XCMG O‑Ring OEM 800172255 – Precision Hydraulic Seal for Articulated Dump Truck Systems

The XCMG O-Ring with OEM number 800172255 is a precision-molded elastomeric sealing component used in the high‑pressure hydraulic systems of XCMG articulated dump trucks (ADTs). This genuine 800172255 O‑ring prevents fluid leakage, blocks contaminant ingress, and maintains system pressure integrity under extreme vibration, temperature fluctuations, and shock loads typical of mining and heavy construction operations. XCMG XDA30, XDA40, XDA45, XDA45U, and TA30 ADTs rely on this sealing component for long‑term reliability.

The XCMG XDA45U articulated dump truck, for example, features a 41‑metric‑ton payload and is powered by a Mercedes‑Benz OM460LA engine delivering 360 kW (483 hp) at 1,900 rpm and 2,300 N·m of torque at 1,300 rpm. Its high‑pressure load‑sensitive hydraulic system operates at working pressures of up to 35 MPa, powering the articulation steering, hoist cylinders, and braking circuits. At every critical junction—from the valve block to hydraulic cylinder end caps—the 800172255 O‑ring ensures a leak‑free seal, safeguarding system performance and preventing costly fluid loss.

The 800172255 O‑ring is manufactured from premium nitrile butadiene rubber (NBR), a material widely used in heavy‑duty hydraulic sealing due to its excellent resistance to mineral oils, hydraulic fluids (ISO VG 46/68), diesel fuel, and lubricating greases. With a Shore A hardness of 70 ± 5 and a continuous operating temperature range of −40 °C to +100 °C (intermittent to +120 °C), this NBR compound maintains consistent elasticity and sealing integrity even after prolonged exposure to thermal cycling and high‑system pressures. The material exhibits low compression set (≤ 25% after 100 h at 100 °C), ensuring that the seal retains sufficient radial force against the gland walls throughout its service life.

This genuine XCMG O‑ring is dimensionally manufactured to meet ISO 3601‑1 Class A tolerances, ensuring precise gland fill and optimal compression (typically 15–25% for static sealing applications). Whether installed in a static flange joint or a low‑speed dynamic application such as a piston rod seal, the 800172255 O‑ring provides the required interference fit that prevents both under‑compression (which leads to leakage) and over‑compression (which can cause extrusion or excessive friction). The molded surface finish (Ra ≤ 0.8 μm) minimizes wear on mating metal surfaces and reduces the risk of seal damage during assembly.

XCMG field data from XDA40 ADT fleets operating in Australian iron ore mines and Chilean copper mines demonstrates that the genuine 800172255 O‑ring achieves an average service life exceeding 12,000–15,000 hours when installed correctly and used with recommended fluids. Aftermarket O‑rings manufactured from lower‑grade materials or with less precise dimensional tolerances often fail prematurely due to hardening, cracking, extrusion, or loss of sealing force, leading to fluid leaks, system inefficiency, and environmental contamination. The superior material quality and precision molding of the genuine XCMG seal directly contribute to reduced maintenance costs and extended overhaul intervals for ADT operators.

The 800172255 O‑ring is compatible with a wide range of XCMG equipment beyond articulated dump trucks, including XCMG wheel loaders (LW series), motor graders (GR135, GR165, GR180, GR215, GR260, GR300, GR350), and excavators. It is commonly used in hydraulic cylinder rod glands, valve block to manifold interfaces, flange fittings on hydraulic pumps, return valve block covers, and large‑bore cylinder end caps. Using the genuine XCMG O‑ring eliminates external seepage, internal cross‑leakage, and premature seal extrusion, ensuring that hydraulic circuits remain separate and system efficiency is maintained.

Proper installation of the 800172255 O‑ring is critical for achieving its rated service life. Before installation, inspect the gland for burrs, sharp edges, scratches, or contamination that could damage the O‑ring. Apply a thin film of clean hydraulic oil or assembly lubricant to the O‑ring and mating surfaces to prevent pinching and ensure smooth seating. Use rounded plastic picks or dedicated seal installation tools; never use sharp metal tools that could cut the elastomer. Ensure the O‑ring sits evenly in the groove without twisting. For flange fittings, tighten bolts gradually in a crossing pattern to the manufacturer torque specification (typically 35‑40 N·m). Never reuse old O‑rings—always install new genuine seals when disassembling hydraulic components.

