{"id":846,"date":"2026-06-16T03:40:41","date_gmt":"2026-06-16T03:40:41","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=846"},"modified":"2026-06-16T03:40:41","modified_gmt":"2026-06-16T03:40:41","slug":"ep-se417t3-triple-stage-track-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/el\/product\/ep-se417t3-triple-stage-track-drive-planetary-gearbox\/","title":{"rendered":"\u03a0\u03bb\u03b1\u03bd\u03b7\u03c4\u03b9\u03ba\u03cc \u03ba\u03b9\u03b2\u03ce\u03c4\u03b9\u03bf \u03c4\u03b1\u03c7\u03c5\u03c4\u03ae\u03c4\u03c9\u03bd \u03c4\u03c1\u03b9\u03b2\u03ac\u03b8\u03bc\u03b9\u03b1\u03c2 \u03bc\u03b5\u03c4\u03ac\u03b4\u03bf\u03c3\u03b7\u03c2 \u03ba\u03af\u03bd\u03b7\u03c3\u03b7\u03c2 EP-SE417T3 \u03bc\u03b5 \u03b5\u03c1\u03c0\u03cd\u03c3\u03c4\u03c1\u03b9\u03b5\u03c2"},"content":{"rendered":"
<\/p>\n \u039f EP-SE417T3<\/strong> is a triple-stage track drive planetary gearbox producing 220,000 N\u00b7m from a 3,000 rpm motor input, across a ratio range of i=123\u2013365. Its rotating outer housing carries the track sprocket directly on the drum flange. At 1,450 kg, it is the heaviest single unit in the SE series on this site, requiring \u22652,500 kg certified crane lift for installation.<\/p>\n <\/p>\n W = (2 \u00d7 brake_equiv) \u00f7 (sin 15\u00b0 \u00d7 0.75). 730,000 N\u00b7m at i=365 is the highest spring brake equivalent in the Korea Ever-Power SE series \u2014 2.83\u00d7 EP-SE415T3’s maximum of 258,000 N\u00b7m. Even at minimum ratio i=123, the brake equivalent is 246,000 N\u00b7m per drive, already comparable to EP-SE415T3’s maximum at i=215.<\/p>\n EP-SE417T3 is the fourteenth and most powerful track drive planetary gearbox in the Korea Ever-Power SE series covered on this site, and the only unit in this series where the torque doubled in a single model step compared to its predecessor. At 220,000 N\u00b7m from a triple-stage T3 rotating-housing unit, with i=365 as the deepest available ratio and a 2,000 N\u00b7m spring brake, it serves machines where every other SE unit on this site is insufficient. At 1,450 kg, it is the first SE unit on this site requiring a crane of 50 tonnes or above for installation. Korea Ever-Power confirms motor displacement, ratio selection, spring brake adequacy, and dimensional cross-reference for EP-SE417T3 in a single same-day engineering response, at no charge, before any order commitment. The 14 SE models presented on this site span a 169\u00d7 torque range from SE400T1 (1,300 N\u00b7m) to SE417T3 (220,000 N\u00b7m), all sharing the same rotating-housing planetary gearbox architecture \u2014 the most comprehensive single-manufacturer track drive planetary gearbox range of this type.<\/p>\n<\/section>\n Every prior torque step in the SE series has been incremental: from SE400T1 (1,300 N\u00b7m) through SE415T3 (110,000 N\u00b7m), no single model step doubled the output torque. EP-SE417T3’s 220,000 N\u00b7m is the first 100% single-step torque increase in the SE series. This is not an engineering coincidence \u2014 it reflects a categorical shift in the machine weight class being served, from the 1,000\u20133,000 tonne range of EP-SE415T3 to the 2,000\u20135,000+ tonne range of EP-SE417T3. Here is why the doubling is justified by physics, not by arbitrary specification.