{"id":1561,"date":"2026-04-13T08:42:48","date_gmt":"2026-04-13T08:42:48","guid":{"rendered":"https:\/\/planetarygeardrive.top\/?p=1561"},"modified":"2026-04-13T08:50:51","modified_gmt":"2026-04-13T08:50:51","slug":"how-to-select-an-underground-lhd-gearbox-sandvik-epiroc-and-caterpillar-explained","status":"publish","type":"post","link":"https:\/\/planetarygeardrive.top\/fa\/application\/how-to-select-an-underground-lhd-gearbox-sandvik-epiroc-and-caterpillar-explained\/","title":{"rendered":"How to select an underground LHD gearbox? Sandvik, Epiroc, and Caterpillar explained"},"content":{"rendered":"
\n
\n

Industry Application \u00b7 Underground Hard Rock Mining<\/p>\n

Underground LHD Gearbox: Wheel Drive Specification for Load Haul Dump Equipment in Hard Rock Tunnels<\/h2>\n

The underground LHD gearbox<\/strong> operates in an environment that combines the highest shock loading in the mobile mining equipment category with near-zero access for maintenance between planned shutdowns. A 10-tonne LHD bucket engagement against a blasted muck pile generates front axle wheel drive torque spikes of 3\u20135\u00d7 the calculated tractive torque \u2014 and this spike occurs 200\u2013400 times per shift, every shift, for the machine’s 15,000-hour service life target. Below this harsh environment banner, we break down the actual drivetrain architecture, brand-specific specifications, and maintenance protocols required to keep underground production moving.<\/p>\n

Temp: \u22125\u00b0C to +45\u00b0C underground<\/span>
\nRock dust + diesel fumes<\/span>
\nShock factor \u00d73\u20135 per bucket fill<\/span>
\nIP67 minimum \u2014 water spray from rock faces<\/span><\/div>\n<\/div>\n<\/div>\n

<\/p>\n

\n

LHD Drive Architecture \u2014 How the Wheel Planetary Gearbox Fits in Underground Tramming<\/h2>\n

A load haul dump planetary wheel drive<\/strong> (LHD or Scooptram) is an articulated wheel loader designed exclusively for underground tunnel operation. The machine loads broken ore or waste rock from a blasted muck pile (Load), carries it along the tunnel (Haul), and tips it into an ore pass or underground crusher feed (Dump). The machine articulates at the centre frame joint to negotiate tight tunnel curves \u2014 minimum turning radius for a 10-tonne LHD is typically 8\u201310 metres inside radius, driven by the short wheelbase and the articulation angle of up to 40\u00b0 each direction. This articulation places significant lateral thrust loads on the wheel hub gearboxes during loaded turns, requiring a high-capacity output bearing arrangement (typically tapered roller bearings with >150,000-hour L10 life).<\/p>\n

Each wheel axle has its own planetary wheel drive gearbox integrated into the wheel hub \u2014 essentially a compact version of a large excavator track drive, adapted for the wheel-mounted configuration with a hollow output shaft that carries the wheel rim. The torque path in a modern hydrostatic LHD is: diesel engine \u2192 variable displacement pump \u2192 wheel motor (piston type) \u2192 planetary hub gearbox \u2192 wheel. The wheel planetary gearbox is the final torque amplification step, typically providing a 4\u20138:1 ratio reduction to convert the high-speed wheel motor output to low-speed high-torque wheel rotation. In hydrostatic LHDs, the wheel motor itself is a high-speed axial piston unit (max 4,000\u20135,000 rpm), so the planetary hub must reduce that speed while multiplying torque to achieve the wheel drawbar pull required for muck pile engagement \u2014 typically 35,000\u201360,000 N drawbar pull for a 15-tonne machine.<\/p>\n

The LHD tram drive gearbox<\/strong> on larger machines (15\u201320 tonne class) uses 3-stage planetary hubs with output torques in the 50,000\u2013120,000 Nm range per wheel position. The machine’s four wheel drives operate simultaneously during bucket fill \u2014 all four wheels spinning against the muck pile with maximum tractive effort, often with the bucket teeth penetrating the muck pile at full throttle. The simultaneous loading of all four hubs creates the highest sustained torque condition the gearboxes experience and is the primary design load for bearing life calculation. Unlike surface loaders, underground LHDs cannot rely on inertia to break into the pile \u2014 they must develop maximum torque from near-zero wheel speed, making the hub gearbox’s starting torque capacity critical.<\/p>\n<\/div>\n

