{"id":1051,"date":"2026-06-23T05:55:35","date_gmt":"2026-06-23T05:55:35","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?p=1051"},"modified":"2026-06-23T05:55:35","modified_gmt":"2026-06-23T05:55:35","slug":"track-drive-planetary-gearbox-for-asphalt-pavers","status":"publish","type":"post","link":"https:\/\/planetary-gearboxes.com\/bs\/track-drive-planetary-gearbox-for-asphalt-pavers\/","title":{"rendered":"Track Drive Planetary Gearbox for Asphalt Pavers"},"content":{"rendered":"
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Korea Ever-Power \u00b7 Application Engineering \u00b7 Road Construction<\/p>\n

Track Drive Planetary Gearbox for Asphalt Pavers \u2014 The Slowest, Hottest, Most Precision-Demanding Final Drive in Construction<\/h1>\n

Two metres per minute. For four hours straight. With a 150-degree heat source one metre away. And if the left track runs 3% faster than the right, the asphalt mat behind the paver shows a visible thickness ridge that fails the highway authority density test. This is the most demanding precision speed application in the entire track drive industry.<\/strong><\/p>\n

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

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Why Asphalt Paver Track Drives Operate Under Conditions No Other Final Drive Encounters<\/h2>\n

An excavator track drive operates at 25 to 44 rpm at the sprocket. A crawler crane operates at 2 to 5 rpm. An asphalt paver track drive planetary gearbox<\/a> operates at 0.1 to 0.8 rpm during paving \u2014 a speed so low that each planet gear completes one revolution every 8 to 60 seconds. At this speed, the hydrodynamic oil film between the planet pin bearing and its roller is at the absolute minimum thickness. The gears are effectively operating in a sustained near-stall condition, for hours, under load.<\/p>\n

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0.1 \u2013 0.8<\/div>\n
rpm at sprocket during paving (vs 25 \u2013 44 rpm on an excavator)<\/div>\n<\/div>\n
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150\u00b0C<\/div>\n
asphalt temperature at the screed \u2014 radiating heat directly onto the track drive housing<\/div>\n<\/div>\n
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<2%<\/div>\n
maximum speed difference between left and right tracks for acceptable mat quality<\/div>\n<\/div>\n
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4 \u2013 8<\/div>\n
hours of continuous ultra-slow paving per shift \u2014 near-stall conditions the entire time<\/div>\n<\/div>\n<\/div>\n

No other tracked machine combines all four of these conditions. A crawler crane operates slowly but is cool and trams for minutes, not hours. A bulldozer is hot from its own exertion but moves at 20 to 40 times the paver speed. The asphalt paver track drive sits in a unique intersection: ultra-low speed, extreme ambient heat, sustained duration, and precision synchronisation \u2014 all at once, all day, every paving day of the season.<\/p>\n<\/section>\n

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Speed Synchronisation \u2014 Why a 3% Mismatch Ruins the Mat<\/h2>\n

The paver screed \u2014 the heated plate that smooths and compresses the asphalt mat \u2014 is towed behind the machine by two long arms. The screed automatically adjusts its attack angle based on the towing force. If the left track runs faster than the right, the machine yaws slightly, the towing geometry changes asymmetrically, and the screed tilts. A 3% speed difference at 3 m\/min paving speed means one side advances 5.4 mm more per minute \u2014 producing a continuous thickness gradient across the mat width. Over a 500-metre paving run, this gradient accumulates into a visible crown offset that fails the straightedge tolerance test.<\/p>\n

The track drive planetary gearbox contributes to speed synchronisation through two mechanisms: gear ratio consistency (left and right drives must have identical ratios within 0.1%) and backlash uniformity (any difference in backlash between the two drives produces a transient speed discontinuity during load changes that the screed cannot follow).<\/p>\n

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Matched-pair specification:<\/strong> Paver track drives should be ordered as matched pairs \u2014 two gearboxes manufactured from the same batch of gears, assembled to the same backlash tolerance, and tested at the same output speed. Replacing a single track drive with an unmatched unit can introduce a ratio or backlash mismatch that produces a mat quality deficiency visible to the highway inspector but invisible to the paver operator.<\/p>\n<\/div>\n<\/div>\n

