A4VG90 Charge Pump 13T
5 day ago
Product details
1. Model Breakdown
• A4VG90:
• A4VG: Rexroth axial piston variable pump series code, designed for closed-loop hydraulic systems.
• 90: Displacement specification (unit: cm³/rev), indicating a displacement of 90 mL per revolution.
• Charge Pump 13T:
• Charge Pump: A pump that supplies supplemental oil to closed-loop circuits for cooling, lubrication, and pressure maintenance.
• 13T:
• 13: Displacement of the charge pump (unit: cm³/rev), i.e., 13 mL per revolution.
• T: May denote a design variant (e.g., structural optimization, seal improvements). Refer to Rexroth’s official documentation for confirmation.
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2. Core Functions
Key Roles of the Charge Pump:
1. Leakage Compensation:
• In closed-loop systems, the main pump (A4VG90) and hydraulic motors experience internal leakage. The charge pump continuously replenishes oil to maintain stable system pressure.
2. Cooling & Lubrication:
• Cools the main pump and motors via the charge oil circuit while lubricating friction components (e.g., bearings, port plates).
3. Control Oil Supply:
• Provides pressurized oil for the variable displacement mechanism (e.g., proportional solenoids, servo valves), ensuring precise main pump displacement control.
4. Flushing Function:
• Some designs introduce fresh oil through the charge pump to flush contaminants, extending component lifespan.
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3. Technical Specifications (Typical Values)
【表格】
Parameter A4VG90 Charge Pump 13T Notes
Displacement 13 cm³/rev Fixed-displacement gear pump
Rated Pressure 25 bar (up to 30 bar in some models) Must be lower than main pump’s maximum pressure
Max Speed 3000 rpm (shared with main pump’s drive shaft) Depends on drive-end design
Flow Range 0–39 L/min (13 × 3000 / 1000) Actual flow affected by speed and viscosity
Fluid Temperature -20°C to +80°C Use low-viscosity oil (e.g., ISO VG32) at low temperatures
Filtration NAS 1638 Class 7 (ISO 4406 18/16/13) Equivalent to 10 µm absolute filtration
Weight ~2.5 kg (includes gear set, shaft, housing) Lightweight design
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4. Structural Features
• Gear Pump Design:
• External gear pump with simple structure and low cost, suitable for low-pressure charge applications.
• Gears made of high-strength alloy steel with surface hardening for wear resistance.
• Integrated Design:
• Mounted directly on the rear of the A4VG90 main pump, sharing the drive shaft to reduce space.
• Connected to the main pump’s closed loop via internal oil passages, eliminating external piping.
• Sealing & Durability:
• Shaft seals use fluororubber (FKM) or polytetrafluoroethylene (PTFE) for high-temperature and chemical resistance.
• Split housing design for easy gear set replacement during maintenance.
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5. Typical Applications
Construction Machinery:
• Excavators:
• Provides continuous oil to travel and swing motors, preventing power loss due to leakage.
• Cranes:
• Stabilizes pressure in luffing and hoisting closed-loop systems for smooth operation.
Industrial Equipment:
• Injection Molding Machines:
• Supports hydraulic clamping systems with reliable pressure to prevent mold opening.
• Die-Casting Machines:
• Maintains high-pressure sealing in clamping mechanisms to reduce oil leakage.
Agricultural Machinery:
• Combine Harvesters:
• Supplies reliable oil to header lifting and travel drives for harsh field conditions.
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6. Common Failures & Troubleshooting
【表格】
Symptom Possible Causes Solutions
Low Charge Pressure Worn gears, clogged inlet, stuck relief valve Replace gears, clean filter, service relief valve
Flow Fluctuations Loose drive shaft, excessive gear clearance Tighten drive shaft, adjust gear backlash
Abnormal Noise Bearing failure, cavitation, contaminated oil Replace bearings, check oil level, replace hydraulic fluid
Housing Leakage Aged seals, housing cracks Replace seals, weld repair housing
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
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3 year
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