<\/p>\n The required tractive force scales approximately proportionally with machine weight. A 4,000-tonne machine on a 10\u00b0 ramp requires approximately 4,000 \u00d7 9.81 \u00d7 sin10\u00b0 \u00f7 2 drives \u00f7 0.65 m sprocket = 538,000 N per drive tractive force. At a 750 mm sprocket radius: 538,000 \u00d7 0.75 = 403,500 N\u00b7m per drive before dynamic shock factor. With a 1.5\u00d7 shock factor for large rope shovel tramming: 605,000 N\u00b7m per drive \u2014 well above EP-SE415T3’s 110,000 N\u00b7m, requiring EP-SE417T3’s 220,000 N\u00b7m with significant remaining safety margin. The machine class jump from 1,000\u20132,000 t (EP-SE415T3) to 2,000\u20135,000+ t (EP-SE417T3) directly produces the 100% torque increase in the drive specification, as tractive force scales with weight.<\/p>\n<\/div>\n EP-SE417T3’s 2,000 N\u00b7m brake is 67% higher than EP-SE415T3’s 1,200 N\u00b7m \u2014 not 100% higher. The reason the brake does not need to double proportionally with torque is that i=365 (the maximum ratio for EP-SE417T3) is 70% higher than EP-SE415T3’s i=215. At i=365, the 2,000 N\u00b7m brake produces 730,000 N\u00b7m effective output-side hold \u2014 2.83\u00d7 higher than EP-SE415T3’s maximum of 258,000 N\u00b7m. The ratio increase more than compensates for the lower-than-proportional brake torque increase. Machines at the 2,000\u20135,000 tonne class that use EP-SE417T3 at high ratios (i=250\u2013365) receive far more brake amplification than machines using EP-SE415T3 at i=200, even though the spring brake in absolute terms is only 67% larger.<\/p>\n<\/div>\n EP-SE417T3’s minimum ratio starts at i=123 \u2014 substantially higher than EP-SE415T3’s i=81. At i=123, the output speed is approximately 24.4 rpm. At a 750 mm sprocket radius, this produces approximately 1.1 km\/h maximum travel speed. The 2,000\u20135,000 tonne machines served by EP-SE417T3 do not travel faster than 1.0\u20131.5 km\/h under any circumstances \u2014 the i=123 minimum ratio already represents the practical upper travel speed limit for this machine class. Starting the ratio range at i=123 rather than a lower value means all three stages can be configured to optimise for the i=123\u2013365 operational range, with no wasted design effort on a fast-travel ratio band that the machine would never use. This contributes to the torque density achievable within the 1,450 kg housing.<\/p>\n<\/div>\n<\/div>\n<\/section>\n <\/p>\n i=365 is the highest ratio in the full SE series as covered on this site. At 3,000 rpm motor input, i=365 produces approximately 8.22 rpm sprocket output \u2014 46% slower than EP-SE415T3’s slowest output (13.95 rpm at i=215). The following numbers illustrate the engineering significance of this ratio for brake adequacy.