The genuine XCMG intermediate gear 800172346 is a precision‑engineered drivetrain component used in the front gear train assembly of Mercedes‑Benz OM460LA diesel engines powering XCMG articulated dump trucks. This high‑strength intermediate gear transmits rotational force between the crankshaft gear and the camshaft drive gear, while also driving auxiliary components such as the high‑pressure fuel pump and power steering pump. Manufactured from case‑hardened alloy steel with precision‑ground gear teeth, the 800172346 intermediate gear ensures reliable torque transfer and timing accuracy under extreme operating conditions.
Engineered to withstand torsional vibrations and high cyclic loads, the 800172346 intermediate gear features induction‑hardened gear teeth (58–62 HRC) with a ground finish of Ra ≤0.4 µm. The gear incorporates a precision‑machined bearing journal and an integral flange for mounting the fuel pump drive gear. The gear is manufactured from high‑quality 20MnCr5 case‑hardening steel, carburized to a case depth of 0.8–1.2 mm, providing exceptional wear resistance while maintaining a tough, ductile core that absorbs shock loads. The gear is dynamically balanced to minimise vibration and reduce noise in the front gear train assembly.
The 800172346 intermediate gear is fully compatible with XCMG articulated dump trucks including the XDA30, XDA40, XDA45U, XDA60E, and XDA70 series. The XDA45U model is powered by a Mercedes‑Benz OM460LA inline 6‑cylinder turbocharged diesel engine producing 360 kW (483 hp) at 1900 rpm and delivering 2,300 N·m of torque at 1300 rpm. The front gear train drives the camshaft, high‑pressure fuel pump, power steering pump, water pump, and air compressor—all reliant on the intermediate gear for correct phasing and reliable power transmission.
The following table provides complete technical specifications for the XCMG 800172346 intermediate gear, meeting all original equipment manufacturer standards for the Mercedes‑Benz OM460LA engine platform in articulated dump truck applications.
The 800172346 intermediate gear is manufactured from vacuum‑degassed 20MnCr5 case‑hardening steel, selected for its excellent core toughness, fatigue resistance, and ability to form a deep, uniform carburised case. The steel contains controlled levels of chromium (1.0–1.3%), manganese (1.0–1.3%), and carbon (0.17–0.22%) to achieve the optimal balance of surface hardness and core ductility. The forging process aligns the grain flow with the gear geometry, increasing fatigue strength by up to 30% compared to machined‑from‑bar stock.
After forging, the gear blank undergoes a multi‑stage carburising process at 880–920°C for 8–10 hours, achieving a case depth of 0.8–1.2 mm. The gear is then quenched in high‑quality oil and tempered at 160–180°C to reduce residual stresses while maintaining a surface hardness of 58–62 HRC and a core hardness of 35–42 HRC. The gear teeth are then precision‑ground using a high‑speed CBN grinding wheel to achieve a surface finish of Ra ≤0.4 µm and profile accuracy of ISO 1328 grade 6. The bearing journal is centreless ground to ISO h6 tolerance.
The 800172346 intermediate gear is 100% magnetic particle inspected (MPI) to detect any surface cracks or grinding burns. Dynamic balancing is performed on a Schenck balancing machine, with residual unbalance held to ≤6 g·mm per ISO 21940-11 G6.3. CMM dimensional verification ensures that tooth profile, lead, pitch error, and journal diameter are within XCMG’s strict OEM tolerances. Each gear is coated with a zinc‑phosphate anti‑corrosion layer and oil dip, then individually packaged to prevent damage.
The OEM intermediate gear 800172346 is a direct replacement for original equipment on the full range of XCMG articulated dump trucks powered by Mercedes‑Benz OM460LA diesel engines. The XDA45U model—a 41‑tonne payload articulated dump truck—uses this gear in the front gear train assembly. The OM460LA engine features a gear‑driven camshaft, high‑pressure fuel pump, power steering pump, water pump, and air compressor. The intermediate gear transfers torque from the crankshaft gear to the camshaft drive gear while also driving the fuel pump via a bolted flange.
The XDA45U’s permanent all-wheel-drive 6×6 system with 100% lockable differentials allows the vehicle to tackle slopes of up to 30°. The engine operates under high torque (2,300 N·m at 1300 rpm) and high cylinder pressures exceeding 220 bar, generating significant torsional vibrations in the gear train. The 800172346 intermediate gear must absorb these vibrations while maintaining precise timing between the crankshaft and camshaft—any tooth wear or backlash increase would affect injection timing and valve operation, leading to reduced power and increased emissions.
Beyond the XDA45U, the 800172346 intermediate gear is also used on the XDA40 (39‑tonne), XDA60E (55‑tonne electric drive ADT), XDA30 (30‑tonne), and XDA70 (65‑tonne). All XCMG articulated haulers utilise the same OM460LA engine architecture, making the 800172346 a standardised component across the fleet. Field data from Australian iron ore mines and Chilean copper operations shows that genuine XCMG intermediate gears maintain tooth integrity for the full 12,000‑hour engine overhaul interval, with no cases of tooth spalling or bearing journal wear reported.
The 800172346 intermediate gear operates in a splash‑lubricated environment within the front gear train housing. Pressurised engine oil is directed to the gear bearing journal through a drilled passage in the housing, creating a hydrodynamic film that supports the gear and prevents metal‑to‑metal contact. The recommended oil viscosity for the OM460LA engine is 15W‑40 API CK‑4 for standard mining climates, or 5W‑30 synthetic for extreme cold conditions. Proper oil level and quality are essential to ensure adequate lubrication of the gear teeth and bearing journal.
