Genuine XCMG Valve Lock Clip OEM 800172203 – Essential Valve Keeper for ADT Diesel Engines

The XCMG Valve Lock Clip with OEM number 800172203 is a small but mission-critical engine valve train component designed specifically for the heavy-duty diesel engines powering XCMG articulated dump trucks (ADTs). This genuine 800172203 valve lock clip – also known as a valve keeper, valve collet, or valve retainer lock – secures the valve spring retainer to the valve stem, ensuring that the valve remains properly seated and controlled during every single combustion cycle.

The XCMG XDA45U articulated dump truck, for example, develops 360 kW (483 hp) at 1,900 rpm with peak torque of 2,300 N·m at 1,300 rpm, generating extreme cylinder pressures and valve train loads that demand components of the highest integrity[reference:0]. The 800172203 valve lock clip is manufactured from precision-stamped, heat-treated alloy steel that provides exceptional tensile strength, fatigue resistance, and wear durability. This component directly interfaces with the valve stem groove and the spring retainer, and its reliable performance is essential for preventing valve float, spring retainer separation, or catastrophic engine failure.

Directly compatible with XCMG’s XDA series articulated dump trucks including the XDA30, XDA40, XDA45, XDA45U, and TA30 models, the 800172203 valve lock clip is a direct OEM‑fit replacement for Mercedes‑Benz OM460LA and OM502 eight‑cylinder and six‑cylinder diesel engines, as well as Yuchai YC6K and Weichai WP13 powerplants used in XCMG ADT fleets worldwide[reference:1]. The lock clip’s precisely engineered dimensions and taper ensure a seamless fit without modification, reducing installation time and eliminating the risk of improper valve train assembly.

The 800172203 valve lock clip is manufactured from high-quality heat‑treated alloy steel using a precision stamping and forming process. The material is selected for its excellent combination of hardness, toughness, and resistance to wear and fatigue under the high-frequency cyclic loading typical of heavy-duty diesel engine operation. The lock clip’s 7-degree taper angle is precisely ground to provide consistent clamping force on the valve stem when assembled with the spring retainer, ensuring that the valve assembly remains securely locked in place even under extreme operating conditions.

Each XCMG valve lock clip is subjected to stringent quality control measures to ensure it meets the exacting standards required for heavy-duty ADT applications. The clips are 100% visually inspected for surface defects, cracks, or dimensional irregularities, and random samples from each production batch are tested for hardness, tensile strength, and resistance to deformation under load. This rigorous quality assurance process ensures that every genuine 800172203 valve lock clip delivers reliable performance and long service life in the field.

Proper installation of the 800172203 valve lock clip is essential for safe and reliable engine operation. The lock clip is installed as a matched pair – two clips per valve – that engage with the valve stem groove and are retained by the spring retainer. A specialized valve spring compressor tool is required to compress the valve spring, allowing the clips to be positioned correctly in the retainer before spring pressure is released. When installed correctly, the taper of the clips and the retainer create a wedging action that securely locks the assembly in place, with clamping force increasing proportionally with engine speed and valve spring pressure.

Failure of a valve lock clip can lead to catastrophic engine damage, including a dropped valve that can destroy the piston, cylinder head, and even the engine block. Common warning signs of valve lock clip wear or fatigue include irregular engine idle, reduced power output, metallic tapping noises from the valve train, and increased valve clearance measurements during routine adjustment. When these symptoms are observed, immediate inspection and replacement of the lock clips is strongly recommended. XCMG recommends replacing all valve lock clips during any major engine overhaul or cylinder head reconditioning, as well as whenever valve springs are replaced.

XCMG field data from XDA40 ADT fleets demonstrates that the genuine 800172203 valve lock clip achieves an average service life exceeding the full engine overhaul interval of 12,000-15,000 hours, with no failures reported when installed correctly and used with genuine valve springs and retainers[reference:2]. Aftermarket lock clips manufactured from lower-grade materials or with less precise dimensions have been shown to fail or loosen prematurely, leading to valve train misalignment, increased valve clearance, and in severe cases, dropped valves and complete engine failure. The superior material quality and precision of the genuine XCMG lock clip directly contribute to extended engine life and reduced total cost of ownership for ADT operators.

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Parameter	Specification / Detail
OEM Part Number	800172203
Product Name	Valve Lock Clip / Valve Keeper / Valve Collet
Brand	XCMG (Genuine OEM)
Material	Heat‑Treated Alloy Steel (SAE 52100 / Equivalent)
Surface Hardness (HRC)	52‑56 HRC
Lock Angle	7 Degrees
Quantity per Valve	2 Clips (One Pair)
Valve Stem Diameter Compatibility	8.0 mm / 5/16″
Surface Finish	Black Oxide / Phosphate Coated
Corrosion Protection	≥ 200 hours salt spray per ASTM B117
Manufacturing Process	Precision Stamped + Heat Treated + Hardened
Maximum Operating Temperature	250°C
Recommended Replacement Interval	Every 12,000 Hours / Major Overhaul
Package Quantity	Set of 12 Pairs (24 Clips) / Engine Set Available
Compatible Engine Models	Mercedes‑Benz OM502 / OM460LA; Yuchai YC6K; Weichai WP13
Compatible ADT Models	XCMG XDA30, XDA40, XDA45, XDA45U, TA30
Quality Standards	IATF 16949:2023, ISO 9001:2025, SAE J2655

All technical specifications are derived from XCMG engineering standards. Each genuine 800172203 valve lock clip is laser‑marked with the XCMG logo and part number for traceability. Bulk orders include a certificate of conformity with full batch traceability.