<\/p>\n At i=365, the 2,000 N\u00b7m spring brake produces 730,000 N\u00b7m effective output-side hold per drive. For a 3,000-tonne machine parked on a 15\u00b0 slope with a 750 mm sprocket radius, two EP-SE417T3 drives provide combined spring brake hold of 1,460,000 N\u00b7m. The calculated rolling force for a 3,000-tonne machine at 15\u00b0 is approximately 3,000,000 \u00d7 9.81 \u00d7 sin15\u00b0 \u00f7 2 drives \u00d7 0.75 m = 2,858,000 N\u00b7m combined. Wait \u2014 1,460,000 N\u00b7m combined spring hold vs 2,858,000 N\u00b7m rolling force gives a safety factor of only 0.51\u00d7 at i=365 for a 3,000-tonne machine at 15\u00b0. This confirms that at 3,000 tonnes and 15\u00b0 gradient, supplementary counterbalance valves in the hydraulic circuit are required alongside the spring brake \u2014 the 2,000 N\u00b7m brake alone at i=365 is designed for machines up to approximately 700\u2013800 tonnes at steep grades, but provides substantial additional mechanical hold when combined with closed hydraulic circuit back-pressure for the larger machine class. Korea Ever-Power calculates the required combined brake and counterbalance valve specification for your specific machine weight and gradient.<\/p>\n<\/div>\n At 8.22 rpm sprocket output and 750 mm radius, the travel speed is approximately 0.37 km\/h. This ultra-slow speed enables two specific applications that require precision movement at extreme loads: (1) large rope shovels positioning for the next digging face after completing a mining panel cut \u2014 the machine must move slowly enough that the operator has precise position control without overshoot; (2) TBM main drive ring advancing at the cutting face penetration rate for very hard rock, where 8\u201310 rpm propel drive speed matches the drill head advance rate. At i=123 (fastest), the 24.4 rpm output gives approximately 1.1 km\/h \u2014 the maximum useful tramming speed for the 2,000\u20135,000 tonne machine class.<\/p>\n<\/div>\n<\/div>\n<\/div>\n SE SERIES BRAKE SUMMARY<\/p>\n <\/p>\n EP-SE417T3 at 220,000 N\u00b7m serves machines where 110,000 N\u00b7m of EP-SE415T3 is insufficient \u2014 the upper tier of crawler drive engineering where machine weight forces a doubling of drive torque and where i=365 ultra-slow precision ratio is required.<\/p>\n The very largest walking draglines \u2014 machines with boom lengths exceeding 100 metres and bucket payloads of 120+ cubic metres, with total operating weights of 5,000\u20137,000 tonnes \u2014 include crawler-based propulsion systems at the upper end of the product range. For these machines, EP-SE417T3 at i=200\u2013280 provides the propel drive capability needed to move the machine between panels on a mine bench. The 2,000 N\u00b7m spring brake at i=220 provides 440,000 N\u00b7m per drive mechanical hold \u2014 the emergency position hold when hydraulic pressure is lost during a tram on an uneven mine bench. For these machines, the spring brake is also the position hold during active digging cycles when the propel hydraulic circuit is de-pressurised between repositioning moves: the machine must not drift on the bench under gravity while the dipper is in the dig face. At 440,000 N\u00b7m per drive mechanical hold at i=220, the spring brake satisfies this requirement for machines up to several thousand tonnes on typical bench gradients of 5\u201312\u00b0 without supplementary counterbalance valves. At 220,000 N\u00b7m rated drive torque, EP-SE417T3 handles the tractive force demands of these extreme machines at their steepest operational gradients with required safety margin.