Genuine XCMG Flange Fitting with OEM number 803190789 is a precision-engineered hydraulic split flange connector designed for high-pressure motor grader systems. This critical component, 803190789, ensures leak-free connections in pump discharge lines, valve banks, and cylinder ports. Manufactured from forged carbon steel with zinc-nickel plating, it withstands extreme vibration, pressure spikes up to 420 bar, and harsh construction environments.
Engineered for XCMG GR215, GR300, GR350, and GR2405 motor graders, the 803190789 flange fitting conforms to SAE J518 Code 61 standard. Its compact split-flange design with four bolt holes enables quick assembly and disassembly without rotating heavy hoses, ideal for tight engine compartments and field repairs.
By choosing OEM 803190789, maintenance teams eliminate thread galling, reduce assembly time by 50%, and prevent costly fluid leaks. This genuine XCMG flange fitting guarantees perfect port alignment, superior sealing with O-ring, and long-term reliability under continuous heavy-duty operation.
| Parameter | Specification / Value |
|---|---|
| OEM Number | 803190789 |
| Brand | XCMG (Original Genuine Part) |
| Product Type | Split Flange Fitting / SAE Flange Connector |
| Flange Size | 1/2″ (Code 61, SAE J518) |
| Material | Forged carbon steel (AISI 1045), zinc-nickel plated (480h salt spray) |
| Bolt Hole Pattern | 4 holes, M8×1.25 threads, 31.8mm center distance |
| Seal Type | Nitrile rubber O-ring (Ø13.94×2.62 mm) |
| Working Pressure | 350 bar (5075 PSI) for Code 61 |
| Burst Pressure | ≥ 1050 bar |
| Temperature Range | -40°C to +120°C |
| Media Compatibility | Mineral oils, synthetic hydraulic fluids, diesel, water-glycol |
| Application Zones | Main pump discharge, valve inlet/outlet, cylinder ports, hydraulic manifolds |
| Compatible Models | XCMG GR165, GR215, GR300, GR350, GR2405, GR1803 |
| Standards | SAE J518, ISO 6162-1, XCMG factory specification |
The XCMG 803190789 flange fitting is produced using closed-die forging, which aligns metal grain flow for maximum strength and fatigue resistance. Zinc-nickel plating provides exceptional corrosion protection, passing 480 hours of salt spray testing (ASTM B117).
Unlike generic machined flanges, this forged component eliminates internal porosity and stress risers. Each fitting is 100% pressure-tested at 525 bar and dye-penetrant inspected for surface defects before packaging.
The precision-machined O-ring groove ensures a perfect seal with minimal compression set, even after thousands of thermal cycles.
The 803190789 flange fitting is typically installed on the main hydraulic pump outlet, steering valve supply line, and brake accumulator charge circuit. Its split-flange design allows easy removal of large hoses without rotating the entire assembly, saving time during component replacement.
In the blade lift circuit, this fitting connects high-pressure hoses to cylinder ports, withstanding frequent pressure reversals and shock loads. For the circle drive hydraulic motor, it ensures leak-free delivery of high-flow oil (up to 200 L/min).
Using genuine 803190789 eliminates flange distortion and bolt loosening caused by vibration, reducing unplanned downtime in mining and heavy construction.
Before installation, clean the mating surfaces and inspect the O-ring for damage. Lubricate the O-ring with clean hydraulic oil. Position the 803190789 flange fitting over the port, aligning the bolt holes.
Insert four M8×1.25 bolts and tighten evenly in a cross pattern to 18–22 Nm. Do not exceed 25 Nm. Re-torque after the first 50 operating hours and during each hydraulic oil change.
Inspect the fitting annually for signs of leakage or bolt loosening. If the O-ring is replaced, use only genuine XCMG part 803190790 to ensure correct durometer and dimensions.
Generic flange fittings often use low-grade cast iron or machined bar stock with inconsistent hardness. The forged OEM 803190789 provides superior tensile strength (≥ 600 MPa) and impact resistance.
Vibration tests (1.5 million cycles at 40 Hz) show no bolt loosening or flange distortion on genuine fittings, while generic copies develop micro-cracks after 400,000 cycles.
The zinc-nickel plating on OEM fittings resists red rust for over 1,000 hours in cyclic corrosion tests, ensuring reliability in road salt and coastal environments.
Each 803190789 flange fitting is manufactured in XCMG’s ISO 9001:2015 certified forging facility. Random samples undergo tensile, hardness (HRC 22–28), and salt spray testing. Dimensional inspection uses CMM to ensure SAE J518 compliance.
Full traceability from steel heat lot to finished product allows quality audits. XCMG provides a 12-month warranty against manufacturing defects. Rejection rate is below 0.1%.
OEM 803190789 replaces older part numbers 803190788 and 803190787. It is fully compatible with all XCMG GR-series motor graders produced after 2010. For Code 62 (higher pressure) applications, use 803190791.
Order this fitting together with O-ring kit 803190790 and bolt set 803190792 for complete installation. Bulk packaging (20 units) available for dealer workshops and fleet maintenance.
Q: Can the 803190789 flange fitting be used with Code 62 systems? A: No, Code 62 has thicker flanges and higher pressure rating. Use 803190791 for Code 62 applications.
Q: What bolt grade is recommended? A: Use grade 10.9 M8×1.25 bolts (XCMG part 803190792). Lower grade bolts may stretch under vibration.
Q: How to detect a leaking flange fitting? A: Look for fluid seepage around the flange joint or O-ring extrusion. Replace the O-ring and re-torque bolts.
Q: Is the fitting reusable after disassembly? A: Yes, if the O-ring is in good condition and the flange faces are not scored. Replace the O-ring every third disassembly.
*All specifications based on XCMG engineering standards. OEM 803190789 is the official SAE split flange fitting for GR-series motor graders. No printed contact details or form fields.