\"Track<\/p>\n
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Paver track drives are specified and delivered as matched pairs to ensure speed synchronisation within the 2% tolerance required for highway-grade mat quality.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Thermal Environment \u2014 Paving Next to 150-Degree Asphalt Changes Everything About Lubrication<\/h2>\n

The asphalt mix in the hopper and under the screed is delivered at 140 to 170 degrees C. The screed plate itself is electrically or gas-heated to 80 to 120 degrees C to prevent the mix from sticking. The track drives \u2014 mounted at each side of the machine, typically 0.5 to 1.5 metres from the hopper and screed \u2014 absorb radiant and convective heat from these sources throughout the paving day.<\/p>\n

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Heat Source<\/th>\nTemperatura<\/th>\nDistance to Track Drive<\/th>\nEffect on Housing<\/th>\n<\/tr>\n<\/thead>\n
Asphalt hopper<\/td>\n140 \u2013 170\u00b0C<\/td>\n0.5 \u2013 1.0 m<\/td>\n+15 \u2013 25\u00b0C housing rise<\/td>\n<\/tr>\n
Heated screed<\/td>\n80 \u2013 120\u00b0C<\/td>\n1.0 \u2013 1.5 m<\/td>\n+5 \u2013 10\u00b0C housing rise<\/td>\n<\/tr>\n
Fresh-laid asphalt mat<\/td>\n120 \u2013 150\u00b0C<\/td>\n0 m (tracks run on it)<\/td>\n+20 \u2013 35\u00b0C at track shoe<\/td>\n<\/tr>\n
Summer ambient<\/td>\n30 \u2013 45\u00b0C<\/td>\nSurrounding air<\/td>\nOsnovna vrijednost<\/td>\n<\/tr>\n
Combined effect<\/td>\nTrack drive housing reaches 70 \u2013 100\u00b0C during summer paving \u2014 BEFORE internal heat from gear friction is added<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
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Why the external heat matters more than internal heat<\/div>\n

At 0.1 to 0.8 rpm sprocket speed, the track drive generates very little internal friction heat \u2014 perhaps 50 to 200 watts, compared to 5,000 to 10,000 watts in a bulldozer. But the external radiant heat from the asphalt hopper and freshly laid mat raises the housing temperature to 70 to 100 degrees C before internal friction is even considered. On a 40-degree C summer day with full hopper, the track drive oil temperature can reach 110 to 120 degrees C \u2014 approaching the viscosity failure threshold for standard gear oil \u2014 entirely from external heat absorption rather than internal gear friction.<\/p>\n<\/div>\n

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Lubrication at near-stall: boundary regime by default<\/div>\n

At 0.3 rpm sprocket speed through a 100:1 ratio, the planet gears rotate at 30 rpm \u2014 far below the 200 to 500 rpm minimum needed to build a full hydrodynamic oil film on the planet pin bearings. The bearings operate in boundary lubrication regime throughout the paving day: metal-to-metal contact through a thin residual oil film. This is the same condition that a bulldozer track drive experiences during track slip \u2014 except the paver operates in this regime for 4 to 8 hours continuously, not 30 to 90 seconds. EP (extreme-pressure) additive gear oil is mandatory, not optional.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Three Operating Modes \u2014 Why the Paver Track Drive Must Excel at Two Extremes Simultaneously<\/h2>\n

Unlike single-purpose machines (a bulldozer only pushes, a drill rig only trams), an asphalt paver uses its track drives in three distinct modes \u2014 each imposing different demands on the planetary gearbox:<\/p>\n

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Mode 1 \u2014 Paving<\/div>\n
0.5 \u2013 15 m\/min<\/div>\n

Ultra-slow, sustained, hours-long. Speed precision within \u00b12%. Both tracks synchronised. Near-stall bearing conditions. External heat from asphalt. This is the mode that defines the gearbox specification \u2014 torque is moderate, but the speed control, thermal, and lubrication demands are extreme.<\/p>\n<\/div>\n

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Mode 2 \u2014 Truck Exchange<\/div>\n
Stop \u2192 Push \u2192 Resume<\/div>\n