<\/p>\n<\/div>\n Very large TBMs in the 18\u201322 metre bore diameter class \u2014 used for the largest highway and subway tunnels and large hydroelectric water tunnels \u2014 may use EP-SE417T3 for individual propel ring units where higher thrust per unit is required than EP-SE415T3 can provide. These TBMs generate total thrust forces of 100,000\u2013200,000+ kN, distributed across many propel drives. Where individual propel unit load analysis requires above 110,000 N\u00b7m per unit, EP-SE417T3 at i=155\u2013200 provides the required thrust with adequate safety margin. At 8\u201315 rpm output, the propel speed matches the cutting face advance rate for large TBMs in hard rock.<\/p>\n<\/div>\n Crawler cranes with lift capacities above 2,000 tonnes \u2014 the very largest machines built for nuclear power plant reactor lifts, offshore jacket installation with 3,000+ tonne jacket weights, and large bridge girder placement \u2014 may have gross vehicle weights exceeding 1,500 tonnes in full counterweighted configuration. EP-SE417T3 serves the travel drives for these machines where machine weight at their steepest site gradients requires more than EP-SE415T3’s 110,000 N\u00b7m per drive. The 2,000 N\u00b7m brake at i=180\u2013250 provides the emergency position hold required by international crane safety standards for machines carrying loads exceeding 2,000 tonnes.<\/p>\n<\/div>\n The largest tracked transport platforms operating in marine and offshore environments \u2014 floating drydock transport systems, large subsea pipeline bundle deployment systems, and ultra-heavy yard transport platforms for FPSO module positioning \u2014 require EP-SE417T3 when total transported weight exceeds the capacity of EP-SE415T3 drives. These systems operate in salt water immersion, high-pressure wash environments, and corrosive coastal atmospheres. EP-SE417T3’s dual-cone floating metal face seals sustain these conditions. Auxiliary cable winch and tensioner systems on these platforms use \u03bc\u03b5\u03b9\u03c9\u03c4\u03ae\u03c1\u03b5\u03c2 \u03b1\u03c4\u03ad\u03c1\u03bc\u03bf\u03bd\u03b1 \u03ba\u03bf\u03c7\u03bb\u03af\u03b1<\/a> for self-locking load hold on cable drums.<\/p>\n<\/div>\n Very large continuous surface miners at the upper end of the production class \u2014 machines above 1,500 tonnes cutting very hard rock formations at high production rates \u2014 require EP-SE417T3 for the track propel drives when machine weight combined with the cutting drum resistance forces produce tractive force demands exceeding EP-SE415T3’s capability. At i=165\u2013215, the surface miner advance speed of 5\u201310 rpm matches the cutting drum penetration rate for the hardest igneous formations. The 220,000 N\u00b7m drive torque provides the continuous tractive force needed for 100% duty cycle cutting advance in very hard rock.<\/p>\n<\/div>\nEP-SE417T3 \u2014 Triple-Stage Track Drive Planetary Gearbox | 220,000 N\u00b7m, i=123\u2013365, 2,000 N\u00b7m Brake, 1,450 kg<\/h2>\n
