{"id":1029,"date":"2026-06-23T05:43:45","date_gmt":"2026-06-23T05:43:45","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?p=1029"},"modified":"2026-06-23T05:43:45","modified_gmt":"2026-06-23T05:43:45","slug":"track-drive-planetary-gearbox-for-bulldozers","status":"publish","type":"post","link":"https:\/\/planetary-gearboxes.com\/es\/track-drive-planetary-gearbox-for-bulldozers\/","title":{"rendered":"Track Drive Planetary Gearbox for Bulldozers"},"content":{"rendered":"
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\"Track<\/p>\n
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Application Engineering \u00b7 Track Drives \u00b7 Bulldozers<\/div>\n

Track Drive Planetary Gearbox for Bulldozers \u2014 Where Sustained Torque Matters More Than Peak Torque<\/h1>\n

An excavator generates peak torque for seconds during a pivot. A bulldozer generates near-peak torque for minutes<\/em> during every push pass. This sustained-load duty cycle \u2014 80 to 100% of rated torque, continuously, with the blade buried in material \u2014 is what separates bulldozer track drive engineering from every other tracked machine on earth.<\/p>\n

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

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What Makes a Bulldozer Track Drive Different from Every Other Final Drive<\/h2>\n
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Every tracked machine \u2014 excavators, crawler cranes, compact loaders, drilling rigs \u2014 uses a track drive planetary gearbox<\/a> to convert motor speed into sprocket torque. But the bulldozer places a unique combination of demands on this gearbox that no other machine replicates.<\/p>\n

The fundamental difference is the blade. A bulldozer blade weighing 2,000 to 8,000 kg engages material at ground level, and the engine drives the tracks forward against the resistance of the material being pushed. This resistance \u2014 the drawbar pull \u2014 is sustained at near-maximum motor torque for the entire length of the push pass, typically 30 to 120 metres. The track drive gearbox transmits this sustained torque for 1 to 4 minutes continuously per pass, with only a brief relief during the return (empty blade, reverse travel).<\/p>\n

Compare this to an excavator: the travel motor operates at full torque for a few seconds during repositioning, then idles completely while the upper structure swings, digs, and dumps. The excavator track drive duty cycle is 5 to 15% \u2014 the bulldozer track drive duty cycle is 60 to 85%. This difference in duty cycle is what makes the bulldozer the most thermally demanding application for any track drive planetary gearbox in the entire heavy equipment industry.<\/p>\n<\/div>\n

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Duty Cycle Comparison<\/p>\n

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Excavador<\/div>\n
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<\/div>\n<\/div>\n
5 \u2013 15% travel duty<\/div>\n<\/div>\n
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Crawler Crane<\/div>\n
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<\/div>\n<\/div>\n
3 \u2013 8% travel duty<\/div>\n<\/div>\n
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Bulldozer<\/div>\n
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60 \u2013 85% push duty<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n
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Drawbar Pull \u2014 The Force That Defines Bulldozer Track Drive Sizing<\/h2>\n

Drawbar pull is the net horizontal force available at the hitch point behind the machine after subtracting the rolling resistance of the tracks on the ground. It is the single most important number in bulldozer engineering \u2014 and the number the track drive planetary gearbox must sustain for the duration of every push pass.<\/p>\n

The drawbar pull of a bulldozer is limited by the lower of two values: the engine torque delivered through the drivetrain to the tracks, or the maximum friction force between the tracks and the ground (traction limit). On firm ground, the engine power is usually the limiting factor. On loose or wet ground, the tracks slip before the engine reaches full power \u2014 the traction limit governs.<\/p>\n

\n\n\n\n\n\n\n\n\n
Dozer Class<\/th>\nWeight (t)<\/th>\nEngine (kW)<\/th>\nMax Drawbar Pull (kN)<\/th>\nTrack Drive Torque (Nm)<\/th>\nSustained Duty<\/th>\n<\/tr>\n<\/thead>\n
Small (D3 \u2013 D5)<\/td>\n7 \u2013 14<\/td>\n55 \u2013 75<\/td>\n60 \u2013 110<\/td>\n18,000 \u2013 33,000<\/td>\n60 \u2013 75%<\/td>\n<\/tr>\n
Medium (D6 \u2013 D7)<\/td>\n18 \u2013 28<\/td>\n120 \u2013 185<\/td>\n140 \u2013 240<\/td>\n42,000 \u2013 72,000<\/td>\n65 \u2013 80%<\/td>\n<\/tr>\n
Large (D8 \u2013 D9)<\/td>\n35 \u2013 52<\/td>\n230 \u2013 310<\/td>\n280 \u2013 420<\/td>\n84,000 \u2013 126,000<\/td>\n70 \u2013 85%<\/td>\n<\/tr>\n
Mining (D10 \u2013 D11)<\/td>\n65 \u2013 115<\/td>\n430 \u2013 700<\/td>\n500 \u2013 850<\/td>\n150,000 \u2013 255,000<\/td>\n75 \u2013 85%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Track drive torque calculated at sprocket PCD 600 mm (small\/medium) and 750 mm (large\/mining). Per-track values shown (total machine drawbar pull is split across two tracks). Sustained duty is the percentage of each operating hour that the track drive transmits torque at or above 70% of rated output.<\/p>\n<\/section>\n

