803077027 XCMG GR2605 motor grader brake valve

803077027 XCMG GR2605 motor grader brake valve

Part Number: 803077027
Compatible Model: XCMG GR2605 Grader
Product Positioning: Responsible for adjusting the hydraulic pressure of the brake circuit to achieve precise control of service brake, parking brake and emergency brake, and is a key component to ensure the safety of the entire machine operation.

Key Technical Parameters

1. Pressure and Control Performance
Rated Working Pressure: 16MPa
Maximum working pressure: 20MPa
Brake Response Time: ≤0.2s (from pedal actuation to brake pressure build-up)
Pressure Regulation Accuracy: ±0.3MPa (within rated pressure range)
Control Method: Foot-operated hydraulic control + manual parking control (dual-circuit independent control)

2. Structure and Dimensions
Structure Type: Dual-circuit pilot-operated brake valve (integrated parking brake function)
Number of Circuits: 2 independent working circuits (front axle/rear axle controlled separately)
Installation Method: Flange mounting, compatible with original factory brake system mounting bracket
Interface Specifications: Inlet G1″, Outlet G3/4″ (dual-circuit independent interface)
Pedal Stroke: 150±10mm (matching original factory brake pedal linkage mechanism)

3. Material and Weather Resistance
Valve Body Material: High-strength aluminum alloy ZL107 (die-cast + Anodized finish), tensile strength ≥280MPa
Valve core material: High-quality alloy structural steel (quenched + precision ground), hardness HRC55-60
Seals: Imported fluororubber (FKM) sealing components, suitable for working environments from -40℃ to 120℃
Contamination resistance rating: ISO 18/15 (suitable for the cleanliness requirements of hydraulic oil in engineering machinery)
Fatigue life: ≥1 million cycles of braking without failure (under rated operating conditions)

Core functions and application scenarios

1. Main Functions
* **Service Brake Control:** Adjusts brake pressure via foot pedal operation, enabling synchronous or independent braking of the front and rear axles.
* **Parking Brake Lock:** Manually controls the parking brake circuit for stable parking after stopping, preventing rollover.
* **Dual Circuit Protection:** Dual-circuit independent design; if one circuit fails, the other still ensures basic braking function.
* **Pressure Compensation Adjustment:** Automatically compensates for brake line pressure loss, ensuring uniform braking force under different operating conditions.
* **Emergency Braking Function:** Integrates an emergency brake valve to handle emergency braking needs in case of sudden hydraulic system failure.

2.Suitable Operating Conditions
* **Heavy-load braking scenarios such as highway construction, mine stripping, and airport runway construction.**
* **Complex operating conditions such as long downhill slopes, high-frequency braking, and long-term continuous operation.**
* **Harsh operating environments with high and low temperatures, dust, and mud/water erosion.**
* **Braking safety requirements under special road conditions such as muddy and bumpy surfaces.**

Product Advantages

* **Original Factory Compatibility:** Fully matches the GR2605 braking system interface and control logic, requiring no modification for direct installation, compatible with original factory brake lines and pedal mechanism.
* **Precise Braking:** Pilot-operated structure. + Dual-circuit control ensures rapid braking response, precise pressure regulation, and smooth operation.
* Safety redundancy: Independent dual-circuit operation plus emergency braking function provides double protection for braking safety, reducing operational risks.
* Durability: High-strength materials and precision machining ensure fatigue resistance, wear resistance, and contamination resistance, resulting in a long service life.
* Environmental adaptability: Wide-temperature sealing design and dust-resistant structure enable continuous and stable operation under harsh conditions.
* Easy maintenance: Modular structure design allows for simple disassembly and assembly of vulnerable parts, facilitating efficient maintenance and replacement and reducing downtime.

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