The 804019994 Balance Valve (also known as counterbalance valve, load control valve, motion control valve, hydraulic overcenter valve, pilot-operated check valve, and braking valve) is a genuine OEM hydraulic component manufactured by XCMG for motor graders and heavy construction equipment. This precision-engineered balance valve provides load-holding and smooth motion control for hydraulic cylinders in blade lift, circle rotation, articulation, ripper, and implement systems on XCMG GR series motor graders. Constructed from high-strength cast iron with hardened steel spools and premium seals, the 804019994 balance valve is engineered to withstand extreme operating pressures up to 24.5 MPa (245 bar / 3,553 psi) in the demanding working environments of XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2405, and GR3505 motor graders. The working hydraulic pressure across the XCMG GR series ranges from 16 MPa (2,320 psi) on standard models to 22 MPa (3,190 psi) on larger models such as the GR500.
| Parameter | Specification |
|---|---|
| OEM Number | 804019994 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Balance Valve / Counterbalance Valve / Load Control Valve |
| Valve Type | Pilot-operated, direct-acting relief with integral check valve |
| Maximum Operating Pressure | 24.5 MPa (245 bar / 3,553 psi) – 30 MPa (300 bar / 4,350 psi) |
| Proof Pressure | 32 MPa (320 bar / 4,640 psi) |
| Burst Pressure | ≥ 48 MPa (480 bar / 6,960 psi) |
| Rated Flow Capacity | Up to 150 L/min (depending on valve size) |
| Pilot Ratio | 3:1 to 5:1 (standard configuration) |
| Cracking Pressure (Standard) | 2 MPa – 4 MPa (factory preset) |
| Adjustable Pressure Range | 5 – 25 MPa (50 – 250 bar) |
| Housing Material | High-strength cast iron (GGG-50 / ductile iron) |
| Spool Material | Case-hardened steel, precision ground |
| Seal Material | Nitrile rubber (NBR) / Viton (optional high-temp) |
| Hydraulic Fluid | ISO VG 46 or VG 68 mineral oil-based hydraulic fluid |
| Fluid Temperature Range | -20°C to +80°C (-4°F to +176°F) |
| Port Threads | BSPP (G-thread) / SAE O-ring ports (varies by application) |
| Surface Finish | Black oxide / painted (XCMG proprietary coating) |
| Corrosion Resistance | 500+ hours salt spray (ASTM B117) without red rust |
| Weight | Approximately 2.5 – 4.5 kg (depending on size) |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2405, GR3505 motor graders |
| Certifications | ISO 9001:2015, ISO 14001, CE, RoHS |
The XCMG 804019994 Balance Valve is a critical component in the load-sensing hydraulic system of motor graders. Its primary function is to prevent hydraulic cylinders from dropping or drifting when the control valve is in the neutral position. This is achieved through a pilot-operated check mechanism that blocks reverse flow until a pilot pressure signal is applied. Without a properly functioning balance valve, implements such as the blade lift cylinder could drop uncontrollably under gravity, posing a serious safety hazard.
The balance valve also provides smooth deceleration when lowering heavy loads. The built-in relief valve regulates the back pressure on the cylinder, preventing the load from falling faster than the pump can supply oil. This feature is essential for blade lift circuits, where the weight of the moldboard and circle assembly can be several tons. The valve’s pilot ratio (typically 3:1 to 5:1) determines how much pilot pressure is required to open the check valve; a lower pilot ratio provides greater stability but requires more pilot pressure to release.
XCMG GR series motor graders utilize a load-sensing hydraulic system equipped with a variable piston pump and load-sensing multi-way valves. This advanced architecture improves operation comfort through pilot independent electrical proportional valves. The 804019994 balance valve is designed to work seamlessly within this system, providing precise load holding and smooth motion control for blade lift, circle rotation, articulation, ripper, and steering functions.
The 804019994 balance valve incorporates a pilot-operated relief section and an integral check valve. The check valve allows free flow from the directional valve to the load (cylinder), while the relief section controls flow from the load back to the directional valve. When the load pressure exceeds the relief setting, the valve opens to allow controlled descent. The pilot port can be used to reduce the effective relief setting proportionally to the pilot pressure applied, enabling smooth, variable speed control.
The valve features a precision-ground, heat-treated steel spool that assures long life and consistent performance even after thousands of operating cycles. The spool’s metering notches provide fine control over flow, allowing operators to make precise adjustments to blade position. The internal seals are made from high-grade nitrile rubber (NBR), offering excellent resistance to mineral-based hydraulic oils across a temperature range of -20°C to +80°C. For applications requiring higher temperature resistance, Viton seals are available as an option.
The valve body is cast from high-strength ductile iron (GGG-50), which provides exceptional pressure retention and resistance to fatigue cracking. All external surfaces are coated with a black oxide finish or XCMG’s proprietary paint system, providing over 500 hours of salt spray resistance per ASTM B117. This corrosion protection is essential for graders operating in coastal environments, winter road salt applications, or high-humidity conditions.
The 804019994 balance valve operates on a pilot-assisted relief principle. In the load-holding mode, the check valve prevents reverse flow from the cylinder to the tank, locking the load in position. When the operator commands a lowering motion, pilot pressure is applied to the valve’s pilot port. This pilot pressure reduces the effective cracking pressure of the relief valve proportionally to the pilot ratio. For example, with a 3:1 pilot ratio, a pilot pressure of 10 bar reduces the relief setting by 30 bar, allowing the valve to open at a lower load pressure.
The valve also includes an integral orifice in the pilot line to dampen oscillations and prevent cylinder chatter during lowering. This damping feature is critical for achieving smooth, jerk-free motion when lowering heavy blade assemblies. The orifice size is optimized for the flow characteristics of XCMG GR series graders, ensuring that the blade lowers at a controlled, predictable speed regardless of load weight.
