6E-5072 Caterpillar 140G Piston Pump 250bar

Product Overview

The 6E-5072 (6E5072) is the main hydraulic pump assembly (PUMP GP-PISTON) for the Caterpillar 140G Motor Grader. This swashplate-type axial piston variable displacement pump delivers reliable high-pressure oil supply for blade lift/tilt/sideshift, steering, and attachment hydraulic systems.

The 6E-5072 is compatible with the following Caterpillar cross-reference part numbers, allowing customers to select based on inventory and procurement preferences:

• 6E-1278 (6E1278) — Fits CAT 120G/130G/140G/160G Motor Graders

• 6E-1412 (6E1412) — Fits CAT 120G/130G/140G/160G Motor Graders

• 6E-6562 (6E6562) — Fits CAT 5230/5230B Excavators and 120G/130G/140G Graders

• 0R-7661 (0R7661) — Replacement part number

• CA6E5072 / CA0R7661 — Aftermarket alternative numbers

As a direct OEM-equivalent replacement solution for the Caterpillar 6E-5072 main pump, this product offers complete in-situ interchangeability, strictly adhering to Caterpillar’s original design specifications and mounting interface standards. Every unit undergoes 100% simulated duty-cycle testing, ensuring that key performance metrics—including volumetric efficiency, pressure-flow characteristics, and case drain flow at rated pressure and full displacement—meet or exceed original factory specifications.

Technical Specifications (Bulleted List)

• Primary Part Number: 6E-5072 (6E5072)

• Cross-Reference Part Numbers: 6E-1278 / 6E-1412 / 6E-6562 / 0R-7661 / CA6E5072 / CA0R7661

• Brand Series: Caterpillar 140G Motor Grader

• Pump Type: Swashplate Axial Piston Variable Displacement Pump

• Displacement Range: 8.2–280 cc/rev (adjustable for variable displacement pumps)

• Operating Pressure: High Pressure

• Mounting Type: OEM Standard Flange Mounting

• Design Features: Axial piston variable pump, compact design

• Applicable Models: Caterpillar 120G / 130G / 140G / 160G Motor Graders

• Weight: Approx. 48 kg (106 lb)

Key Technical Advantages

1. Dedicated Main Pump Design for 140G Motor Grader Precision Applications
The 6E-5072 is the dedicated main pump assembly for the Caterpillar 140G Motor Grader, delivering stable and reliable hydraulic power for blade control, steering, and attachment systems. Motor grader operations demand exceptional precision and response speed from the hydraulic system—blade micro-adjustments, smooth sideshift movements, and precise steering all depend on stable flow output from the main pump.

2. Axial Piston Variable Displacement Design for On-Demand Flow
The 6E-5072 features a swashplate axial piston variable displacement design with an adjustable displacement range of 8.2–280 cc/rev. The variable pump automatically adjusts output flow based on load demand, delivering on-demand oil supply that effectively reduces overflow losses and fuel consumption.

3. Broad Cross-Reference Compatibility
The 6E-5072 is compatible with multiple Caterpillar part numbers including 6E-1278, 6E-1412, 6E-6562, and 0R-7661. This broad cross-reference coverage enables customers to select based on existing inventory and procurement channels, effectively reducing parts management complexity and procurement risk.

4. 48 kg Lightweight Design for Easy Installation and Maintenance
The 6E-5072 weighs approximately 48 kg (106 lb) . This weight offers excellent maintainability among motor grader main pumps in its class, facilitating on-site installation and removal, reducing maintenance downtime.

Application Areas

• Caterpillar 140G Motor Grader (Primary Application): Main hydraulic pump providing power for blade lift/tilt/sideshift and steering systems

• Caterpillar 120G / 130G / 160G Motor Graders: Main hydraulic pump assembly

• Caterpillar 12G Motor Grader: Main hydraulic pump assembly

• Heavy Construction Equipment Hydraulic System Maintenance: Fits Caterpillar G Series motor grader hydraulic systems

Expert Maintenance Tips

1. Model Confirmation & Pre-Installation Inspection: Prior to installation, confirm the equipment is a Caterpillar 120G/130G/140G/160G Motor Grader and verify the original pump part number is 6E-5072 (6E5072) or one of its cross-references (6E-1278 / 6E-1412 / 6E-6562 / 0R-7661). The pump weighs approximately 48 kg (106 lb) —ensure lifting equipment and mounting brackets have adequate load capacity. Manually rotate the shaft before installation to confirm smooth, obstruction-free rotation.

2. Fluid Cleanliness Control: Use high-quality hydraulic oil meeting Caterpillar specifications. A minimum filtration rating of ISO 18/15 is recommended. Motor graders typically operate in high-dust environments—complete system flushing is mandatory before initial start-up.

3. Variable Pump Tuning: The 6E-5072 is an axial piston variable displacement pump with adjustable displacement. During commissioning, set the compensator pressure value and flow characteristics according to the motor grader’s hydraulic system design. Perform initial settings under no-load conditions, then gradually increase load to target operating conditions with fine adjustments.

4. Initial Start-Up & Priming: Before first start-up, pre-lubricate the pump by filling the housing with clean hydraulic fluid through the case drain port. Perform a brief jog start (5–10 seconds) to check for abnormal noise, leakage, or excessive vibration. Then正式 start the pump and run at low load for several minutes to purge air from the pump and system lines.

5. Case Drain Port Positioning & Pressure Monitoring: During installation, ensure the drain port is positioned higher than the pump body to prevent oil starvation in the pump chamber after shutdown. Install a pressure gauge on the case drain line for real-time monitoring to ensure case pressure remains within specifications.

6. Scheduled Maintenance & Filter Replacement: Follow the maintenance intervals specified in the Caterpillar 140G Service Manual. Pay particular attention to filter condition, fluid cleanliness, and seal integrity during routine inspections. Regular hydraulic fluid and filter replacement is essential for long-term reliable pump operation.