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Drawbar Pull Calculation \u2014 Sizing the Track Drive for a D7-Class Bulldozer<\/h2>\n

The worked example below demonstrates how to calculate the required track drive torque for a medium-class bulldozer in production dozing. Unlike the excavator gradeability calculation (which sizes for a brief climb), this calculation sizes for the sustained push load that the track drive must carry for minutes at a time.<\/p>\n

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Drawbar Pull Torque Sizing \u2014 D7-Class Bulldozer, Production Dozing<\/div>\n
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Dado:<\/div>\n
\u00a0\u00a0Machine operating weight: 24,000 kg<\/div>\n
\u00a0\u00a0Engine power: 160 kW at 2,000 rpm<\/div>\n
\u00a0\u00a0Transmission efficiency (engine to sprocket): 85%<\/div>\n
\u00a0\u00a0First gear speed: 3.2 km\/h = 0.889 m\/s<\/div>\n
\u00a0\u00a0Sprocket PCD: 600 mm (r = 0.3 m)<\/div>\n
Step 1 \u2014 Maximum drawbar pull from engine power:<\/div>\n
\u00a0\u00a0F_max = (P x n_trans) \/ v<\/div>\n
\u00a0\u00a0F_max = (160,000 x 0.85) \/ 0.889<\/div>\n
\u00a0\u00a0F_max = 152,980 N (153 kN) per machine<\/strong><\/div>\n
Step 2 \u2014 Traction limit check:<\/div>\n
\u00a0\u00a0F_traction = W x g x mu<\/div>\n
\u00a0\u00a0F_traction = 24,000 x 9.81 x 0.60 (clay)<\/div>\n
\u00a0\u00a0F_traction = 141,264 N (141 kN) \u2190 traction governs on clay<\/strong><\/div>\n
Step 3 \u2014 Per-track drive torque (sustained):<\/div>\n
\u00a0\u00a0T_sustained = (F_traction \/ 2) x r<\/div>\n
\u00a0\u00a0T_sustained = (141,264 \/ 2) x 0.3<\/div>\n
\u00a0\u00a0T_sustained = 21,190 Nm per track \u2014 sustained for 1-4 min\/pass<\/strong><\/div>\n
Step 4 \u2014 Apply bulldozer service factor (SF = 1.75 sustained duty):<\/div>\n
\u00a0\u00a0T_required = 21,190 x 1.75<\/div>\n
\u00a0\u00a0T_required = 37,083 Nm minimum rated torque (continuous)<\/strong><\/div>\n
\u2192 Specify track drive rated CONTINUOUS torque \u2265 37,083 Nm<\/div>\n
\u2192 Korea Ever-Power 42,000 Nm class track drive \u2714<\/div>\n<\/div>\n<\/div>\n
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Why the bulldozer SF (1.75) is lower than the excavator SF (2.0) \u2014 but the thermal demand is higher<\/div>\n

The excavator SF of 2.0 accounts for brief but severe bidirectional shock loads (counter-rotation). The bulldozer SF of 1.75 accounts for less severe peaks but much longer sustained loading. The thermal consequence is inverted: the bulldozer track drive operates at 70 to 85% of its rated torque for minutes continuously, generating sustained heat that accumulates in the oil bath. The excavator track drive operates at 100% for seconds, then cools during idle. A bulldozer track drive sized for the correct torque but without adequate thermal capacity will overheat and degrade the gear oil \u2014 even though the instantaneous torque never exceeds the mechanical rating.<\/p>\n<\/div>\n<\/section>\n

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Thermal Management \u2014 The Challenge That Distinguishes Bulldozer Track Drives from All Others<\/h2>\n

A track drive planetary gearbox is an enclosed oil bath with no external cooling circuit. The only heat rejection path is conduction through the housing wall and convection from the housing surface to the surrounding air (or mud). In a bulldozer, the heat input is sustained and the heat rejection is limited \u2014 producing the highest steady-state operating temperatures of any track drive application.<\/p>\n

