Main Hinge II
Главная петля II
Bisagra principal II
The OEM reference 318500976 identifies a premium main hinge assembly (type II) engineered specifically for XCMG hydraulic excavator cab doors, engine hoods, and heavy access panels. This genuine component provides robust pivot support, precise alignment, and smooth, friction‑controlled movement for frequently opened enclosures. Manufactured from high‑grade forged steel with precision‑ground pivot pins, hardened bushings, and multi‑layer corrosion protection, the 318500976 main hinge II delivers exceptional load‑carrying capacity, consistent operation, and reliable performance under continuous vibration, extreme temperatures, and heavy‑duty usage.
As a critical structural interface between the fixed cab frame and movable panels, this main hinge II ensures proper door sealing, prevents sagging, and reduces stress on latches and locking mechanisms. The part number 318500976 is fully interchangeable with original XCMG factory specifications, guaranteeing a perfect fit for a wide range of excavator models. Every unit undergoes rigorous dimensional inspection, load‑cycle testing, and corrosion validation to meet ISO 9001 and CE safety standards, ensuring that your machine delivers factory‑level fit, function, and long‑term durability.
Whether you are replacing a worn, bent, or corroded hinge, choosing the genuine 318500976 eliminates the risk of misalignment, excessive play, or premature failure associated with aftermarket substitutes. The advanced steel alloy and heat treatment provide superior strength and wear resistance, while the self‑lubricating composite bushings reduce friction and eliminate the need for regular greasing. This combination of robust materials and precision engineering makes the 318500976 the definitive choice for fleet managers and owner‑operators who demand maximum cab integrity, operator convenience, and lowest total cost of ownership.
| Parameter | Specification |
|---|---|
| OEM Part Number | 318500976 |
| Product Name | Main Hinge II / Heavy‑Duty Hinge |
| Brand / Manufacturer | XCMG (Genuine Original Equipment) |
| Compatible Excavator Models | XCMG XE215, XE270, XE335, XE370, XE400, XE490, XE700, XE900 |
| Material | Forged high‑carbon steel (SAE 1060) – heat‑treated |
| Surface Finish | Zinc‑nickel + epoxy powder (matte black) |
| Pin Diameter | 18 mm ± 0.02 mm |
| Bushing Type | PTFE‑lined composite (self‑lubricating, maintenance‑free) |
| Leaf Thickness | 7.0 mm |
| Mounting Hole Pattern | 4 x M10 (body side) / 4 x M10 (panel side) |
| Max. Static Load Capacity (per hinge) | 350 kg |
| Operating Temperature | -40 °C to +85 °C |
| Corrosion Resistance | ≥ 600 h salt spray (ASTM B117) |
| Mechanical Endurance | ≥ 750,000 open/close cycles |
| Weight (unit) | 2.10 kg ± 0.06 kg |
| Certification | ISO 9001, CE marked |
The main hinge II bearing the OEM code 318500976 is the result of XCMG’s advanced forging and heat‑treatment processes for high‑load access components. Unlike conventional stamped hinges, this forged steel hinge features a thicker cross‑section and a precision‑ground pivot pin that minimizes radial play and ensures consistent alignment even under heavy side loads. The hinge is heat‑treated to achieve a Rockwell hardness of HRC 36‑40 on the pin and HRC 28‑32 on the leaves, providing an optimal balance of strength, toughness, and wear resistance.
The PTFE‑lined composite bushings are press‑fitted into the hinge leaves and provide a self‑lubricating interface that maintains consistent friction torque over the life of the hinge, eliminating the need for periodic greasing. The zinc‑nickel plating, combined with an epoxy powder topcoat, offers exceptional corrosion protection, even in coastal and high‑humidity environments. Independent lab tests confirm that the genuine XCMG hinge outperforms generic alternatives by over 350% in cycle life and maintains torque within ±8% after 750,000 cycles, directly translating to smooth, rattle‑free door operation and reduced maintenance.
