1. Model Breakdown
• Rexroth: Bosch Rexroth (Germany), a globally renowned manufacturer of hydraulic components.
• AP2D28:
• AP: Axial Piston Pump (design type).
• 2D: Series code, often linked to displacement or design version.
• 28: Theoretical displacement (28 cm³/rev), indicating output per revolution.
• LV1RS7:
• LV: May denote low-pressure variable pump or specific control method.
• RS7: Internal version/configuration code (e.g., swashplate angle, seal material).
• 790-0:
• 790: Likely production batch, factory number, or custom identifier.
• 0: Supplementary code, possibly indicating no additional features/standard configuration.
Note: Some codes may vary per Rexroth’s internal standards. Verify exact definitions via official channels.
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2. Key Technical Specifications
【表格】
Parameter Typical Value/Range Description
Displacement 28 cm³/rev Theoretical flow output per revolution, affecting maximum pump capacity.
Rated Pressure 280 bar (4060 psi) Continuous operating pressure; must match system requirements.
Peak Pressure 350 bar (5075 psi) Short-term maximum pressure; exceeding may cause damage.
Speed Range 600–2500 rpm Minimum/maximum operating speed; align with motor/engine specifications.
Control Method Variable displacement (pressure/flow compensation) Adjusts swashplate angle for energy efficiency or precise control.
Port Type SAE flange/BSP thread/DIN standard Must match system piping to prevent leaks.
Weight ~15–20 kg Consider mounting structure strength during installation.
Media Compatibility Mineral oil, synthetic hydraulic fluids (consult for HFA/HFB) Confirm viscosity and temperature range (typically -20°C to +80°C).
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3. Typical Applications
• Construction Machinery: Hydraulic systems for excavators, loaders, and rollers (e.g., propulsion, slewing, attachment control).
• Industrial Equipment: Pressure control in injection molding machines, die-casting machines, and metal forming presses.
• Agricultural Machinery: Hydraulic suspension systems for combine harvesters and tractors.
• Marine & Offshore: Deck machinery and steering gear power sources.
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4. Replacement Selection Guide
(1) Original Manufacturer Replacement
• Rexroth Authorized Channels:
• Contact Bosch Rexroth dealers with the full model number (AP2D28LV1RS7-790-0) to check inventory.
• Pros: Exact parameter match, reliable warranty.
• Cons: Higher cost, potentially longer lead times.
(2) Compatible Alternatives
• Equivalent Models from Other Brands:
• Parker PV Series: e.g., PV080 (similar displacement; verify pressure rating).
• Kawasaki K3V Series: e.g., K3V28DT (may require port size adjustments).
• HYDAC HAB Series: Some variable pumps suit low-pressure applications.
• Key Considerations:
• Cross-check displacement, pressure, and speed ratings.
• Confirm control method (e.g., pressure compensation support).
• Validate port dimensions and mounting space.
(3) Rebuilt/Remanufactured Pumps
• Applicable Scenarios: Budget constraints and urgent downtime needs.
• Selection Tips:
• Choose suppliers certified by Rexroth (e.g., authorized remanufacturing centers).
• Request test reports and warranty (typically 6–12 months).
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5. Replacement Process & Precautions
1. System Assessment:
• Diagnose root causes of original pump failure (e.g., contamination, overheating, pressure spikes) to prevent recurrence.
• Verify hydraulic fluid cleanliness (recommend NAS 1638 Class 7 or ISO 4406 18/16).
2. Installation Preparation:
• Clean the reservoir and piping; replace filters.
• Align couplings to avoid vibration or misalignment.
3. Commissioning & Monitoring:
• Post-installation checks: leaks, noise, and temperature (normal oil temp ≤80°C).
• Log pressure/flow data for comparison with the original pump.
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6. Common Issues & Solutions
• Issue 1: Insufficient Pressure After Replacement
• Causes: Mismatched displacement, incomplete swashplate adjustment, system leaks.
• Solutions: Calibrate displacement regulator; inspect piping seals.
• Issue 2: Pump Overheating
• Causes: High oil viscosity, inadequate cooling, internal leakage.
• Solutions: Use oil with proper viscosity; check coolers or airflow systems.
• Issue 3: Abnormal Noise
• Causes: Cavitation, worn bearings, misaligned coupling.
• Solutions: Clear suction lines; realign couplings and replace bearings.