The paver briefly stops while the empty haul truck pulls away and a full truck reverses into the hopper. The paver then pushes the full truck (15 to 25 tonnes) while simultaneously resuming paving speed. This push-start produces the highest torque event of the paving day \u2014 breakaway force plus truck inertia plus paving resistance, all at once.<\/p>\n<\/div>\n

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Mode 3 \u2014 Tramming<\/div>\n
3 \u2013 5 km\/h<\/div>\n

Relocating the paver from one paving lane to another or returning to the plant. Normal tracked vehicle speed, moderate torque, brief duration. The only mode where the track drive operates in normal hydrodynamic lubrication conditions \u2014 providing a brief thermal and mechanical relief from the sustained near-stall of paving mode.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"Track<\/p>\n

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Three Failure Modes Unique to Asphalt Paver Track Drives<\/h2>\n
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1<\/div>\n
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Planet bearing surface damage from sustained boundary lubrication<\/div>\n

The dominant paver-specific failure. At 0.1 to 0.8 rpm sprocket speed, the planet pin bearings operate in boundary lubrication for 4 to 8 hours per paving day \u2014 metal-to-metal contact through a thin EP additive film. Over 500 to 1,000 paving hours, the bearing surfaces develop micro-pitting from the cumulative boundary contact. The pitting grows into spalling, backlash increases, and the left-right speed synchronisation degrades until the mat quality is no longer acceptable. This failure is invisible to the operator \u2014 it manifests only in the highway inspector straightedge test.<\/p>\n

Prevention: Use fully synthetic EP gear oil rated for boundary lubrication service. Change oil at 500-hour intervals (not 1,000 h). Specify track drives with solid bronze bushings instead of needle bearings for paver duty \u2014 bronze tolerates boundary conditions better than hardened steel rollers.<\/div>\n<\/div>\n<\/div>\n
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2<\/div>\n
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Seal degradation from sustained external heat exposure<\/div>\n

The duo-cone seal O-ring on a paver track drive endures sustained temperatures of 70 to 100 degrees C at the housing surface \u2014 not from internal gear friction but from the adjacent asphalt hopper and screed radiation. Standard NBR elastomer O-rings rated for peak 100 degrees C are operating at their continuous upper limit for the entire paving shift. Over two to three paving seasons, the NBR compound hardens, cracks, and loses its recovery force. The seal contact pressure decreases, oil begins weeping past the faces, and the track drive oil level drops \u2014 potentially unnoticed until the bearing runs dry.<\/p>\n

Prevention: Specify FKM (Viton) or HNBR seal O-rings rated for continuous 150 degrees C for paver applications. Standard NBR is inadequate for the thermal environment.<\/div>\n<\/div>\n<\/div>\n
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3<\/div>\n
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Left-right synchronisation loss from uneven backlash growth<\/div>\n

If the left and right track drives are not replaced as a matched pair, the older unit (with more backlash from wear) produces a different transient speed response than the newer unit during load changes \u2014 particularly during truck exchange mode, when the paver transitions from stop to push to paving speed within 10 to 15 seconds. The backlash-induced speed mismatch produces a brief yaw that shifts the screed angle by 0.1 to 0.3 degrees. On a 3-metre screed width, a 0.2-degree tilt produces a 10 mm thickness gradient \u2014 enough to fail a highway density specification.<\/p>\n

Prevention: Always replace paver track drives as matched pairs. Measure backlash on both drives at annual service \u2014 if the difference exceeds 5 arcminutes, replace both.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n
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Korea Ever-Power Track Drives for Paver Applications<\/h2>\n
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\"Track<\/p>\n
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Paver Track Drives \u2192<\/a><\/div>\n

8,000 to 35,000 Nm output torque for small-class through highway-class pavers. Matched-pair delivery with backlash certification. FKM\/HNBR high-temperature seal options. Bronze bushing planet carrier available for sustained boundary-lubrication service.<\/p>\n<\/div>\n<\/div>\n

\"Wheel<\/p>\n
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Wheel Drive for Tyred Pavers \u2192<\/a><\/div>\n

For rubber-tyred paver variants. Same matched-pair synchronisation requirement, different output interface. Korea Ever-Power<\/a> supplies both track and wheel drive options for complete paver fleet coverage.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Track Drive Planetary Gearbox for Asphalt Pavers \u2014 Frequently Asked Questions<\/h2>\n
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Why must paver track drives be replaced as matched pairs?<\/h3>\n