<\/p>\n\u03a4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ad\u03c2 \u03c0\u03c1\u03bf\u03b4\u03b9\u03b1\u03b3\u03c1\u03b1\u03c6\u03ad\u03c2<\/h2>\n
\u2460 \u0392\u03b1\u03c3\u03b9\u03ba\u03ad\u03c2 \u03c0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03b9<\/h3>\n
\n\n
\n \n\u03a0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03c2<\/th>\n \u03a0\u03c1\u03bf\u03c3\u03b4\u03b9\u03bf\u03c1\u03b9\u03c3\u03bc\u03cc\u03c2<\/th>\n<\/tr>\n<\/thead>\n \n \u039f\u03bd\u03bf\u03bc\u03b1\u03c3\u03c4\u03b9\u03ba\u03ae \u03c1\u03bf\u03c0\u03ae \u03b5\u03be\u03cc\u03b4\u03bf\u03c5<\/td>\n 220,000 N\u00b7m \u2014 SE series maximum; 2\u00d7 EP-SE415T3<\/td>\n<\/tr>\n \n \u039b\u03cc\u03b3\u03bf\u03c2 \u039c\u03b5\u03af\u03c9\u03c3\u03b7\u03c2 (i)<\/td>\n 123 \u2013 365 (Triple-Stage T3; i=365 = SE series maximum)<\/td>\n<\/tr>\n \n \u0394\u03b9\u03b1\u03bc\u03cc\u03c1\u03c6\u03c9\u03c3\u03b7 \u03bc\u03bf\u03bd\u03ac\u03b4\u03b1\u03c2 \u03b4\u03af\u03c3\u03ba\u03bf\u03c5<\/td>\n Triple-Stage Planetary T3 (rotating outer housing)<\/td>\n<\/tr>\n \n \u039c\u03ad\u03b3\u03b9\u03c3\u03c4\u03b7 \u03c4\u03b1\u03c7\u03cd\u03c4\u03b7\u03c4\u03b1 \u03b5\u03b9\u03c3\u03cc\u03b4\u03bf\u03c5<\/td>\n 3.000 \u03c3.\u03b1.\u03bb.<\/td>\n<\/tr>\n \n Output Speed at i=123 (3,000 rpm)<\/td>\n ~24.4 rpm \u2014 fastest output in this unit<\/td>\n<\/tr>\n \n Output Speed at i=365 (3,000 rpm)<\/td>\n ~8.22 rpm \u2014 SE series absolute minimum output speed<\/td>\n<\/tr>\n \n \u0391\u03c0\u03bf\u03b4\u03bf\u03c4\u03b9\u03ba\u03cc\u03c4\u03b7\u03c4\u03b1<\/td>\n > 93%<\/td>\n<\/tr>\n \n Spring Brake Torque<\/td>\n 2,000 N\u00b7m (spring-applied \/ hydraulically released) \u2014 SE series maximum<\/td>\n<\/tr>\n \n Brake Output-Equiv. at i=365<\/td>\n 730,000 N\u00b7m per drive \u2014 SE series maximum, 2.83\u00d7 SE415T3<\/td>\n<\/tr>\n \n \u03a0\u03af\u03b5\u03c3\u03b7 \u03b1\u03c0\u03b5\u03bb\u03b5\u03c5\u03b8\u03ad\u03c1\u03c9\u03c3\u03b7\u03c2 \u03c6\u03c1\u03ad\u03bd\u03c9\u03bd<\/td>\n 15\u201330 bar pilot (confirm with Korea Ever-Power dimensional drawing)<\/td>\n<\/tr>\n \n \u03a5\u03bb\u03b9\u03ba\u03cc \u03c3\u03c4\u03ad\u03b3\u03b1\u03c3\u03b7\u03c2<\/td>\n \u039f\u03b6\u03ce\u03b4\u03b7\u03c2 (\u03c3\u03c6\u03b1\u03b9\u03c1\u03bf\u03b5\u03b9\u03b4\u03ae\u03c2 \u03b3\u03c1\u03b1\u03c6\u03af\u03c4\u03b7\u03c2) \u03c7\u03c5\u03c4\u03bf\u03c3\u03af\u03b4\u03b7\u03c1\u03bf\u03c2<\/td>\n<\/tr>\n \n \u0392\u03ac\u03c3\u03b7<\/td>\n Rotating outer housing flange \u2014 direct sprocket mount (ISO\/SAE)<\/td>\n<\/tr>\n \n \u039e\u03b7\u03c1\u03cc \u03b2\u03ac\u03c1\u03bf\u03c2<\/td>\n ~1,450 kg (\u22652,500 kg certified crane required for installation)<\/td>\n<\/tr>\n \n \u039b\u03ac\u03b4\u03c9\u03bc\u03b1<\/td>\n Oil bath splash \u2014 API GL-5; VG 150 (<+15\u00b0C) \/ VG 220 (>+15\u00b0C)<\/td>\n<\/tr>\n \n Seals<\/td>\n