in the operating orientation using API GL-5 ISO VG 150 (ambient below +15\u00b0C) or VG 220 (above +15\u00b0C). The combined fill volume for the double-stage housing with the brake pack is typically 3.0\u20134.5 litres \u2014 confirm the exact volume on the Korea Ever-Power dimensional drawing for your specific ratio and motor adapter configuration. Do not mix oil grades. Change at 150 hours (run-in) and every 1,000 hours or annually thereafter \u2014 the wet brake disc pack condition is assessed by monitoring oil colour and any metallic particle increase at each scheduled oil change.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n
\n

Cost of One Week’s Downtime vs the Cost of Premium Track Drives<\/h2>\n

A 25-tonne excavator on a commercial construction project generates revenue \u2014 directly or through cost avoidance \u2014 at rates that vary by market and application but typically range from several hundred to several thousand dollars per operating day. A single week of unplanned downtime caused by a track drive failure on a time-sensitive project can easily represent $10,000\u2013$50,000 in direct losses: idle plant hire costs, delayed project milestones, crane demobilisation fees, and supplementary equipment hire. EP-SE403T2 pricing, procured directly from Korea Ever-Power in 7\u201314 days, represents a fraction of this figure for a single downtime event. The floating mechanical face seals, deep-carburised gear sets, and nodular iron housing that characterise EP-SE403T2 are not premium features in the abstract \u2014 they are the specific engineering elements that prevent the failure modes (seal failure, tooth pitting, housing fracture) that cause unplanned downtime. The ROI calculation is straightforward: one avoided downtime event pays for multiple drive sets at Korea Ever-Power pricing. For procurement managers quantifying the business case for switching from a legacy supplier, Korea Ever-Power can provide a cost-per-hour-of-operation comparison based on your fleet size, application, and typical maintenance history.<\/p>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Specify EP-SE403T2 \u2014 Ratio, Brake Adequacy, and Dimensional Fit Confirmed Before Order<\/h2>\n

Provide machine weight, steepest working gradient, motor specification, target travel speed, and incumbent drive model. Korea Ever-Power returns ratio selection, brake adequacy calculation, and dimensional confirmation \u2014 same day.<\/p>\n

7,000 N\u00b7m \u00b7 i=15.4\u201340.0 (selectable) \u00b7 270 N\u00b7m spring brake \u00b7 3,500 rpm \u00b7 \u221225\u00b0C to +90\u00b0C<\/p>\n

Request Quote \u2014 EP-SE403T2 \u2192
\n<\/a><\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"
\n
\u2605 The Double-Stage That Gets a Spring Brake \u2014 And Why That Matters at 7,000 N\u00b7m<\/div>\n

The EP-SE402T2 (5,000 N\u00b7m double-stage) ships in standard form without an integral spring brake \u2014 at that torque class, overcenter valves in the travel circuit handle parking hold adequately. The EP-SE403T2 adds an integral 270 N\u00b7m spring-applied \/ hydraulically-released multi-disc brake. The reason is arithmetic: at ratio i=40, that 270 N\u00b7m spring brake produces an effective output-side braking equivalent of 10,800 N\u00b7m per drive \u2014 enough to hold approximately 34 tonnes stationary on a 15\u00b0 slope. At the 25\u201340 tonne machine class this unit serves, a mechanical backup to the hydraulic circuit is the engineering standard, not an option.<\/p>\n<\/div>","protected":false},"featured_media":822,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[966],"product_tag":[],"class_list":["post-820","product","type-product","status-publish","has-post-thumbnail","product_cat-track-drive-planetary-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/product\/820","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/comments?post=820"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/media\/822"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/media?parent=820"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/product_brand?post=820"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/product_cat?post=820"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/fr\/wp-json\/wp\/v2\/product_tag?post=820"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}