The genuine OEM 804009799 Brake Valve is a precision hydraulic control component designed exclusively for XCMG motor graders. This critical valve modulates brake pressure to the rear axle and parking brake circuits, ensuring safe, progressive stopping power in all operating conditions for GR series graders.
Manufactured to original equipment specifications, the 804009799 brake valve features a cast iron body with integral pressure reducing and relief functions. It accepts input pressure up to 18 MPa from the accumulator and delivers regulated output pressure to the brake actuators. The valve operates reliably from -40°C to +120°C and is compatible with mineral-based brake fluids.
Using genuine XCMG 804009799 brake valves eliminates brake drag, inconsistent pedal feel, and premature wear of brake components. Each unit undergoes 100% pressure calibration and leakage testing before packaging. Upgrade your grader’s braking safety with authentic OEM quality.
The 804009799 brake valve uses a precision-machined spool and spring arrangement to provide smooth, progressive pressure build-up corresponding to pedal travel. This ensures consistent deceleration regardless of load or ground conditions, reducing operator fatigue and tire wear.
The built-in relief valve protects the brake circuit from pressure spikes, preventing seal damage and hose bursts. An integral anti-cavitation feature prevents vacuum formation during rapid pedal release, ensuring immediate brake response on subsequent application.
Each 804009799 valve is factory-set to deliver output pressure proportional to pilot pressure, with minimal hysteresis. The cast iron housing is pressure-tested to 36 MPa, and all dynamic seals are made of low-friction PTFE-filled NBR for long service life.
This brake valve directly replaces OEM part 804009799 on XCMG GR2153, GR200, GR180, GR3005, and GR3505 graders. It is installed between the brake accumulator and the rear axle brake calipers, and also supplies the parking brake release circuit.
For older GR135 and GR165 series, the 804009799 valve offers drop-in compatibility with existing hydraulic line connections. Cross-reference with aftermarket numbers: BV-2410, XCMG-BV210. Standardizing on genuine brake valves ensures consistent pedal feel and maximum stopping power.
The valve includes a test port for diagnostic pressure measurement. It is designed for use with closed-center hydraulic systems common on XCMG graders. Ensure the accumulator pre-charge is within specification before valve installation.
Before installing the 804009799 brake valve, depressurize the brake accumulator and clean all port threads. Apply thread sealant (Loctite 567) to tapered threads only. Mount the valve using new bolts torqued to 25-30 Nm. Connect the inlet, outlet, and pilot lines as per the grader’s hydraulic diagram.
After installation, bleed the brake circuit by opening the bleed screws on each caliper while applying light pedal pressure. Top up the brake fluid reservoir. Test brake function at low speed before returning the grader to service. If pedal feel is spongy, repeat bleeding.
All 804009799 brake valves are manufactured in XCMG’s ISO 9001:2015 and IATF 16949 certified facilities. Each unit undergoes 100% functional testing on a dedicated brake test bench, measuring input-output pressure curve, hysteresis, and leakage (internal and external).
Random samples are subjected to 500,000 brake application cycles at maximum pressure, followed by salt spray testing (ASTM B117, 720 hours). The valve body is X-ray inspected for porosity. Traceability labels include calibration data and date code.
Aftermarket brake valves often have incorrect pressure regulation, leading to brake grab or weak stopping power. Genuine 804009799 valves use OEM-spec springs and spool geometries, validated by thousands of field hours on XCMG graders.
Fleet operators report that genuine XCMG brake valves maintain consistent pedal feel for over 10,000 hours, while aftermarket units cause brake drag or premature wear within 2,000 hours. Protect your grader’s braking system and operator safety. Choose authenticity, choose 804009799.
The 804009799 brake valve is stocked in XCMG regional warehouses across North America, Europe, Asia-Pacific, the Middle East, and Africa. Standard lead time is 5-7 working days. Express freight available for urgent breakdowns. Bulk orders (10+ pieces) receive volume discounts.
Each valve is packed in heavy-duty foam-lined cartons with anti-rust coating. Technical datasheets, installation drawings, and calibration reports are provided digitally. XCMG parts specialists offer remote diagnostic support for brake system troubleshooting.
A large mining contractor in Australia replaced aftermarket brake valves on 18 XCMG GR215 graders with genuine 804009799 units. After 6,000 operating hours, zero brake performance complaints were recorded, and brake disc life increased by 40% due to reduced drag.
In Canadian winter operations at -40°C, the 804009799 valve maintained consistent response and no internal leakage, while aftermarket valves often stuck or leaked. Operators reported confident stopping power even on icy surfaces.
The 804009799 is available with standard output pressure range 0-10 MPa. Custom pressure settings (e.g., 0-8 MPa for lighter graders) can be ordered with a 10-day lead time. Minimum order for custom calibration is 5 pieces.
For fleet managers, XCMG offers brake valve overhaul kits that include the 804009799 valve, mounting bolts, and port seals. Kits come with installation torque cards and bleeding instructions. Contact our parts team for consignment stock arrangements.
To maximize service life of your 804009799 brake valve, change brake fluid every 2,000 hours or annually (whichever comes first). Inspect for external leakage around the spool cover and pilot port. If brake pedal feel becomes spongy or requires excessive travel, bleed the system and check the valve.
If the valve fails to release pressure, the spool may be stuck due to contamination. Flush the brake circuit with clean fluid before replacing the valve. Genuine XCMG brake valves typically provide 10,000-15,000 hours of reliable service.
In summary, OEM number 804009799 represents the industry standard for XCMG motor grader braking control. From spool precision to pressure regulation, every detail meets the highest safety requirements. Never risk brake failure or erratic stopping. Order the genuine 804009799 brake valve for your fleet today and experience the XCMG quality difference.
With proven reliability in thousands of graders worldwide, the 804009799 valve continues to outperform aftermarket alternatives. Ensure confident stopping power, operator safety, and extended brake component life. Choose genuine XCMG for your grader’s braking system. Secure your fleet’s safety with OEM authenticity.
