YUKEN A7H、ARL1 Piston Pump
1. YUKEN A7H Series High-Pressure Variable Displacement Piston Pumps
1.1 Overview
The YUKEN A7H series is a high-pressure variable displacement piston pump developed by YUKEN Industrial Co., Ltd., as an expansion of the high-pressure variable pump lineup following the A3H series. It is designed to meet the requirements of high-pressure and large-flow hydraulic systems, featuring excellent stability and adaptability, and is widely used in various industrial machinery and hydraulic equipment.
1.2 Key Features
- High Pressure & Large Displacement: It achieves a rated pressure of 35 MPa and a maximum pressure of 40 MPa, with available theoretical displacements of 180 cm³/rev and 270 cm³/rev, effectively meeting the demand for high-pressure and large-flow applications.
- Compatible with Combined Pumps: The non-drive side adopts SAE standard mounting, allowing additional pumps to be connected to realize pump compounding, which enhances the flexibility of system configuration.
- Fire-Resistant Hydraulic Fluid Compatible: Under certain conditions, it can use water-glycol and fatty acid ester-based fire-resistant hydraulic fluids, expanding its application scope in special working environments.
- Multiple Control Modes: It offers various control modes, including pressure compensator control (model suffix R01S), constant power control (model suffix R09S), and external-mounted constant power control (model suffix R09RS), to adapt to different system working requirements.
1.3 Main Specifications
| Model No. | Theoretical Displacement (cm³/rev) | Rated Pressure (MPa) | Maximum Pressure (MPa) | Rated Speed (r/min) | Maximum Speed (r/min) | Temperature Range (℃) | Viscosity Range (mm²/s) |
|---|---|---|---|---|---|---|---|
| A7H180 | 180 | 35 | 40 | 1200 | 1600 | -20~80 | 10~200 (200~1000)* |
| A7H265 (A7H270) | 270 | 35 | 40 | 1800 | 1900 | -20~80 | 10~200 (200~1000)* |
*Note: When the viscosity exceeds 200 mm²/s, pre-warming operation is required before formal operation.
1.4 Model Designation
Example: M-A7H265-FR01SN A-10
- M: Water-glycol-based hydraulic fluid (No mark: mineral oil; P: fatty acid ester-based)
- A7H265: Series and displacement (A7H265=270 cm³/rev; A7H180=180 cm³/rev)
- F: Flange mounting (L: foot mounting)
- R: Rotation direction (clockwise when viewed from the shaft end)
- 01: Control mode (01=pressure compensator control; 09=constant power control; 09R=external-mounted constant power control)
- S: Port direction (side port, standard)
- N: No auxiliary device (no mark: no auxiliary device)
- A: Mounting type (SAE A mounting; B: SAE B; C: SAE C; D: SAE D; CC: SAE CC)
- 10: Design number
2. YUKEN ARL1 Series Variable Displacement Piston Pumps
2.1 Overview
The YUKEN ARL1 series is a compact, low-noise, and high-efficiency pressure compensator type variable displacement piston pump. Based on the mature technology and high reliability of YUKEN’s A series and AR series piston pumps, it covers a small displacement range and is suitable for hydraulic systems requiring compact installation space and low noise operation.
2.2 Key Features
- Compact and Lightweight: Compared with YUKEN’s AR series piston pumps, its weight and volume are reduced by 40%, making it easy to install in limited space.
- Low Noise: The noise level is as low as 55 dB(A) (representative value of ARL1-16) when measured 1 meter behind the pump at 7 MPa and 1500 r/min, effectively reducing environmental noise pollution.
- High Reliability: It inherits YUKEN’s years of piston pump manufacturing experience, with stable performance and long service life, ensuring continuous and reliable operation of the hydraulic system.
- Pressure Compensator Control: It adopts pressure compensator control (model suffix R01), which can automatically adjust the displacement according to the system pressure, achieving energy-saving operation.
2.3 Main Specifications
| Model No. | Theoretical Displacement (cm³/rev) | Minimum Adjustment Pressure (MPa) | Maximum Working Pressure (MPa) | Rated Speed (r/min) | Maximum Speed (r/min) | Weight (kg) |
|---|---|---|---|---|---|---|
| ARL1-6-※R01※-10 | 6.2 | 1.2 | 7 | 1800 | 600 | 6.8 |
| ARL1-8-※R01※-10 | 8.5 | 1.2 | 7 | 1800 | 600 | 9.0 |
| ARL1-12-※R01※-10 | 12.3 | 1.2 | 7 | 1800 | 600 | – |
| ARL1-16-※R01※-10 | 16.3 | 1.2 | 7 | 1800 | 600 | – |
2.4 Model Designation
Example: ARL1-6-FR01S-10
- ARL1: Series name (variable displacement piston pump)
- 6: Nominal displacement (6=6.2 cm³/rev; 8=8.5 cm³/rev; 12=12.3 cm³/rev; 16=16.3 cm³/rev)
- F: Flange mounting (L: foot mounting; note: foot mounting only supports side port type)
- R: Rotation direction (clockwise when viewed from the shaft end)
- 01: Control mode (01=pressure compensator control)
- S: Port direction (side port, standard; A: suction port downward)
- 10: Design number
2.5 Notes on Use
- Air Bleeding: Ensure complete air bleeding from the pump interior and pipeline to avoid vibration; it is recommended to install an air release valve on the discharge side.
- Start-up Preparation: Inject 285 cm³ of clean hydraulic oil through the oil filler before initial operation; adjust the hydraulic circuit to ensure the pump discharge oil returns directly to the tank or the actuator moves without load at startup to avoid cavitation.
- Pressure Adjustment: The pump is set to the minimum pressure at the factory; adjust the pressure by turning the pressure adjustment screw (clockwise to increase pressure), with an adjustment amount of 1.5 MPa per full rotation of the screw; tighten the lock nut after adjustment.
- Displacement Adjustment: The pump does not have a built-in displacement adjustment function; install a flow control valve if necessary.
3. General Reminder
All specifications and parameters are based on YUKEN’s official standards; for detailed dimensions, performance curves, and installation drawings, refer to the official product catalog or contact YUKEN Industrial Co., Ltd. (website: www.yuken.co.jp) for more information. Ensure the pump is used within the specified working conditions to extend its service life and ensure stable operation. The performance data in this description is based on ISO VG32 hydraulic oil at 40℃ unless otherwise specified.
