NACHI PCR-1B-05A Slewing Assembly
2 month ago
Product details
1. Product Overview
TheNACHI PCR-1B-05A Slewing Assemblyis an integratedslewing drive unitdesigned by NACHI Fujikoshi for construction machinery (e.g., excavators, cranes, drilling rigs). It integrates aslewing reducer, hydraulic motor, slewing bearing (ring gear), and sealing systemto enable 360° continuous rotation of the equipment’s upper structure. Its key advantages include high load capacity, low noise, and modular design for easy installation and maintenance.
2. Core Components & Functions
【表格】
Component Function Description
Slewing Reducer Planetary gear structure that converts high-speed, low-torque output from the hydraulic motor into low-speed, high-torque rotation for slewing.
Hydraulic Motor Drives the reducer with bidirectional rotation capability, typically axial piston or radial ball-type design.
Slewing Bearing Double-row roller bearing structure that withstands axial forces, radial forces, and overturning moments for stable rotation.
Sealing System Multi-lip seals + dust wiper to prevent lubricant leakage and ingress of external contaminants, extending service life.
Brake System Spring-applied, hydraulic-released brake (optional) for locking the slewing mechanism during shutdown.
3. Technical Specifications
【表格】
Parameter Typical Value for PCR-1B-05A
Rated Output Torque 50,000 N·m (model-dependent)
Slewing Speed 0–10 rpm (variable, dependent on hydraulic system flow)
Max. Overturning Moment 120,000 N·m (static)
Bearing Diameter φ800 mm (outer) × φ650 mm (inner)
Operating Pressure 25–32 MPa (system-dependent)
Recommended Hydraulic Oil ISO VG46 anti-wear hydraulic oil
Temperature Range -20°C to +60°C (low-temperature option available for -40°C startup)
Protection Grade IP65 (dust-tight and waterproof)
Weight Approx. 450 kg (including lubricant)
4. Applications
• Excavators: Slewing drives for medium-to-large excavators (e.g., 20–35-ton class).
• Cranes: Rotation systems for truck cranes and tower cranes.
• Drilling Rigs: Rotary positioning modules for rotary drilling rigs and DTH drills.
• Special Equipment: Slewing modules for aerial work platforms and fire trucks.
5. Performance Advantages
• High Reliability:
• Gearbox hardened via carburizing and quenching (HRC 58–62) for wear resistance.
• Precision-ground bearing raceways ensure uniform contact stress distribution.
• Energy Efficiency:
• Hydraulic motor efficiency ≥85% to reduce energy loss.
• Optional load-sensing control valves for automatic flow adjustment based on load.
• Maintenance Convenience:
• Modular design allows independent replacement of reducer and bearing.
• External lubricant fill port for quick refilling.
6. Selection & Compatibility
• Host Machine Matching:
• Select torque rating based on equipment weight, slewing radius, and operating intensity (e.g., PCR-1B series covers 30,000–80,000 N·m).
• Example: SY245 excavator slewing drive can use PCR-1B-05A; SY365 requires PCR-2B series.
• Interface Standards:
• Flange dimensions comply with ISO 10286 for direct mounting to host machine slewing discs.
• Hydraulic ports: G1/2" threads, compatible with SAE or DIN standard hoses.
7. Installation & Commissioning
1. Alignment Adjustment:
• Use laser alignment tools to ensure slewing assembly centerline deviation ≤0.1 mm from host machine centerline.
2. Bolt Tightening:
• Slewing bearing mounting bolts torque value: 800–1000 N·m (apply thread lock adhesive).
3. Hydraulic System Flushing:
• Flush pipelines with NAS Class 6 cleanliness hydraulic oil before installation to prevent metal particle damage to the motor.
4. Initial Lubrication:
• Fill slewing bearing with lithium-based grease (NLGI Grade 2) to 1/2 of raceway volume.
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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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