YA00031363 UB36-303 Main Control Valve for Hitachi ZX870-5G

The YA00031363 UB36-303 Main Control Valve (Distributor Valve Assembly) is a precision-engineered hydraulic control valve designed as a direct replacement for the Hitachi ZX870-5G crawler excavator. This multi-spool directional control valve manages hydraulic oil distribution to the boom, arm, bucket, swing, and travel circuits, ensuring smooth, responsive, and proportional implement control under the most demanding mining and heavy excavation conditions.

Compatible Model

• Hitachi ZX870-5G – Large Crawler Excavator (Mining & Heavy Construction)

Key Features

• OEM Direct Replacement: Manufactured to match Hitachi original YA00031363 specifications with identical spool configurations, port locations, and mounting dimensions
• Multi-Spool Configuration: Integrated multiple spool sections for boom, arm, bucket, swing, and auxiliary circuits with load-sensing pressure compensation
• High Flow Capacity: Designed for the high hydraulic flow rates required by ZX870-5G class excavators with minimal pressure drop across the valve body
• Precision-Machined Spools: Hard chrome-plated spools with micro-finished surfaces ensure low friction, reduced internal leakage, and long service life
• Integrated Relief Valves: Built-in main relief and port relief valves protect the hydraulic system from pressure spikes and overload conditions
• 100% Tested: Each valve assembly is tested on a hydraulic test bench for spool stroke, pressure settings, internal leakage, and flow characteristics

Technical Specifications

Company Profile

ABOUT US

Guangzhou Xingfan Precision Oil Pressure Co., Ltd. focuses on the after-market hydraulic maintenance and replacement of construction machinery including excavator, rotary drilling rig, pile driver, concrete mixer, delivery pump truck, crane, harvester and other equipment. Including hydraulic pump, traveling motor, rotary motor, distribution valve multi-way valve, gear pump, operating handle, walking foot valve, etc.

Factory Display

Quality Assurance

All control valves are manufactured in an ISO 9001:2015 certified facility. Each valve assembly undergoes comprehensive testing on a hydraulic test bench including spool stroke verification, pressure setting calibration, internal leakage measurement, and flow characteristic testing. 12-month warranty against manufacturing defects.

Frequently Asked Questions

Q1: What Hitachi model does this control valve fit?
A: The YA00031363 UB36-303 main control valve is specifically designed for the Hitachi ZX870-5G large crawler excavator. It is a direct bolt-on replacement matching all OEM mounting dimensions, hydraulic port locations, and spool configurations.

Q2: Is this a complete valve assembly or individual components?
A: This is a complete main control valve (distributor) assembly including the valve body, all spools, relief valves, check valves, and seals – pre-assembled, adjusted, and tested as a unit.

Q3: What warranty do you provide?
A: We offer a 12-month warranty from the date of shipment covering manufacturing defects and workmanship. Installation guidance and technical support are available from our engineering team.

Q4: Can I order a sample for testing?
A: Yes, sample orders are welcome. We recommend confirming the part number YA00031363 and model UB36-303 match your Hitachi ZX870-5G before ordering. Our team can assist with compatibility verification.

Q5: What is the lead time for this control valve?
A: Stock items ship within 3-5 working days. For production orders, the lead time is typically 20-30 working days due to the complexity of multi-spool valve assembly and testing.

Q6: Do you provide installation support?
A: Yes, our engineering team can provide hydraulic circuit diagrams, torque specifications, and commissioning procedures. Remote video support is also available to assist with proper installation and adjustment.

Contact us today for pricing, technical specifications, or to place an order.