“ARL1” Series Variable Displacement Piston Pumps

1. Model Specifications and Composition

1.1 Model Composition Explanation

• ARL1: Series number, indicating the ARL1 series variable displacement piston pump.
• 6: Nominal displacement, corresponding to 6.2 cm³/rev (other models: 8 for 8.5 cm³/rev, 12 for 12.3 cm³/rev, 16 for 16.3 cm³/rev).
• F: Mounting type, F for flange mounting type, L for foot mounting type (note: foot mounting type can only choose side port type).
• R: Rotation direction, R for clockwise (viewed from the shaft end).
• 01: Control method, 01 for pressure compensator control.
• S: Port direction, S for side port (standard type), A for downward suction port.
• 10: Design number, fixed as 10 for standard models.

1.2 Main Models

• ARL1-6-※R01※-10
• ARL1-8-※R01※-10
• ARL1-12-※R01※-10
• ARL1-16-※R01※-10

2. Key Technical Parameters

2.1 Additional Key Parameters

• Hydraulic Oil Requirement: Clean petroleum-based hydraulic oil equivalent to ISO VG32 or 46, with a viscosity range of 20~400 mm²/s and an operating temperature range of 0~60℃.
• Suction Pressure: The allowable suction pressure at the pump inlet is -16.7~+50 kPa; the height of the suction port shall not exceed 1 meter from the oil level in the tank.
• Noise Level: Under the conditions of 7 MPa pressure, 1500 r/min speed and 1 meter measurement distance, the noise level at full cut-off is 55 dB(A) (representative value of ARL1-16).
• Pressure Adjustment: The pressure is set to the minimum when leaving the factory; turning the pressure adjustment screw clockwise increases the pressure, with an adjustment amount of 1.5 MPa per full rotation of the screw.
• Drainage Requirements: The steady-state pressure in the housing shall not exceed 0.1 MPa, and the shock pressure shall not exceed 0.5 MPa; the length of the drainage pipeline shall not exceed 1 meter, and it shall be independently connected without merging with other return lines.

3. Product Features

• Low Noise and High Reliability: Backed by years of piston pump manufacturing experience, the pump has excellent noise reduction performance and high operational reliability, which can ensure stable operation in long-term work.
• Compact and Lightweight: Compared with the AR series variable displacement piston pumps, the weight and volume are both reduced by 40%, which is very suitable for occasions with limited installation space.
• Small Displacement Design: Covering the small displacement range of 6.2~16.3 cm³/rev, it is specially designed for small-displacement hydraulic systems and meets the needs of low-flow and stable pressure supply.
• Standard Pressure Compensator Control: Equipped with a standard pressure compensator control mode, which can automatically adjust the output according to the system pressure demand, ensuring the stability of the hydraulic system.

4. Usage Precautions

• Oil Pollution Control: The pollution of hydraulic oil will cause pump failure and shorten its service life. The oil pollution degree should be kept within NAS 10 level; a filter with at least 100 μm (150 mesh) should be installed on the suction side, and a filter with no more than 10 μm should be installed on the return line.
• Installation Posture: When installing the pump, the oil filling port must face upward to ensure normal oil filling and exhaust.
• Shaft Alignment: A flexible coupling should be used as much as possible for shaft connection to avoid bending load and thrust load on the shaft; the total indicator reading (TIR) of the coaxiality deviation shall not exceed 0.1 mm, and the angle deviation shall not exceed 0.2°.
• Piping Requirements: When using steel pipes for piping, avoid excessive load on the pump from the pipeline; if there is a risk of excessive load, use rubber hoses. The suction pipeline and suction filter should not be higher than the pump port to prevent air accumulation.
• Air Bleeding: Air mixed in the pump and pipeline will cause vibration; it is recommended to install an air bleed valve on the discharge side to ensure complete air bleeding before operation.
• Start-up Notes: Before initial operation, inject 285 cm³ of clean hydraulic oil into the pump through the oil filling port; during start-up, adjust the hydraulic circuit to make the pump discharge oil flow back directly to the tank, avoiding no-load operation of the actuator.
• Displacement Adjustment: This pump is not equipped with a displacement adjustment function; a flow control valve should be installed if displacement adjustment is needed according to the use requirements.