The paving screed is towed by two arms \u2014 one from each side of the machine. Any speed difference between the left and right tracks causes a yaw that tilts the screed. A new track drive (with 8 arcminutes of backlash) paired with a worn drive (with 20 arcminutes) produces different transient speed responses during truck exchanges and speed changes \u2014 translating into a mat thickness gradient of 5 to 15 mm across the screed width. This gradient fails the highway authority straightedge tolerance on most specifications. Matched-pair replacement eliminates this risk.<\/p>\n<\/div>\n

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What oil type is correct for paver track drives?<\/h3>\n

Fully synthetic 75W-90 GL-5 with EP (extreme-pressure) additives \u2014 mandatory, not optional. The sustained boundary lubrication at 0.1 to 0.8 rpm requires EP additives to maintain a protective film between bearing surfaces when the hydrodynamic oil wedge cannot form. Standard mineral oil without EP additives will allow accelerated bearing wear from the first paving day. Change interval: 500 hours for paver duty (not the 1,000 to 2,000 hours typical of excavators) because the sustained high temperature from asphalt radiation accelerates oil oxidation.<\/p>\n<\/div>\n

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What is the typical service life of an asphalt paver track drive?<\/h3>\n

3,000 to 6,000 paving hours for standard highway-class pavers. The service life is limited by bearing surface wear from sustained boundary lubrication and seal degradation from sustained external heat \u2014 not by gear tooth fatigue. The practical replacement trigger is often not mechanical failure but mat quality degradation: when the backlash difference between the two drives exceeds 5 arcminutes, the screed control system can no longer compensate for the speed mismatch, and the mat quality deteriorates below the highway specification.<\/p>\n<\/div>\n

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Can I use an excavator track drive as a replacement on a paver?<\/h3>\n

Not recommended \u2014 even if the torque and mounting dimensions match. An excavator track drive is designed for intermittent duty at 25 to 44 rpm with full hydrodynamic lubrication. A paver track drive must sustain 0.1 to 0.8 rpm in boundary lubrication for hours. The excavator unit uses needle roller planet bearings optimised for hydrodynamic conditions \u2014 these bearings will wear 3 to 5 times faster in the boundary regime of paver service. Paver-specific track drives use solid bronze bushings or specially coated rollers rated for sustained boundary contact. Additionally, the excavator unit will not be backlash-matched to the opposite side drive \u2014 introducing the synchronisation risk described above.<\/p>\n<\/div>\n

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Does Korea Ever-Power supply paver track drives with bronze bushing planet carriers?<\/h3>\n

Yes. Korea Ever-Power offers track drive planetary gearboxes with solid bronze bushing planet carriers as an option for asphalt paver and other sustained-low-speed applications. The bronze bushing eliminates the hydrodynamic-speed dependency of needle roller bearings \u2014 providing consistent bearing performance from 0 rpm to full tramming speed. Available as matched pairs with backlash certification for left-right synchronisation. Specify “paver-grade bronze bushing, matched pair” when ordering for asphalt paver service.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Paver Track Drives \u2014 Matched Pairs, Boundary-Rated, Heat-Resistant<\/div>\n

Korea Ever-Power provides asphalt paver track drive planetary gearboxes as backlash-certified matched pairs from 8,000 to 35,000 Nm. Bronze bushing option, FKM high-temperature seals, and synthetic EP oil specifications for highway-grade mat quality. Provide your paver model for a matched-pair recommendation.<\/p>\n<\/div>\n

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

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

Korea Ever-Power \u00b7 Application Engineering \u00b7 Road Construction Track Drive Planetary Gearbox for Asphalt Pavers \u2014 The Slowest, Hottest, Most Precision-Demanding Final Drive in Construction Two metres per minute. For four hours straight. With a 150-degree heat source one metre away. And if the left track runs 3% faster than the right, the asphalt mat […]<\/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-1051","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts\/1051","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/comments?post=1051"}],"version-history":[{"count":2,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts\/1051\/revisions"}],"predecessor-version":[{"id":1056,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/posts\/1051\/revisions\/1056"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/media?parent=1051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/categories?post=1051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/tags?post=1051"}],"curies":[{"name":"radni list","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}