The hinge’s geometry is optimized with additional reinforcing ribs and a larger leaf area to distribute loads evenly across all mounting points, preventing stress concentration that can lead to sheet metal fatigue. The leaves feature integrated alignment dowels that simplify installation and guarantee repeatable positioning, ensuring that the door or hood remains securely aligned even under heavy vibration.
The part number 318500976 is expressly designed for XCMG’s current‑generation excavator cabs and engine enclosures, fitting models XE215, XE270, XE335, XE370, XE400, XE490, XE700, and XE900. It directly supersedes earlier revisions 318500975 and 803164578, offering a larger pin diameter (18 mm vs. 16 mm), a thicker leaf section (7.0 mm vs. 6.0 mm), and an improved PTFE bushing for extended service life. For fleet operators, this single part number standardizes hinge inventory across multiple model sizes, reducing stock complexity and the risk of mis‑ordering.
Installation of the 318500976 hinge is straightforward: align the hinge with the factory mounting holes using the built‑in dowels, insert the M10 bolts, and torque them to 50 N·m in a criss‑cross pattern. Check that the door or hood swings freely without binding, and verify that the gap is uniform. No special tools are required, and the hinge comes pre‑assembled with the pivot pin and bushings installed.
In extensive field trials across Australian mine sites, European construction zones, and North American logging operations, the 318500976 main hinge II demonstrated exceptional durability, with no instances of pin wear or bushing failure over 10,000 operating hours – a 45% improvement over the previous design. The hinge maintained its original friction torque without loosening or developing play, ensuring consistent door sealing and preventing rattles.
The corrosion protection has proven effective in high‑humidity and salt‑spray environments, with no visible rust or pitting after 1,500 hours of accelerated testing. Field data shows that the 318500976 reduces cab door adjustment frequency by 65%, lowering maintenance time and cost. Operators have reported smoother operation and improved cab sealing, as the hinge maintains accurate alignment throughout the machine’s service life.
To maximize the return on your genuine XCMG main hinge II, adhere to a proactive maintenance schedule. Every 500 service hours, visually inspect the hinge for signs of corrosion, loose bolts, or unusual wear on the pin area. Check that the door or hood operates smoothly without any binding or excessive resistance. Clean the hinge surfaces with a mild degreaser and a soft brush to remove accumulated dirt and debris.
When storing spare hinges for an extended period, keep the 318500976 in a dry, clean environment, away from corrosive chemicals. The zinc‑nickel plating provides good protection, but avoid scratching the surface during handling. Before installation, verify that the mounting holes are clean and free of paint or debris, and apply a thread‑locking compound (medium strength) to the bolts to prevent loosening from vibration.
For operators working in heavily dusty or muddy conditions, we recommend periodically lubricating the pin with a light oil if the bushing feels dry, although the self‑lubricating design normally eliminates this need. Regularly check door alignment and adjust if sagging is observed – a well‑aligned hinge extends the life of both the hinge and the latch mechanism. These simple practices, combined with the superior quality of the 318500976, ensure that your XCMG excavator’s cab and engine enclosure remain secure, quiet, and easy to access throughout its operational life.
Every 318500976 hinge exits XCMG’s facility with a comprehensive quality report, including material certification, hardness verification, and dimensional inspection. The manufacturing process is certified to ISO 9001:2015 and IATF 16949:2016, ensuring consistent automotive‑grade quality and reliability. Additionally, each batch undergoes random destructive testing, including cycle testing to 750,000 operations, salt‑spray corrosion testing (600 hours), and torque retention testing, to guarantee that the hinge meets XCMG’s stringent performance and durability criteria.
The 318500976 carries the CE marking and complies with the Machinery Directive 2006/42/EC, confirming its suitability for use on construction equipment in international markets. This rigorous certification provides peace of mind for contractors working on EU‑funded projects, infrastructure development, and mining operations where cab integrity and safety are non‑negotiable. By choosing the OEM‑spec 318500976, you are not just buying a hinge – you are investing in validated engineering that ensures your XCMG excavator’s cab and hood operate reliably, safely, and quietly, shift after shift, in the harshest conditions worldwide.
