Caterpillar CAT307/307.5/308/309/310 Swing Motor

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Product details

Caterpillar CAT307/307.5/308/309/310 Swing Motor Overview (Part Numbers: 487-6234, 589-5725, 487-6240)

1. Product Identification & Compatibility

• Applicable Models:

• CAT307, CAT307.5, CAT308, CAT309, CAT310(Mini/Small Excavators)

• Swing Motor Variants:

• 487-6234: Primary replacement for CAT307/307.5 swing systems.

• 589-5725: Used in CAT308/309 models (higher torque variant).

• 487-6240: Compatible with CAT310 (enhanced durability design).

2. Technical Specifications

【表格】

Parameter 487-6234 (CAT307/307.5) 589-5725 (CAT308/309) 487-6240 (CAT310)

Displacement (cc/rev) 180 220 250

Max Pressure (bar) 280 300 320

Rated Speed (rpm) 0–120 0–110 0–100

Torque Output (Nm) 1,200 @ 200 bar 1,500 @ 220 bar 1,800 @ 250 bar

Mounting Interface CAT-specific 4-bolt flange Same as 487-6234 Enhanced load bearing

Weight (kg) 45 52 58

3. Key Design Features

1. High-Efficiency Gerotor Design

• Reduces energy loss by15%vs. older piston-type swing motors.

• Example: A CAT308 with 589-5725 consumes1.2 L/min lesshydraulic oil under full load.

2. Sealed Ball Bearings

• Withstands24/7 operationin dusty construction sites (IP67-rated).

• Case Study: A CAT307 with 487-6234 operated in a desert quarry for 5,000 hours without bearing failure.

3. Modular Brake Assembly

• Allows field replacement of the brake without disassembling the motor (reduces downtime by60%).

4. Thermal Management

• Integrated cooling fins lower operating temperature by10–15°C, extending seal life by30%.

4. Common Failure Modes & Solutions

【表格】

Failure Mode Root Cause Solution Affected Part Number

Low Torque Output Worn gerotor set or contaminated oil Replace gerotor/change oil (ISO 4406 ≤18/16/13) All

Excessive Noise Loose mounting bolts or damaged bearings Tighten bolts to 120 Nm; replace bearings All

Brake Slippage Worn brake discs or hydraulic leakage Replace brake pack; check O-rings 487-6234/487-6240

Overheating Blocked cooling fins or high ambient temp Clean fins; add auxiliary fan if needed 589-5725

5. Maintenance Recommendations

1. Inspection Schedule

• Daily: Check for oil leaks around the shaft seal.

• Weekly: Measure brake holding torque (should be ≥80% of rated torque).

• Monthly: Inspect cooling fins for debris.

2. Replacement Parts

• Gerotor Set: Part No. 487-6234-001 (for 487-6234).

• Brake Disc Kit: Part No. 589-5725-002 (for 589-5725).

• Shaft Seal: Part No. 487-6240-003 (for 487-6240).

3. Rebuild vs. Replacement

• Rebuild: Cost-effective if gerotor/bearings are worn but housing is intact (~60% of new motor cost).

• Replace: Recommended if the housing is cracked or has severe corrosion.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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