Sany 55 Swing Motor
3 month ago
Product details
Improved arrangement of components and decreased height enable installation under the driver's seat.No need for gear oil replacement.The lubricating system uses hydraulic operation oil for the reduction gear, eliminating the need for gear oil replacement. Parking brake can be built into the hydraulic motor, enabling safer parking on an incline.Shockless relief is standard equipment to enable smooth swing motor.
Compact structure: PCR series rotary motor adopts integrated design and small size, which is easy to install in space-constrained equipment.
High output torque: It can provide large torque output and is suitable for heavy-load working environment.
Precise positioning: High-precision rotation and positioning capabilities are achieved through hydraulic control.
High efficiency and energy saving: The internal optimization design reduces energy loss and improves work efficiency.
Strong durability: Made of high-quality materials, it is resistant to high pressure, has a long life and low maintenance requirements.
Compact structure: PCR series rotary motor adopts integrated design and small size, which is easy to install in space-constrained equipment.
High output torque: It can provide large torque output and is suitable for heavy-load working environment.
Precise positioning: High-precision rotation and positioning capabilities are achieved through hydraulic control.
High efficiency and energy saving: The internal optimization design reduces energy loss and improves work efficiency.
Strong durability: Made of high-quality materials, it is resistant to high pressure, has a long life and low maintenance requirements.
1. Product Overview
• Brand & Model:
• Sany 55: Refers to excavators (e.g., SY55C, SY55U) manufactured by Sany Heavy Industry, commonly used in small-to-medium construction projects.
• Nachi PCR-4B-20A: A hydraulic swing motor produced by Japan’s Nachi-Fujikoshi, designed to drive the rotational movement of an excavator’s upper structure.
• Function:
Converts hydraulic oil pressure into mechanical rotational force, enabling smooth and precise rotation of the excavator’s platform.
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2. Technical Specifications (Example, Verify with Official Data)
【表格】
Parameter Description
Model PCR-4B-20A
Compatible Models Sany SY55C/SY55U and other 55-ton excavators
Displacement Approx. 20 cc/rev (check manual)
Rated Pressure 25–30 MPa (adjustable per application)
Max Speed 10–15 rpm (no-load)
Braking System Hydraulic + mechanical (dual safety)
Weight Approx. 50–70 kg (varies by configuration)
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3. Applications
• Excavator Swing System:
• Controls left/right rotation of the upper structure (cab, boom, arm).
• Suitable for earthmoving, demolition, mining, and other tasks requiring frequent turning.
• Other Equipment(with adaptation):
• Cranes, drill rigs, and similar machinery requiring rotational functionality.
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4. Common Faults & Diagnosis
【表格】
Symptom Possible Causes Solutions
Weak rotation/slow speed Low hydraulic oil, clogged filter, internal leakage Check oil level, replace filter, repair/replace motor
Vibration/abnormal noise Worn bearings, gear misalignment Replace bearings, adjust gear clearance
Brake failure Faulty brake valve, contaminated oil Clean/replace brake valve, change oil
Hydraulic oil leakage Aged seals, damaged pipes Replace seals, repair/replace pipes
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5. Maintenance & Care Recommendations
• Daily Checks:
• Monitor hydraulic oil level and quality (replace every 500 hours).
• Inspect for leaks, unusual noise, or overheating.
• Periodic Maintenance:
• Clean hydraulic filters every 1,000 hours; replace if necessary.
• Inspect bearings and gears every 2,000 hours for wear.
• Precautions:
• Avoid high-load operation immediately after cold startup.
• Use ISO VG46 hydraulic oil compliant with Nachi standards.
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6. Parts & Alternative Models
• OEM Parts:
• Seal kits, bearings, and brake valves must be sourced from authorized Sany or Nachi suppliers.
• Alternative Models(confirm compatibility):
• Other Nachi PCR-4B series (e.g., PCR-4B-15A).
• Equivalent motors from Kayaba or Toyooki.
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7. Procurement & After-Sales
• Purchase Channels:
• Sany official parts centers, Nachi China distributors.
• Avoid non-standard or refurbished parts to ensure performance and safety.
• Warranty:
• Typically 6–12 months (subject to supplier policies); retain proof of purchase.
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8. Safety Warnings
• Release hydraulic system pressure before repairs to prevent high-pressure oil injection injuries.
• Align mounting holes precisely during motor replacement to avoid damage.
For detailed technical manuals or troubleshooting guides, contactSany Customer ServiceorNachi Technical Supportfor official assistance.
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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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