Caterpillar 301.7 Hydraulic Pump

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

4 year

Product details

Caterpillar 301.7 Hydraulic Pump

Applicable Model: Cat 301.7 CR / 301.7D CR Mini Excavator

OEM Part Numbers: 399-2947, 399-3051

1. Core Technical Parameters

- Structure Type: Variable Displacement Axial Piston Pump (Load Sensing)

- Rated Drive Speed: 2400 rpm

- Rated Flow Rate: 66 L/min (17.4 gpm)

- System Pressure:

- Main Circuit / Travel / Working Device: 245 bar (3553 psi)

- Swing Circuit: 147 bar (2132 psi)

- Auxiliary Circuit Flow: 14 L/min (3.7 gpm)

2. Hydraulic System Features

- Equipped with load sensing (LS) function to adjust flow on demand, reducing fuel consumption and heat generation.

- Compact structure, perfectly matching the short-radius (CR) narrow body of Cat 301.7.

- High-strength wear-resistant alloy housing, fitted with precision valve plate, hardened piston assemblies and heavy-duty bearings.

- Standard SAE flange and spline shaft for direct replacement installation.

3. Application & Replacement Options

- Genuine Parts: 399-2947, 399-3051 (Made in Japan)

- Alternative Brands: Equivalent variable displacement piston pumps from NACHI, Rexroth

- Matching Engine: C1.1 Engine (15.7 kW / 21 hp)

4. Common Faults & Maintenance Guidelines

Common Malfunctions

- Insufficient pressure: Stuck LS valve, worn pistons, scratched valve plate

- Abnormal noise & vibration: Damaged bearings, insufficient oil suction, contaminated hydraulic fluid

Maintenance Tips

- Recommended hydraulic oil: ISO VG46, replace every 500 operating hours

- Replace hydraulic filters simultaneously to avoid component wear caused by particle impurities

- Regularly inspect oil leakage at shaft seals, flange surfaces and pipe joints

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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

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