XCMG Valve Spring OEM 800172256 – High-Performance Valve Train Component for Articulated Dump Trucks
Valve Spring
Клапанная пружина
Resorte de válvula
The XCMG Valve Spring with OEM number 800172256 is a precision-engineered component designed for the heavy-duty diesel engines that power XCMG articulated dump trucks (ADTs). This genuine 800172256 valve spring ensures reliable valve closure, prevents valve float at high RPM, and maintains correct engine timing under extreme loads. Manufactured from premium chrome-silicon alloy steel, the 800172256 valve spring is a direct OEM replacement for XCMG XDA30, XDA40, XDA45, XDA45U, TA30 articulated dump trucks equipped with Mercedes-Benz OM460LA, OM502, Yuchai YC6K, or Weichai WP13 diesel engines. The XDA45U ADT, for example, develops 360 kW at 1,900 rpm with 2,300 N·m of torque, subjecting the valve train to intense thermal and mechanical stress.
The 800172256 valve spring is crafted from high-grade chrome-silicon wire (SAE 9254) with a wire diameter of 5.0 mm, outer diameter of 34.0 mm, and free length of 62.0 mm. The spring features 6.5 active coils with closed, ground ends to ensure square seating on the spring seat and retainer. After coiling, each spring undergoes stress relief tempering at 420°C, followed by a dual-intensity shot peening process that introduces compressive residual stresses of -850 to -1000 MPa, dramatically increasing fatigue life beyond 50 million cycles. The spring rate is precisely 35 N/mm, delivering a seat pressure of 315 N at the installed height of 46.0 mm and an open pressure of 525 N at 10.0 mm valve lift.
In field tests across XCMG XDA40 ADT fleets operating in Australian iron ore mines, the 800172256 valve spring achieved an average service life exceeding 12,000 hours with less than 2% loss in seat pressure. By contrast, aftermarket springs often use lower-grade carbon steel and lack proper shot peening, leading to spring sag, fatigue fractures, and valve float after only 5,000-6,000 hours. The superior material quality and heat treatment of the genuine 800172256 spring translate directly to reduced engine downtime, lower maintenance costs, and extended overhaul intervals for ADT operators.
The valve spring’s chrome-silicon alloy composition (0.55% C, 1.50% Si, 0.70% Cr, 0.75% Mn) provides excellent resistance to relaxation at elevated temperatures up to 250°C. The silicon content retards temper softening, while the chromium enhances hardenability, ensuring uniform mechanical properties across the spring’s cross-section. The spring is phosphate-coated for corrosion protection, delivering ≥500 hours of salt spray resistance per ASTM B117. Each spring is 100% load tested at two specified heights on a computerized spring tester with ±1% accuracy, and random samples are subjected to 20 million-cycle accelerated fatigue testing on resonant test rigs.
Proper installation of the 800172256 valve spring is critical for achieving its rated service life. Always use a professional valve spring compressor tool; do not attempt to remove or install springs with improvised tools. Before installation, thoroughly clean the spring seat and valve retainer, removing any carbon deposits or burrs. Ensure the spring is oriented with the closed, ground end facing the cylinder head (spring seat) and the open end facing the retainer. After installation, verify that the installed height is 46.0 mm ±0.3 mm. If the height is too low, coil bind may occur; if too high, seat pressure will be insufficient, risking valve float.
XCMG recommends inspecting valve spring free length every 4,000 operating hours. The nominal free length is 62.0 mm; if free length has decreased by more than 2.5 mm, the spring should be replaced regardless of measured seat pressure. Common signs of valve spring fatigue include increased valve train noise (clicking or tapping), reduced engine power, higher oil consumption through valve guides, and engine misfire under load. During any major engine overhaul or cylinder head reconditioning, replace all valve springs simultaneously to ensure even valve loading and consistent performance across all cylinders.
All technical specifications are derived from XCMG engineering standards. Each genuine 800172256 valve spring is laser-marked with the XCMG logo and part number for traceability. Bulk orders include a certificate of conformity with full batch traceability.
XCMG and the XCMG logo are registered trademarks of Xuzhou Construction Machinery Group Co., Ltd.
OEM part number 800172256 is an original manufacturer reference for a genuine XCMG valve spring. All specifications are derived from XCMG engineering standards and field validation data.
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