The valve’s maximum operating pressure of 24.5 MPa (3,553 psi) exceeds the working hydraulic pressure of most GR series graders, which typically operate at 16 MPa (2,320 psi) to 18 MPa (2,610 psi). This safety margin ensures that the valve can withstand pressure spikes during sudden valve actuation or cylinder stall events without failing. For larger GR models such as the GR2405 and GR3505, the work system pressure can reach 24.5 MPa, and the 804019994 is fully rated for these higher pressures.
Each 804019994 balance valve is manufactured in XCMG’s ISO 9001:2015-certified hydraulic facility. The valve body is cast from high-grade ductile iron, then machined on CNC equipment to achieve exact port dimensions and sealing surface tolerances. The spool is produced from case-hardened steel, then ground and honed to a mirror finish (Ra ≤ 0.2 µm) to ensure smooth, stick-free operation and minimal internal leakage.
After assembly, each valve is tested on a computer-controlled test stand to verify cracking pressure, reseat pressure, pilot ratio, and flow capacity. The valve is cycled 50,000 times under load to confirm wear resistance and seal durability. The relief setting is calibrated to the specification required for the specific application; the setting can be adjusted using the integral adjustment screw, which is secured with a locknut and sealed with a tamper-proof cap.
XCMG subjects every batch of valves to a proof pressure test of 32 MPa (4,640 psi) and a burst pressure test exceeding 48 MPa (6,960 psi). Any valve that shows signs of leakage, cracking, or deformation is rejected. This rigorous testing ensures that the 804019994 will provide reliable service for thousands of operating hours in the most demanding grading applications.
Replacing a faulty balance valve requires careful attention to cleanliness and torque specifications. Before removal, relieve hydraulic pressure by cycling all control levers with the engine off. Clean the area around the valve thoroughly to prevent contamination from entering the hydraulic system. Disconnect the hydraulic lines, capping all open ports immediately. Remove the mounting bolts and carefully extract the valve from its mounting surface.
Inspect the mounting surface for damage or debris. Install the new 804019994 balance valve with a new sealing gasket or O-ring (supplied separately). Torque the mounting bolts to the specification in the service manual (typically 50-70 Nm). Reconnect the hydraulic lines, ensuring that the fittings are tightened to the correct torque (35-45 Nm for M14 ports).
After installation, start the engine and cycle the hydraulic functions through their full range of motion. Check for leaks at all connections. Verify that the load holds position when the control lever is returned to neutral. Test the lowering function to ensure smooth, controlled descent without chatter or oscillation. If the valve is adjustable, set the relief pressure according to the specifications in the service manual using a pressure gauge connected to the cylinder port.
Aftermarket balance valves often use lower-grade castings that can crack under pressure, or spools with poor metering characteristics that cause jerky, unpredictable blade motion. The genuine XCMG 804019994 is manufactured to the same specifications as the original factory valve, guaranteeing identical flow characteristics, pilot ratio, and mounting dimensions. Aftermarket valves may also have incorrect pilot ratios, leading to unstable load holding or excessive pilot pressure requirements.
Counterfeit valves often omit critical internal components such as damping orifices or use inferior seal materials that leak or swell. The 804019994 includes all factory-specified internal elements, ensuring that your grader maintains its original performance and safety characteristics. Additionally, genuine XCMG valves are batch-tested for pressure integrity, whereas counterfeit products rarely undergo any quality control.
XCMG provides a 12-month warranty against manufacturing defects. Each valve is serialized for traceability. This supersedes older numbers with improved spool coatings and more durable seals for extended service life. Using genuine XCMG balance valves ensures compatibility, reliability, and the protection of your valuable equipment.
Common symptoms of a failing balance valve include: blade drift (uncommanded movement) when the control lever is in neutral, jerky or erratic descent when lowering the blade, inability to hold the blade at a set height, external oil leakage from the valve body, and excessive heat generation in the hydraulic system. Also, if the blade lowers faster than the pump can supply oil (runaway descent), the valve’s relief section may be worn or damaged.
Preventive replacement is recommended every 6,000 to 8,000 operating hours, or whenever the valve shows signs of internal wear. The cost of a genuine balance valve is minimal compared to the cost of a dropped blade, damaged cylinder, or personal injury caused by a failed load-holding circuit. When replacing a valve, always use new sealing washers and O-rings to ensure leak-free installation.
During routine maintenance, inspect the valve for external leakage and listen for unusual noises (chattering or whistling) during operation. Check the adjustment locknut for tightness; a loose locknut can allow the relief setting to drift over time. Keep a stock of 804019994 valves in your parts inventory for rapid field replacement.
The 804019994 Balance Valve is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). Standard air freight delivers within 3-7 business days worldwide. Expedited shipping (1-2 days) is available for urgent breakdowns.
Bulk orders (5+ units) receive volume discounts and can be shipped via sea freight. Each valve is individually packed in a foam-lined carton to prevent damage during transit. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime.
Don’t let a worn or leaking balance valve compromise grader safety or performance. Order the genuine XCMG 804019994 Balance Valve today and restore reliable load holding and smooth motion control to your motor grader.
The 804019994 Balance Valve is a critical safety component in your motor grader’s hydraulic system. A failed balance valve can allow the blade to drop uncontrollably, causing injury to personnel and damage to the machine. Keep spare valves in your service truck for rapid field replacement, and always replace with genuine XCMG components.
Upgrade your motor grader’s hydraulic reliability with the XCMG genuine balance valve. Engineered for strength, precision, and safety – order now and experience the quality that keeps your grader productive and secure.
