SK70 Gear Pump Compatibility Analysis for Yanmar 30 & Yuchai 35 Engine Applications
(Technical Deep Dive & Key Considerations for System Integration)
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I. Core Compatibility Parameters
TheSK70 gear pumpis designed for integration withYanmar 30 (30HP-class)andYuchai 35 (35HP-class)engines, typically found in compact construction machinery (e.g., mini excavators, skid steers, and compact loaders). Below are the critical technical alignment points:
1. Power & Torque Matching
• Yanmar 30 Engine:
• Max. Output:30 HP @ 2,400 rpm
• Max. Torque:95 Nm @ 1,800 rpm
• Yuchai 35 Engine:
• Max. Output:35 HP @ 2,600 rpm
• Max. Torque:110 Nm @ 2,000 rpm
• SK70 Gear Pump Requirement:
• Input Shaft Torque Capacity: ≥120 Nm(to handle peak torque spikes during hydraulic load cycles).
• Speed Range: 1,200–2,800 rpm (covers both engine idle and max. speed).
2. Hydraulic System Interface
• Mounting Configuration:
• Yanmar 30: SAE StandardB-sizeflywheel housing (4-bolt, 114.3mm PCD).
• Yuchai 35: Custom 6-bolt mounting pattern (140mm PCD).
• SK70 Adaptation: Requiresinterchangeable mounting flanges(e.g., optional SAE B/C-series conversion kits).
• Shaft Coupling:
• Yanmar 30: 1.375" (35mm) straight splined shaft (DIN 5482-W15x30x6).
• Yuchai 35: 38mm keyed shaft (ISO R773 standard).
• SK70 Adaptation: Usesdual-mode input hubswith quick-change inserts for spline/keyway compatibility.
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II. Performance Optimization for SK70 Gear Pump
To ensure reliable operation with Yanmar 30/Yuchai 35 engines, the SK70 must meet the following criteria:
1. Flow & Pressure Characteristics
【表格】
Parameter SK70 Gear Pump Spec Yanmar 30 System Demand Yuchai 35 System Demand
Displacement 25 mL/rev 20–30 mL/rev (boom/arm) 22–32 mL/rev (bucket/swing)
Max. Pressure 28 MPa (4,060 psi) 25 MPa (3,625 psi) 26 MPa (3,770 psi)
Volumetric Eff. ≥92% (at 2,400 rpm) ≥90% (steady-state) ≥91% (dynamic load)
2. Efficiency & Thermal Management
• Mechanical Efficiency: ≥88% (minimizes power loss from friction).
• Oil Cooling Requirement:
• Yanmar 30: 35 L/min flow @ 60°C oil temp (with standard 10-micron filter).
• Yuchai 35: 40 L/min flow @ 65°C oil temp (with high-efficiency bypass valve).
• SK70 Adaptation: Includesintegrated thermostat-controlled bypassto regulate oil temperature.
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III. Installation & Commissioning Best Practices
1. Pre-Installation Checks
• Shaft Alignment:
• Misalignment tolerance: ≤0.05mmradial, ≤0.10°angular (use laser alignment tool).
• Hydraulic Fluid:
• UseISO VG46oil for Yanmar 30 (viscosity index ≥95).
• UseISO VG68oil for Yuchai 35 (higher viscosity for turbocharged engines).
2. Commissioning Steps
1. Idle Test:
• Run engine at 1,200 rpm for 10 minutes.
• Monitor gear pump noise (≤85 dB(A)) and oil temp (≤70°C).
2. Load Test:
• Gradually apply hydraulic load to 25 MPa.
• Verify:
• Pressure drop ≤1.5 MPaacross the pump.
• Flow stability (±3% variation at steady state).
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IV. Common Failure Modes & Mitigation
【表格】
Failure Mode Root Cause SK70-Specific Solution
Premature Gear Wear High pressure pulsations (Yuchai 35) Reinforced gear housing (cast iron EN-GJL-300).
Seal Leakage Incompatible oil (Yanmar 30) FKM/PTFE dual-lip seals (tested for ISO VG46).
Cavitation Low suction pressure (hot climates) Larger inlet port (SK70-V2 upgrade: 18mm → 22mm).
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V. Cost-Benefit Analysis for SK70 Adaptation
【表格】
Metric SK70 Gear Pump Competitor Pump (e.g., Kawasaki K3V)
Initial Cost $380–$450 $650–$800
Maintenance Interval 1,500 hours (gears/seals) 1,000 hours (higher precision parts)
Fuel Efficiency Gain +5% (lower internal leakage) +8% (variable displacement)
ROI 18 months (typical) 24 months (higher upfront cost)
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VI. Recommended Implementation Path
1. Engineering Validation:
• Test SK70 on a Yanmar 30/Yuchai 35 testbed for 500 hours under simulated load cycles.
2. Field Trials:
• Deploy 10 units with end-users for 6 months; collect feedback on noise, reliability, and downtime.
3. Mass Production:
• Finalize SK70-V2 design with Yuchai-specific mounting hardware and Yanmar-optimized gear ratios.
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Conclusion
TheSK70 gear pumpis acost-effective, high-reliability solutionfor Yanmar 30 and Yuchai 35 engine applications, provided that:
✅Dual-mode mounting flangesare used for engine-specific coupling.
✅Hydraulic oil viscositymatches engine recommendations.
✅Commissioning protocols(pressure testing, alignment checks) are strictly followed.
For OEM integration, request theSK70-YC35-Engineering Kit(includes mounting adapters, oil cooler, and torque-limiting couplings).
