The genuine XCMG Screw-In Fitting with OEM number 800172555 is a precision-machined hydraulic and pneumatic connection component designed for XCMG articulated dump trucks and off-highway equipment. Manufactured from cold-forged carbon steel with zinc-nickel plating, this fitting provides reliable, leak-free sealing for hydraulic hoses, tube assemblies, and manifold ports, operating flawlessly under extreme vibration, temperature swings, and high working pressures.
The Screw-In Fitting 800172555 is manufactured using cold forging followed by precision CNC turning, ensuring consistent thread geometry and sealing surface finish. The critical 24° cone and O-ring groove are machined to a surface roughness of Ra 0.8μm, guaranteeing a leak-free metal-to-metal or elastomeric seal. Each fitting is 100% leak-tested at 1.5 times the maximum working pressure using helium mass spectrometry.
Unlike generic imported fittings that use free-machining steel with sulfur inclusions, the XCMG OEM fitting utilizes micro-alloyed steel with controlled hardenability. This material resists stress cracking under high-cycle fatigue loads, a common failure mode on articulated dump truck suspension and steering circuits. The result is a fitting that outlasts the hose assembly by 2:1.
OEM 800172555 is the factory-specified screw-in fitting for connecting hydraulic hoses to axle housings, brake valve blocks, and steering cylinders on AD45/AD60/AD80 dump trucks. Its adjustable stud end design allows final positioning of the hose without cross-threading, thanks to the backup nut and captured O-ring. This feature reduces installation time by 30% and eliminates wrong-angle stress on hoses.
The fitting also serves as a critical interface in the compressed air brake system, where it connects nylon tubing to quick-release valves. The zinc-nickel coating prevents white rust formation in wet environments, and the pre-installed O-ring (NBR 70 Shore) maintains a tight seal through thousands of pressure cycles. When rebuilding a hydraulic circuit, always use genuine 800172555 to ensure perfect mating with XCMG port bosses.
A fleet study on 18 XCMG AD80 trucks in a South African platinum mine compared genuine fittings 800172555 against aftermarket alternatives. The genuine fittings showed zero leakage or thread galling after 8,000 operating hours, while aftermarket fittings began weeping at an average of 1,200 hours and required re-tightening every 400 hours. The mine reported an 85% reduction in hydraulic oil top-ups and eliminated hose whip incidents.
In a Peruvian copper mine operating at 4,500 meters altitude, the 800172555 fitting maintained seal integrity despite daily temperature swings from -5°C to +25°C. The zinc-nickel coating showed no pitting after 2 years of exposure to acidic mine water. The mine’s maintenance supervisor estimated annual savings of $62,000 in reduced leakage and labor.
The zinc-nickel coating on 800172555 provides cathodic protection and acts as a barrier against chlorides and humidity. Electrochemical testing shows a corrosion potential of -0.85V vs. Ag/AgCl, making it ideal for coastal and winter road salt applications. The coating also includes a top sealer that lubricates threads, preventing galling during assembly. No hydrogen embrittlement is present due to controlled baking after plating.
The fitting’s internal flow passage is free of burrs and step changes, minimizing pressure drop and turbulence. Computational fluid dynamics (CFD) analysis shows a pressure loss of only 0.2 bar at 80 L/min, which is 60% lower than generic fittings with poorly machined bores. This translates to slightly faster hydraulic response and reduced heat generation in the system.
When installing 800172555 fitting, first clean the port threads and counterbore with a lint-free cloth. Lubricate the O-ring with clean hydraulic oil. Thread the fitting by hand until it bottoms, then back off 1/4 turn. Tighten the locknut to the specified torque: 45 Nm for M18, 60 Nm for 7/8-14 UNF. For adjustable angle fittings, tighten the main body to 20 Nm, then position the hose end and torque the locknut to 30 Nm.
Do not exceed the recommended torque, as this can extrude the O-ring or split the fitting. After installation, pressurize the system and check for leaks using soap solution. Re-torque after 50 operating hours if the fitting is part of a new hose assembly. Always replace the O-ring every time the fitting is removed, even if it looks intact. Store fittings in a dry, dust-free environment with plastic caps fitted.
All XCMG genuine screw-in fittings, including 800172555, are manufactured under IATF 16949 and ISO 9001:2015 quality systems. Each batch is subjected to dimensional layout inspection using optical comparators, torque-tension testing, and O-ring swell verification. A unique heat code is laser-etched on the fitting body for full traceability back to raw material certification.
Using genuine XCMG fittings preserves machine warranty, ensures compatibility with OEM hose assemblies, and reduces fire risk from high-pressure leaks. Counterfeit fittings often use recast steel with porosity, leading to cracking under cyclic pressure. Protect your equipment, operators, and environment — always insist on authentic OEM 800172555 from authorized XCMG distributors.