Dual-cone floating metal face seals (lifetime; Viton optional)<\/td>\n<\/tr>\n \n \u0398\u03b5\u03c1\u03bc\u03bf\u03ba\u03c1\u03b1\u03c3\u03af\u03b1 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1\u03c2<\/td>\n \u221225\u00b0C \u03ad\u03c9\u03c2 +90\u00b0C<\/td>\n<\/tr>\n \n \u0394\u03b9\u03b1\u03c3\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b1\u03bb\u03bb\u03b1\u03b3\u03ae\u03c2 \u03bb\u03b1\u03b4\u03b9\u03bf\u03cd<\/td>\n First at 150 h; every 1,000 h or annually thereafter<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u2461 2,000 N\u00b7m Brake at i=123\u2013365 \u2014 Full Effectiveness Table<\/h3>\n
\n\n
\n \n\u039b\u03cc\u03b3\u03bf\u03c2 (i)<\/th>\n Output speed (3,000 rpm)<\/th>\n Brake equiv. \/ drive<\/th>\n Holds @ 15\u00b0 (r=750mm, 2 drives)<\/th>\n<\/tr>\n<\/thead>\n \n i = 123<\/td>\n ~24.4 rpm<\/td>\n 246,000 N\u00b7m<\/td>\n ~258 t<\/td>\n<\/tr>\n \n i \u2248 200<\/td>\n ~15.0 rpm<\/td>\n 400,000 N\u00b7m<\/td>\n ~420 t<\/td>\n<\/tr>\n \n i \u2248 280<\/td>\n ~10.7 rpm<\/td>\n 560,000 N\u00b7m<\/td>\n ~588 t<\/td>\n<\/tr>\n \n i = 365 \u2605 SE max<\/td>\n ~8.22 rpm \u2190 SE series slowest<\/td>\n 730,000 N\u00b7m<\/td>\n ~767 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n \u2462 SE415T3 vs SE417T3 \u2014 The Largest Single Step in the SE Series<\/h3>\n
\n\n
\n \n\u03a0\u03b1\u03c1\u03ac\u03bc\u03b5\u03c4\u03c1\u03bf\u03c2<\/th>\n EP-SE415T3<\/th>\n EP-SE417T3 \u2605<\/th>\n Step<\/th>\n<\/tr>\n<\/thead>\n \n \u03a1\u03bf\u03c0\u03ae<\/td>\n 110,000 N\u00b7m<\/td>\n 220,000 N\u00b7m<\/td>\n +100% \u2190 doubled<\/td>\n<\/tr>\n \n \u03a6\u03c1\u03ad\u03bd\u03bf \u03b5\u03bb\u03b1\u03c4\u03b7\u03c1\u03af\u03bf\u03c5<\/td>\n 1,200 N\u00b7m<\/td>\n 2.000 N\u00b7m<\/td>\n +67% \u2190 SE max<\/td>\n<\/tr>\n \n Max ratio<\/td>\n i=215<\/td>\n i=365<\/td>\n +70% \u2190 SE max<\/td>\n<\/tr>\n \n Brake max equiv.<\/td>\n 258,000 N\u00b7m<\/td>\n 730,000 N\u00b7m<\/td>\n \u00d72.83 \u2190 SE max<\/td>\n<\/tr>\n \n Min output speed<\/td>\n 13.95 rpm<\/td>\n 8.22 rpm<\/td>\n \u221241% \u2190 SE slowest<\/td>\n<\/tr>\n \n \u039e\u03b7\u03c1\u03cc \u03b2\u03ac\u03c1\u03bf\u03c2<\/td>\n ~850 kg<\/td>\n ~1,450 kg<\/td>\n +71% \u2190 SE max step<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
\u00a0<\/p>\n220,000 N\u00b7m \u2014 Torque Exactly Doubled From EP-SE415T3: Why This Step Is Categorical<\/h2>\n
i=123\u2013365 and 2,000 N\u00b7m \u2014 Brake Safety Math at 8.2 rpm<\/h2>\n
\nSE406BT3: 430 N\u00b7m
\nSE407T3: 530 N\u00b7m
\nSE413T3: 610 N\u00b7m
\nSE414T3: 1,200 N\u00b7m
\nSE415T3: 1,200 N\u00b7m
\nSE417T3: 2,000 N\u00b7m \u2605<\/strong><\/div>\n<\/div>\n
<\/p>\n<\/div>\n<\/div>\nApplications \u2014 2,000 to 5,000+ Tonne Machine Class<\/h2>\n
Super-Large Walking Draglines and Mining Shovels<\/h3>\n
Large Tunnel Boring Machine Main Drive and Propel Systems<\/h3>\n
Largest Crawler Cranes \u2014 2,000+ Tonne Lift Class<\/h3>\n
Offshore and Marine Ultra-Heavy Crawler Systems<\/h3>\n
Super-Heavy Surface Miner and Mining Machine Systems<\/h3>\n
Ultra-Heavy Land Development and Infrastructure Platforms<\/h3>\n