Product Overview
The AR22-FR01B-22 and AR22-FR01C-22 are the 22 cc-class models within the Yuken AR series of variable displacement axial piston pumps. Developed based on Yuken’s proven “A” series technology and engineering, the AR series is renowned for quiet operation and high efficiency. The AR series features a swashplate platform supported by a semi-cylindrical metal bearing, effectively reducing vibration and noise. Pump flow is proportional to drive speed and displacement, with displacement automatically adjusted via a pressure compensator for industrial hydraulic applications.
Model Code Breakdown (for procurement and engineering reference):
AR22: AR series, geometric displacement 22.2 cm³/rev (AR16 is 15.8 cm³/rev)
-F: Flange mounting type
R: Clockwise rotation (viewed from shaft end). Counterclockwise (L) has been discontinued
01: Pressure compensator control type
B: Pressure adjustment range 1.2–7 MPa (approx. 170–1020 psi)
C: Pressure adjustment range 2.0–16 MPa (approx. 290–2320 psi)
-22: Design number 22
The key difference between AR22-FR01B-22 and AR22-FR01C-22 is the pressure adjustment range: the B type covers 1.2–7 MPa, while the C type covers 2.0–16 MPa. Selection must be based on actual system working pressure requirements to avoid insufficient control precision.
About the Housing Material Upgrade: Yuken has changed the AR series pump body material from aluminum alloy to cast iron, increasing mass from 9.8 kg to 12.1 kg. Aside from the mass change, dimensions and performance remain unchanged with full interchangeability. The cast-iron housing offers higher structural rigidity and damping characteristics compared to aluminum, providing superior vibration suppression under high-pressure conditions.
Drop-in Replacement Advantage: Manufactured to exact Yuken OEM specifications, these pumps achieve complete drop-in interchangeability for flange mounting dimensions, shaft specification, port layout, and pressure compensator control interface. Every pump undergoes 100% simulated load testing prior to shipment, validating pressure compensator response, volumetric efficiency, and thermal stability under conditions replicating real-world duty cycles.
Technical Specifications
Model AR22-FR01B-22:
Model Code: AR22-FR01B-22
Series: Yuken AR Series (Variable Axial Piston Pump)
Geometric Displacement: 22.2 cm³/rev
Minimum Adjustable Flow: 8.5 cm³/rev
Rated Operating Pressure: 16 MPa (160 bar)
Pressure Adjustment Range: 1.2–7 MPa (B code)
Maximum Speed: 1800 r/min
Minimum Speed: 600 r/min
Theoretical Flow at 1800 rpm: Approx. 40 L/min
Control Type: Pressure Compensator Type (01 code)
Mounting: Flange Mounting (F code)
Rotation: Clockwise (viewed from shaft end)
Shaft: Straight shaft with key
Port Position: Axial ports (no code designation)
Housing Material: Cast Iron
Seal Material: NBR (nitrile), suitable for mineral oil-based fluids
Mass: Approx. 12.1 kg
Fluid Viscosity Range: 20–400 cSt (temperature 0–60°C)
Recommended Fluid: ISO VG 32 or 46 anti-wear hydraulic oil
Fluid Cleanliness: NAS Grade 10 or better
Model AR22-FR01C-22:
Model Code: AR22-FR01C-22
Series: Yuken AR Series (Variable Axial Piston Pump)
Geometric Displacement: 22.2 cm³/rev
Minimum Adjustable Flow: 8.5 cm³/rev
Rated Operating Pressure: 16 MPa (160 bar)
Pressure Adjustment Range: 2.0–16 MPa (C code)
Maximum Speed: 1800 r/min
Minimum Speed: 600 r/min
Theoretical Flow at 1800 rpm: Approx. 40 L/min
Control Type: Pressure Compensator Type (01 code)
Mounting: Flange Mounting (F code)
Rotation: Clockwise (viewed from shaft end)
Shaft: Straight shaft with key
Port Position: Axial ports (no code designation)
Housing Material: Cast Iron
Seal Material: NBR (nitrile), suitable for mineral oil-based fluids
Mass: Approx. 12.1 kg
Fluid Viscosity Range: 20–400 cSt (temperature 0–60°C)
Recommended Fluid: ISO VG 32 or 46 anti-wear hydraulic oil
Fluid Cleanliness: NAS Grade 10 or better
AR Series Displacement Size Reference:
AR10: Displacement approx. 10 cm³/rev, flange mounting type
AR16-FR01**-22: Displacement 15.8 cm³/rev, minimum adjustable flow 6.0 cm³/rev
AR22-FR01**-22: Displacement 22.2 cm³/rev, minimum adjustable flow 8.5 cm³/rev
Key Technical Advantages
1. Semi-Cylindrical Swashplate Bearing Support with Low Noise Design
The AR series employs a semi-cylindrical swashplate bearing structure where the swashplate is supported by a metal bearing, effectively reducing vibration and noise compared to conventional designs. The AR series noise level is 1–2 dB(A) lower than the already-quiet A series pump at full flow and full cut-off. This characteristic makes AR22 series pumps particularly suitable for machine tools and industrial equipment applications with strict noise control requirements.
