The genuine XCMG starter motor with OEM number 800172772 is a heavy‑duty planetary gear reduction starter engineered for Mercedes‑Benz OM460LA diesel engines in XCMG articulated dump trucks. This 24V starter delivers instant, reliable cranking even at sub‑zero temperatures, ensuring your ADT starts first time in the harshest mining environments.
The 800172772 starter motor features a planetary gear reduction system that multiplies armature torque by a factor of 4.5:1. This allows a smaller, lighter motor to deliver over 200 N·m to the pinion, easily spinning the 12.8‑litre OM460LA diesel engine at cranking speeds above 200 rpm. The permanent magnet design eliminates heavy field coils, reducing heat generation and increasing overall efficiency.
The integrated solenoid performs two critical functions: it engages the pinion with the flywheel ring gear via a shift lever, and it closes the heavy contacts to supply battery current to the motor. This pre‑engaged design prevents pinion grinding and ensures a clean, quiet start every time. The solenoid contacts are made from silver‑alloy, rated for over 200,000 cycles without welding.
The starter motor housing is made of heavy‑duty cast aluminium with a zinc‑nickel coating, providing ≥500 h salt spray resistance per ASTM B117. The armature shaft is supported by ball bearings at both ends, and the commutator is mica‑undercut for long brush life. High‑copper‑content carbon brushes ensure low electrical resistance and minimal sparking.
All external fasteners are grade 10.9 and treated for corrosion resistance. The electrical terminals are sealed with weatherproof boots, and the entire unit is rated IP67 – dust‑tight and protected against temporary immersion. This makes the 800172772 starter ideal for pressure washing and operation in wet, muddy mine sites.
The 800172772 starter is a direct replacement for the original equipment starter on all XCMG articulated dump trucks equipped with the Mercedes‑Benz OM460LA engine. Models include XDA30, XDA40, XDA45U, XDA60E, and XDA70. The mounting flange uses two M12 studs on a SAE standard pattern, and the pinion gear engages with the flywheel’s 146‑tooth ring gear. Installation is straightforward: remove the old starter, transfer the heat shield (if present), and bolt the new unit in place.
The 4‑pole solenoid has two terminals: a large M8 stud for the battery cable (terminal 30) and a small spade terminal for the start signal (terminal 50). Electrical connections match the original wiring harness, making replacement a plug‑and‑play operation. Always use the supplied mounting bolts and torque to 55 Nm.
Independent testing has demonstrated that the 800172772 starter motor achieves over 100,000 start cycles with no measurable wear. Cold cranking tests at -40°C showed a cranking speed of 210 rpm, well above the 150 rpm required for reliable ignition. Vibration endurance testing (20 g RMS, 10–2000 Hz, 40 hours) confirmed no loosening or internal damage.
In field trials across Australian iron ore mines and Canadian Arctic operations, the 800172772 starter reduced no‑start incidents by 85% compared to aftermarket units. The planetary gears remained quiet and smooth after 12,000 operating hours, and the solenoid showed no signs of contact erosion.
Counterfeit starter motors often use cheap magnets that demagnetise at high temperature, causing slow cranking and hard starting. They may also have undersized solenoids that weld contacts, leaving the starter engaged and causing catastrophic damage to the flywheel ring gear. Genuine XCMG 800172772 starters are 100% dynamometer‑tested and come with a 12‑month / 100,000‑start warranty.
Each unit is laser‑etched with the XCMG part number and batch code, and packaging includes a holographic authentication sticker. By insisting on genuine XCMG parts, you protect your ADT’s electrical system, reduce downtime, and maintain resale value.
