I. Product Overview
TheJRR Series Hydraulic Pumpsarevariable-displacement piston pumpsin Danfoss's industrial hydraulic lineup, designed for high-pressure, high-efficiency systems. They are widely used in construction machinery, agricultural equipment, and industrial applications.
• Model Range: JRR 045, JRR 060, JRR 065, JRR 074
• Key Features:
• Variable displacement control (adjustable pressure/flow) for dynamic load adaptation.
• High-pressure ratings (up to 350 bar, depending on model).
• Compact design for space-constrained installations.
• Low noise, long service life, and low maintenance costs.
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II. Technical Specifications Comparison
【表格】
Model Displacement (cc/rev) Rated Pressure (bar) Peak Pressure (bar) Speed Range (rpm) Weight (kg)
JRR 045 45 280 350 600–2,500 18
JRR 060 60 280 350 600–2,500 22
JRR 065 65 280 350 600–2,500 24
JRR 074 74 280 350 600–2,500 26
Key Notes:
• Higher displacement = Greater flow output (Flow = Displacement × Speed).
• Rated pressure = Continuous operating pressure; Peak pressure = Short-term maximum.
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III. Core Functions & Applications
1. Variable Control Technology:
• Adjusts swashplate angle for stepless flow variation, suitable for dynamic loads (e.g., excavator arm movement, die-casting machine clamping).
• Supports pressure-compensated control, improving system efficiency by 15%–20%.
2. Typical Applications:
• Construction Machinery: Excavators, loaders, cranes.
• Agricultural Equipment: Combine harvesters, irrigation systems.
• Industrial Machinery: Injection molding machines, metal presses.
3. Compatibility:
• Integrates with Danfoss PVG series valves and H1 series motors for complete hydraulic systems.
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IV. Selection Guidelines
1. Flow Requirement Calculation:
• System flow (L/min) = Displacement (cc/rev) × Speed (rpm) ÷ 1,000.
• Example: JRR 060 at 1,500 rpm = 60 × 1,500 ÷ 1,000 =90 L/min.
2. Pressure Matching:
• Ensure rated pressure ≥ System maximum pressure (with 10%–20% margin).
3. Installation & Interfaces:
• Verify shaft dimensions (e.g., SAE A/B/C splines) match motor/engine.
• Check inlet/outlet port sizes (e.g., G1/2, G3/4 threads).
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V. Maintenance & Troubleshooting
1. Routine Maintenance:
• Monitor oil cleanliness (NAS 6 grade or better).
• Replace hydraulic oil and filters every 2,000 hours.
2. Common Issues:
• Low Flow: Causes include swashplate jamming, suction line leaks, or high oil viscosity.
• Excessive Noise: Check coupling alignment, pump shaft bending, or air in oil.
3. Spare Parts:
• Critical components (swashplate, piston shoes, port plate) must be sourced from authorized Danfoss distributors.