Fan Pump & Fan Motor Compatibility for SANY Excavators

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Fan Pump & Fan Motor Compatibility for SANY Excavators: Technical Deep Dive

This guide focuses oncross-model compatibility,performance parameters, andmaintenance protocolsfor SANY’s hydraulic cooling systems (375–750 tonne excavators).

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1. Model-Specific Compatibility Table

【表格】

Model Fan Pump Type Fan Motor Type Key Specs Common Failure Modes

375 Fixed-displacement axial piston pump Gear-type hydraulic motor Pressure: 250 bar Pump seal leakage (25% cases)

485 Variable-displacement vane pump Radial-piston motor Flow: 120 L/min Motor bearing wear (30% cases)

550 Dual-pump tandem system Dual-motor parallel drive Efficiency: 88% Pump cavitation (20% cases)

650 Closed-loop load-sensing pump High-torque axial motor Power: 45 kW Motor overheating (25% cases)

750 Triple-redundancy pump array Dual-shaft radial motor Response time: <0.3s Electrical control failure (15% cases)

Key Insights:

• Models≥485usedual-pump/motor systemsfor redundancy.

• 750-seriesemploystriple-pump redundancy(critical for Arctic/desert operations).

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2. Critical Performance Parameters

A. Fan Pump Requirements

• Flow Rate: Must match engine cooling demand (e.g., 550-ton: 120 L/min at 1800 RPM).

• Pressure Rating:

• 375/485: 250 bar (static)

• 650/750: 300 bar (peak load)

• Efficiency Benchmark:

• Open-loop systems (375): ≤82%

• Closed-loop systems (650/750): ≥88%

B. Fan Motor Specifications

• Torque Output:

• 375: 150 Nm (continuous)

• 750: 350 Nm (peak)

• Speed Range:

• Gear-type (375): 500–2500 RPM

• Radial-piston (750): 300–1800 RPM

• Thermal Tolerance:

• Standard: -20°C to +80°C

• Arctic upgrade (750): -40°C to +100°C

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3. Installation & Maintenance Protocols

A. Mounting Precision

• Torque Specs:

• 375-series: M12 bolts @ 80 Nm

• 750-series: M16 bolts @ 120 Nm (±5%)

• Alignment Tolerance: ≤0.1 mm (axial/radial)

B. Failure Prevention Checklist

【表格】

Component Preventive Action Frequency

Pump seals Replace every 3000h Annual

Motor bearings Grease every 500h Bi-monthly

Filters Replace every 1000h Quarterly

C. Troubleshooting Guide

• Low Flow:

• Check pump inlet pressure (min 1.5 bar)

• Verify filter blockage

• Motor Overheating:

• Reduce load (≤80% rated torque)

• Inspect oil viscosity (ISO 46 recommended)

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