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Eaton Genuine 6K Series Hydraulic Orbit Motor
Technical Analysis & Application Guide
I. Key Features & Performance Advantages
1. High Torque Density & Compact Design
• Gerotor Technology:
• Utilizes an internal gear ring meshing with an external rotor, achieving20%-30% higher torque outputthan conventional gear motors in the same footprint.
• Ideal for compact spaces in construction machinery (e.g., rotary drilling rigs, crawler chassis) and agricultural equipment (e.g., harvester drive wheels).
• Example:
The6K-100model delivers120 Nm torque at 15 MPawhile occupying60% of the volumeof a comparable piston motor.
2. Wide Speed Range & High Efficiency
• Dual-Speed Configuration:
Some models (e.g.,6K-150L/H) supportlow-speed (0-150 rpm)for heavy-load startups andhigh-speed (150-450 rpm)for light-load operations.
• Efficiency Curve:
Maintains≥92% volumetric efficiencyand≥88% mechanical efficiencyacross10%-100% load ranges, minimizing hydraulic system heating.
3. Enhanced Reliability & Durability
• Sealing & Bearing Reinforcement:
Features adual-lip shaft seal + floating bearingstructure, achieving>5,000-hour continuous runtime(ISO 19772) and passingsalt spray tests(ASTM B117).
• Material Upgrades:
Rotor and stator made ofhigh-chromium alloy steel (HRC 58-62), offering3x wear resistanceover cast iron, suitable for harsh mining conditions.
II. Technical Specifications & Selection Guide
【表格】
Parameter Category Typical 6K Series Values Application Recommendations
Displacement Range 60–300 ml/rev (customizable non-standard options) Small displacements (60–120 ml) for light-duty (e.g., aerial work platforms); large displacements (200 ml+) for heavy-duty (e.g., vibratory rollers).
Max Speed 600 rpm (peak short-term) Match hydraulic system flow to avoid cavitation.
Operating Pressure Rated 25 MPa, peak 35 MPa Recommend ≤80% of rated pressure for extended lifespan.
Port/Shaft Options SAE flange/BSPT thread/keyed shaft (optional spline shaft) Select flange size (e.g., SAE B) based on system layout.
Selection Formula:
• Theoretical Torque (Nm)= Displacement (ml/rev) × System Pressure (MPa) × 0.159
• Recommended Safety Factor:
• 1.5 for heavy-duty
• 1.2 for light-duty
III. Typical Applications & Case Studies
1. Construction Machinery
• Rotary Drilling Rig Swing Motor:
The6K-250delivers380 Nm torque at 30 MPa, driving drill pipe rotation withISO 13563-compliant impact resistance.
• Crawler Crane Travel Motor:
Dual6K-100motors in parallel enable0–5 km/h stepless speed controland≥35° climbing capability.
2. Agricultural Machinery
• Combine Harvester Header Drive:
The6K-80integrates into a compact gearbox, achieving0.2–0.8 m/s adjustable header lift speedwith≤85 dB(A) vibration noise.
3. Industrial Equipment
• Hydraulic Winch:
The6K-120paired with a proportional valve provides0–500 Nm precise torque controlwith±1% speed accuracyfor wire rope handling.
IV. Maintenance & Troubleshooting
1. Scheduled Maintenance
• Hydraulic Oil Cleanliness:
Must meetNAS 1638 Class 9standards; replace filters (10 μm) every500 hours.
• Shaft Seal Inspection:
Check for leakage ≤5 ml/min (under 20 MPa) every2,000 hours.
2. Common Faults & Solutions
• Issue 1: Reduced Speed
• Cause: High oil viscosity (temperature < -10°C) or clogged inlet filter.
• Fix: Use low-temperature hydraulic oil (ISO VG 32) or clean the filter.
• Issue 2: Abnormal Noise
• Cause: Worn bearings or excessive rotor/stator clearance (>0.05 mm).
• Fix: Replace bearing assemblies or factory-repair the gerotor pair.
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
3 year
Main Product:
hydraulic motor,
gear box,
hydraulic pump,
hydraulic valve ,
hydraulic winch,
hydraulic system
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