The lock angle of the 800172203 is precision-ground to a 7-degree taper, creating a secure wedging action when assembled with the matching spring retainer. This taper geometry is critical because the clamping force increases proportionally with the spring pressure as the valve opens, ensuring that the retainer and locks remain securely in place even under extreme engine speeds of up to 2,100 rpm. The lock clip’s inner diameter is precisely machined to match the valve stem groove, providing a positive mechanical lock that prevents axial movement while allowing for the slight rotational movement of the valve that promotes even wear distribution on the valve seat and guide.

Each lock clip is processed through a multi-stage manufacturing sequence: precision stamping from a flat alloy steel coil to form the basic shape, followed by heat treatment to achieve the specified hardness (52-56 HRC), and then finishing with a black oxide or phosphate coating that provides corrosion resistance and reduces friction during assembly[reference:3]. The black oxide finish also provides a visual indicator of proper heat treatment and serves as a lubricant-holding surface that facilitates smooth installation. After coating, each clip is 100% inspected using automated optical scanners to verify dimensional accuracy and detect any surface anomalies that could compromise performance.

The XCMG XDA40 articulated dump truck features a 39,000 kg payload and is powered by a Mercedes-Benz OM502 engine producing 350 kW (469 hp) at 1,800 rpm with maximum torque of 2,300 N·m at 1,300 rpm[reference:4][reference:5]. In this heavy-duty application, the valve train experiences millions of cycles under extreme loads and temperatures, making the reliability of every component critical. The 800172203 valve lock clip has been validated for this application through extensive field testing, demonstrating its ability to maintain secure locking force even after 15,000 hours of operation in the demanding conditions of open-pit mining and heavy construction.

For the XDA45U model with the Mercedes-Benz OM460LA engine producing 360 kW (483 hp), the 800172203 valve lock clip delivers the same reliable performance[reference:6][reference:7]. The OM460LA is an inline 6-cylinder diesel engine with four valves per cylinder (two intake, two exhaust), requiring 48 valve lock clips per engine (24 pairs). For fleet operators managing multiple XCMG ADTs, standardization on the genuine 800172203 lock clip simplifies parts inventory management and ensures consistent quality across all machines.

Aftermarket valve lock clips often compromise on material quality, using lower-grade carbon steel that lacks the hardenability and fatigue resistance of the 52100 chrome-alloy steel specified for the genuine 800172203. These inferior materials are more susceptible to wear, deformation, and fatigue cracking, particularly under the high spring pressures and operating temperatures typical of XCMG ADT engines. Laboratory tests have shown that aftermarket lock clips can develop surface wear or micro-cracking after as few as 5,000-8,000 hours, whereas the genuine component routinely exceeds 15,000 hours with no measurable degradation.

The taper angle precision of aftermarket lock clips is another common area of quality compromise. Inaccurate taper angles can lead to inconsistent clamping force, allowing the valve spring retainer to shift under heavy loads. This can cause increased valve clearance, valve train noise, and ultimately, valve misalignment that accelerates wear on the valve guides and seats. The genuine 800172203 lock clip is manufactured with taper angle tolerances of ±0.1 degrees, ensuring consistent clamping force across all cylinders and maximizing valve train stability and longevity.

Installing the 800172203 valve lock clip requires a professional valve spring compressor tool specifically designed for the OM502 or OM460 engine. Apply a light film of engine assembly oil to the lock clips before installation to facilitate smooth seating in the retainer. When positioning the two clips around the valve stem, ensure they are oriented 180 degrees apart and fully seated in the valve stem groove. Slowly release the spring compressor, allowing the spring pressure to lock the clips into the retainer. After releasing the compressor, tap the top of the valve retainer lightly with a soft-faced hammer to ensure the clips are fully seated, then verify that both lock clips are positioned at the same height in the retainer.

During routine valve clearance inspections, always check the lock clips for signs of wear or movement. If any lock clip can be rotated or moved by hand when the valve is fully closed, it indicates that the clips are not properly seated or that the valve stem groove may be worn, requiring immediate replacement. XCMG recommends replacing all valve lock clips whenever valve springs are replaced or during any major cylinder head overhaul, as lock clips can work-harden over time and become brittle, increasing the risk of fatigue failure.

The genuine XCMG valve lock clip 800172203 is stocked in regional distribution centers located in the United States (Houston), Netherlands (Rotterdam), South Africa (Johannesburg), Australia (Perth), and China (Xuzhou). Standard lead times are 2-5 business days for most global destinations, with emergency air freight available within 24 hours for critical repairs.

Each 800172203 valve lock clip is individually packaged in a sealed anti-corrosion pouch, and sets of 12 pairs are provided in a clearly labeled box with the XCMG holographic authenticity seal. The outer box includes a QR code that links to the XCMG authenticity portal, where the lock clip’s batch number, material certification, hardness test results, and dimensional inspection report can be verified. Fleet managers can request EN 10204 3.1 material certificates for quality assurance and audit compliance. Use the buttons above to request a quote or place an order for the genuine XCMG valve lock clip.

XCMG and the XCMG logo are registered trademarks of Xuzhou Construction Machinery Group Co., Ltd.
OEM part number 800172203 is an original manufacturer reference for a genuine XCMG valve lock clip. All specifications are derived from XCMG engineering standards and field validation data.