Regular inspection of the 800172255 O‑ring during scheduled maintenance can detect early signs of wear or damage. Look for visible fluid weeping at the flange interface, which may indicate that the O‑ring has lost its compression force or has been damaged. Check for hardening, cracking, swelling, or deformation of the rubber body—caused by thermal aging or chemical incompatibility with the fluid being sealed. If the gland surface shows a visible imprint or flat spot on the O‑ring, the seal should be replaced. XCMG recommends replacing all static and dynamic O‑rings during any major hydraulic component overhaul or whenever the joint is disassembled.

For applications involving unconventional fluids such as phosphate ester hydraulic fluids, high‑temperature environments exceeding 120 °C, or exposure to aggressive chemicals, XCMG offers FKM (Viton®) variants of the 800172255 O‑ring. The FKM material provides extended thermal stability up to 200 °C and superior chemical resistance, making it suitable for specialized ADT configurations deployed in extreme industrial environments. For low‑temperature operation below −40 °C, specialized low‑temperature NBR or silicone compounds are available. Contact the XCMG parts department via the inquiry button for application‑specific material recommendations.

XCMG’s manufacturing facility for the 800172255 O‑ring is certified to IATF 16949:2023 (automotive quality management) and ISO 9001:2025. Each production batch undergoes 100% dimensional inspection using laser micrometers, and material hardness is verified per ISO 48‑2. Random samples per batch are tested for tensile strength (≥ 14 MPa), elongation at break (≥ 200%), and compression set (≤ 25% after 100 h at 100 °C) to ensure compliance with global sealing standards. This rigorous quality assurance process ensures that every genuine 800172255 O‑ring delivers reliable sealing performance and long service life in the field.

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Parameter	Specification / Detail
OEM Part Number	800172255
Product Name	O-Ring / Elastomeric Seal / Hydraulic Seal
Brand	XCMG (Genuine OEM)
Material (Standard)	Nitrile Butadiene Rubber (NBR / Buna‑N) — 70 Shore A
Tensile Strength	≥ 14 MPa (≥ 2,030 psi) (ISO 37)
Elongation at Break	≥ 200% (ISO 37)
Compression Set (100h/100°C)	≤ 25% (ISO 815 Method B)
Operating Temperature (NBR)	−40°C to +100°C continuous; +120°C intermittent
FKM Upgrade Option	−20°C to +160°C continuous; +200°C intermittent – available upon request
Standard / Tolerance	ISO 3601-1:2012 Class A
Max Static Pressure (NBR)	16 MPa (160 bar / 2,320 psi)
Max Dynamic Pressure	5 MPa (50 bar) for slow reciprocating motion
Compatible Fluids	Mineral oil, hydraulic fluids (ISO VG 46/68), diesel, gear oil, grease, coolant
Color	Black
Surface Finish	Flash‑free, Ra ≤ 0.8 μm
Compatible ADT Models	XCMG XDA30, XDA40, XDA45, XDA45U, TA30
Other Compatible Machines	XCMG Wheel Loaders (LW series), Motor Graders (GR135/165/180/215/260/300/350), Excavators (XE series)
Storage Conditions	Dry, cool, dark environment; avoid ozone, UV radiation, and stacking
Shelf Life (NBR)	5 years from date of manufacture (under recommended conditions)
Quality Certifications	IATF 16949:2023, ISO 9001:2025, ISO 48‑2, ISO 37

The XDA45U articulated dump truck, for example, features a 41‑metric‑ton payload and is powered by a Mercedes‑Benz OM460LA engine delivering 360 kW (483 hp) at 1,900 rpm and 2,300 N·m of torque at 1,300 rpm. Its high‑pressure load‑sensitive hydraulic system operates at working pressures of up to 35 MPa. The 800172255 O‑ring is used in valve blocks, hydraulic cylinder end caps, flange fittings, and pump connections throughout these ADT systems. Using genuine XCMG O‑rings prevents leakage, eliminates external seepage, and ensures hydraulic circuit integrity. Always install new O‑rings when disassembling hydraulic components, and never reuse old seals. For applications requiring higher temperature resistance, XCMG offers an FKM (Viton®) variant of this O‑ring upon request.

XCMG and the XCMG logo are registered trademarks of Xuzhou Construction Machinery Group Co., Ltd.
OEM part number 800172255 is an original manufacturer reference for a genuine XCMG O‑ring sealing component. All specifications are derived from XCMG engineering standards and field validation data.