Genuine XCMG Plug with OEM number 803189850 is a precision-engineered hydraulic port sealing component designed for motor grader systems. This essential part, 803189850, effectively seals unused ports on valve blocks, pumps, and manifolds, preventing fluid leakage and contamination ingress. Manufactured from cold-headed carbon steel with zinc-nickel plating, it withstands extreme vibration, corrosion, and pressures up to 420 bar (6090 PSI).
Engineered for XCMG GR215, GR300, GR350, and GR2405 motor graders, the 803189850 plug features a hex head for easy installation and removal. Its M14×1.5 metric fine thread ensures perfect compatibility with XCMG hydraulic ports. The integrated bonded washer provides a reliable metal-to-rubber seal without the need for thread tape or sealant.
By choosing OEM 803189850, maintenance teams eliminate cross-threading risks, prevent costly fluid leaks, and protect hydraulic systems from dust and moisture. This genuine XCMG plug guarantees perfect thread engagement, superior sealing, and long-term reliability under the most demanding construction conditions.
| Parameter | Specification / Value |
|---|---|
| OEM Number | 803189850 |
| Brand | XCMG (Original Genuine Part) |
| Product Type | Hex Head Hydraulic Port Plug / Sealing Plug |
| Thread Size | M14 × 1.5 (metric fine thread) |
| Hex Size | 17 mm |
| Overall Length | 18 mm |
| Material | Cold-headed carbon steel (C45E) + zinc-nickel plating (480h salt spray) |
| Seal Type | Pre-assembled bonded washer (NBR + steel) |
| Max. Operating Pressure | 420 bar (6090 PSI) |
| Burst Pressure | ≥ 1260 bar |
| Temperature Range | -40°C to +125°C |
| Media Compatibility | Mineral oils, synthetic hydraulic fluids, diesel, water-glycol |
| Application Zones | Unused ports on valve blocks, pump cases, manifolds, cylinder ends |
| Compatible Models | XCMG GR135, GR165, GR215, GR300, GR350, GR2405, GR1803 |
| Standards | ISO 8434-1, DIN 2353, XCMG factory specification |
The XCMG 803189850 plug is produced using multi-stage cold heading, which preserves material grain flow and enhances fatigue resistance. Zinc-nickel plating offers three times the corrosion protection of standard zinc, passing 480 hours of salt spray testing (ASTM B117).
Unlike generic plugs, this OEM component features a radiused thread root and a precision-machined seating surface that eliminates stress risers. Each plug is 100% pressure-tested at 630 bar to verify structural integrity before packaging.
The bonded washer is made of NBR rubber bonded to a steel backing ring, ensuring consistent compression and sealing even after repeated installation cycles.
The 803189850 plug is typically used to seal auxiliary ports on the main hydraulic pump, steering valve, and brake manifold. It also closes unused test points and drain ports, preventing contamination from entering the hydraulic system.
Proper plug selection prevents thread galling and fluid leakage. Using genuine 803189850 ensures correct engagement depth and leak-free sealing under high-frequency pressure pulsations.
In mining and heavy construction, this plug reduces unplanned downtime by eliminating fluid leaks that lead to environmental hazards and component starvation.
Before installation, clean the female port threads and inspect for burrs or old seal remnants. Hand-tighten the 803189850 plug until the bonded washer contacts the face, then torque to 30–35 Nm. Do not exceed 40 Nm to avoid distorting the washer.
During scheduled maintenance (every 500 hours), inspect plugs for signs of leakage, rust, or thread damage. Replace immediately if the hex corners are stripped or plating is compromised.
When removing a plug, always replace the bonded washer with a new one (XCMG part 803189851) to ensure proper sealing upon reinstallation.
Generic plugs often use low-grade steel with inconsistent heat treatment, leading to thread seizure and early cracking. The OEM 803189850 maintains precise thread geometry and consistent hardness (HRC 28–32).
Vibration tests (1.5 million cycles at 50 Hz) show zero loosening on genuine plugs, while generic copies fail after 300,000 cycles. The bonded washer on OEM plugs provides superior sealing even under extreme pressure spikes.
Investing in genuine XCMG 803189850 eliminates leak paths, reduces oil consumption, and prevents contamination ingress through loose connections.
Each 803189850 plug is manufactured in XCMG’s ISO 9001:2015 certified facility. Random samples undergo tensile, hardness, and torque retention tests. Plating thickness is measured via X-ray fluorescence to ensure consistent protection.
Full traceability from raw material lot to finished product allows quality audits and recalls if needed. XCMG provides a 12-month warranty against manufacturing defects. Rejection rate for non-conforming parts is below 0.2%.
OEM 803189850 replaces older part numbers 803189848 and 803189849. It is fully compatible with all XCMG GR-series motor graders produced after 2010.
For complete hydraulic sealing, order this plug together with bonded washer kit 803189851 and protective caps 803189852. Bulk packaging (100 units) available for dealer workshops and fleet maintenance.
Q: Can 803189850 be used with PTFE tape? A: No, the bonded washer provides the seal. Tape may cause thread damage and over-torque.
Q: What is the recommended replacement interval? A: Replace every 2000 operating hours or when plating shows red rust. In corrosive environments (road salt), inspect annually.
Q: How to identify a genuine XCMG plug? A: Genuine parts have laser-etched OEM number 803189850 on the hex face and uniform zinc-nickel finish.
Q: Is this plug compatible with bio-hydraulic oils? A: Yes, the NBR bonded washer and steel body are compatible with HEPG, HEES, and mineral oils. Avoid phosphate esters.
*All specifications based on XCMG engineering standards. OEM 803189850 is the official port plug for GR-series motor graders. No printed contact details or form fields.