<\/p>\n

\n

Major LHD Models \u2014 Gearbox Reference Data & Underground Compatibility<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Model<\/th>\nBucket Cap.<\/th>\nWheel Torque (Nm)<\/th>\nStages<\/th>\nDrive Type<\/th>\n<\/tr>\n<\/thead>\n
Sandvik LH517<\/td>\n17 t<\/td>\n~85,000 Nm<\/td>\n3<\/td>\nHydrostatic<\/td>\n<\/tr>\n
Epiroc ST14 (ex-Atlas Copco)<\/td>\n14 t<\/td>\n~70,000 Nm<\/td>\n3<\/td>\nHydrostatic<\/td>\n<\/tr>\n
Caterpillar R1700<\/td>\n15 t<\/td>\n~75,000 Nm<\/td>\n3<\/td>\nHydrostatic<\/td>\n<\/tr>\n
Komatsu WX06<\/td>\n6 t<\/td>\n~32,000 Nm<\/td>\n2\u20133<\/td>\nHydrostatic<\/td>\n<\/tr>\n
Sandvik LH410 (electric)<\/td>\n10 t<\/td>\n~52,000 Nm<\/td>\n3<\/td>\nElectric \/ hydrostatic<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Reference values only. Always confirm from machine service manual or gearbox nameplate before ordering replacement.<\/p>\n

The Sandvik LH517 gearbox<\/strong> and the Atlas Copco Scooptram drive gearbox<\/strong> (now Epiroc ST series) are the two most widely deployed underground LHD wheel drives in Australian and Canadian hard rock mines. Both use a 3-stage planetary arrangement with a hollow output shaft that accepts the wheel rim mounting flange. The critical dimension that varies between brands is the input shaft spline (which interfaces with the hydrostatic wheel motor) and the wheel flange bolt circle. Sandvik typically uses a DIN 5480 spline; Epiroc uses a proprietary involute spline. Our S series planetary gearbox can be supplied with either spline configuration when the machine model and wheel motor part number are provided.<\/p>\n<\/div>\n

\"underground<\/p>\n

\n

Underground LHD Gearbox Service \u2014 500-Hour Oil Change is Non-Negotiable<\/h2>\n

The underground mining wheel reducer<\/strong> oil change interval on most LHD OEM service schedules is 1,000 hours. For machines operating in hard rock underground environments in Australia and Canada, where rock dust concentrations are high and shock loading is continuous, 500 hours is the correct interval<\/strong>. The reasoning: the shock loading from muck pile engagement generates metallic wear debris at a rate approximately 2\u00d7 higher per hour than a surface wheel drive of equivalent torque class. Combined with higher ambient dust concentration in underground tunnels (shaft seals on LHD hubs are lip-type and cannot filter sub-5-micron rock dust), oil contamination accelerates dramatically faster underground. Analysis of used oil from 15-tonne LHD wheel hubs shows iron particle counts exceeding 200 ppm at 800 hours \u2014 the manufacturer’s alarm threshold for these gearboxes is 80 ppm.<\/p>\n

The more common failure in the field is running the machine until hub failure occurs mid-shift in a remote underground level \u2014 at which point the machine may require partial disassembly to remove from the level, and production loss can run to 24\u201348 hours. Planned replacement at the oil analysis-indicated wear threshold prevents this unplanned scenario. The actual gearbox removal procedure for most Sandvik and Epiroc LHDs: wheel off (45 min), hub cap and bearing locknut removal (30 min), gearbox extraction using a purpose-built puller (1 hour), cleaning and inspection of the wheel motor spline (30 min), reassembly with new gearbox (1.5 hours), wheel refit (45 min). Total per hub: 4.5 hours for two technicians. Cost of unplanned failure mid-shift: 8\u201312 hours of lost production at an underground gold mine (A$25,000\u201340,000 per hour of downtime) plus emergency labour.<\/p>\n

\n

\u26cf\ufe0f Common failure modes in underground LHD planetary hubs:<\/p>\n