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Heat Generation Rate<\/div>\n

At 42,000 Nm output through a 3-stage planetary reduction at 94% efficiency: heat = power x (1 – efficiency). At 37 rpm output: power = 42,000 x 37 x 2 x 3.14159 \/ 60 = 162.7 kW. Heat = 162.7 x 0.06 = 9.8 kW<\/strong> dissipated into the oil bath continuously during every push pass.<\/p>\n<\/div>\n

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Oil Volume and Temperature Rise<\/div>\n

Typical oil volume: 3.0 litres. Specific heat of gear oil: approximately 1.8 kJ\/(kg x K). Oil density: 0.88 kg\/L. Thermal mass: 3.0 x 0.88 x 1.8 = 4.75 kJ\/K. Temperature rise per minute at 9.8 kW: 9.8 x 60 \/ 4.75 = 124 degrees C per minute<\/strong> if no heat is rejected through the housing \u2014 which explains why adequate housing surface area and ground contact cooling are essential.<\/p>\n<\/div>\n

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Equilibrium Temperature<\/div>\n

In practice, the housing rejects heat through conduction to the track frame and convection to air. The equilibrium oil temperature during sustained dozing is typically 80 to 100 degrees C in temperate climates and 90 to 115 degrees C in tropical climates. Above 110 degrees C, standard gear oil viscosity falls below the minimum for reliable gear tooth film \u2014 accelerating wear.<\/p>\n<\/div>\n<\/div>\n

This is why bulldozer track drives use larger oil volumes (3 to 6 litres vs 1.5 to 3 litres for excavators at the same torque class), heavier housings with more surface area, and in some mining-class machines, external oil cooling loops that no other track drive application requires. The Korea Ever-Power planetary gearbox<\/a> engineering team designs bulldozer-specific track drives with increased housing fin area, higher-temperature seal compounds, and synthetic oil specifications for tropical and desert applications.<\/p>\n<\/section>\n

\"Track<\/p>\n

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Track Slip \u2014 The Deliberate Overload Condition That Bulldozers Impose on Their Final Drives<\/h2>\n

In most tracked machines, track slip is a failure condition \u2014 the tracks lose grip and the machine stops moving. In a bulldozer, controlled track slip is a normal operating condition. When the blade encounters hard material or a large obstacle, the operator maintains full throttle and allows the tracks to slip against the ground until the material yields or the machine is redirected. During slip, the track drive transmits full motor stall torque while the output sprocket rotates slowly or intermittently \u2014 the worst-case thermal condition for a planetary gearbox.<\/p>\n

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What happens inside the gearbox during track slip<\/div>\n

The hydraulic motor runs at full pressure (stall torque) while the sprocket barely moves. The planetary gears carry full tooth load at near-zero output speed. The oil is churned rather than circulated \u2014 generating heat without the cooling flow that normal rotation provides. The planet pin bearings see full radial load without the hydrodynamic oil wedge that depends on rotational speed. This is the condition that causes the most rapid bearing wear in bulldozer track drives.<\/p>\n<\/div>\n

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How long is too long?<\/div>\n

Most track drive manufacturers rate their units for a maximum of 30 seconds of continuous stall (full torque, zero output speed). Beyond 30 seconds, the oil temperature in the vicinity of the planet bearings rises above the lubricant film failure threshold. Bulldozer operators routinely exceed this limit \u2014 60 to 90 seconds of sustained slip is common when pushing frozen material or breaking through compacted layers. The track drive must be designed for this reality, not the theoretical limit.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Three Failure Modes Specific to Bulldozer Track Drives<\/h2>\n
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1<\/div>\n
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Thermal degradation of gear oil from sustained high-duty pushing<\/div>\n

The most common bulldozer-specific failure. Sustained operation at 80 to 100% torque for hours per shift raises the oil temperature above 100 degrees C. At these temperatures, the oil oxidises and loses viscosity. The gear tooth film thins. Micro-pitting begins on the planet gear flanks. Over 2,000 to 3,000 hours of hot operation, the pitting grows into spalling and the gearbox develops audible noise under load.<\/p>\n

Prevention: Monitor oil temperature during peak summer operations. Use synthetic 75W-90 in tropical climates. Change oil at 1,000 h intervals (not 2,000 h) for heavy-duty dozing.<\/div>\n<\/div>\n<\/div>\n
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2<\/div>\n
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Planet pin bearing boundary lubrication failure during prolonged track slip<\/div>\n