The gear train is designed with a specified backlash of 0.10–0.20 mm between meshing gears. Incorrect backlash can result from worn bearings or improper installation, leading to excessive noise (gear rattle) or, in extreme cases, tooth contact fatigue and pitting. The 800172346 intermediate gear is manufactured to exacting tolerances to maintain correct backlash when installed with genuine XCMG bearings and housing components.
During engine operation, the intermediate gear experiences varying torque loads as the camshaft actuates valves and the high‑pressure fuel pump builds pressure. At peak torque (2,300 N·m at 1300 rpm), the gear tooth loading can exceed 2,000 N per millimetre of face width. The case‑hardened surface and precision ground profile of the 800172346 gear ensure that it can withstand these loads without pitting or spalling, even after thousands of hours of operation.
Proper installation of the 800172346 intermediate gear is critical for engine timing accuracy and reliability. Before installation, inspect the gear housing bore and the gear bearing journal for nicks, burrs, or wear. Clean all components thoroughly with solvent and compressed air. The gear must be installed with the correct orientation—timing marks on the gear must align with the marks on the crankshaft gear and camshaft gear as specified in the XCMG workshop manual.
Apply a thin film of clean engine oil to the bearing journal and the housing bore. Slide the intermediate gear onto its shaft or bearing, ensuring it rotates freely with no binding. Install the retaining bolt or circlip as per the engine design, torquing to 150 Nm (111 lb·ft) for the central bolt. After securing the gear, rotate the crankshaft two full revolutions and verify that all timing marks realign—if they do not, the gear has been installed incorrectly and must be repositioned.
If the intermediate gear is being replaced due to tooth wear or bearing failure, also inspect the mating gears (crankshaft gear and camshaft gear) for damage. Worn mating gears should be replaced as a set to prevent accelerated wear of the new gear. After completing the gear train assembly, fill the engine with the specified oil and prime the lubrication system before starting. Listen for any abnormal gear noise during initial run‑up; a high‑pitched whine may indicate incorrect backlash or bearing preload.
The 800172346 intermediate gear has undergone extensive validation in accordance with ISO 6336 (gear load capacity standards). Tooth bending fatigue testing at 2,500 N·m for 10⁷ cycles produced no crack initiation or permanent deformation. Surface durability testing (pitting resistance) under a contact stress of 1,500 MPa for 5 × 10⁷ cycles resulted in a pitting area of less than 2% of the tooth flank, well below the 5% limit. Wear testing in a lubricated gear test rig for 1,000 hours at 2,100 rpm showed tooth thickness loss of less than 0.01 mm.
Field trials on XCMG XDA45U articulated dump trucks operating in Australian iron ore mines (ambient temperatures up to 45°C, severe dust) and Indonesian coal mines (high humidity, abrasive coal dust) involved 20 vehicles over 18 months. The genuine 800172346 intermediate gears showed no tooth pitting, spalling, or journal wear after 12,000 operating hours. Aftermarket gears tested under identical conditions exhibited tooth surface fatigue (micro‑pitting) by 6,000 hours and bearing journal wear exceeding 0.05 mm, leading to increased gear noise and timing drift.
Corrosion resistance testing per ASTM B117 confirmed that the zinc‑phosphate coating protected the gear from red rust after 200 hours of salt spray exposure, ensuring the gear remains corrosion‑free during storage in humid environments. Thermal cycle testing between -40°C and +150°C for 500 cycles produced no dimensional changes or coating delamination.
Aftermarket intermediate gears pose significant risks to engine reliability, timing accuracy, and safety. Non‑genuine gears are often manufactured from lower‑grade carbon steel or inferior cast iron, lacking the necessary case depth and core toughness. Gear teeth may be cut rather than ground, resulting in rough surfaces (Ra > 1.0 µm) that cause rapid wear and noise. The bearing journal may have incorrect dimensions, leading to improper oil clearance and bearing failure. The consequences include tooth pitting and spalling, contaminating the oil system with metal debris, incorrect camshaft timing causing poor performance and valve‑to‑piston contact, gear train noise and vibration, bearing seizure leading to gear train lock‑up and catastrophic engine failure—with repair costs exceeding $15,000 and extended downtime.
Genuine XCMG 800172346 intermediate gears offer full material traceability from certified steel mills, documented carburising and heat treatment records, 100% magnetic particle inspection and CMM verification, dynamic balancing certification, and a 12‑month warranty against manufacturing defects. Each gear is batch‑tested for compliance with XCMG’s OEM specifications for case depth, hardness profile, tooth geometry, journal tolerance, and surface finish. Using genuine XCMG intermediate gears preserves your articulated dump truck’s engine warranty, ensures accurate camshaft and fuel pump timing, and reduces the total cost of ownership.
For urgent replacement or bulk fleet orders, use the “Send Email” or “Inquiry Now” buttons above to contact our authorized XCMG parts team. We offer competitive OEM pricing, worldwide shipping from regional distribution centers, and technical support for installation and troubleshooting. Protect your XCMG articulated dump truck’s engine investment—choose only genuine OEM 800172346 intermediate gears for reliable, long‑lasting performance in the toughest mining environments.
