Sany/Kobelco Excavator Swing Motor/Travel Motor

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

3 year

Product details

1. Product Definition & Functions

Swing Motor

• Function: Drives the 360° rotation of the excavator’s upper structure (cab and attachment), enabling slewing motions.

• Structure: Typically a hydraulic radial piston motor, integrated with a brake, reduction gearbox, and sealing system.

• Key Specifications:

• Displacement: 100–250 cc/rev (model-dependent).

• Pressure Rating: 25–35 MPa (continuous operation).

• Speed Range: 0–15 RPM (low-speed, high-torque design).

• Brake Type: Spring-Applied Hydraulic Release (SAHR).

Travel Motor

• Function: Powers the excavator’s tracks or wheels for mobility.

• Structure: Axial piston motor + planetary gearbox, integrated with brakes and lubrication systems.

• Key Specifications:

• Displacement: 200–500 cc/rev (high-displacement design).

• Output Torque: 50–150 kN·m (continuous).

• Reduction Ratio: 30:1–60:1 (terrain-adaptive).

• Protection Class: IP67 (dust/waterproof).

2. Brand & Model Compatibility

Sany Heavy Industry

• Typical Models:

• SY215C: Swing Motor (125 cc/rev), Travel Motor (250 cc/rev).

• SY365H: High-torque Swing Motor for mining applications.

• SY600C: Dual Travel Motor design for enhanced climbing capability.

• Technical Features:

• High-pressure hydraulic system for improved efficiency.

• Modular design for easy maintenance.

Kobelco Construction Machinery

• Typical Models:

• SK210LC-10: Swing Motor with electronic control for precision slewing.

• SK350LC: Travel Motor with dual-speed shifting for versatile terrain.

• SK850LC: Ultra-large Travel Motor (120 kN·m torque).

• Technical Features:

• Lightweight design for reduced energy consumption.

• Durability-optimized for harsh environments.

3. Common Failures & Solutions

Swing Motor Issues

• Failure 1: Weak or jerky slewing.

• Causes: Contaminated hydraulic oil, unreleased brake, internal wear.

• Solutions: Replace hydraulic oil, inspect brake valve, repair/replace motor.

• Failure 2: Abnormal noise during rotation.

• Causes: Bearing damage, gear wear, seal degradation.

• Solutions: Replace bearings/gears, install new seals.

Travel Motor Issues

• Failure 1: Vehicle veers during travel.

• Causes: Mismatched speed between dual Travel Motors, hydraulic leaks.

• Solutions: Calibrate motor speeds, inspect hydraulic lines.

• Failure 2: Loss of traction.

• Causes: Insufficient motor displacement, worn gearbox.

• Solutions: Adjust displacement, replace gearbox.

4. Maintenance & Parts Guide

Critical Components

• Swing Motor:

• Brake Assembly.

• Shaft Seal Kit.

• Planetary Gear Set.

• Travel Motor:

• Planetary Gear Set.

• Brake Lining.

• O-Ring Set.

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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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