During track slip, the sprocket rotates slowly or stops while the motor torque remains at maximum. The planet gears carry full radial load but rotate too slowly to build the hydrodynamic oil wedge that normally separates the rollers from the raceway. The bearings operate in boundary lubrication \u2014 metal-to-metal contact through a thin residual oil film. Each slip event removes a microscopic layer of bearing surface. Accumulated over thousands of slip events per year, the bearing clearance grows until the planet gears wobble and contact the ring gear non-uniformly.<\/p>\n

Prevention: Limit continuous slip duration to 60 seconds maximum. Use EP (extreme-pressure) additive gear oil. Specify track drives with full-complement roller bearings (not caged) for bulldozer duty.<\/div>\n<\/div>\n<\/div>\n
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3<\/div>\n
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Sprocket tooth wear from abrasive ground material ingestion<\/div>\n

Bulldozers operate with the sprocket hub at or below ground level \u2014 often buried in the material being pushed. Sand, gravel, and crusite (crushed rock) particles enter the sprocket-to-track interface and act as a grinding compound. The sprocket teeth wear at 2 to 5 times the rate seen on excavators operating on the same material, because the bulldozer sprocket is continuously engaged with the track under load while the material surrounds it. When sprocket teeth wear past the service limit, the track chain engagement becomes unstable and the tracks can derail under side-loading.<\/p>\n

Prevention: Inspect sprocket teeth every 500 hours. Rotate or replace sprocket segments when wear reaches 60% of tooth profile. Keep the undercarriage clean \u2014 pressurised washout at end of each shift in sandy conditions.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n
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Ripping Mode \u2014 The Second Duty Cycle That Doubles the Track Drive Torque Requirement<\/h2>\n

Most D6-class and larger bulldozers carry a rear-mounted ripper \u2014 a single or multi-shank tool that penetrates and fractures rock, frozen ground, or compacted material ahead of the blade. During ripping, the machine moves forward slowly (1.5 to 2.5 km\/h) while the ripper shank drags through the ground at depths of 300 to 800 mm.<\/p>\n

The ripping force adds directly to the drawbar pull requirement: the engine must overcome both the rolling resistance of the tracks AND the shearing resistance of the material being ripped. The combined force can reach 120 to 150% of the dozing-only drawbar pull \u2014 meaning the track drive may operate at 120 to 150% of the sustained dozing torque during ripping passes. This is the load case that determines the peak torque rating of the track drive, while the sustained dozing torque determines the continuous rating.<\/p>\n

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Sizing implication:<\/strong> A bulldozer track drive must be sized for two independent criteria: (1) the continuous torque must accommodate the sustained dozing drawbar pull at 75 to 85% duty cycle, AND (2) the peak torque must accommodate the combined dozing + ripping force at short-duration overload. A track drive that satisfies the dozing torque but cannot handle the ripping peak will trigger the hydraulic relief valve during ripping \u2014 limiting the ripping depth and reducing productivity by 20 to 30%.<\/p>\n<\/div>\n<\/section>\n

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Korea Ever-Power Track Drive Planetary Gearboxes for Bulldozer Applications<\/h2>\n
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\"ReductorTrack Drive Planetary Gearboxes \u2192<\/a><\/div>\n

18,000 to 255,000 Nm continuous output torque for D3 through D11 class bulldozers. Thermal-rated for sustained dozing duty at 75 to 85% load factor. Extended oil volume options and external cooling ports for mining-class machines.<\/p>\n<\/div>\n<\/div>\n

\"Slewing<\/p>\n
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Slewing Drive for Blade Tilt \u2192<\/a><\/div>\n

Precision slewing drives for bulldozer blade tilt, angle adjustment, and GPS-guided grading systems requiring controlled rotational positioning of the blade assembly.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Track Drive Planetary Gearbox for Bulldozers \u2014 Frequently Asked Questions<\/h2>\n
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Why do bulldozer track drives fail faster than excavator track drives at the same torque rating?<\/h3>\n

Duty cycle. An excavator track drive operates at full torque for 5 to 15% of each operating hour \u2014 the remaining time the machine is stationary while digging and swinging. A bulldozer track drive operates at 60 to 85% of rated torque for 60 to 85% of each operating hour. The cumulative heat load, bearing fatigue cycles, and gear tooth contact stress hours are 4 to 8 times higher on the bulldozer at the same torque. This is why a bulldozer track drive rated at 40,000 Nm should be derated to 70 to 75% of the catalogue rating for sustained dozing service \u2014 or alternatively, specified one size larger than the torque calculation alone would suggest.<\/p>\n<\/div>\n

