eaton 7620 charge pump
2 month ago
Product details
1. Product Overview
TheEaton 7620 Charge Pumpis a dedicated charge pump designed by Eaton Hydraulics (formerly Vickers) for closed-loop hydraulic systems. Its primary functions include:
• Leakage Compensation: Replenishing hydraulic fluid lost due to friction and internal leakage in closed-loop circuits.
• Control Pressure Maintenance: Providing a stable low-pressure oil source for the control mechanisms (e.g., servo valves, proportional valves) of variable-displacement pumps/motors.
• Cooling and Lubrication: Reducing system temperature through forced circulation to extend component lifespan.
Typical Applications:
• Construction machinery (excavators, cranes, road rollers)
• Industrial vehicles (forklifts, loaders)
• Agricultural machinery (combine harvesters, tractors)
• Marine propulsion systems
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2. Technical Specifications
(1) Performance Specifications
【表格】
Parameter Value
Displacement 20 cm³/rev
Rated Pressure 28 bar (400 psi)
Peak Pressure 35 bar (500 psi)
Speed Range 600–3000 rpm (matches engine speed)
Flow Range 12–60 L/min (dependent on speed)
Operating Temp. -20°C to +120°C (requires low-temp oil)
Fluid Viscosity 10–400 cSt (recommended ISO VG32/46)
Filtration Req. NAS 6 (β₁₀≥75)
(2) Structural Features
• Gear Pump Design: External gear structure with high contamination resistance.
• Integrated Check Valve: Prevents backflow of hydraulic fluid.
• Lightweight: Aluminum body, weighing approximately 3.2 kg.
• Shaft Seal: Dual-lip seal to prevent leakage.
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3. Core Functions
(1) Charge Function
• Closed-Loop Compensation: Replenishes oil in the low-pressure side of variable-pump/motor systems via flush valves to prevent cavitation.
• Flow Matching: The 20 cm³/rev displacement meets the charge requirements of medium-sized construction machinery.
(2) Control Pressure Source
• Servo Control: Provides stable pressure (typically 20–25 bar) for the swashplate control mechanisms of variable pumps.
• Proportional Valve Drive: Compatible with electro-hydraulic proportional control, with a response time ≤50 ms.
(3) System Protection
• Overheating Prevention: Reduces oil temperature through forced circulation to prevent oxidation.
• Contamination Control: High filtration requirements (NAS 6) extend the lifespan of the main pump.
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4. Typical Application Scenarios
(1) Construction Machinery
• Excavators: Replenishes oil in the closed-loop circuits of slewing motors and travel motors, improving operational smoothness.
• Cranes: Maintains control pressure for luffing cylinders and slewing mechanisms to prevent load swing.
• Road Rollers: Compensates for leakage in the vibration wheel hydraulic system to ensure compaction quality.
(2) Industrial Vehicles
• Forklifts: Provides charge oil for the closed-loop drives of tilt cylinders and lift cylinders, enhancing fine-motion performance.
• Loaders: Maintains low-pressure control in the working device hydraulic system to reduce impact.
(3) Agricultural Machinery
• Combine Harvesters: Compensates for fluid loss in the hydraulic systems of header lift and drum drive mechanisms.
• Tractors: Provides cooling and lubrication for the closed-loop transmission systems of rear axles.
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5. Selection and Alternative Recommendations
(1) Alternative Models
• Higher Flow Demand:Eaton 7630(30 cm³/rev) or7645(45 cm³/rev).
• Lower Pressure Demand:Eaton 7610(rated pressure 21 bar).
• Compact Design:Eaton 7020 Series(integrated within variable pumps).
(2) Supporting Components
• Flush Valves: RecommendedEaton CSV-20 Seriesfor compatibility with the 7620 pump.
• Filters:Eaton TFL-10suction filter (10 μm) andTFL-3return filter (3 μm).
• Coolers: SelectEaton HFC Seriesair or water coolers based on system power.
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6. Common Issues and Solutions
(1) Insufficient Output Flow
• Causes:
• Pump speed too low (<600 rpm).
• Clogged suction line or filter.
• Internal wear (excessive gear clearance).
• Solutions:
• Verify engine speed is within rated range.
• Clean or replace suction filters.
• Disassemble pump to inspect gear wear.
(2) Pressure Fluctuations
• Causes:
• Stuck or leaking check valve.
• Excessive system backpressure.
• Abnormal fluid viscosity (too high or low).
• Solutions:
• Clean or replace check valves.
• Check for blocked return lines.
• Replace hydraulic fluid with appropriate viscosity (ISO VG32/46).
(3) Abnormal Noise
• Causes:
• Suction starvation (cavitation).
• Damaged gears or bearings.
• Misaligned coupling.
• Solutions:
• Ensure suction port is submerged ≥200 mm below oil level.
• Disassemble pump to replace damaged parts.
• Realign pump and drive shaft (tolerance ≤0.1 mm).
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