Yuchai 85 / Liugong 908 Swing Motor

Yuchai 85 / Liugong 908 Swing Motor

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 3 year year

Product details

1. Basic Product Information

Model: Yuchai 85 / Liugong 908 Swing Motor

Brand Association:

• Yuchai 85: Produced by Guangxi Yuchai Machinery Co., Ltd. (Yuchai Group), likely a hydraulic system component compatible with Yuchai engines or construction machinery.

• Liugong 908: Used in Liugong’s 908 series compact excavators (e.g., CLG908C/908D).

Application Machines:

• Primarily fits Liugong 908 series excavators (8–10-ton operating weight). Also compatible with retrofitting for similar-sized models from other brands.

2. Core Specifications & Technical Parameters

【表格】

Parameter Category Details

Type Axial piston hydraulic motor (with brake)

Displacement ~45–65 mL/r (varies by version, e.g., CLG908C vs. CLG908D)

Rated Pressure 25–28 MPa (system pressure; peak up to 32 MPa)

Speed Range 0–15 rpm (low-speed, high-torque design for slewing motions)

Output Torque Continuous: ~3,200–4,500 N·m; Peak: ~5,000 N·m (varies with pressure)

Brake Type Hydraulic-release/spring-applied (normally closed; braking torque ≥1.2× rated torque)

Lubrication Forced lubrication (dependent on system hydraulic oil circulation)

Weight ~85–105 kg (including brake and mounting flange)

3. Structural Features

• Dual-Shaft Seal Design: Combines high-pressure骨架油封 (bonded seals) and dust-proof rings to prevent oil leakage and contamination.

• Modular Brake Assembly: Brake and motor body are separated for easy maintenance.

• High-Strength Housing: Cast iron or aluminum alloy housing for impact resistance.

• Multi-Size Mounting Interfaces: Supports SAE standard flanges or Liugong-specific interfaces for cross-brand compatibility.

4. Compatible Machines & System Requirements

Primary Compatible Models:

• Liugong CLG908C, CLG908D, CLG908F excavators

• Cross-Compatibility: May replace swing motors in similar-sized models (e.g., Sany SY75C, XCMG XE80C) after verifying mounting dimensions and pressure matching.

Hydraulic System Requirements:

• Fluid Type: Anti-wear hydraulic oil (ISO VG 46, for -20°C to +50°C environments)

• Cleanliness Level: NAS 1638 Class 9 or ISO 4406 20/18/15

• System Flow: Recommended pump flow: 60–80 L/min (for stable motor speed)

5. Common Failures & Solutions

【表格】

Symptom Possible Causes Solutions

Weak/slow slewing Low system pressure, internal leakage, brake not released Check main pump pressure, replace worn pistons, adjust brake valve

Slewing vibration/noise Bearing damage, spline wear, oil contamination Replace bearings/spline sleeves, clean system, and change oil

Brake failure Stuck brake piston, broken spring Clean brake, replace springs/seals

Motor housing oil leak Aged seals, housing cracks Replace seals, weld-repair housing (if needed)

6. Maintenance Recommendations

• Daily Checks:

• Inspect oil level and contamination every 250 hours; clean radiators.

• Check brake flexibility and measure clearance every 500 hours (standard: 0.5–1.0 mm).

• Periodic Replacements:

• Change hydraulic oil and filters every 1,000 hours (filter precision ≤10 μm).

• Disassemble and inspect motor every 2,000 hours; replace worn parts (e.g., pistons, port plates).

• Long-Term Storage:

• If idle for >30 days, run motor for 10 minutes weekly to prevent internal corrosion.

7. Parts Compatibility Notes

• Alternative Models:

• Liugong OEM: 908C-Swing Motor Assembly (Part No. 21N-86000)

• Third-Party: KYB MSF-08, NACHI IPH-5B (verify mounting dimensions)

• Critical Seals:

• Shaft seal: TCV 45×65×12 (dual-lip design)

• O-ring: VMQ 70 Shore A (oil-resistant material)

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

3 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump , hydraulic valve , hydraulic winch, hydraulic system

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