R480LC-9S Slewing Assembly
2 month ago
Product details
1. Product Overview
TheR480LC-9S Slewing Assemblyis the core component of the swing system for Hyundai R480LC-9S hydraulic excavators, enabling 360° continuous rotation of the upper structure (cab, working attachment). This assembly integrates a high-precision slewing ring, drive gear, hydraulic motor interface, and sealing system to ensure smooth, low-noise, and durable rotation.
Applicable Model: Hyundai R480LC-9S Excavator (38-ton class medium machine)
Compatible Models: Partial compatibility with Hyundai R480LC-7/R480LC-9 series (confirm gear module matching).
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2. Structural Components & Functions
Core Components
【表格】
Component Function Description
Slewing Ring Double-row roller bearing structure. Carries upper structure weight and swing torque. Inner gear meshes with drive pinion.
Drive Gear (Pinion) Straight/helical gear design. Meshes with slewing ring inner gear to transmit hydraulic motor power. Module typically 8-10mm.
Hydraulic Motor Port Integrated spline shaft or flange connection. Compatible with Kawasaki K3V112/Rexroth A10VSO71 hydraulic motors.
Sealing System Multi-stage lip seals + dust wiper. Prevents mud/water ingress into bearing housing.
Lubrication System Manual grease fitting or automatic central lubrication port. Recommends EP2 lithium grease.
Auxiliary Components
• Brake Unit: Spring-applied, hydraulic-released parking brake. Prevents slippage during stops.
• Buffer Blocks: Polyurethane dampers. Reduces impact at swing end positions.
• Test Ports: Pressure measurement interfaces for system diagnostics.
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3. Key Technical Specifications
【表格】
Parameter Specification
Rated Swing Torque 120-150 kN·m (adjustable per hydraulic motor model)
Max Swing Speed 8-12 rpm (no-load)
Slewing Ring Diameter φ800-900mm (design-dependent)
Gear Module 8mm (standard), 10mm (heavy-duty optional)
Operating Temp Range -30°C to +60°C (low-temp seals available for -40°C)
Lubrication Interval Every 500 hours (250 hours for severe conditions)
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4. Common Failures & Diagnostics
Symptoms
• Swing Vibration/Noise: Worn drive gear, pitted slewing ring raceway, insufficient lubrication.
• Weak Swing: Hydraulic motor internal leakage, incomplete brake release, excessive gear backlash.
• Oil Leakage: Aged seals, housing cracks, overfilled grease.
• Swing Jamming: Contaminated bearing cavity, broken gear tooth, seized brake.
Diagnostic Process
1. Visual Inspection: Clean grease, check for leaks, inspect gear teeth for chips.
2. Pressure Test: Measure swing system pressure at test ports (normal: 180-220bar).
3. Backlash Measurement: Use feeler gauges to check pinion-to-ring gear side clearance (standard: 0.3-0.5mm).
4. Auscultation: Use stethoscope to localize noise (bearing raceway vs. gear mesh zone).
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5. Installation & Maintenance Standards
Installation Requirements
• Flatness Tolerance: Mounting surface flatness error ≤0.2mm/m (prevents misalignment).
• Bolt Torque: High-strength bolts (Grade 10.9) tightened crosswise in 3 stages to specified torque (e.g., M24×1.5: 800-900N·m).
• Alignment Adjustment: Axial offset between drive gear and slewing ring ≤0.1mm.
Maintenance Schedule
【表格】
Maintenance Item Interval Task Description
Grease Replenishment Every 500 hrs Clean old grease, fill until overflow at fitting (~200-300g).
Gear Mesh Inspection Every 1000 hrs Measure backlash, apply red lead powder to verify contact pattern (60%+ tooth height).
Seal Replacement Every 2000 hrs Replace lip seals and dust wipers. Inspect housing for cracks.
Slewing Ring Overhaul Every 4000 hrs Disassemble to inspect raceway wear. Replace assembly if diameter wear >5%.
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
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3 year
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