2. Pressure Compensator Control with Automatic Displacement Adjustment
Both AR22-FR01B-22 and AR22-FR01C-22 are equipped with a pressure compensator (Pressure Compensator Type). When system pressure reaches the setpoint, the compensator automatically reduces pump displacement, maintaining only leakage compensation flow to minimize heat generation and power loss. The B type adjustment range is 1.2–7 MPa, and the C type is 2.0–16 MPa, precisely settable via the adjustment screw. The pressure compensator’s response time and overshoot are optimized to ensure stable and precise system pressure control.
3. Cast-Iron Housing Upgrade with High Structural Rigidity
Yuken has changed the AR series pump body material from aluminum alloy to cast iron, increasing housing mass from 9.8 kg to 12.1 kg. Cast iron has a higher elastic modulus and damping coefficient compared to aluminum, effectively suppressing structural vibration and fluid-borne noise at the 16 MPa rated pressure. Cast iron’s lower thermal expansion coefficient helps maintain stable clearances in internal running pairs, extending service life.
4. Compact Lightweight Design with High Power-to-Mass Ratio
The AR series was developed based on Yuken’s “A” series platform, achieving a high power-to-mass ratio while maintaining a compact design. The AR22 achieves a geometric displacement of 22.2 cm³/rev with a total pump mass of only approximately 12.1 kg, leading its displacement class in power density. The compact axial dimensions make the AR22 series particularly suitable for space-constrained industrial hydraulic systems. AR series main internal components (AR16/AR22) are shared, with extensive application track record and reliability validation.
5. Short Control Response Time with Stable Flow Output
The AR series pressure compensator control mechanism features short response times, with control spool and servo piston area ratios and spring rates precisely matched. Under load transient conditions, the pump completes displacement adjustment quickly, maintaining stable system flow and pressure output. In machine tool and injection molding applications requiring hydraulic response speed, this characteristic directly impacts machining precision and production efficiency.
Application Areas
Machine Tools: Hydraulic fixtures, hydraulic chucks, CNC machine hydraulic power units, precision grinder hydraulic systems (AR series is primarily used for machine tools and general industrial machinery)
Injection Molding Machines: Small to medium-tonnage injection molding machine clamp and injection hydraulic systems
Forging Equipment: Small hydraulic presses, bending machines, shearing machine hydraulic power sources
Industrial Automation: Hydraulic actuators, automated production line hydraulic systems
Test Equipment: Hydraulic test benches, fatigue testing machine auxiliary hydraulic power sources
Packaging Machinery: Hydraulic stamping packaging machines, automated packaging line hydraulic drives
General Industrial Hydraulic Power Units: Small to medium hydraulic power units, central oil supply systems
Expert Maintenance Tips
1. Hydraulic Fluid Cleanliness
AR series pumps are sensitive to fluid contamination. System fluid cleanliness must be maintained at NAS Grade 10 or better. The return line must have a line-type filter of 10 μm or under, or an offline/independent filtration unit should be installed in the system. Recommended fluids are ISO VG 32 or 46 anti-wear hydraulic oils or R&O type hydraulic oils with a viscosity range of 20–400 cSt (temperature 0–60°C). Replace filter elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.
2. Case Drain Line Requirements
The case drain line must be installed independently per specification, ensuring pump housing pressure is maintained below 0.1 MPa (normal) and surge pressure below 0.5 MPa. The drain line length must be less than 1 m, and the pipe end must be submerged in oil to prevent air ingestion. The drain line must return directly to the reservoir — never tie it into the main system return line. The drain fitting screw-in torque for AR16/AR22 pumps is 40–50 N·m. Do not apply bending or thrust torque to the fitting.
3. Installation Alignment and Coupling Requirements
Drive shaft alignment must be precisely maintained during installation. Employ a flexible coupling whenever possible, avoiding bending or thrust stress. Maximum permissible misalignment is less than 0.1 mm TIR and maximum permissible misangularity is less than 0.2°. Permissible suction pressure at the inlet port is between -0.16 and +0.5 kgf/cm². The pump suction port height must be within one meter from the oil level in the reservoir. When installing the pump, the filling port should be positioned upwards.
4. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the filling port, taking care to prevent foreign matter ingress. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Start at low speed with zero load and run for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load. An air bleed valve (Model No. ST1004-*-10*) is recommended for bleeding air from the pump case and outlet line to eliminate vibration sources.
5. Pressure Compensator Setting and Adjustment
The AR22-FR01B-22 pressure adjustment range is 1.2–7 MPa, and the AR22-FR01C-22 is 2.0–16 MPa. When setting pressure, ensure the full cut-off pressure does not exceed the 16 MPa maximum operating pressure. Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding. Never adjust the compensator while the system is under pressure. A pressure relief valve (recommended setting at 1.1 times the rated value) should be installed on the discharge line to prevent system overpressure.
