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DAIKIN variable piston Pump V70 series manual

Опубликовано: 2026-04-21 11:35:13　Просмотр: 4

Daikin hydraulic pumps

1. General Introduction

The DAIKIN V70 Series variable piston pump is a high-performance hydraulic component belonging to the V Series piston pumps, specifically designed for industrial and mobile machinery hydraulic power systems. With a displacement of up to 69.8 cm³/rev, this series features low noise, high efficiency, and high reliability, making it suitable for open-loop circuits requiring adjustable or regulated flow delivery. It is widely applied in hydraulic presses, robots, automation equipment, construction and mining machinery, as well as machine tools such as lathes and milling machines.

This manual provides detailed information on the specifications, installation, operation, maintenance, and safety precautions of the V70 Series variable piston pump. Strictly following the guidelines in this manual is essential to ensure the pump's stable operation, extend its service life, and avoid equipment damage or personal injury.

2. Technical Specifications

Item	Specification
Model Series	V70 Series Variable Piston Pump
Theoretical Discharge Rate	69.8 cm³/rev
Maximum Operating Pressure	21 MPa {210 kgf/cm²}
Permissible Rotational Speed	500 to 1800 min⁻¹
Discharge Rate Adjustment Range (at 1800 min⁻¹)	13 to 126 L/min (axial port and side port)
Mass (Control Method A, Side Port)	55 kg
Applicable Fluid	Petroleum-based hydraulic fluid (no designation); Water-glycol hydraulic fluid (code W); Phosphate ester hydraulic fluid (code F)
Direction of Rotation (Viewed from Shaft End)	Clockwise (R) or Counterclockwise (L)
Piping Direction	Side port (code X); Axial port (optional)
Design Number	60 (subject to change)

3. Product Features

3.1 Low Noise

Low noise operation is realized over the entire pressure range, which helps reduce noise pollution in the working environment and improve operator comfort. This feature is achieved through optimized structural design and precision manufacturing工艺 [process].

3.2 High Efficiency

The pump has small power loss, which can effectively reduce fluid temperature rise. This not only ensures stable operation of the hydraulic system but also allows for a smaller design of the hydraulic tank, saving installation space and reducing overall system costs.

3.3 High Reliability

With high responsivity, high stability, and long service life, the V70 Series pump can significantly improve the reliability of the main machine it is installed on. Its robust structure and high-quality components ensure stable operation even in harsh working conditions such as high pressure and frequent load changes.

3.4 Flexible Control Options

The series offers a variety of control methods to meet different application needs, including: Pressure Compensator Control (A), Remote Pressure Compensator Control (A-RC), Dual Pressure Compensator Control (D), Combined Flow and Pressure Compensator Control (SA), Combined Pressure and Displacement Control with System Pressure (CH), and Combined Pressure and Displacement Control with Solenoid Valve (CJ).

4. Model Code Interpretation

The model code of the V70 Series pump contains key information about its specifications and configuration. The following is a typical interpretation (taking V70A3RX-60 as an example):

V: Series identifier (V Series variable piston pump)
70: Pump capacity (69.8 cm³/rev)
A: Control method (Pressure Compensator Control)
3: Pressure adjustment range (3.5 to 21 MPa {35 to 210 kgf/cm²})
R: Direction of rotation (Clockwise, viewed from the shaft end)
X: Piping direction (Side port)
60: Design number (subject to change)

5. Installation Instructions

5.1 Installation Environment

Install the pump in a clean, dry, and well-ventilated environment, away from high-temperature heat sources and corrosive substances.
Ensure the installation location has sufficient space for operation, maintenance, and disassembly of the pump.
The ambient temperature should be within the range suitable for the hydraulic fluid used; if working in extreme temperatures, a cooling or heating system should be equipped to maintain the fluid temperature within the appropriate range.

5.2 Installation Steps

Fix the pump firmly on the mounting base using bolts that meet the specified specifications. Ensure the mounting surface is flat and clean to avoid vibration during operation.
Align the pump shaft with the drive motor shaft accurately. The coaxiality error should not exceed the specified value to prevent shaft wear and vibration.
Connect the suction and discharge pipes according to the piping direction (axial port or side port). Ensure the pipes are clean, free of debris, and tightly connected to avoid oil leakage. The suction pipe should be as short and straight as possible to reduce suction resistance.
Fill the pump and hydraulic system with the recommended hydraulic fluid. The fluid level should meet the requirements of the system, and the fluid should be filtered to remove impurities before filling.
Check the rotation direction of the pump. Before formal operation, manually rotate the pump shaft to ensure it rotates flexibly without jamming. Then, test-run the motor briefly to confirm that the pump rotation direction is consistent with the specified direction (R or L).

6. Operation Guide

6.1 Pre-Operation Check

Check the hydraulic fluid level and quality. If the fluid level is too low, add the recommended hydraulic fluid; if the fluid is contaminated or deteriorated, replace it immediately.
Check all pipe connections for oil leakage. Tighten any loose connections.
Check the pressure gauge, flow meter, and other instruments to ensure they are accurate and in normal working condition.
Check the control system (such as pressure adjustment valves) to ensure it is set correctly and operates flexibly.

6.2 Start-Up Operation

Start the drive motor at low speed and let the pump run idly for 2 to 3 minutes. During idling, observe whether the pump operates smoothly, whether there is abnormal noise or vibration, and whether there is oil leakage.
Gradually increase the motor speed to the rated speed and adjust the system pressure to the working pressure according to the application requirements. The pressure adjustment should be carried out slowly to avoid sudden pressure surges that may damage the pump and system components.
After the pump runs stably, check the discharge flow and pressure to ensure they meet the design requirements. Monitor the fluid temperature; if the temperature exceeds the limit, stop the pump and check the cooling system or other potential problems.

6.3 Normal Operation Precautions

During operation, always monitor the pump's operating status, including noise, vibration, fluid temperature, and pressure. If any abnormal phenomenon is found, stop the pump immediately for inspection and troubleshooting.
Do not exceed the maximum operating pressure and rotational speed of the pump to avoid reducing the pump's service life or causing equipment failure.
The discharge rate can be adjusted according to the system needs through the control mechanism, but the adjustment should be smooth and avoid sudden changes in flow rate.
Ensure the hydraulic fluid is kept clean. Regularly check the filter and replace the filter element when it is clogged or damaged.

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