Hitachi ZX30/35 Small Pump P/N: PVD-1B-31CP

5 month ago

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4 year

Product details

I. Product Overview

ThePVD-1B-31CPis a hydraulic variable displacement piston pump used in Hitachi’sZX30 and ZX35 series compact excavators. It supplies high-pressure hydraulic fluid to power the machine’s travel, swing, boom, arm, and bucket movements.

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II. Technical Specifications

• Model: PVD-1B-31CP

• Type: Variable Displacement Piston Pump

• Application: Hitachi ZX30, ZX35 Compact Excavators

• Pressure Range:

• Rated Pressure:21 MPa (3,045 PSI)

• Maximum Pressure:31.5 MPa (4,568 PSI)

• Displacement: Approx.31 cm³/rev(may vary slightly by design)

• Speed Range:

• Rated Speed:2,200–2,500 rpm

• Maximum Speed:3,000 rpm

• Control Method: Pressure compensation or load-sensing control (system-dependent)

• Weight: Approx.25–30 kg(including pump body and mounting accessories)

• Mounting Interface: Compatible with Hitachi excavator hydraulic system standards.

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III. Key Features

1. Variable Output:

• Automatically adjusts displacement based on load demand for energy efficiency.

• Reduces displacement under light loads to save energy; increases it under heavy loads for power.

2. High-Pressure Supply:

• Provides up to31.5 MPato meet demanding tasks like digging and breaking.

3. Stability:

• Precision-engineered pistons and swashplate ensure smooth hydraulic fluid delivery, minimizing vibration and noise.

4. Durability:

• High-strength materials for critical components (pistons, cylinder block, bearings) to withstand harsh conditions.

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IV. Applications

• Primary Use:

• Core power unit for Hitachi ZX30/35 excavators, driving travel, swing, and working attachments (boom, arm, bucket).

• Other Compatible Equipment:

• Some other brands’3–5-ton compact excavators(interface and parameter compatibility required).

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V. Common Issues & Maintenance

1. Symptoms of Failure:

• Weak hydraulic system or slow operation → Possible internal wear or leakage.

• Abnormal noise → Damaged bearings or contaminated hydraulic fluid.

• Overheating → Reduced pump efficiency or cooling system failure.

2. Maintenance Recommendations:

• Regular Oil Changes: Replace hydraulic fluid every2,000 hoursor as recommended by the manufacturer.

• Seal Inspection: Check pump seals periodically to prevent leaks.

• Filter Cleaning: Keep hydraulic filters clean to avoid contaminants entering the pump.

• Professional Repairs: For disassembly/repair, contact Hitachi-authorized service centers using genuine parts.

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