Detailed Product Introduction of Compound Dual Axial Piston Pump Assembly for Sany SY980H Excavator

I. Core Coding & Compatibility Information

II. Overall Structure & Complete Matching Accessories

• Dual main pump cylinder block & piston assembly (parallel left & right dual pump layout)
• Electronic E-P pressure & flow regulating solenoid valve (calibrated for Sany ICT integrated electronic control system)
• Swashplate variable mechanism, servo pistons, feedback sensors
• High-strength transmission shaft & heavy-duty roller bearing assembly
• Wear-resistant valve plate, alloy piston & slipper assembly
• Complete FKM rubber sealing kit, flange sealing gaskets, positioning bolts, oil suction & discharge connectors
• Integrated auxiliary pilot pump (built-in pilot oil supply unit for the compound pump)

III. Material Configuration & Core Technical Parameters

1. Materials of Core Components

• Pump Housing: High-strength FCD500 ductile cast iron, resistant to mining vibration and high-pressure impact; integrated casting of internal oil passages
• Piston & Cylinder Block: 20CrMnTi carburized alloy steel, tooth surface quenched to HRC60~64, excellent wear and scratch resistance
• Valve Plate: High-tin bronze wear-resistant alloy with static pressure balance structure, stable fitting under high pressure and ultra-low internal leakage
• Slippers & Return Plate: Copper-based anti-friction alloy with self-contained static pressure oil film lubrication
• Seals: Imported FKM fluoroelastomer, withstands hydraulic oil temperatures of 40~110℃, resistant to mineral hydraulic oil and aging
• Variable Valve Body: Precision die-cast aluminum alloy; valve spool tempered with 40Cr steel, free of sticking and responsive actuation

2. Key Performance Indicators

• Maximum Displacement per Single Pump: Meets high-flow demand of SY980H; total combined output flow of dual pumps: 2×586L/min
• Rated System Working Pressure: 34MPa, peak impact pressure: 38MPa
• Control Mode: Full electronic E-P+P-V dual-mode variable regulation, intelligent power matching between engine and pump
• Transmission Type: Dual pump driven by transfer case directly connected to engine flywheel with low power loss
• Operating Oil Temperature Range: -20℃ ~ +115℃, suitable for open-pit high-temperature mines and alpine cold mining sites
• Volumetric Efficiency: ≥94% (under rated working conditions), stable flow output without attenuation under long-term heavy loads

IV. Core Product Functions

1. Dual pumps supply combined independent high-pressure oil to multi-way valves for boom, arm, bucket, travel and swing circuits, delivering breakout forces of 495kN (bucket) and 469kN (arm);
2. Electronic variable control dynamically matches output power of Scania D16 engine, increasing displacement under heavy loads and reducing displacement under light loads to cut fuel consumption and lower heat generation;
3. Built-in integrated pilot auxiliary pump independently supplies pilot pressure to control joysticks for fast response and smooth operation;
4. Three built-in safety mechanisms including pressure cut-off, power limitation and overheat protection to avoid engine stall under overload and pump burnout;
5. Stable high-flow output without attenuation for high-intensity mining operations such as full-load continuous excavation, heavy-load climbing and non-stop truck loading.

V. Typical Replacement Scenarios for Faulty Pumps

1. Weak digging force, insufficient flow and severe engine stall due to excessive internal pump leakage detected via inspection;
2. Coolant leakage at the main shaft oil seal outside the pump body and large-area oil seepage from flange gaskets;
3. Persistent abnormal noise and violent vibration during pump operation caused by scratched or worn pistons / valve plates;
4. Malfunction of electronic variable solenoid valve leading to uncontrollable operation speed and failed pressure regulation;
5. Slipper detachment and swashplate wear caused by long-term high temperature, resulting in failed variable displacement function;
6. Preventive replacement of main pump assembly during machine overhaul and full hydraulic system maintenance.

VI. Applicable Model Specification

VII. Core Product Advantages

OEM-Grade Precise Matching

Heavy-Duty Mining Durability Design

Integrated Compound Design

Dual-Code Warehouse Management

Intelligent Power Matching

VIII. Commercial Supply Terms