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What oil temperature is considered safe for continuous bulldozer operation?<\/h3>\n

Below 95 degrees C is the target for standard mineral gear oil (75W-90 GL-5). Between 95 and 110 degrees C, the oil viscosity decreases but remains functional \u2014 monitor closely and reduce push depth or allow cooling pauses. Above 110 degrees C, the gear tooth oil film is at risk of failure and sustained operation should be avoided. For tropical or desert sites where ambient temperatures exceed 40 degrees C, specify synthetic gear oil (rated to 120 degrees C continuous) and increase the oil change frequency to 750 hours. Monitor oil temperature with a surface-contact thermocouple on the housing or an infrared thermometer at the end of each push pass.<\/p>\n<\/div>\n

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Should I specify a larger track drive for a bulldozer than the torque calculation indicates?<\/h3>\n

Yes \u2014 this is standard practice. The thermal rating of a track drive is not the same as the mechanical torque rating. A gearbox rated for 42,000 Nm peak may only sustain 30,000 to 35,000 Nm continuously at the 75 to 85% duty cycle that bulldozer service demands. If the sustained torque calculation yields 37,000 Nm, specify the next size up \u2014 a 55,000 Nm class unit \u2014 to ensure the thermal capacity accommodates the sustained load. This upsizing costs 10 to 15% more in initial procurement but extends the service life by 40 to 60% in bulldozer applications.<\/p>\n<\/div>\n

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How does ripping affect the track drive differently from dozing?<\/h3>\n

Ripping adds 20 to 50% more drawbar pull than dozing alone \u2014 the ripper shank shearing through rock or frozen ground produces a reaction force that the tracks must overcome in addition to the rolling resistance. The ripping pass is typically shorter (15 to 40 metres vs 30 to 120 metres for dozing) but at higher torque. The track drive must handle the ripping peak without triggering the hydraulic relief valve, which would limit ripping depth and reduce productivity. Size the peak torque rating for the combined dozing + ripping force, and the continuous rating for the dozing-only sustained load.<\/p>\n<\/div>\n

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What is the typical service life of a bulldozer track drive compared to an excavator?<\/h3>\n

Bulldozer: 6,000 to 10,000 hours for standard earthmoving, 4,000 to 7,000 hours for heavy ripping and mining push. Excavator: 8,000 to 12,000 hours for standard construction, 5,000 to 8,000 hours for demolition and mining. The bulldozer service life is 20 to 30% shorter at the same torque class because of the sustained thermal loading. Oil quality management \u2014 correct viscosity, timely oil changes, temperature monitoring \u2014 has a proportionally larger effect on bulldozer track drive life than on any other track drive application.<\/p>\n<\/div>\n

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Does Korea Ever-Power supply bulldozer track drives with external cooling provisions?<\/h3>\n

For mining-class machines (D10 and D11 equivalents), Korea Ever-Power offers track drive housings with machined ports for external oil circulation cooling. The cooling circuit connects to the machine hydraulic oil cooler, maintaining the final drive oil temperature below 90 degrees C even during continuous heavy-duty dozing in tropical conditions. For D3 through D9 class machines, the standard enlarged-housing design with increased fin area provides adequate thermal capacity without external cooling. Contact Korea Ever-Power application engineering with your machine class and site ambient temperature for a thermal suitability assessment.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Bulldozer Track Drive \u2014 Sized for Sustained Duty, Not Just Peak Torque<\/div>\n

Korea Ever-Power bulldozer track drive planetary gearboxes are thermal-rated for sustained dozing duty at 75 to 85% load factor \u2014 not just peak mechanical torque. Provide your dozer model, operating weight, and site conditions for a thermal suitability assessment and cross-reference recommendation at no charge.<\/p>\n<\/div>\n

View Track Drive Range \u2192<\/a><\/p>\n
sales@planetary-gearboxes.com<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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

Application Engineering \u00b7 Track Drives \u00b7 Bulldozers Track Drive Planetary Gearbox for Bulldozers \u2014 Where Sustained Torque Matters More Than Peak Torque An excavator generates peak torque for seconds during a pivot. A bulldozer generates near-peak torque for minutes during every push pass. This sustained-load duty cycle \u2014 80 to 100% of rated torque, continuously, […]<\/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-1029","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/posts\/1029","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/comments?post=1029"}],"version-history":[{"count":2,"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/posts\/1029\/revisions"}],"predecessor-version":[{"id":1035,"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/posts\/1029\/revisions\/1035"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/media?parent=1029"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/categories?post=1029"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/es\/wp-json\/wp\/v2\/tags?post=1029"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}